diff --git a/lib/xrechnung.rb b/lib/xrechnung.rb
index 3b780c3..7ea9a95 100644
--- a/lib/xrechnung.rb
+++ b/lib/xrechnung.rb
@@ -32,6 +32,7 @@ class Document
 
     # Default customization specs
     DEFAULT_CUSTOMIZATION_ID = "urn:cen.eu:en16931:2017#compliant#urn:xoev-de:kosit:standard:xrechnung_2.3"
+    DEFAULT_PROFILE_ID = "urn:fdc:peppol.eu:2017:poacc:billing:01:1.0"
 
     # Document customization identifier
     #
@@ -39,6 +40,12 @@ class Document
     #   @return [String]
     member :customization_id, type: String, default: DEFAULT_CUSTOMIZATION_ID
 
+    # Document profile identifier
+    #
+    # @!attribute profile_id
+    #   @return [String]
+    member :profile_id, type: String, default: DEFAULT_PROFILE_ID
+
     # Invoice number BT-1
     #
     # Eine eindeutige Kennung der Rechnung, die diese im System des Verkäufers identifiziert.
@@ -265,6 +272,7 @@ def to_xml(indent: 2, target: "")
         "xmlns:xsi"          => "http://www.w3.org/2001/XMLSchema-instance",
         "xsi:schemaLocation" => "urn:oasis:names:specification:ubl:schema:xsd:Invoice-2 http://docs.oasis-open.org/ubl/os-UBL-2.1/xsd/maindoc/UBL-Invoice-2.1.xsd" do
         xml.cbc :CustomizationID, customization_id
+        xml.cbc :ProfileID, profile_id
         xml.cbc :ID, id
         xml.cbc :IssueDate, issue_date
         xml.cbc :DueDate, due_date
diff --git a/spec/fixtures/xrechnung.xml b/spec/fixtures/xrechnung.xml
index 154b8b2..4bfc741 100644
--- a/spec/fixtures/xrechnung.xml
+++ b/spec/fixtures/xrechnung.xml
@@ -2,6 +2,7 @@
 <!-- generated by https://xrechnungsgenerator.nortal.com/ -->
 <ubl:Invoice xmlns:ubl="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2 http://docs.oasis-open.org/ubl/os-UBL-2.1/xsd/maindoc/UBL-Invoice-2.1.xsd">
   <cbc:CustomizationID>urn:cen.eu:en16931:2017#compliant#urn:xoev-de:kosit:standard:xrechnung_2.3</cbc:CustomizationID>
+  <cbc:ProfileID>urn:fdc:peppol.eu:2017:poacc:billing:01:1.0</cbc:ProfileID>
   <cbc:ID>0815-99-1-a</cbc:ID>
   <cbc:IssueDate>2020-08-21</cbc:IssueDate>
   <cbc:DueDate>2020-08-31</cbc:DueDate>