PolicyEngine · vahid-ahmadi · Jan 20, 2026 · Jan 20, 2026 · Jan 20, 2026 · Jan 20, 2026
diff --git a/changelog_entry.yaml b/changelog_entry.yaml
@@ -0,0 +1,6 @@
+- bump: minor
+  changes:
+    added:
+      - Scottish Child Payment rates from 2026-27 to 2030-31 per Scottish Fiscal Commission forecasts.
+      - Scottish Child Payment baby boost under-1 total from 2027-28 to 2030-31 per SFC forecasts.
+      - CPI uprating for SCP parameters for projections beyond 2030-31.
diff --git a/policyengine_uk/parameters/gov/contrib/scotland/scottish_child_payment/under_one.yaml b/policyengine_uk/parameters/gov/contrib/scotland/scottish_child_payment/under_one.yaml
@@ -1,11 +1,17 @@
 description: Total weekly Scottish Child Payment amount for children under 1.
 values:
   0001-01-01: 0
-  2027-04-01: 40
+  2027-04-01: 40.00
+  2028-04-01: 40.80
+  2029-04-01: 41.65
+  2030-04-01: 42.50
 metadata:
   unit: currency-GBP
   period: week
   label: Scottish Child Payment total for under-1s
+  uprating: gov.economic_assumptions.indices.obr.consumer_price_index
   reference:
     - title: Scottish Budget 2026 to 2027
       href: https://www.gov.scot/publications/scottish-budget-2026-2027/pages/6/
+    - title: Scottish Fiscal Commission - Scotland's Economic and Fiscal Forecasts January 2026
+      href: https://fiscalcommission.scot/wp-content/uploads/2026/01/Scotlands-Economic-and-Fiscal-Forecasts-January-2026-revised-13-01-2026.pdf
diff --git a/policyengine_uk/parameters/gov/hmrc/fuel_duty/calculate_fuel_duty_rates.py b/policyengine_uk/parameters/gov/hmrc/fuel_duty/calculate_fuel_duty_rates.py
@@ -18,7 +18,6 @@
 
 import yaml
 
-
 # Years to calculate rates for
 CALCULATION_YEARS = range(2026, 2031)
 

diff --git a/policyengine_uk/parameters/gov/social_security_scotland/scottish_child_payment/amount.yaml b/policyengine_uk/parameters/gov/social_security_scotland/scottish_child_payment/amount.yaml
@@ -6,12 +6,20 @@ values:
   2022-11-14: 25
   2024-04-01: 26.70
   2025-04-01: 27.15
+  2026-04-01: 28.20
+  2027-04-01: 28.85
+  2028-04-01: 29.45
+  2029-04-01: 30.05
+  2030-04-01: 30.65
 metadata:
   unit: currency-GBP
   period: week
   label: Scottish Child Payment weekly amount
+  uprating: gov.economic_assumptions.indices.obr.consumer_price_index
   reference:
     - title: The Scottish Child Payment Regulations 2020, Regulation 20
       href: https://www.legislation.gov.uk/ssi/2020/351/regulation/20
     - title: Scottish Government - Scottish Child Payment
       href: https://www.gov.scot/policies/social-security/scottish-child-payment/
+    - title: Scottish Fiscal Commission - Scotland's Economic and Fiscal Forecasts January 2026
+      href: https://fiscalcommission.scot/wp-content/uploads/2026/01/Scotlands-Economic-and-Fiscal-Forecasts-January-2026-revised-13-01-2026.pdf
diff --git a/policyengine_uk/tests/microsimulation/test_reform_impacts.py b/policyengine_uk/tests/microsimulation/test_reform_impacts.py
@@ -8,7 +8,6 @@
 from pathlib import Path
 from policyengine_uk import Microsimulation
 
-
 # Load configuration from YAML file
 config_path = Path(__file__).parent / "reforms_config.yaml"
 with open(config_path, "r") as f:

diff --git a/policyengine_uk/tests/microsimulation/test_salary_sacrifice_cap_reform.py b/policyengine_uk/tests/microsimulation/test_salary_sacrifice_cap_reform.py
@@ -20,7 +20,6 @@
 import pandas as pd
 from policyengine_uk import Microsimulation
 
-
 # Policy year when the salary sacrifice cap takes effect
 POLICY_YEAR = 2030  # Use 2030 to ensure cap is active (cap starts 2029-04-06)
 

diff --git a/...yengine_uk/tests/policy/baseline/gov/social_security_scotland/scottish_child_payment.yaml b/...yengine_uk/tests/policy/baseline/gov/social_security_scotland/scottish_child_payment.yaml
@@ -255,6 +255,72 @@
     # [parent, child_1]
     scottish_child_payment: [0, 1412]
 
+- name: SCP with 2026 amount (£28.20/week)
+  period: 2026
+  absolute_error_margin: 10
+  input:
+    people:
+      parent:
+        age: 30
+      child_1:
+        age: 5
+    benunits:
+      benunit:
+        members: [parent, child_1]
+        universal_credit: 5000
+    households:
+      household:
+        members: [parent, child_1]
+        region: SCOTLAND
+  output:
+    # £28.20/week * 52 weeks = £1,466.40
+    # [parent, child_1]
+    scottish_child_payment: [0, 1466]
+
+- name: SCP with 2027 amount (£28.85/week)
+  period: 2027
+  absolute_error_margin: 10
+  input:
+    people:
+      parent:
+        age: 30
+      child_1:
+        age: 5
+    benunits:
+      benunit:
+        members: [parent, child_1]
+        universal_credit: 5000
+    households:
+      household:
+        members: [parent, child_1]
+        region: SCOTLAND
+  output:
+    # £28.85/week * 52 weeks = £1,500.20
+    # [parent, child_1]
+    scottish_child_payment: [0, 1500]
+
+- name: SCP with 2028 amount (£29.45/week)
+  period: 2028
+  absolute_error_margin: 10
+  input:
+    people:
+      parent:
+        age: 30
+      child_1:
+        age: 5
+    benunits:
+      benunit:
+        members: [parent, child_1]
+        universal_credit: 5000
+    households:
+      household:
+        members: [parent, child_1]
+        region: SCOTLAND
+  output:
+    # £29.45/week * 52 weeks = £1,531.40
+    # [parent, child_1]
+    scottish_child_payment: [0, 1531]
+
 - name: CTC no longer qualifies from 2025 (after April 2024)
   period: 2025
   absolute_error_margin: 1

diff --git a/policyengine_uk/tests/policy/reforms/scp_baby_bonus/scottish_child_payment_baby_bonus.yaml b/policyengine_uk/tests/policy/reforms/scp_baby_bonus/scottish_child_payment_baby_bonus.yaml
@@ -24,10 +24,10 @@
         members: [parent, baby]
         region: SCOTLAND
   output:
-    # Under-1s get £40/week total (policy parameter)
-    # £40/week * 52 weeks = £2,080 per year
+    # Under-1s get £40.80/week total (2028-29 SFC forecast)
+    # £40.80/week * 52 weeks = £2,121.60 per year
     # [parent, baby]
-    scottish_child_payment: [0, 2080]
+    scottish_child_payment: [0, 2122]
 
 - name: SCP baby bonus - child over 1 gets standard rate (2028)
   period: 2028
@@ -49,9 +49,9 @@
         members: [parent, toddler]
         region: SCOTLAND
   output:
-    # Standard rate only: £27.15/week * 52 = £1,411.80
+    # Standard rate only: £29.45/week * 52 = £1,531.40
     # [parent, toddler]
-    scottish_child_payment: [0, 1412]
+    scottish_child_payment: [0, 1531]
 
 - name: SCP baby bonus - mixed ages (2028)
   period: 2028
@@ -75,10 +75,10 @@
         members: [parent, baby, older_child]
         region: SCOTLAND
   output:
-    # Baby (age 0): £40/week total * 52 = £2,080
-    # Older child (age 5): £27.15/week * 52 = £1,411.80
+    # Baby (age 0): £40.80/week total * 52 = £2,121.60
+    # Older child (age 5): £29.45/week * 52 = £1,531.40
     # [parent, baby, older_child]
-    scottish_child_payment: [0, 2080, 1412]
+    scottish_child_payment: [0, 2122, 1531]
 
 - name: SCP baby bonus - not in Scotland (2028)
   period: 2028

diff --git a/policyengine_uk/tests/test_behavioral_responses.py b/policyengine_uk/tests/test_behavioral_responses.py
@@ -16,7 +16,6 @@
 from policyengine_uk import Microsimulation
 from policyengine_uk.model_api import Scenario
 
-
 # Check if HF token is available for data-dependent tests
 HF_TOKEN_AVAILABLE = bool(os.environ.get("HUGGING_FACE_TOKEN"))
 requires_hf_data = pytest.mark.skipif(

diff --git a/policyengine_uk/utils/dependencies.py b/policyengine_uk/utils/dependencies.py
@@ -179,14 +179,12 @@ def create_waterfall_change_chart(
 
 
 def add_fonts():
-    fonts = HTML(
-        """
+    fonts = HTML("""
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Roboto+Serif:ital,opsz,wght@0,8..144,100..900;1,8..144,100..900&display=swap" rel="stylesheet">
     <link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:ital,wght@0,100..700;1,100..700&display=swap" rel="stylesheet">
-    """
-    )
+    """)
     return display_html(fonts)
 
 

diff --git a/policyengine_uk/variables/gov/hmrc/fuel_duty/fuel_duty.py b/policyengine_uk/variables/gov/hmrc/fuel_duty/fuel_duty.py
@@ -1,6 +1,5 @@
 from policyengine_uk.model_api import *
 
-
 STATUTORY_CONSUMER_INCIDENCE = 0.5
 ECONOMIC_CONSUMER_INCIDENCE = 1
 

diff --git a/policyengine_uk/variables/gov/hmrc/income_tax/reliefs/loss_relief.py b/policyengine_uk/variables/gov/hmrc/income_tax/reliefs/loss_relief.py
@@ -1,6 +1,5 @@
 from policyengine_uk.model_api import *
 
-
 """
 The section detailing some tax reliefs applicable is section 24 of the Act, but others are described in the 2003 and 2005 Acts as deductions from the respective components.
 """
Original file line number	Diff line number	Diff line change
Expand Up		@@ -18,7 +18,6 @@

		import yaml


		# Years to calculate rates for
		CALCULATION_YEARS = range(2026, 2031)

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