diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb2d..7602c3c4dbd 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,5 @@
+- bump: minor
+  changes:
+    added:
+    - Illinois Preschool For All (PFA) and Preschool For All Expansion (PFAE) programs with age (3-5), income (400% FPL), and weighted priority factor eligibility.
+    - New input variables for IEP status, developmental delay, non-English speaking home, parent education level, born outside US, and no prior formal early learning.
diff --git a/policyengine_us/parameters/gov/states/il/isbe/age_threshold/teen_parent.yaml b/policyengine_us/parameters/gov/states/il/isbe/age_threshold/teen_parent.yaml
new file mode 100644
index 00000000000..1f6053d636a
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/age_threshold/teen_parent.yaml
@@ -0,0 +1,15 @@
+description: Illinois sets this age threshold for the teen parent risk factor under the Illinois State Board of Education early childhood programs.
+values:
+  2015-01-01: 20
+
+metadata:
+  unit: year
+  period: year
+  label: Illinois ISBE teen parent age threshold
+  reference:
+    # ISBE lists "teen parent" as a risk factor but does not define the age threshold.
+    # Using IDHS definition of teen parent as "under age 20".
+    - title: ISBE PFAE Eligibility Form Section 2 (25-point factors)
+      href: https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2
+    - title: IDHS Teen Parent Services Program (under age 20)
+      href: https://www.dhs.state.il.us/Page.aspx?item=32189
diff --git a/policyengine_us/parameters/gov/states/il/isbe/income/countable_sources.yaml b/policyengine_us/parameters/gov/states/il/isbe/income/countable_sources.yaml
new file mode 100644
index 00000000000..7d664ce4c03
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/income/countable_sources.yaml
@@ -0,0 +1,28 @@
+description: Illinois includes these income sources for countable income under the Illinois State Board of Education early childhood programs.
+values:
+  2015-01-01:
+    # Earned income
+    - employment_income
+    - self_employment_income
+    # Unearned income included per ISBE Household and Income Form
+    - child_support_received
+    - alimony_income
+    - pension_income
+    - retirement_distributions
+    - social_security
+    - ssi
+    - veterans_benefits
+    - disability_benefits
+    - workers_compensation
+    - unemployment_compensation
+    - strike_benefits
+    # Excluded: snap, wic, tanf (welfare benefits)
+    # Excluded: Federal education benefits, foster payments
+
+metadata:
+  unit: list
+  period: year
+  label: Illinois ISBE countable income sources
+  reference:
+    - title: ISBE Household and Income Form (69-72)
+      href: https://www.isbe.net/Documents/69-72_hshld_income.pdf
diff --git a/policyengine_us/parameters/gov/states/il/isbe/income/income_limit_rate.yaml b/policyengine_us/parameters/gov/states/il/isbe/income/income_limit_rate.yaml
new file mode 100644
index 00000000000..b5434a4ae37
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/income/income_limit_rate.yaml
@@ -0,0 +1,13 @@
+description: Illinois uses this share of the federal poverty level as the income limit under the Illinois State Board of Education early childhood programs.
+values:
+  2015-01-01: 4
+
+metadata:
+  unit: /1
+  period: year
+  label: Illinois ISBE income limit FPL rate
+  reference:
+    - title: 105 ILCS 5/2-3.71(a)(4.5) - Preschool program
+      href: https://law.onecle.com/illinois/105ilcs5/2-3.71.html
+    - title: ISBE Preschool for All Implementation Manual
+      href: https://www.isbe.net/Documents/Preschool_for_All_Implementation_Manual.pdf#page=7
diff --git a/policyengine_us/parameters/gov/states/il/isbe/pfa/benefit/amount.yaml b/policyengine_us/parameters/gov/states/il/isbe/pfa/benefit/amount.yaml
new file mode 100644
index 00000000000..61a59d8c61c
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/pfa/benefit/amount.yaml
@@ -0,0 +1,15 @@
+description: Illinois provides this amount as per-child funding under the Preschool For All program.
+values:
+  # FY2024: $20.99M total / 5,383 children = $3,900
+  # FY2025: $15.63M total / 4,008 children = $3,900
+  2024-01-01: 3_900
+
+metadata:
+  unit: currency-USD
+  period: year
+  label: Illinois PFA per-child funding amount
+  reference:
+    - title: Gov. Pritzker Smart Start FY2024 Press Release ($20.99M / 5,383 children)
+      href: https://www.illinois.gov/news/press-release.29519.html
+    - title: Gov. Pritzker Smart Start FY2025 Press Release ($15.63M / 4,008 children)
+      href: https://gov-pritzker-newsroom.prezly.com/gov-pritzker-announces-5150-new-preschool-seats-through-smart-start-initiative
diff --git a/policyengine_us/parameters/gov/states/il/isbe/pfae/benefit/amount.yaml b/policyengine_us/parameters/gov/states/il/isbe/pfae/benefit/amount.yaml
new file mode 100644
index 00000000000..0d9a7199568
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/pfae/benefit/amount.yaml
@@ -0,0 +1,15 @@
+description: Illinois provides this amount as per-child funding under the Preschool For All Expansion program.
+values:
+  # FY2024: $4.28M total / 503 children = $8,500
+  # FY2025: $9.70M total / 1,142 children = $8,500
+  2024-01-01: 8_500
+
+metadata:
+  unit: currency-USD
+  period: year
+  label: Illinois PFAE per-child funding amount
+  reference:
+    - title: Gov. Pritzker Smart Start FY2024 Press Release ($4.28M / 503 children)
+      href: https://www.illinois.gov/news/press-release.29519.html
+    - title: Gov. Pritzker Smart Start FY2025 Press Release ($9.70M / 1,142 children)
+      href: https://gov-pritzker-newsroom.prezly.com/gov-pritzker-announces-5150-new-preschool-seats-through-smart-start-initiative
diff --git a/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/age_range.yaml b/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/age_range.yaml
new file mode 100644
index 00000000000..27bbdff6a9e
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/age_range.yaml
@@ -0,0 +1,26 @@
+description: Illinois limits eligibility to children of this age under the Preschool For All Expansion (PFAE) program.
+brackets:
+  - threshold:
+      2015-01-01: 0
+    amount:
+      2015-01-01: false
+  - threshold:
+      2015-01-01: 3
+    amount:
+      2015-01-01: true
+  - threshold:
+      2015-01-01: 6
+    amount:
+      2015-01-01: false
+
+metadata:
+  type: single_amount
+  amount_unit: bool
+  threshold_unit: year
+  period: year
+  label: Illinois PFAE eligible age range
+  reference:
+    - title: 23 IAC § 235.10 - Definitions (ages 3 to kindergarten enrollment)
+      href: https://www.law.cornell.edu/regulations/illinois/Ill-Admin-Code-tit-23-SS-235.10
+    - title: 105 ILCS 5/10-20.12 - Kindergarten enrollment age (age 5 by Sept 1)
+      href: https://law.onecle.com/illinois/105ilcs5/10-20.12.html
diff --git a/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/income/deep_poverty_rate.yaml b/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/income/deep_poverty_rate.yaml
new file mode 100644
index 00000000000..2c66055d222
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/income/deep_poverty_rate.yaml
@@ -0,0 +1,10 @@
+description: Illinois uses this share of the federal poverty level as the deep poverty threshold (50-point factor) under the Preschool For All Expansion (PFAE) program.
+metadata:
+  unit: /1
+  period: year
+  label: Illinois PFAE deep poverty FPL rate
+  reference:
+    - title: ISBE PDG Enrollment Form (50-point factors)
+      href: https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2
+values:
+  2015-01-01: 0.5
diff --git a/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/income/low_income_rate.yaml b/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/income/low_income_rate.yaml
new file mode 100644
index 00000000000..754665d8f31
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/il/isbe/pfae/eligibility/income/low_income_rate.yaml
@@ -0,0 +1,10 @@
+description: Illinois uses this share of the federal poverty level as the low income threshold (25-point factor) under the Preschool For All Expansion (PFAE) program.
+metadata:
+  unit: /1
+  period: year
+  label: Illinois PFAE low income FPL rate
+  reference:
+    - title: ISBE PDG Enrollment Form (25-point factors)
+      href: https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2
+values:
+  2015-01-01: 1
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/eligibility/il_isbe_income_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/eligibility/il_isbe_income_eligible.yaml
new file mode 100644
index 00000000000..6dc5a2af696
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/eligibility/il_isbe_income_eligible.yaml
@@ -0,0 +1,15 @@
+- name: Case 1, income well below 400% FPL.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 20_000
+  output:
+    il_isbe_income_eligible: true
+
+- name: Case 2, income above 400% FPL.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 150_000
+  output:
+    il_isbe_income_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/eligibility/il_isbe_was_teen_parent_at_first_birth.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/eligibility/il_isbe_was_teen_parent_at_first_birth.yaml
new file mode 100644
index 00000000000..db6e0eb8bd6
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/eligibility/il_isbe_was_teen_parent_at_first_birth.yaml
@@ -0,0 +1,310 @@
+# Edge case tests for il_isbe_was_teen_parent_at_first_birth
+# Tests if parent was under age 20 when their oldest child was born
+# Formula: has_children & (head_age - oldest_child_age < 20)
+# Threshold: teen_parent_age_threshold = 20
+
+- name: Case 1, parent was teen at birth.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 35
+        is_tax_unit_head: true
+      person2:
+        age: 17
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 35, oldest child age 17
+    # Age at first birth: 35 - 17 = 18
+    # 18 < 20 = TRUE (was teen parent)
+    il_isbe_was_teen_parent_at_first_birth: true
+
+- name: Case 2, parent was NOT teen at birth.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 45
+        is_tax_unit_head: true
+      person2:
+        age: 17
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 45, oldest child age 17
+    # Age at first birth: 45 - 17 = 28
+    # 28 < 20 = FALSE (was not teen parent)
+    il_isbe_was_teen_parent_at_first_birth: false
+
+- name: Case 3, boundary exactly 19 at birth should be TRUE.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 36
+        is_tax_unit_head: true
+      person2:
+        age: 17
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 36, oldest child age 17
+    # Age at first birth: 36 - 17 = 19
+    # 19 < 20 = TRUE (was teen parent)
+    il_isbe_was_teen_parent_at_first_birth: true
+
+- name: Case 4, boundary exactly 20 at birth should be FALSE.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 37
+        is_tax_unit_head: true
+      person2:
+        age: 17
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 37, oldest child age 17
+    # Age at first birth: 37 - 17 = 20
+    # 20 < 20 = FALSE (20 is NOT less than 20)
+    il_isbe_was_teen_parent_at_first_birth: false
+
+- name: Case 5, no children in household.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 30
+        is_tax_unit_head: true
+    households:
+      household:
+        members: [person1]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1]
+    tax_units:
+      tax_unit:
+        members: [person1]
+  output:
+    # No children (is_child requires age < 18)
+    # has_children = FALSE
+    # Result: FALSE regardless of age
+    il_isbe_was_teen_parent_at_first_birth: false
+
+- name: Case 6, multiple children uses oldest child age.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 35
+        is_tax_unit_head: true
+      person2:
+        age: 5
+      person3:
+        age: 17
+    households:
+      household:
+        members: [person1, person2, person3]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2, person3]
+    tax_units:
+      tax_unit:
+        members: [person1, person2, person3]
+  output:
+    # Parent age 35, children ages 5 and 17
+    # Oldest child is 17 (rank 0 with -age ordering)
+    # Age at first birth: 35 - 17 = 18
+    # 18 < 20 = TRUE
+    il_isbe_was_teen_parent_at_first_birth: true
+
+- name: Case 7, all adults no children under 18.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 40
+        is_tax_unit_head: true
+      person2:
+        age: 18
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Person2 is 18, is_child requires age < 18
+    # No qualifying children
+    # has_children = FALSE
+    il_isbe_was_teen_parent_at_first_birth: false
+
+- name: Case 8, newborn with parent exactly 20 at birth.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 20
+        is_tax_unit_head: true
+      person2:
+        age: 0
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 20, child age 0
+    # Age at first birth: 20 - 0 = 20
+    # 20 < 20 = FALSE (exactly at threshold)
+    il_isbe_was_teen_parent_at_first_birth: false
+
+- name: Case 9, young parent with young child was teen.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 21
+        is_tax_unit_head: true
+      person2:
+        age: 2
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 21, child age 2
+    # Age at first birth: 21 - 2 = 19
+    # 19 < 20 = TRUE
+    il_isbe_was_teen_parent_at_first_birth: true
+
+- name: Case 10, newborn with parent exactly 19 at birth.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 19
+        is_tax_unit_head: true
+      person2:
+        age: 0
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 19, child age 0
+    # Age at first birth: 19 - 0 = 19
+    # 19 < 20 = TRUE
+    il_isbe_was_teen_parent_at_first_birth: true
+
+- name: Case 11, three children uses oldest.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 40
+        is_tax_unit_head: true
+      person2:
+        age: 3
+      person3:
+        age: 10
+      person4:
+        age: 16
+    households:
+      household:
+        members: [person1, person2, person3, person4]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2, person3, person4]
+    tax_units:
+      tax_unit:
+        members: [person1, person2, person3, person4]
+  output:
+    # Parent age 40, children ages 3, 10, 16
+    # Oldest child is 16
+    # Age at first birth: 40 - 16 = 24
+    # 24 < 20 = FALSE
+    il_isbe_was_teen_parent_at_first_birth: false
+
+- name: Case 12, boundary 21 at birth should be FALSE.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 38
+        is_tax_unit_head: true
+      person2:
+        age: 17
+    households:
+      household:
+        members: [person1, person2]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+  output:
+    # Parent age 38, oldest child age 17
+    # Age at first birth: 38 - 17 = 21
+    # 21 < 20 = FALSE
+    il_isbe_was_teen_parent_at_first_birth: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_age_eligible_child.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_age_eligible_child.yaml
new file mode 100644
index 00000000000..31d0c75f6d3
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_age_eligible_child.yaml
@@ -0,0 +1,39 @@
+- name: Case 1, eligible child age 3.
+  period: 2024
+  input:
+    age: 3
+    state_code: IL
+  output:
+    il_pfae_age_eligible_child: true
+
+- name: Case 2, eligible child age 4.
+  period: 2024
+  input:
+    age: 4
+    state_code: IL
+  output:
+    il_pfae_age_eligible_child: true
+
+- name: Case 3, eligible child age 5.
+  period: 2024
+  input:
+    age: 5
+    state_code: IL
+  output:
+    il_pfae_age_eligible_child: true
+
+- name: Case 4, ineligible child age 2 too young.
+  period: 2024
+  input:
+    age: 2
+    state_code: IL
+  output:
+    il_pfae_age_eligible_child: false
+
+- name: Case 5, ineligible child age 6 too old.
+  period: 2024
+  input:
+    age: 6
+    state_code: IL
+  output:
+    il_pfae_age_eligible_child: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_basic_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_basic_eligible.yaml
new file mode 100644
index 00000000000..a4854ff8237
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_basic_eligible.yaml
@@ -0,0 +1,26 @@
+- name: Case 1, age and income eligible.
+  period: 2024
+  input:
+    state_code: IL
+    age: 4
+    employment_income: 20_000
+  output:
+    il_pfae_basic_eligible: true
+
+- name: Case 2, age eligible but income too high.
+  period: 2024
+  input:
+    state_code: IL
+    age: 4
+    employment_income: 150_000
+  output:
+    il_pfae_basic_eligible: false
+
+- name: Case 3, income eligible but age too old.
+  period: 2024
+  input:
+    state_code: IL
+    age: 7
+    employment_income: 20_000
+  output:
+    il_pfae_basic_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_eligible.yaml
new file mode 100644
index 00000000000..10d1ac47966
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/eligibility/il_pfae_eligible.yaml
@@ -0,0 +1,49 @@
+- name: Case 1, eligible with highest priority factor (IEP).
+  period: 2024
+  input:
+    state_code: IL
+    age: 4
+    has_individualized_education_program: true
+    employment_income: 20_000
+  output:
+    il_pfae_eligible: true
+
+- name: Case 2, eligible with highest priority factor (foster care).
+  period: 2024
+  input:
+    state_code: IL
+    age: 3
+    is_in_foster_care: true
+    employment_income: 15_000
+  output:
+    il_pfae_eligible: true
+
+- name: Case 3, eligible with two secondary priority factors.
+  period: 2024
+  input:
+    state_code: IL
+    age: 4
+    parent_has_less_than_high_school_education: true
+    employment_income: 10_000
+  output:
+    # low_income (25pt) + low_education (25pt) = 2 factors
+    il_pfae_eligible: true
+
+- name: Case 4, ineligible age too old.
+  period: 2024
+  input:
+    state_code: IL
+    age: 6
+    has_individualized_education_program: true
+  output:
+    il_pfae_eligible: false
+
+- name: Case 5, ineligible income too high.
+  period: 2024
+  input:
+    state_code: IL
+    age: 4
+    has_individualized_education_program: true
+    employment_income: 150_000
+  output:
+    il_pfae_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/integration.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/integration.yaml
new file mode 100644
index 00000000000..835f009624b
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/integration.yaml
@@ -0,0 +1,102 @@
+- name: Case 1, family with one eligible and one ineligible child.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 35
+        employment_income: 20_000
+      person2:
+        age: 4
+        has_individualized_education_program: true
+      person3:
+        age: 8
+    households:
+      household:
+        members: [person1, person2, person3]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2, person3]
+    tax_units:
+      tax_unit:
+        members: [person1, person2, person3]
+  output:
+    # Age eligibility: only person2 (age 4) is eligible
+    il_pfae_age_eligible_child: [false, true, false]
+    # Highest priority: person2 has IEP
+    il_pfae_has_highest_priority_factor: [false, true, false]
+    # PFAE eligibility: only person2 is eligible
+    il_pfae_eligible: [false, true, false]
+    # PFA eligibility mirrors PFAE
+    il_pfa_eligible: [false, true, false]
+    # Benefit amounts (FY2024 values same as FY2025)
+    il_pfae: [0, 8_500, 0]
+    il_pfa: [0, 3_900, 0]
+
+- name: Case 2, family with two eligible children showing benefit amounts.
+  period: 2025
+  input:
+    people:
+      person1:
+        age: 32
+        employment_income: 15_000
+      person2:
+        age: 3
+        has_individualized_education_program: true
+      person3:
+        age: 5
+        is_in_foster_care: true
+    households:
+      household:
+        members: [person1, person2, person3]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2, person3]
+    tax_units:
+      tax_unit:
+        members: [person1, person2, person3]
+  output:
+    # Both children are age eligible
+    il_pfae_age_eligible_child: [false, true, true]
+    # Both have highest priority factors (IEP, foster care)
+    il_pfae_has_highest_priority_factor: [false, true, true]
+    # Both children are PFAE eligible
+    il_pfae_eligible: [false, true, true]
+    il_pfa_eligible: [false, true, true]
+    # Benefit amounts per eligible child (FY2025 values)
+    # PFAE: $8,500 per child
+    il_pfae: [0, 8_500, 8_500]
+    # PFA: $3,900 per child
+    il_pfa: [0, 3_900, 3_900]
+
+- name: Case 3, family with no eligible children.
+  period: 2024
+  input:
+    people:
+      person1:
+        age: 40
+        employment_income: 80_000
+      person2:
+        age: 10
+      person3:
+        age: 2
+    households:
+      household:
+        members: [person1, person2, person3]
+        state_code: IL
+    spm_units:
+      spm_unit:
+        members: [person1, person2, person3]
+    tax_units:
+      tax_unit:
+        members: [person1, person2, person3]
+  output:
+    # No children in age range 3-5
+    il_pfae_age_eligible_child: [false, false, false]
+    # No PFAE eligibility
+    il_pfae_eligible: [false, false, false]
+    il_pfa_eligible: [false, false, false]
+    # No benefits
+    il_pfae: [0, 0, 0]
+    il_pfa: [0, 0, 0]
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_has_highest_priority_factor.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_has_highest_priority_factor.yaml
new file mode 100644
index 00000000000..25f8a87db44
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_has_highest_priority_factor.yaml
@@ -0,0 +1,31 @@
+- name: Case 1, has IEP.
+  period: 2024
+  input:
+    state_code: IL
+    has_individualized_education_program: true
+  output:
+    il_pfae_has_highest_priority_factor: true
+
+- name: Case 2, in foster care.
+  period: 2024
+  input:
+    state_code: IL
+    is_in_foster_care: true
+  output:
+    il_pfae_has_highest_priority_factor: true
+
+- name: Case 3, deep poverty.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 5_000
+  output:
+    il_pfae_has_highest_priority_factor: true
+
+- name: Case 4, no highest priority factors.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 30_000
+  output:
+    il_pfae_has_highest_priority_factor: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_is_deep_poverty.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_is_deep_poverty.yaml
new file mode 100644
index 00000000000..b6104cbbff7
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_is_deep_poverty.yaml
@@ -0,0 +1,15 @@
+- name: Case 1, income below 50% FPL.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 5_000
+  output:
+    il_pfae_is_deep_poverty: true
+
+- name: Case 2, income above 50% FPL.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 30_000
+  output:
+    il_pfae_is_deep_poverty: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_is_low_income.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_is_low_income.yaml
new file mode 100644
index 00000000000..a711168ce2d
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_is_low_income.yaml
@@ -0,0 +1,15 @@
+- name: Case 1, income below 100% FPL.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 10_000
+  output:
+    il_pfae_is_low_income: true
+
+- name: Case 2, income above 100% FPL.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 50_000
+  output:
+    il_pfae_is_low_income: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_secondary_priority_factor_count.yaml b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_secondary_priority_factor_count.yaml
new file mode 100644
index 00000000000..006a55a890a
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/il/isbe/pfae/priority/il_pfae_secondary_priority_factor_count.yaml
@@ -0,0 +1,85 @@
+- name: Case 1, low income only.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 10_000
+  output:
+    il_pfae_secondary_priority_factor_count: 1
+
+- name: Case 2, low income and low education.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 10_000
+    parent_has_less_than_high_school_education: true
+  output:
+    il_pfae_secondary_priority_factor_count: 2
+
+- name: Case 3, developmental delay without IEP.
+  period: 2024
+  input:
+    state_code: IL
+    has_developmental_delay: true
+    employment_income: 50_000
+  output:
+    il_pfae_secondary_priority_factor_count: 1
+
+- name: Case 4, developmental delay with IEP not counted.
+  period: 2024
+  input:
+    state_code: IL
+    has_developmental_delay: true
+    has_individualized_education_program: true
+    employment_income: 50_000
+  output:
+    # IEP is 50-pt factor, so delay doesn't count as 25-pt
+    il_pfae_secondary_priority_factor_count: 0
+
+- name: Case 5, no secondary priority factors.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 50_000
+  output:
+    il_pfae_secondary_priority_factor_count: 0
+
+- name: Case 6, immigrant family factor (child born outside US).
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 50_000
+    is_born_outside_us: true
+  output:
+    il_pfae_secondary_priority_factor_count: 1
+
+- name: Case 7, no prior formal early learning factor.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 50_000
+    has_no_prior_formal_early_learning: true
+  output:
+    # Child has NOT participated in formal early learning = 25 pts
+    il_pfae_secondary_priority_factor_count: 1
+
+- name: Case 8, teen parent at first birth factor.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 50_000
+    il_isbe_was_teen_parent_at_first_birth: true
+  output:
+    # Parent was under 20 when first child was born = 25 pts
+    il_pfae_secondary_priority_factor_count: 1
+
+- name: Case 9, multiple factors combined.
+  period: 2024
+  input:
+    state_code: IL
+    employment_income: 50_000
+    il_isbe_was_teen_parent_at_first_birth: true
+    is_born_outside_us: true
+    has_no_prior_formal_early_learning: true
+  output:
+    # Teen parent (1) + immigrant (1) + no prior learning (1) = 3
+    il_pfae_secondary_priority_factor_count: 3
diff --git a/policyengine_us/variables/gov/states/il/isbe/eligibility/il_isbe_income_eligible.py b/policyengine_us/variables/gov/states/il/isbe/eligibility/il_isbe_income_eligible.py
new file mode 100644
index 00000000000..c96905fcf8f
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/eligibility/il_isbe_income_eligible.py
@@ -0,0 +1,26 @@
+from policyengine_us.model_api import *
+
+
+class il_isbe_income_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = (
+        "Meets income requirements for Illinois ISBE early childhood programs"
+    )
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://law.onecle.com/illinois/105ilcs5/2-3.71.html",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        # Income must be at or below 400% FPL for program eligibility.
+        # 105 ILCS 5/2-3.71 establishes "4 times the poverty guidelines" as the
+        # maximum income threshold for preschool program eligibility.
+        p = parameters(period).gov.states.il.isbe.income
+        spm_unit = person.spm_unit
+        fpg = spm_unit("spm_unit_fpg", period)
+        income = spm_unit("il_isbe_countable_income", period)
+        threshold = fpg * p.income_limit_rate
+        return income <= threshold
diff --git a/policyengine_us/variables/gov/states/il/isbe/eligibility/il_isbe_was_teen_parent_at_first_birth.py b/policyengine_us/variables/gov/states/il/isbe/eligibility/il_isbe_was_teen_parent_at_first_birth.py
new file mode 100644
index 00000000000..16fbaf267a1
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/eligibility/il_isbe_was_teen_parent_at_first_birth.py
@@ -0,0 +1,32 @@
+from policyengine_us.model_api import *
+
+
+class il_isbe_was_teen_parent_at_first_birth(Variable):
+    value_type = bool
+    entity = SPMUnit
+    label = "Parent was a teen at birth of first child"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf"
+    )
+    defined_for = StateCode.IL
+
+    def formula(spm_unit, period, parameters):
+        person = spm_unit.members
+        age = person("age", period.this_year)
+        is_child = person("is_child", period.this_year)
+
+        # Find oldest child using get_rank (rank 0 = oldest when using -age)
+        is_oldest_child = person.get_rank(spm_unit, -age, is_child) == 0
+
+        # Get ages
+        head_age = spm_unit.max(age * person("is_tax_unit_head", period))
+        oldest_child_age = spm_unit.max(age * is_oldest_child)
+
+        # Calculate parent's age at first birth
+        age_at_first_birth = head_age - oldest_child_age
+
+        # Check if parent was under threshold age at birth and has children
+        p = parameters(period).gov.states.il.isbe.age_threshold
+        has_children = spm_unit.any(is_child)
+        return has_children & (age_at_first_birth < p.teen_parent)
diff --git a/policyengine_us/variables/gov/states/il/isbe/income/il_isbe_countable_income.py b/policyengine_us/variables/gov/states/il/isbe/income/il_isbe_countable_income.py
new file mode 100644
index 00000000000..691802f3e9c
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/income/il_isbe_countable_income.py
@@ -0,0 +1,13 @@
+from policyengine_us.model_api import *
+
+
+class il_isbe_countable_income(Variable):
+    value_type = float
+    entity = SPMUnit
+    label = "Illinois ISBE countable income"
+    unit = USD
+    definition_period = YEAR
+    reference = "https://www.isbe.net/Documents/Income-Verification-FAQ.pdf"
+    defined_for = StateCode.IL
+
+    adds = "gov.states.il.isbe.income.countable_sources"
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfa/il_pfa.py b/policyengine_us/variables/gov/states/il/isbe/pfa/il_pfa.py
new file mode 100644
index 00000000000..863cb4df9b8
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfa/il_pfa.py
@@ -0,0 +1,15 @@
+from policyengine_us.model_api import *
+
+
+class il_pfa(Variable):
+    value_type = float
+    entity = Person
+    label = "Illinois Preschool For All (PFA) benefit"
+    definition_period = YEAR
+    unit = USD
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://gov-pritzker-newsroom.prezly.com/gov-pritzker-announces-5150-new-preschool-seats-through-smart-start-initiative",
+    )
+    defined_for = "il_pfa_eligible"
+    adds = ["gov.states.il.isbe.pfa.benefit.amount"]
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfa/il_pfa_eligible.py b/policyengine_us/variables/gov/states/il/isbe/pfa/il_pfa_eligible.py
new file mode 100644
index 00000000000..f80d8d51f49
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfa/il_pfa_eligible.py
@@ -0,0 +1,18 @@
+from policyengine_us.model_api import *
+
+
+class il_pfa_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Eligible for Illinois Preschool For All (PFA)"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf",
+    )
+    defined_for = StateCode.IL
+    # PFA and PFAE share identical eligibility criteria. The difference is
+    # service level: PFA provides half-day, PFAE provides full-day programs.
+    # A child receives one or the other based on local program availability,
+    # not both simultaneously.
+    adds = ["il_pfae_eligible"]
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_age_eligible_child.py b/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_age_eligible_child.py
new file mode 100644
index 00000000000..ac197fd605d
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_age_eligible_child.py
@@ -0,0 +1,23 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_age_eligible_child(Variable):
+    value_type = bool
+    entity = Person
+    label = "Child meets age requirements for Illinois PFAE"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        # PFA/PFAE serves children ages 3-4, plus 5-year-olds not yet
+        # kindergarten eligible. Per 105 ILCS 5/10-20.12, children who
+        # turn 5 on or before September 1 are kindergarten eligible.
+        # Since PolicyEngine uses age in whole years without birth month,
+        # we include all 5-year-olds as a simplification (some are eligible).
+        p = parameters(period).gov.states.il.isbe.pfae.eligibility
+        age = person("age", period)
+        return p.age_range.calc(age)
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_basic_eligible.py b/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_basic_eligible.py
new file mode 100644
index 00000000000..9ed07aa2bd7
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_basic_eligible.py
@@ -0,0 +1,19 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_basic_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Meets basic eligibility for Illinois PFAE (age and income)"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        # Basic eligibility: age 3-5 and income <= 400% FPL
+        age_eligible = person("il_pfae_age_eligible_child", period)
+        income_eligible = person("il_isbe_income_eligible", period)
+        return age_eligible & income_eligible
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_eligible.py b/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_eligible.py
new file mode 100644
index 00000000000..c54b4c20eef
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/eligibility/il_pfae_eligible.py
@@ -0,0 +1,28 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Eligible for Illinois Preschool For All Expansion (PFAE)"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        # PFAE eligibility requires:
+        # - Basic eligibility (age 3-5, income <= 400% FPL)
+        # - AND either:
+        #   - Any highest priority factor (direct enrollment), OR
+        #   - 2+ secondary priority factors
+        basic_eligible = person("il_pfae_basic_eligible", period)
+        has_highest_priority = person(
+            "il_pfae_has_highest_priority_factor", period
+        )
+        secondary_count = person(
+            "il_pfae_secondary_priority_factor_count", period
+        )
+        return basic_eligible & (has_highest_priority | (secondary_count >= 2))
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/il_pfae.py b/policyengine_us/variables/gov/states/il/isbe/pfae/il_pfae.py
new file mode 100644
index 00000000000..88d7565ad8d
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/il_pfae.py
@@ -0,0 +1,19 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae(Variable):
+    value_type = float
+    entity = Person
+    label = "Illinois Preschool For All Expansion (PFAE) benefit"
+    definition_period = YEAR
+    unit = USD
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://gov-pritzker-newsroom.prezly.com/gov-pritzker-announces-5150-new-preschool-seats-through-smart-start-initiative",
+    )
+    defined_for = "il_pfae_eligible"
+    # PFA and PFAE share identical eligibility criteria. The difference is
+    # service level: PFA provides half-day, PFAE provides full-day programs.
+    # A child receives one or the other based on local program availability,
+    # not both simultaneously.
+    adds = ["gov.states.il.isbe.pfae.benefit.amount"]
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_has_highest_priority_factor.py b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_has_highest_priority_factor.py
new file mode 100644
index 00000000000..b73e6c325a4
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_has_highest_priority_factor.py
@@ -0,0 +1,40 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_has_highest_priority_factor(Variable):
+    value_type = bool
+    entity = Person
+    label = "Has highest priority selection factor for Illinois PFAE"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        # Highest priority selection factors (50 points each):
+        # 1. Homeless (McKinney-Vento)
+        # 2. Child welfare involvement (foster care, Ward of State)
+        # 3. Has IEP or referred for special education evaluation
+        # 4. Family income at or below 50% FPL and/or receiving TANF
+        # Factor 1: Homeless
+        is_homeless = person.household("is_homeless", period)
+
+        # Factor 2: Child welfare involvement (foster care)
+        is_in_foster_care = person("is_in_foster_care", period)
+
+        # Factor 3: Has IEP
+        has_iep = person("has_individualized_education_program", period)
+
+        # Factor 4: Income <= 50% FPL OR receiving TANF
+        is_deep_poverty = person("il_pfae_is_deep_poverty", period)
+        receives_tanf = person.spm_unit("il_tanf", period) > 0
+
+        return (
+            is_homeless
+            | is_in_foster_care
+            | has_iep
+            | is_deep_poverty
+            | receives_tanf
+        )
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_is_deep_poverty.py b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_is_deep_poverty.py
new file mode 100644
index 00000000000..b778968fb6a
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_is_deep_poverty.py
@@ -0,0 +1,23 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_is_deep_poverty(Variable):
+    value_type = bool
+    entity = Person
+    label = "Family income at or below 50% FPL (50-point factor for IL PFAE)"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        # Deep poverty (income <= 50% FPL) is a highest priority factor.
+        # Per the ISBE PDG enrollment form, Factor 4 includes "Family income at
+        # or below 50% of the federal poverty guidelines."
+        p = parameters(period).gov.states.il.isbe.pfae.eligibility.income
+        spm_unit = person.spm_unit
+        fpg = spm_unit("spm_unit_fpg", period)
+        income = spm_unit("il_isbe_countable_income", period)
+        threshold = fpg * p.deep_poverty_rate
+        return income <= threshold
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_is_low_income.py b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_is_low_income.py
new file mode 100644
index 00000000000..e1fc3ed7b73
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_is_low_income.py
@@ -0,0 +1,21 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_is_low_income(Variable):
+    value_type = bool
+    entity = Person
+    label = "Family income at or below 100% FPL (secondary priority factor)"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.states.il.isbe.pfae.eligibility.income
+        spm_unit = person.spm_unit
+        fpg = spm_unit("spm_unit_fpg", period)
+        income = spm_unit("il_isbe_countable_income", period)
+        threshold = fpg * p.low_income_rate
+        return income <= threshold
diff --git a/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_secondary_priority_factor_count.py b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_secondary_priority_factor_count.py
new file mode 100644
index 00000000000..f71e0169c5d
--- /dev/null
+++ b/policyengine_us/variables/gov/states/il/isbe/pfae/priority/il_pfae_secondary_priority_factor_count.py
@@ -0,0 +1,65 @@
+from policyengine_us.model_api import *
+
+
+class il_pfae_secondary_priority_factor_count(Variable):
+    value_type = int
+    entity = Person
+    label = "Number of secondary priority factors for Illinois PFAE"
+    definition_period = YEAR
+    reference = (
+        "https://www.isbe.net/pages/preschool-for-all.aspx",
+        "https://www.isbe.net/Documents/pdg-eg-grant-enrollment-form.pdf#page=2",
+    )
+    defined_for = StateCode.IL
+
+    def formula(person, period, parameters):
+        spm_unit = person.spm_unit
+        household = person.household
+
+        # Factor 5: Income <= 100% FPL
+        is_low_income = person("il_pfae_is_low_income", period)
+
+        # Factor 6: Parent didn't complete high school (Household-level variable)
+        parent_low_education = household(
+            "parent_has_less_than_high_school_education", period
+        )
+
+        # Factor 7: Teen parent at birth of first child
+        # Parent was under 20 when first child was born
+        was_teen_parent = spm_unit(
+            "il_isbe_was_teen_parent_at_first_birth", period
+        )
+
+        # Factor 8: Child or parent born outside US
+        born_outside_us = person("is_born_outside_us", period)
+        is_immigrant_family = spm_unit.any(born_outside_us)
+
+        # Factor 9: Non-English speaking home (Household-level variable)
+        is_non_english_home = household("is_non_english_speaking_home", period)
+
+        # Factor 10: Active Duty Military family
+        is_active_duty_military = person("military_basic_pay", period) > 0
+        is_military_family = spm_unit.any(is_active_duty_military)
+
+        # Factor 11: Developmental delay (without IEP)
+        has_developmental_delay = person("has_developmental_delay", period)
+        has_iep = person("has_individualized_education_program", period)
+        delay_without_iep = has_developmental_delay & ~has_iep
+
+        # Factor 12: No prior formal early learning
+        no_prior_learning = person(
+            "has_no_prior_formal_early_learning", period
+        )
+
+        factors = [
+            is_low_income,
+            parent_low_education,
+            was_teen_parent,
+            is_immigrant_family,
+            is_non_english_home,
+            is_military_family,
+            delay_without_iep,
+            no_prior_learning,
+        ]
+
+        return sum([f.astype(int) for f in factors])
diff --git a/policyengine_us/variables/household/demographic/geographic/is_non_english_speaking_home.py b/policyengine_us/variables/household/demographic/geographic/is_non_english_speaking_home.py
new file mode 100644
index 00000000000..b6259d13d0e
--- /dev/null
+++ b/policyengine_us/variables/household/demographic/geographic/is_non_english_speaking_home.py
@@ -0,0 +1,9 @@
+from policyengine_us.model_api import *
+
+
+class is_non_english_speaking_home(Variable):
+    value_type = bool
+    entity = Household
+    label = "Non-English speaking home"
+    definition_period = YEAR
+    documentation = "Whether the household's primary language is not English"
diff --git a/policyengine_us/variables/household/demographic/household/parent_has_less_than_high_school_education.py b/policyengine_us/variables/household/demographic/household/parent_has_less_than_high_school_education.py
new file mode 100644
index 00000000000..62d34ed1484
--- /dev/null
+++ b/policyengine_us/variables/household/demographic/household/parent_has_less_than_high_school_education.py
@@ -0,0 +1,9 @@
+from policyengine_us.model_api import *
+
+
+class parent_has_less_than_high_school_education(Variable):
+    value_type = bool
+    entity = Household
+    label = "Parent has less than high school education"
+    definition_period = YEAR
+    documentation = "Whether any parent or guardian in the household has less than a high school diploma or equivalent"
diff --git a/policyengine_us/variables/household/demographic/person/has_developmental_delay.py b/policyengine_us/variables/household/demographic/person/has_developmental_delay.py
new file mode 100644
index 00000000000..55a719dab6c
--- /dev/null
+++ b/policyengine_us/variables/household/demographic/person/has_developmental_delay.py
@@ -0,0 +1,9 @@
+from policyengine_us.model_api import *
+
+
+class has_developmental_delay(Variable):
+    value_type = bool
+    entity = Person
+    label = "Has a developmental delay"
+    definition_period = YEAR
+    documentation = "Whether the child has a screening-indicated developmental delay or disability"
diff --git a/policyengine_us/variables/household/demographic/person/has_individualized_education_program.py b/policyengine_us/variables/household/demographic/person/has_individualized_education_program.py
new file mode 100644
index 00000000000..3c104bdcd6c
--- /dev/null
+++ b/policyengine_us/variables/household/demographic/person/has_individualized_education_program.py
@@ -0,0 +1,9 @@
+from policyengine_us.model_api import *
+
+
+class has_individualized_education_program(Variable):
+    value_type = bool
+    entity = Person
+    label = "Has an Individualized Education Program (IEP)"
+    definition_period = YEAR
+    documentation = "Whether the child has an IEP under the Individuals with Disabilities Education Act (IDEA)"
diff --git a/policyengine_us/variables/household/demographic/person/has_no_prior_formal_early_learning.py b/policyengine_us/variables/household/demographic/person/has_no_prior_formal_early_learning.py
new file mode 100644
index 00000000000..6b3511e3fd4
--- /dev/null
+++ b/policyengine_us/variables/household/demographic/person/has_no_prior_formal_early_learning.py
@@ -0,0 +1,9 @@
+from policyengine_us.model_api import *
+
+
+class has_no_prior_formal_early_learning(Variable):
+    value_type = bool
+    entity = Person
+    label = "Has not previously participated in formal early learning"
+    definition_period = YEAR
+    documentation = "Whether the child has NOT previously participated in a formal early learning program (e.g., Head Start, preschool, licensed childcare)"
diff --git a/policyengine_us/variables/household/demographic/person/is_born_outside_us.py b/policyengine_us/variables/household/demographic/person/is_born_outside_us.py
new file mode 100644
index 00000000000..cb01cf439f4
--- /dev/null
+++ b/policyengine_us/variables/household/demographic/person/is_born_outside_us.py
@@ -0,0 +1,9 @@
+from policyengine_us.model_api import *
+
+
+class is_born_outside_us(Variable):
+    value_type = bool
+    entity = Person
+    label = "Was born outside the United States"
+    definition_period = YEAR
+    documentation = "Whether the person was born outside the United States"
diff --git a/uv.lock b/uv.lock
index f260826736c..16b92ccd8de 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1085,7 +1085,7 @@ wheels = [
 
 [[package]]
 name = "nbclient"
-version = "0.10.2"
+version = "0.10.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jupyter-client" },
@@ -1093,9 +1093,9 @@ dependencies = [
     { name = "nbformat" },
     { name = "traitlets" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/87/66/7ffd18d58eae90d5721f9f39212327695b749e23ad44b3881744eaf4d9e8/nbclient-0.10.2.tar.gz", hash = "sha256:90b7fc6b810630db87a6d0c2250b1f0ab4cf4d3c27a299b0cde78a4ed3fd9193", size = 62424, upload-time = "2024-12-19T10:32:27.164Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/8d/f3/1f6cf2ede4b026bc5f0b424cb41adf22f9c804e90a4dbd4fdb42291a35d5/nbclient-0.10.3.tar.gz", hash = "sha256:0baf171ee246e3bb2391da0635e719f27dc77d99aef59e0b04dcb935ee04c575", size = 62564, upload-time = "2025-12-19T15:50:09.331Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/34/6d/e7fa07f03a4a7b221d94b4d586edb754a9b0dc3c9e2c93353e9fa4e0d117/nbclient-0.10.2-py3-none-any.whl", hash = "sha256:4ffee11e788b4a27fabeb7955547e4318a5298f34342a4bfd01f2e1faaeadc3d", size = 25434, upload-time = "2024-12-19T10:32:24.139Z" },
+    { url = "https://files.pythonhosted.org/packages/b2/77/0c73678f5260501a271fd7342bee5d639440f2e9e07d590f1100a056d87c/nbclient-0.10.3-py3-none-any.whl", hash = "sha256:39e9bd403504dd2484dd0fd25235bb6a683ce8cd9873356e40d880696adc9e35", size = 25473, upload-time = "2025-12-19T15:50:07.671Z" },
 ]
 
 [[package]]
@@ -1519,7 +1519,7 @@ wheels = [
 
 [[package]]
 name = "policyengine-us"
-version = "1.465.3"
+version = "1.467.0"
 source = { editable = "." }
 dependencies = [
     { name = "microdf-python" },
@@ -2317,15 +2317,15 @@ wheels = [
 
 [[package]]
 name = "typer-slim"
-version = "0.20.0"
+version = "0.20.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "click" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/8e/45/81b94a52caed434b94da65729c03ad0fb7665fab0f7db9ee54c94e541403/typer_slim-0.20.0.tar.gz", hash = "sha256:9fc6607b3c6c20f5c33ea9590cbeb17848667c51feee27d9e314a579ab07d1a3", size = 106561, upload-time = "2025-10-20T17:03:46.642Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/3f/3d/6a4ec47010e8de34dade20c8e7bce90502b173f62a6b41619523a3fcf562/typer_slim-0.20.1.tar.gz", hash = "sha256:bb9e4f7e6dc31551c8a201383df322b81b0ce37239a5ead302598a2ebb6f7c9c", size = 106113, upload-time = "2025-12-19T16:48:54.206Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/5e/dd/5cbf31f402f1cc0ab087c94d4669cfa55bd1e818688b910631e131d74e75/typer_slim-0.20.0-py3-none-any.whl", hash = "sha256:f42a9b7571a12b97dddf364745d29f12221865acef7a2680065f9bb29c7dc89d", size = 47087, upload-time = "2025-10-20T17:03:44.546Z" },
+    { url = "https://files.pythonhosted.org/packages/d8/f9/a273c8b57c69ac1b90509ebda204972265fdc978fbbecc25980786f8c038/typer_slim-0.20.1-py3-none-any.whl", hash = "sha256:8e89c5dbaffe87a4f86f4c7a9e2f7059b5b68c66f558f298969d42ce34f10122", size = 47440, upload-time = "2025-12-19T16:48:52.678Z" },
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 [[package]]