Merge pull request #1140 from PolicyEngine/council_tax_projection

Update council tax uprating

Author: vahid-ahmadi

changelog_entry.yaml

@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    added:
+    - Council tax projection parameters from OBR data.

policyengine_uk/parameters/gov/obr/council_tax.yaml

@@ -0,0 +1,15 @@
+description: OBR forecast for council tax.
+values:
+  2023-01-01: 44.5
+  2024-01-01: 47.7
+  2025-01-01: 50.2
+  2026-01-01: 52.8
+  2027-01-01: 55.6
+  2028-01-01: 58.5
+  2029-01-01: 61.5
+metadata:
+  label: Council tax uprating
+  reference:
+    - title: OBR March 2025 EFO
+      href: https://obr.uk/efo/economic-and-fiscal-outlook-march-2025/
+      # Table A.5: Current receipt

policyengine_uk/variables/input/consumption/property/council_tax.py

@@ -9,4 +9,4 @@ class council_tax(Variable):
     definition_period = YEAR
     unit = GBP
     quantity_type = FLOW
-    uprating: str = "gov.obr.consumer_price_index"
+    uprating: str = "gov.obr.council_tax"