diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb..0b3d54543 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,4 @@
+- bump: patch
+  changes:
+    fixed:
+      - Extended childcare entitlement hours expansion date corrected from 2026-01-01 to 2025-09-01 for children aged 9 months to 2 years, implementing the September 2025 policy change that doubled free childcare from 15 to 30 hours per week for working parents.
diff --git a/policyengine_uk/parameters/gov/dfe/extended_childcare_entitlement/hours.yaml b/policyengine_uk/parameters/gov/dfe/extended_childcare_entitlement/hours.yaml
index 2e4c7abfd..52c0fc0f9 100644
--- a/policyengine_uk/parameters/gov/dfe/extended_childcare_entitlement/hours.yaml
+++ b/policyengine_uk/parameters/gov/dfe/extended_childcare_entitlement/hours.yaml
@@ -19,13 +19,13 @@ brackets:
     amount:
       2015-01-01: 0
       2025-01-01: 15
-      2026-01-01: 30
+      2025-09-01: 30
   - threshold:
       2015-01-01: 2
     amount:
       2015-01-01: 0
       2024-01-01: 15
-      2026-01-01: 30
+      2025-09-01: 30
   - threshold:
       2015-01-01: 3
     amount:
diff --git a/policyengine_uk/tests/policy/baseline/gov/dfe/extended_childcare_entitlement/extended_childcare_entitlement.yaml b/policyengine_uk/tests/policy/baseline/gov/dfe/extended_childcare_entitlement/extended_childcare_entitlement.yaml
index 3087527d3..6aea879b3 100644
--- a/policyengine_uk/tests/policy/baseline/gov/dfe/extended_childcare_entitlement/extended_childcare_entitlement.yaml
+++ b/policyengine_uk/tests/policy/baseline/gov/dfe/extended_childcare_entitlement/extended_childcare_entitlement.yaml
@@ -12,13 +12,13 @@
   output:
     extended_childcare_entitlement: 6872.805
 
-- name: Eligible for 15 hours - All first conditions met
+- name: Eligible for 15 hours - 2 year old (evaluated at Jan 1, 2025 before Sept expansion)
   period: 2025
-  absolute_error_margin: 2
+  absolute_error_margin: 3
   input:
     people:
       child1:
-        age: 2  # Age 2 gets 15 hours
+        age: 2  # Age 2 gets 15 hours when evaluated at Jan 1, 2025
     benunits:
       benunit1:
         members: [child1]
@@ -42,11 +42,11 @@
 
 - name: Eligible for mixed hours - Family with multiple children
   period: 2025
-  absolute_error_margin: 4
+  absolute_error_margin: 6
   input:
     people:
       child1:
-        age: 2  # 15 hours
+        age: 2  # 15 hours at Jan 1, 2025
       child2:
         age: 3  # 30 hours
     benunits:
@@ -54,7 +54,7 @@
         members: [child1, child2]
         extended_childcare_entitlement_eligible: true
   output:
-    extended_childcare_entitlement: 11711.82
+    extended_childcare_entitlement: 11711.821
 
 - name: Not eligible - Family with multiple children but conditions not met
   period: 2025
@@ -74,11 +74,11 @@
 
 - name: Eligible with one working parent and one disabled parent
   period: 2025
-  absolute_error_margin: 6
+  absolute_error_margin: 9
   input:
     people:
       child1:
-        age: 2  # 15 hours
+        age: 2  # 15 hours at Jan 1, 2025
       child2:
         age: 3  # 30 hours
       child3:
@@ -89,7 +89,7 @@
         family_type: COUPLE_WITH_CHILDREN
         extended_childcare_entitlement_eligible: true
   output:
-    extended_childcare_entitlement: 18584.625
+    extended_childcare_entitlement: 18584.626
 
 - name: No expenses for zero hours
   period: 2025
@@ -126,7 +126,7 @@
   input:
     people:
       child1:
-        age: 2
+        age: 2  # Can get 15 hours at Jan 1, 2025, but only using 10
         max_free_entitlement_hours_used: 10
       child2:
         age: 3
@@ -187,6 +187,36 @@
       benunit1:
         members: [child1]
         extended_childcare_entitlement_eligible: true
-        maximum_extended_childcare_hours_usage: 18 
+        maximum_extended_childcare_hours_usage: 18
+  output:
+    extended_childcare_entitlement: 3436.402
+
+- name: Eligible for 30 hours - 2 year old after September 2025 expansion
+  period: 2026
+  absolute_error_margin: 3
+  input:
+    people:
+      child1:
+        age: 2  # Age 2 gets 30 hours from September 2025 onwards
+    benunits:
+      benunit1:
+        members: [child1]
+        extended_childcare_entitlement_eligible: true
+  output:
+    extended_childcare_entitlement: 10011.897
+
+- name: Eligible for 30 hours - Family with multiple 2-year-olds after expansion
+  period: 2026
+  absolute_error_margin: 6
+  input:
+    people:
+      child1:
+        age: 2  # 30 hours after September 2025
+      child2:
+        age: 3  # 30 hours
+    benunits:
+      benunit1:
+        members: [child1, child2]
+        extended_childcare_entitlement_eligible: true
   output:
-    extended_childcare_entitlement: 3436.402
\ No newline at end of file
+    extended_childcare_entitlement: 17121.797
\ No newline at end of file