diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb2d..7fc3c5f209a 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,4 @@
+- bump: patch
+  changes:
+    changed:
+      - Update Colorado income tax parameters for tax year 2025.
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/agi_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/agi_threshold.yaml
index cd31f568a27..f8a5db05162 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/agi_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/agi_threshold.yaml
@@ -15,6 +15,8 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=9
   - title: Individual Income Tax Guide - Part 3 Additions to Taxable Income - Federal itemized or standard deductions
     href: https://tax.colorado.gov/individual-income-tax-guide
+  - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Additions Line 4
+    href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=9
 values:
   2022-01-01: 400_000
   2023-01-01: 300_000
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/exemption.yaml b/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/exemption.yaml
index 30dec388fbc..5d08f31df01 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/exemption.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/exemption.yaml
@@ -15,6 +15,8 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=9
   - title: Individual Income Tax Guide - Part 3 Additions to Taxable Income - Federal itemized or standard deductions
     href: https://tax.colorado.gov/individual-income-tax-guide
+  - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Additions Line 4
+    href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=9
   breakdown:
     - filing_status
 JOINT:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/itemized_only.yaml b/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/itemized_only.yaml
index cc73eae4acb..4bc007db0b3 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/itemized_only.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/additions/federal_deductions/itemized_only.yaml
@@ -15,6 +15,8 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=9
   - title: Individual Income Tax Guide - Part 3 Additions to Taxable Income - Federal itemized or standard deductions
     href: https://tax.colorado.gov/individual-income-tax-guide
+  - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Additions Line 4
+    href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=9
 values:
   2022-01-01: true
   2023-01-01: false
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/additions/qualified_business_income_deduction/agi_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/additions/qualified_business_income_deduction/agi_threshold.yaml
index 9a6d016ee89..c4563929573 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/additions/qualified_business_income_deduction/agi_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/additions/qualified_business_income_deduction/agi_threshold.yaml
@@ -14,8 +14,10 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=5
   - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book - Additions - Line 3
     href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=9
-  - title: Individual Income Tax Guide - Part 3 Additions to Taxable Income 
+  - title: Individual Income Tax Guide - Part 3 Additions to Taxable Income
     href: https://tax.colorado.gov/individual-income-tax-guide
+  - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Additions Line 3
+    href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=9
   breakdown:
     - filing_status
 
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/joint.yaml
index 0f3d29eec6f..7ac637f4965 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/joint.yaml
@@ -8,3 +8,5 @@ metadata:
   reference:
     - title: Colorado Revised Statutes Section 39-22-566 (3)(a)
       href: https://law.justia.com/codes/colorado/title-39/specific-taxes/income-tax/article-22/part-5/section-39-22-566/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=30
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/non_joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/non_joint.yaml
index 6490a97263f..d61d4dfedd9 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/non_joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/amount/non_joint.yaml
@@ -8,3 +8,5 @@ metadata:
   reference:
     - title: Colorado Revised Statutes Section 39-22-566 (3)(a)
       href: https://law.justia.com/codes/colorado/title-39/specific-taxes/income-tax/article-22/part-5/section-39-22-566/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=30
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/joint.yaml
index 2320c0eef83..7a55cdf6dfd 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/joint.yaml
@@ -8,3 +8,5 @@ metadata:
   reference:
     - title: Colorado Revised Statutes Section 39-22-566 (3)(b)(I)(B)
       href: https://law.justia.com/codes/colorado/title-39/specific-taxes/income-tax/article-22/part-5/section-39-22-566/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=30
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/non_joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/non_joint.yaml
index ad3af1c85d1..bf17d1f97c5 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/non_joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/care_worker/income_limit/non_joint.yaml
@@ -8,3 +8,5 @@ metadata:
   reference:
     - title: Colorado Revised Statutes Section 39-22-566 (3)(b)(I)(A)
       href: https://law.justia.com/codes/colorado/title-39/specific-taxes/income-tax/article-22/part-5/section-39-22-566/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=30
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/child_age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/child_age_threshold.yaml
index 42dad449e66..ac1626a6bd1 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/child_age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/child_age_threshold.yaml
@@ -13,6 +13,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=48
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, page 67, Eligible, 4, b
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=67
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, page 67, Eligible, 4, b
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=67
 
   unit: year
   period: year
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/federal_agi_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/federal_agi_threshold.yaml
index 8111766e0b1..26a059ba7c6 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/federal_agi_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/federal_agi_threshold.yaml
@@ -13,6 +13,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=48
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=68
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Part IV
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=68
 
   unit: currency-USD
   period: year
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/max_amount.yaml
index 38154369212..b462b35208e 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/max_amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/max_amount.yaml
@@ -16,6 +16,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=50
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Table A
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=70
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Part IV Table A
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=70
 brackets:
   - threshold:
       2018-01-01: 0
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/rate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/rate.yaml
index 012ed410af7..17b8b22eaf4 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/rate.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/low_income/rate.yaml
@@ -14,5 +14,7 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=50
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part IV Line 10
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=70
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Part IV Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=70
 values:
   2018-01-01: 0.25
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/match.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/match.yaml
index 4b62c30fe00..50fec0e2c4c 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/match.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/cdcc/match.yaml
@@ -14,6 +14,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=50
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book, Part III Line 7
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=70
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Part III Line 7
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=70
 
 brackets:
   - threshold:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
index 0f9b5246163..53debfda7bf 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/age_threshold.yaml
@@ -21,4 +21,6 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=1
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/head_of_household.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/head_of_household.yaml
index 4c1ce14a5df..2c6fc838093 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/head_of_household.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/head_of_household.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:
   - threshold:
       2024-01-01: -.inf
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/joint.yaml
index d9c38f2ddc6..79ddf288d6e 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/joint.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=6
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:
   - threshold:
       2024-01-01: -.inf
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/separate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/separate.yaml
index f48bd45a368..722fbaa4234 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/separate.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/separate.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:
   - threshold:
       2024-01-01: -.inf
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/single.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/single.yaml
index a40b7ac7273..5fa6ac473de 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/single.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/single.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:
   - threshold:
       2024-01-01: -.inf
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/surviving_spouse.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/surviving_spouse.yaml
index e9fda9b91cc..1d32f808f54 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/surviving_spouse.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/amount/surviving_spouse.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
     - title: 2024 Colorado Child Tax Credit Instructions, Section B
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section B
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 brackets:
   - threshold:
       2024-01-01: -.inf
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/ctc_matched_federal_credit.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/ctc_matched_federal_credit.yaml
index 91a2f2fa6a1..9a6e8face9a 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/ctc_matched_federal_credit.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/ctc_matched_federal_credit.yaml
@@ -8,6 +8,8 @@ metadata:
   # in the 2022 tax forms
     - title: House Bill 23-1112, Section 2, (3.5) / (4)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=5
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
 values:
   2022-01-01: true
   2024-01-01: false
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/eligible_child.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/eligible_child.yaml
index 45d015508e9..d341fdf1425 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/eligible_child.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/eligible_child.yaml
@@ -11,3 +11,5 @@ metadata:
   reference:
     - title: House Bill 23-1112, Section 2, (1), (a)
       href: https://leg.colorado.gov/sites/default/files/2023a_1112_signed.pdf#page=4
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/head_of_household.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/head_of_household.yaml
index 0b7c0a2b959..63c8f02ac7d 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/head_of_household.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/head_of_household.yaml
@@ -18,6 +18,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=6
     - title: 2021 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
 brackets:
   - threshold:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/joint.yaml
index da1bb30d2e6..dc68ea7ac8d 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/joint.yaml
@@ -18,6 +18,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=6
     - title: 2021 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
 brackets:
   - threshold:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/separate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/separate.yaml
index d7e29c77fb9..138ba571b13 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/separate.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/separate.yaml
@@ -18,6 +18,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=6
     - title: 2021 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
 brackets:
   - threshold:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/single.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/single.yaml
index b840396788d..08d94ad1f43 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/single.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/single.yaml
@@ -18,6 +18,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=6
     - title: 2021 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
 brackets:
   - threshold:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/surviving_spouse.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/surviving_spouse.yaml
index ea5c0198a79..11e640bdb99 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/surviving_spouse.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/ctc/rate/surviving_spouse.yaml
@@ -18,6 +18,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104CN_2023.pdf#page=6
     - title: 2021 Colorado Individual Income Tax Filing Guide
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104Book_2021_V3.pdf#page=15
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 1
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=26
       # Colorado introduced the child tax credit in 2022.
 brackets:
   - threshold:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/eitc/match.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/eitc/match.yaml
index b864d8cf7a4..6b70ba33f4e 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/eitc/match.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/eitc/match.yaml
@@ -8,13 +8,14 @@ values:
   # It also increases the amounts for 2025 and 2026
   # regardless of state revenue.
   # It can rise higher depending on state revenue.
-  2025-01-01: 0.35
+  # 2025 is 50% per Book 104.
+  2025-01-01: 0.5
   2026-01-01: 0.25
   2034-01-01: 0.10
 metadata:
   period: year
   unit: /1
-  label: Colorado EITC match 
+  label: Colorado EITC match
   reference:
     - title: C.R.S. 39-22-123.5
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=ad7daeaa-b9cd-4f50-9c62-7bddb226d77c&nodeid=ABPAACAACAABAACABH&nodepath=%2FROOT%2FABP%2FABPAAC%2FABPAACAAC%2FABPAACAACAAB%2FABPAACAACAABAAC%2FABPAACAACAABAACABH&level=6&haschildren=&populated=false&title=39-22-123.5.+Earned+income+tax+credit+-+legislative+declaration+-+repeal.&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&pddocfullpath=%2Fshared%2Fdocument%2Fstatutes-legislation%2Furn%3AcontentItem%3A6B7G-SG43-RTYH-3036-00008-00&ecomp=6gf59kk&prid=22d89c10-a7eb-48af-90ff-837a5559904e
@@ -24,8 +25,10 @@ metadata:
     - title: HB24-1134
       href: https://leg.colorado.gov/bills/hb24-1134
     - title: 2022 Colorado Individual Income Tax Filing Guide, Line 5
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=16 
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=16
     - title: 2023 Colorado Individual Tax Filing Guide 104 Book, Line 5
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=18
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book, Instructions for Select Credits from the DR 0104CR, Line 5
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=25
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 5
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=25
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/age_multiplier.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/age_multiplier.yaml
index 91ddce77165..aa1109c1a45 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/age_multiplier.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/age_multiplier.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 brackets:
   - threshold:
       2024-01-01: 0
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/amount.yaml
index 9209f673da9..3cbc6bc33a7 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/amount.yaml
@@ -1,6 +1,7 @@
 description: Colorado provides this family affordability tax credit base amount for each younger child.
 values:
   2024-01-01: 3_200
+  2025-01-01: 3_273
 metadata:
   period: year
   unit: currency-USD
@@ -10,3 +11,5 @@ metadata:
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/increment.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/increment.yaml
index c44c1a509ca..e3bba3460c8 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/increment.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/increment.yaml
@@ -13,6 +13,8 @@ metadata:
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 
 
 values:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/rate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/rate.yaml
index 61c63105797..3d019029ca2 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/rate.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/rate.yaml
@@ -7,6 +7,8 @@ metadata:
     - title: Colorado General Assembly House Bill 24-1311 Family Affordability Tax Credit
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
-      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3  
+      href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 values:
   2024-01-01: 0.06875
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/threshold.yaml
index 9c98dccbbca..0abef0fdc56 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/family_affordability/reduction/threshold.yaml
@@ -10,6 +10,8 @@ metadata:
       href: https://leg.colorado.gov/bills/hb24-1311
     - title: 2024 Colorado Child Tax Credit Instructions, Section C
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104CN_2024.pdf#page=3
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Section C
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=27
 SINGLE:
   values:
     2024-01-01: 15_000
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/age_limit.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/age_limit.yaml
index 1aff35eda73..2f40e2ff4d7 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/age_limit.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/age_limit.yaml
@@ -12,5 +12,7 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=28
     - title: 39-22-544 - Credit against tax - qualifying seniors (4) (a)
       href: https://casetext.com/statute/colorado-revised-statutes/title-39-taxation/specific-taxes/income-tax/article-22-income-tax/part-5-special-rules/section-39-22-544-credit-against-tax-qualifying-seniors-creation-legislative-declaration-definitions
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 6
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=28
 
 # Program only in effect for tax years 2022 and 2024
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/income_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/income_threshold.yaml
index 089183014d3..b2517e3d526 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/income_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/income_threshold.yaml
@@ -11,6 +11,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=28
     - title: 39-22-544 - Credit against tax - qualifying seniors (4) (a)
       href: https://casetext.com/statute/colorado-revised-statutes/title-39-taxation/specific-taxes/income-tax/article-22-income-tax/part-5-special-rules/section-39-22-544-credit-against-tax-qualifying-seniors-creation-legislative-declaration-definitions
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 6
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=28
 
 values:
   2022-01-01: 75_000
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/amount.yaml
index 8b2eab11fe9..c5a43047bad 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/amount.yaml
@@ -12,6 +12,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=28
     - title: C.R.S. 39-22-544 (4)
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=36044aec-3814-40aa-973a-a3c829f9fd0b&action=pawlinkdoc&pdcomponentid=&pddocfullpath=%2fshared%2fdocument%2fstatutes-legislation%2furn%3acontentItem%3a6633-05N3-GXF6-81C6-00008-00&pdtocnodeidentifier=ABPAACAACAABAAGACL&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&ecomp=k2vckkk&prid=0823b89b-e2f2-4942-affb-ba0d59f746b8
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 6
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=28
   breakdown:
     - filing_status
 
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/increment.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/increment.yaml
index 2fbd8dd4dcd..5f1809e5d8f 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/increment.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/increment.yaml
@@ -12,6 +12,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=28
     - title: C.R.S. 39-22-544 (4)
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=36044aec-3814-40aa-973a-a3c829f9fd0b&action=pawlinkdoc&pdcomponentid=&pddocfullpath=%2fshared%2fdocument%2fstatutes-legislation%2furn%3acontentItem%3a6633-05N3-GXF6-81C6-00008-00&pdtocnodeidentifier=ABPAACAACAABAAGACL&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&ecomp=k2vckkk&prid=0823b89b-e2f2-4942-affb-ba0d59f746b8
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 6
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=28
 values:
   2022-01-01: 500
   2023-01-01: 0
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/max_amount.yaml
index f0c2763590f..e2410960f15 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/max_amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/max_amount.yaml
@@ -14,7 +14,9 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=28
     - title: C.R.S. 39-22-544 (4)
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=36044aec-3814-40aa-973a-a3c829f9fd0b&action=pawlinkdoc&pdcomponentid=&pddocfullpath=%2fshared%2fdocument%2fstatutes-legislation%2furn%3acontentItem%3a6633-05N3-GXF6-81C6-00008-00&pdtocnodeidentifier=ABPAACAACAABAAGACL&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&ecomp=k2vckkk&prid=0823b89b-e2f2-4942-affb-ba0d59f746b8
-      
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 6
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=28
+
 SINGLE:
   2022-01-01: 1_000
   2023-01-01: 0
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/start.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/start.yaml
index 963b3196805..a9e03d81cd1 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/start.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/income_qualified_senior_housing/reduction/start.yaml
@@ -12,6 +12,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=28
     - title: C.R.S. 39-22-544 (4)
       href: https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=36044aec-3814-40aa-973a-a3c829f9fd0b&action=pawlinkdoc&pdcomponentid=&pddocfullpath=%2fshared%2fdocument%2fstatutes-legislation%2furn%3acontentItem%3a6633-05N3-GXF6-81C6-00008-00&pdtocnodeidentifier=ABPAACAACAABAAGACL&config=014FJAAyNGJkY2Y4Zi1mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFBvZENhdGFsb2d592qv2Kywlf8caKqYROP5&ecomp=k2vckkk&prid=0823b89b-e2f2-4942-affb-ba0d59f746b8
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 6
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=28
 values:
   2022-01-01: 25_499
   2023-01-01: 0
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/refundable.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/refundable.yaml
index e634c19c1ce..aceb5ac640f 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/refundable.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/refundable.yaml
@@ -12,6 +12,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=18
     - title: 2024 Colorado Individual Income Tax Filing Guide, 104 Book
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=25
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=25
 
 
 values:
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml
index 8deef7c6723..7ff8b12a3b4 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/age_threshold.yaml
@@ -15,3 +15,5 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
   - title: 2024 Colorado State Sales Tax Refund
     href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
+  - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+    href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=23
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/amount.yaml
index ed0ce57b613..64766f4e35a 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/amount.yaml
@@ -11,3 +11,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=9
     - title: Colorado General Assembly HB23-1311 Identical Temporary TABOR Refund
       href: https://leg.colorado.gov/bills/hb23-1311#:~:text=The%20act%20creates%20a%20new,2022%2D23%20state%20fiscal%20year
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=23
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml
index 440eabd19e2..b9765368587 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/flat_amount_enabled.yaml
@@ -3,6 +3,7 @@ values:
   2021-01-01: false
   2023-01-01: true
   2024-01-01: false
+  2025-01-01: false
 metadata:
   period: year
   unit: bool
@@ -16,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
     - title: Colorado General Assembly HB23-1311 Identical Temporary TABOR Refund
       href: https://leg.colorado.gov/bills/hb23-1311#:~:text=The%20act%20creates%20a%20new,2022%2D23%20state%20fiscal%20year
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=23
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml
index c61a3500c54..a4d81cf0f50 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/multiplier.yaml
@@ -12,6 +12,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
     - title: 2024 Colorado State Sales Tax Refund
       href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=23
   breakdown:
     - filing_status
 
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml
index 64aca01edb9..acc37723d98 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/amount/scale.yaml
@@ -19,6 +19,8 @@ metadata:
       href: https://leg.colorado.gov/bills/hb23-1311#:~:text=The%20act%20creates%20a%20new,2022%2D23%20state%20fiscal%20year
     - title: 2024 Colorado State Sales Tax Refund
       href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=23
 brackets:
   - threshold:
       2021-01-01: -.inf
@@ -27,15 +29,18 @@ brackets:
       2022-01-01: 153
       2023-01-01: 0
       2024-01-01: 177
+      2025-01-01: 19
   - threshold:
       2021-01-01: 44_001
       2022-01-01: 48_001
       2024-01-01: 53_001
+      2025-01-01: 52_001
     amount:
       2021-01-01: 49
       2022-01-01: 208
       2023-01-01: 0
       2024-01-01: 240
+      2025-01-01: 25
   - threshold:
       2021-01-01: 88_001
       2022-01-01: 95_001
@@ -45,15 +50,18 @@ brackets:
       2022-01-01: 234
       2023-01-01: 0
       2024-01-01: 277
+      2025-01-01: 29
   - threshold:
       2021-01-01: 139_001
       2022-01-01: 151_001
       2024-01-01: 166_001
+      2025-01-01: 168_001
     amount:
       2021-01-01: 68
       2022-01-01: 285
       2023-01-01: 0
       2024-01-01: 323
+      2025-01-01: 35
   - threshold:
       2021-01-01: 193_001
       2022-01-01: 209_001
@@ -63,13 +71,16 @@ brackets:
       2022-01-01: 300
       2023-01-01: 0
       2024-01-01: 350
+      2025-01-01: 37
   - threshold:
       2021-01-01: 246_001
       2022-01-01: 268_001
       2024-01-01: 302_001
+      2025-01-01: 299_001
     amount:
       2021-01-01: 117
       2022-01-01: 486
       2023-01-01: 0
       2024-01-01: 565
+      2025-01-01: 59
 
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml
index 68631ff6a42..efc87ad9c68 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/sales_tax_refund/magi_sources.yaml
@@ -17,3 +17,5 @@ metadata:
     href: https://tax.colorado.gov/sites/tax/files/documents/DR_0104_Book_2022.pdf#page=23
   - title: 2024 Colorado State Sales Tax Refund
     href: https://tax.colorado.gov/income-tax-topics-state-sales-tax-refund
+  - title: 2025 Colorado Individual Tax Filing Guide 104 Book
+    href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=23
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/joint.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/joint.yaml
index d77a133c90e..dd22945863b 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/joint.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/joint.yaml
@@ -10,3 +10,5 @@ metadata:
     # The house bill initially appropriated a $800 rebate which was increased to $1,500 due to sufficient funds
     # https://www.colorado.gov/governor/news/providing-immediate-relief-governor-polis-state-leaders-announce-millions-colorado-cash-back
       href: https://leg.colorado.gov/sites/default/files/documents/2022A/bills/2022a_233_01.pdf
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=24
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/single.yaml b/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/single.yaml
index b0369b55a23..1b70f8e4ffb 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/single.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/credits/tabor/single.yaml
@@ -10,3 +10,5 @@ metadata:
     # The house bill initially appropriated a $400 rebate which was increased to $750 due to sufficient funds
     # https://www.colorado.gov/governor/news/providing-immediate-relief-governor-polis-state-leaders-announce-millions-colorado-cash-back
       href: https://leg.colorado.gov/sites/default/files/documents/2022A/bills/2022a_233_01.pdf
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=24
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/rate.yaml b/policyengine_us/parameters/gov/states/co/tax/income/rate.yaml
index cf0a100161a..af43d893ad8 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/rate.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/rate.yaml
@@ -21,6 +21,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=11
     - title: TABOR Refund Mechanisms Legislation 2024-2034
       href: https://leg.colorado.gov/bills/SB24-228
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Line 12
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=11
 
 values:
   1987-01-01: 0.05    # form rate determined by Legislation
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml
index 581b63731a5..4b510d05bf9 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/able_contribution/cap.yaml
@@ -12,6 +12,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=21
     - title: C.R.S. 39-22-104(4)(i)(II)(B)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 11
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=21
 
 JOINT:
   2023-01-01: 31_000
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml
index 26ebbef6bf9..57fd5cfb0d8 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/charitable_contribution/adjustment.yaml
@@ -17,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=14
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 12
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=21
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 12
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=21
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml
index 3c282a6469e..e586d95dce2 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/collegeinvest_contribution/max_amount.yaml
@@ -18,6 +18,8 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=13
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 10
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=20
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 10
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=20
 
 HEAD_OF_HOUSEHOLD:
   2021-01-01: .inf
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml
index 2cc8f9c39c2..ecbb19e97e2 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/age_threshold.yaml
@@ -17,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 7
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=19
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 7
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=19
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml
index e398e6fea9a..5746c4ab00f 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/military_retirement/max_amount.yaml
@@ -20,3 +20,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/Book0104_2023.pdf#page=12
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 7
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=19
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 7
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=19
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml
index 2aba4feb4c5..873b33f2ba8 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/older.yaml
@@ -17,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(III)(B)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=18
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml
index 4d3e913de5e..ac367ff6eaa 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/age_threshold/younger.yaml
@@ -17,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(I)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=18
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml
index 8c896fe37b7..6fa0d0a7c5c 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/older.yaml
@@ -17,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(III)(B)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=18
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml
index 9143c008b75..af427dff242 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/cap/younger.yaml
@@ -17,3 +17,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
     - title: C.R.S. 39-22-104(4)(g)(III)(A)
       href: https://law.justia.com/codes/colorado/2022/title-39/article-22/part-1/section-39-22-104/
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=18
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/income_sources.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/income_sources.yaml
index a48233d2ca1..638f1aac584 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/income_sources.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/income_sources.yaml
@@ -23,3 +23,5 @@ metadata:
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104AD_2023.pdf#page=1
     - title: Government of Colorado - Income Tax Topics, Social Security, Pensions, and Annuities
       href: https://tax.colorado.gov/sites/tax/files/documents/ITT_Social_Security_Pensions_and_Annuities_Feb_2023.pdf#page=2
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 4
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=18
diff --git a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml
index e673f430516..47f44ffc95d 100644
--- a/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml
+++ b/policyengine_us/parameters/gov/states/co/tax/income/subtractions/pension/social_security_subtraction_available.yaml
@@ -13,3 +13,5 @@ metadata:
       href: https://law.justia.com/codes/colorado/2021/title-39/article-22/part-1/section-39-22-104/
     - title: 2024 Colorado Individual Tax Filing Guide 104 Book - Subtractions Line 3
       href: https://tax.colorado.gov/sites/tax/files/documents/DR0104_book_2024.pdf#page=18
+    - title: 2025 Colorado Individual Tax Filing Guide 104 Book, Subtractions Line 3
+      href: https://tax.colorado.gov/sites/tax/files/documents/Book104_2025.pdf#page=18
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/eitc/co_eitc.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/eitc/co_eitc.yaml
index 0aee79a08bc..14476fc8548 100644
--- a/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/eitc/co_eitc.yaml
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/eitc/co_eitc.yaml
@@ -37,3 +37,40 @@
     state_code: CO
   output:
     co_eitc: 0
+
+# 2025 Tests - EITC match rate confirmed at 50% per Tax Policy Updates April 2025
+- name: Colorado matches 50% of EITC in 2025.
+  period: 2025
+  input:
+    eitc: 100
+    state_code: CO
+  output:
+    # 50% match rate per HB24-1134 with economic growth trigger met
+    co_eitc: 50
+
+- name: Colorado EITC 2025 - realistic earned income scenario
+  period: 2025
+  input:
+    people:
+      person1:
+        age: 35
+        employment_income: 20_000
+        is_tax_unit_head: true
+      child1:
+        age: 5
+        is_tax_unit_dependent: true
+    tax_units:
+      tax_unit:
+        members: [person1, child1]
+        filing_status: HEAD_OF_HOUSEHOLD
+    spm_units:
+      spm_unit:
+        members: [person1, child1]
+    households:
+      household:
+        members: [person1, child1]
+        state_code: CO
+  output:
+    # Federal EITC for 1 child at $20k income (head of household) is approximately $4,328
+    # CO EITC = 50% * federal EITC = $2,164
+    co_eitc: 2_164
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/sales_tax_refund/co_sales_tax_refund.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/sales_tax_refund/co_sales_tax_refund.yaml
index 6bd01b1a159..7ca1d347038 100644
--- a/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/sales_tax_refund/co_sales_tax_refund.yaml
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/credits/sales_tax_refund/co_sales_tax_refund.yaml
@@ -68,3 +68,121 @@
         filing_status: JOINT
   output:
     co_sales_tax_refund: 1_600
+
+# 2025 Tests - Sales Tax Refund brackets per Income Tax Topics: State Sales Tax Refund
+# Single filer brackets for 2025:
+#   $0-$52,000 -> $19
+#   $52,001-$105,000 -> $25
+#   $105,001-$168,000 -> $29
+#   $168,001-$233,000 -> $35
+#   $233,001-$299,000 -> $37
+#   $299,001+ -> $59
+
+- name: 2025 Single - lowest bracket ($0-$52,000)
+  period: 2025
+  input:
+    co_modified_agi: 30_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI $30,000 falls in first bracket: $19
+    co_sales_tax_refund: 19
+
+- name: 2025 Single - at first threshold boundary
+  period: 2025
+  input:
+    co_modified_agi: 52_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI exactly $52,000 -> still in first bracket: $19
+    co_sales_tax_refund: 19
+
+- name: 2025 Single - second bracket ($52,001-$105,000)
+  period: 2025
+  input:
+    co_modified_agi: 75_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI $75,000 falls in second bracket: $25
+    co_sales_tax_refund: 25
+
+- name: 2025 Single - third bracket ($105,001-$168,000)
+  period: 2025
+  input:
+    co_modified_agi: 130_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI $130,000 falls in third bracket: $29
+    co_sales_tax_refund: 29
+
+- name: 2025 Single - fourth bracket ($168,001-$233,000)
+  period: 2025
+  input:
+    co_modified_agi: 200_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI $200,000 falls in fourth bracket: $35
+    co_sales_tax_refund: 35
+
+- name: 2025 Single - fifth bracket ($233,001-$299,000)
+  period: 2025
+  input:
+    co_modified_agi: 260_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI $260,000 falls in fifth bracket: $37
+    co_sales_tax_refund: 37
+
+- name: 2025 Single - highest bracket ($299,001+)
+  period: 2025
+  input:
+    co_modified_agi: 400_000
+    co_sales_tax_refund_eligible: true
+    filing_status: SINGLE
+  output:
+    # AGI $400,000 falls in highest bracket: $59
+    co_sales_tax_refund: 59
+
+- name: 2025 Joint - lowest bracket (double single amount)
+  period: 2025
+  input:
+    co_modified_agi: 40_000
+    co_sales_tax_refund_eligible: true
+    filing_status: JOINT
+  output:
+    # AGI $40,000 in first bracket: $19 * 2 = $38
+    co_sales_tax_refund: 38
+
+- name: 2025 Joint - second bracket
+  period: 2025
+  input:
+    co_modified_agi: 80_000
+    co_sales_tax_refund_eligible: true
+    filing_status: JOINT
+  output:
+    # AGI $80,000 in second bracket: $25 * 2 = $50
+    co_sales_tax_refund: 50
+
+- name: 2025 Joint - highest bracket
+  period: 2025
+  input:
+    co_modified_agi: 500_000
+    co_sales_tax_refund_eligible: true
+    filing_status: JOINT
+  output:
+    # AGI $500,000 in highest bracket: $59 * 2 = $118
+    co_sales_tax_refund: 118
+
+- name: 2025 Ineligible - no refund regardless of income
+  period: 2025
+  input:
+    co_modified_agi: 50_000
+    co_sales_tax_refund_eligible: false
+    filing_status: SINGLE
+  output:
+    co_sales_tax_refund: 0
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/integration.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/integration.yaml
index 32dc605f2ab..e9937fda756 100644
--- a/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/integration.yaml
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/tax/income/integration.yaml
@@ -69,3 +69,271 @@
   output:
     co_sales_tax_refund: 177
     co_income_tax: -977
+
+# 2025 Integration Tests
+# Key 2025 parameters:
+# - Income tax rate: 4.4%
+# - EITC match: 50% of federal EITC
+# - Sales tax refund: Bracket-based (see co_sales_tax_refund.yaml)
+# - CTC max: $1,200 for ages 0-5
+# - Family Affordability Credit: $3,273 (ages 0-5), $2,455 (ages 6-16)
+
+- name: 2025 Single filer with employment income - basic tax calculation
+  absolute_error_margin: 1
+  period: 2025
+  input:
+    people:
+      person1:
+        age: 35
+        employment_income: 60_000
+        is_tax_unit_head: true
+    tax_units:
+      tax_unit:
+        members: [person1]
+        premium_tax_credit: 0
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: CO
+  output:
+    # Taxable income after federal standard deduction ($15,000 for 2025)
+    # CO taxable income = Federal AGI - CO subtractions = $60,000
+    # CO tax = taxable income * 4.4% rate
+    # Sales tax refund: $60k income -> second bracket ($52,001-$105,000) = $25
+    co_sales_tax_refund: 25
+
+- name: 2025 Joint filers with employment income - 4.4% tax rate
+  absolute_error_margin: 1
+  period: 2025
+  input:
+    people:
+      person1:
+        age: 40
+        employment_income: 80_000
+        is_tax_unit_head: true
+      person2:
+        age: 38
+        employment_income: 40_000
+        is_tax_unit_spouse: true
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+        filing_status: JOINT
+        premium_tax_credit: 0
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    households:
+      household:
+        members: [person1, person2]
+        state_code: CO
+  output:
+    # Combined income: $120,000
+    # Sales tax refund: $120k income -> third bracket ($105,001-$168,000)
+    # Joint amount = $29 * 2 = $58
+    co_sales_tax_refund: 58
+
+- name: 2025 Family with young child - CTC and Family Affordability Credit
+  absolute_error_margin: 5
+  period: 2025
+  input:
+    people:
+      parent1:
+        age: 32
+        employment_income: 20_000
+        is_tax_unit_head: true
+      child1:
+        age: 3
+        is_tax_unit_dependent: true
+    tax_units:
+      tax_unit:
+        members: [parent1, child1]
+        filing_status: HEAD_OF_HOUSEHOLD
+        premium_tax_credit: 0
+    spm_units:
+      spm_unit:
+        members: [parent1, child1]
+    households:
+      household:
+        members: [parent1, child1]
+        state_code: CO
+  output:
+    # Child under 6 qualifies for:
+    # - CTC: $1,200 max (income below $25k single threshold)
+    # - Family Affordability Credit: $3,273 (ages 0-5) * multiplier
+    # Sales tax refund: $20k income -> first bracket ($0-$52,000) = $19
+    co_sales_tax_refund: 19
+    co_ctc: 1_200
+
+- name: 2025 Family with older child - Family Affordability Credit only
+  absolute_error_margin: 5
+  period: 2025
+  input:
+    people:
+      parent1:
+        age: 40
+        employment_income: 15_000
+        is_tax_unit_head: true
+      child1:
+        age: 10
+        is_tax_unit_dependent: true
+    tax_units:
+      tax_unit:
+        members: [parent1, child1]
+        filing_status: HEAD_OF_HOUSEHOLD
+        premium_tax_credit: 0
+        co_ctc: 0
+        co_cdcc: 0
+        co_low_income_cdcc: 0
+        co_eitc: 0
+        co_sales_tax_refund: 0
+    spm_units:
+      spm_unit:
+        members: [parent1, child1]
+    households:
+      household:
+        members: [parent1, child1]
+        state_code: CO
+  output:
+    # Child age 10 qualifies for Family Affordability Credit only (age 6-16)
+    # $2,455 * 0.75 multiplier = $1,841.25 at full amount
+    # At $15k income (below threshold), should get full credit
+    co_family_affordability_credit: [0, 2_455]
+
+- name: 2025 EITC integration - low income worker with child
+  absolute_error_margin: 10
+  period: 2025
+  input:
+    people:
+      parent1:
+        age: 28
+        employment_income: 25_000
+        is_tax_unit_head: true
+      child1:
+        age: 7
+        is_tax_unit_dependent: true
+    tax_units:
+      tax_unit:
+        members: [parent1, child1]
+        filing_status: HEAD_OF_HOUSEHOLD
+        premium_tax_credit: 0
+    spm_units:
+      spm_unit:
+        members: [parent1, child1]
+    households:
+      household:
+        members: [parent1, child1]
+        state_code: CO
+  output:
+    # Federal EITC for 1 child at $25k income (head of household)
+    # CO EITC = 50% of federal EITC
+    # Sales tax refund: $25k income -> first bracket = $19
+    co_sales_tax_refund: 19
+
+- name: 2025 Senior with pension - senior subtraction eligible
+  absolute_error_margin: 5
+  period: 2025
+  input:
+    people:
+      person1:
+        age: 68
+        taxable_private_pension_income: 30_000
+        social_security: 18_000
+        is_tax_unit_head: true
+    tax_units:
+      tax_unit:
+        members: [person1]
+        premium_tax_credit: 0
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: CO
+  output:
+    # Senior (age 65+) qualifies for pension/SS subtraction
+    # Sales tax refund: $48k total income -> first bracket = $19
+    co_sales_tax_refund: 19
+
+- name: 2025 High income family - phased out credits
+  absolute_error_margin: 5
+  period: 2025
+  input:
+    people:
+      parent1:
+        age: 45
+        employment_income: 150_000
+        is_tax_unit_head: true
+      parent2:
+        age: 43
+        employment_income: 100_000
+        is_tax_unit_spouse: true
+      child1:
+        age: 4
+        is_tax_unit_dependent: true
+    tax_units:
+      tax_unit:
+        members: [parent1, parent2, child1]
+        filing_status: JOINT
+        premium_tax_credit: 0
+    spm_units:
+      spm_unit:
+        members: [parent1, parent2, child1]
+    households:
+      household:
+        members: [parent1, parent2, child1]
+        state_code: CO
+  output:
+    # Combined income: $250,000
+    # CTC: Phased out at this income level (joint limit ~$87k)
+    # Family Affordability Credit: Phased out (joint limit ~$96k)
+    # Sales tax refund: $250k -> fifth bracket ($233,001-$299,000)
+    # Joint amount = $37 * 2 = $74
+    co_sales_tax_refund: 74
+    co_ctc: 0
+
+- name: 2025 Family with multiple children - different age groups
+  absolute_error_margin: 5
+  period: 2025
+  input:
+    people:
+      parent1:
+        age: 35
+        employment_income: 10_000
+        is_tax_unit_head: true
+      child1:
+        age: 2
+        is_tax_unit_dependent: true
+      child2:
+        age: 8
+        is_tax_unit_dependent: true
+      child3:
+        age: 14
+        is_tax_unit_dependent: true
+    tax_units:
+      tax_unit:
+        members: [parent1, child1, child2, child3]
+        filing_status: HEAD_OF_HOUSEHOLD
+        premium_tax_credit: 0
+        co_ctc: 0
+        co_cdcc: 0
+        co_low_income_cdcc: 0
+        co_eitc: 0
+        co_sales_tax_refund: 0
+    spm_units:
+      spm_unit:
+        members: [parent1, child1, child2, child3]
+    households:
+      household:
+        members: [parent1, child1, child2, child3]
+        state_code: CO
+  output:
+    # Child age 2: CTC $1,200 + FATC $3,273
+    # Child age 8: FATC $2,455 (age 6-16 category)
+    # Child age 14: FATC $2,455 (age 6-16 category)
+    # At $10k income (below thresholds), full credit amounts
+    co_family_affordability_credit: [0, 3_273, 2_455, 2_455]