Add the Scottish WFP (#1000)

* Fix Budget change reforms break on subset simulations #994

* Add the Scottish PAWHP

* Versioning

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), 
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.18.0] - 2024-12-05 12:43:06
+
+### Added
+
+- Scottish Winter Fuel Payment equivalent.
+
 ## [2.17.0] - 2024-12-04 16:48:42
 
 ### Fixed
@@ -1609,6 +1615,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 
+[2.18.0]: https://github.com/PolicyEngine/openfisca-uk/compare/2.17.0...2.18.0
 [2.17.0]: https://github.com/PolicyEngine/openfisca-uk/compare/2.16.0...2.17.0
 [2.16.0]: https://github.com/PolicyEngine/openfisca-uk/compare/2.15.1...2.16.0
 [2.15.1]: https://github.com/PolicyEngine/openfisca-uk/compare/2.15.0...2.15.1

changelog.yaml

@@ -1350,3 +1350,8 @@
     fixed:
     - Scottish baseline matched with Scottish Fiscal Commission.
   date: 2024-12-04 16:48:42
+- bump: minor
+  changes:
+    added:
+    - Scottish Winter Fuel Payment equivalent.
+  date: 2024-12-05 12:43:06

policyengine_uk/parameters/gov/social_security_scotland/pawhp/amount/base.yaml

@@ -0,0 +1,8 @@
+description: Amount paid to non-benefit-claiming pensioners for the PAWHP.
+values:
+  2024-01-01: 0
+  2025-01-01: 100
+metadata:
+  unit: currency-GBP
+  label: PAWHP base payment
+  uprating: gov.obr.consumer_price_index

policyengine_uk/parameters/gov/social_security_scotland/pawhp/amount/higher.yaml

@@ -0,0 +1,6 @@
+values:
+  2024-01-01: 300
+metadata:
+  unit: currency-GBP
+  label: PAWHP lower amount
+  uprating: gov.obr.consumer_price_index

policyengine_uk/parameters/gov/social_security_scotland/pawhp/amount/lower.yaml

@@ -0,0 +1,6 @@
+values:
+  2024-01-01: 200
+metadata:
+  unit: currency-GBP
+  label: PAWHP lower amount
+  uprating: gov.obr.consumer_price_index

policyengine_uk/parameters/gov/social_security_scotland/pawhp/eligibility/higher_age_requirement.yaml

@@ -0,0 +1,6 @@
+description: Age requirement to qualify for the higher PAWHP.
+values:
+  2000-01-01: 80
+metadata:
+  unit: year
+  label: Winter Fuel Payment higher amount age requirement

policyengine_uk/parameters/gov/social_security_scotland/pawhp/eligibility/require_benefits.yaml

@@ -0,0 +1,8 @@
+description: Whether receipt of means-tested benefits is required to qualify for the Winter Fuel Payment.
+values:
+  2000-01-01: false
+  2024-01-01: 
+    value: true
+metadata:
+  unit: bool
+  label: PAWHP means-tested benefits requirement

policyengine_uk/parameters/gov/social_security_scotland/pawhp/eligibility/state_pension_age_requirement.yaml

@@ -0,0 +1,6 @@
+description: Whether individuals must be State Pension Age to qualify for the PAWHP.
+values:
+  2000-01-01: true
+metadata:
+  unit: bool
+  label: PAWHP State Pension Age requirement

policyengine_uk/variables/gov/dwp/WFA.py

@@ -18,6 +18,9 @@ class winter_fuel_allowance(Variable):
     unit = GBP
 
     def formula(household, period, parameters):
+        in_scotland = (
+            household("country", period).decode_to_str() == "SCOTLAND"
+        )
         age = household.members("age", period)
         is_SP_age = household.members("is_SP_age", period)
         wfp = parameters(period).gov.dwp.winter_fuel_payment
@@ -53,7 +56,7 @@ def formula(household, period, parameters):
             & ~meets_higher_age_requirement
         )
 
-        return (
+        return ~in_scotland * (
             wfp.amount.higher * qualifies_for_higher
             + wfp.amount.lower * qualifies_for_lower
         )

policyengine_uk/variables/gov/gov_spending.py

@@ -40,6 +40,7 @@ class gov_spending(Variable):
         "cost_of_living_support_payment",
         "energy_bills_rebate",
         "winter_fuel_allowance",
+        "pawhp",
         "nhs_budget_change",
         "education_budget_change",
         "other_public_spending_budget_change",

policyengine_uk/variables/gov/social_security_scotland/pawhp.py

@@ -0,0 +1,56 @@
+from policyengine_uk.model_api import *
+
+
+class pawhp(Variable):
+    label = "Pension Age Winter Heating Payment"
+    entity = Household
+    definition_period = YEAR
+    value_type = float
+    unit = GBP
+
+    def formula(household, period, parameters):
+        in_scotland = (
+            household("country", period).decode_to_str() == "SCOTLAND"
+        )
+        age = household.members("age", period)
+        is_SP_age = household.members("is_SP_age", period)
+        wfp = parameters(period).gov.social_security_scotland.pawhp
+        on_mtb = (
+            add(
+                household,
+                period,
+                [
+                    "pension_credit",
+                    "income_support",
+                    "esa_income",
+                    "jsa_income",
+                ],
+            )
+            > 0
+        )
+        meets_mtb_requirement = on_mtb | ~wfp.eligibility.require_benefits
+        meets_spa_requirement = (
+            household.any(is_SP_age)
+            | ~wfp.eligibility.state_pension_age_requirement
+        )
+        meets_higher_age_requirement = household.any(
+            age >= wfp.eligibility.higher_age_requirement
+        )
+        qualifies_for_higher = (
+            meets_mtb_requirement
+            & meets_spa_requirement
+            & meets_higher_age_requirement
+        )
+        qualifies_for_lower = (
+            meets_mtb_requirement
+            & meets_spa_requirement
+            & ~meets_higher_age_requirement
+        )
+
+        qualifies_for_base = ~meets_mtb_requirement & meets_spa_requirement
+
+        return in_scotland * (
+            wfp.amount.higher * qualifies_for_higher
+            + wfp.amount.lower * qualifies_for_lower
+            + wfp.amount.base * qualifies_for_base
+        )

setup.py

@@ -4,7 +4,7 @@
 
 setup(
     name="PolicyEngine-UK",
-    version="2.17.0",
+    version="2.18.0",
     author="PolicyEngine",
     author_email="nikhil@policyengine.org",
     classifiers=[