MaxGhenis · Oct 25, 2026 · Oct 9, 2026 · Oct 9, 2026 · Oct 9, 2026 · Oct 23, 2026
diff --git a/changelog.d/hb-pensioner-history.fixed.md b/changelog.d/hb-pensioner-history.fixed.md
@@ -0,0 +1 @@
+- Corrected the higher pension-age Housing Benefit personal allowances for 2015 to 2018, retaining the 2019 rates from 2019.
diff --git a/changelog.d/hb-under-65-history.fixed.md b/changelog.d/hb-under-65-history.fixed.md
@@ -0,0 +1 @@
+- Use the separate historical under-65 pensioner Housing Benefit allowances, with jurisdiction-specific category end dates and the existing annual sampling convention.
diff --git a/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/couple/aged.yaml b/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/couple/aged.yaml
@@ -1,8 +1,36 @@
-description: Personal allowance for Housing Benefit for a couple where one or both members attained State Pension age before 1 April 2021 (and, before that date, every couple with a member over State Pension age).
+description: Personal allowance for Housing Benefit for a couple where one or both members attained State Pension age before 1 April 2021 (before that date, every couple with a member over State Pension age except, until 6 December 2018, one where both members were under 65).
 values:
-  # 2020-21 to 2026-27: DWP Benefit and pension rates (gov.uk), each
-  # year's rate as listed in that year's publication.
-  2015-04-01: 270.6
+  # 2015-16 to 2019-20: the rate set by the instrument cited at each value
+  # (to 2018-19, the aged-65-or-over rate; younger claimants got
+  # aged_under_65). 2020-21 to 2026-27: DWP Benefit and pension rates
+  # (gov.uk), each year's rate as listed in that year's publication.
+  2015-04-01:
+    value: 248.3
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2015, Schedule 7
+        href: https://www.legislation.gov.uk/uksi/2015/457/schedule/7/made
+  2016-04-01:
+    value: 252.3
+    reference:
+      - title: The Social Security Benefits (Adjustment of Amounts and Thresholds) Regulations 2016, regulation 6
+        href: https://www.legislation.gov.uk/uksi/2016/242/regulation/6/made
+  2017-04-01:
+    value: 258.15
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2017, Schedule 7
+        href: https://www.legislation.gov.uk/uksi/2017/260/schedule/7/made
+  2018-04-01:
+    value: 263.8
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2018, Schedule 6
+        href: https://www.legislation.gov.uk/uksi/2018/281/schedule/6/made
+  2019-04-01:
+    value: 270.6
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2019, Schedule 4
+        href: https://www.legislation.gov.uk/uksi/2019/480/schedule/4/made
+      - title: The Social Security Benefits Up-rating Order (Northern Ireland) 2019, Schedule 4
+        href: https://www.legislation.gov.uk/nisr/2019/58/made
   2020-04-01: 280.85
   2021-04-01: 286.05
   2022-04-06: 294.9

diff --git a/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/couple/aged_under_65.yaml b/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/couple/aged_under_65.yaml
@@ -0,0 +1,64 @@
+description: Historical lower Housing Benefit pensioner allowance for couple families below age 65.
+amount:
+  description: Weekly allowance for the former qualifying under-65 pensioner category.
+  values:
+    2015-04-01:
+      value: 230.85
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2015
+          href: https://www.legislation.gov.uk/uksi/2015/457/schedule/7/made
+        - title: NI pensioner Housing Benefit allowances, 2015
+          href: https://www.legislation.gov.uk/nisr/2015/124/schedule/7/made
+    2016-04-01:
+      value: 237.55
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2016
+          href: https://www.legislation.gov.uk/uksi/2016/242/regulation/6/made
+        - title: NI pensioner Housing Benefit allowances, 2016
+          href: https://www.legislation.gov.uk/nisr/2016/110/regulation/6/made
+    2017-04-01:
+      value: 243.25
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2017
+          href: https://www.legislation.gov.uk/uksi/2017/260/schedule/7/made
+        - title: NI pensioner Housing Benefit allowances, 2017
+          href: https://www.legislation.gov.uk/nisr/2017/56/schedule/7/made
+    2018-04-01:
+      value: 248.8
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2018
+          href: https://www.legislation.gov.uk/uksi/2018/281/schedule/6/made
+        - title: NI pensioner Housing Benefit allowances, 2018
+          href: https://www.legislation.gov.uk/nisr/2018/58/schedule/6/made
+  metadata:
+    unit: currency-GBP
+    period: week
+    label: Housing Benefit historical lower couple allowance
+age_limit_great_britain:
+  description: Upper age boundary for the former GB pensioner allowance category; zero after its removal.
+  values:
+    2015-04-01: 65
+    2018-12-06:
+      value: 0
+      reference:
+        - title: Social Security (Miscellaneous Amendments No. 5) Regulations 2017, regulations 1(2)(b) and 7(7)
+          href: https://www.legislation.gov.uk/uksi/2017/1187/made
+  metadata:
+    unit: year
+    label: Historical lower GB pensioner allowance age limit
+age_limit_northern_ireland:
+  description: Upper age boundary for the former NI pensioner allowance category; zero after its removal.
+  values:
+    2015-04-01: 65
+    # SR 2017/242 reg 7(7) omits paragraph (a) of entries (1) and (2), and entry
+    # (3), from the Schedule 4 para 1 table, from 6 December 2018 (reg 1(2)(b)),
+    # as SI 2017/1187 does in Great Britain. The 2019 up-rating table (SR 2019/58)
+    # no longer has the category.
+    2018-12-06:
+      value: 0
+      reference:
+        - title: Social Security (Miscellaneous Amendments No. 3) Regulations (Northern Ireland) 2017, regulations 1(2)(b) and 7(7)
+          href: https://www.legislation.gov.uk/nisr/2017/242/made
+  metadata:
+    unit: year
+    label: Historical lower NI pensioner allowance age limit
diff --git a/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/lone_parent/aged.yaml b/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/lone_parent/aged.yaml
@@ -1,9 +1,37 @@
-description: Personal allowance for Housing Benefit for a lone parent who attained State Pension age before 1 April 2021 (and, before that date, every pension-age lone parent).
+description: Personal allowance for Housing Benefit for a lone parent who attained State Pension age before 1 April 2021 (before that date, every pension-age lone parent except, until 6 December 2018, one under 65).
 
 values:
-  # 2020-21 to 2026-27: DWP Benefit and pension rates (gov.uk), each
-  # year's rate as listed in that year's publication.
-  2015-04-01: 181
+  # 2015-16 to 2019-20: the rate set by the instrument cited at each value
+  # (to 2018-19, the aged-65-or-over rate; younger claimants got
+  # aged_under_65). 2020-21 to 2026-27: DWP Benefit and pension rates
+  # (gov.uk), each year's rate as listed in that year's publication.
+  2015-04-01:
+    value: 166.05
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2015, Schedule 7
+        href: https://www.legislation.gov.uk/uksi/2015/457/schedule/7/made
+  2016-04-01:
+    value: 168.7
+    reference:
+      - title: The Social Security Benefits (Adjustment of Amounts and Thresholds) Regulations 2016, regulation 6
+        href: https://www.legislation.gov.uk/uksi/2016/242/regulation/6/made
+  2017-04-01:
+    value: 172.55
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2017, Schedule 7
+        href: https://www.legislation.gov.uk/uksi/2017/260/schedule/7/made
+  2018-04-01:
+    value: 176.4
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2018, Schedule 6
+        href: https://www.legislation.gov.uk/uksi/2018/281/schedule/6/made
+  2019-04-01:
+    value: 181
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2019, Schedule 4
+        href: https://www.legislation.gov.uk/uksi/2019/480/schedule/4/made
+      - title: The Social Security Benefits Up-rating Order (Northern Ireland) 2019, Schedule 4
+        href: https://www.legislation.gov.uk/nisr/2019/58/made
   2020-04-01: 187.75
   2021-04-01: 191.15
   2022-04-06: 197.1

diff --git a/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/lone_parent/aged_under_65.yaml b/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/lone_parent/aged_under_65.yaml
@@ -0,0 +1,64 @@
+description: Historical lower Housing Benefit pensioner allowance for lone parent families below age 65.
+amount:
+  description: Weekly allowance for the former qualifying under-65 pensioner category.
+  values:
+    2015-04-01:
+      value: 151.2
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2015
+          href: https://www.legislation.gov.uk/uksi/2015/457/schedule/7/made
+        - title: NI pensioner Housing Benefit allowances, 2015
+          href: https://www.legislation.gov.uk/nisr/2015/124/schedule/7/made
+    2016-04-01:
+      value: 155.6
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2016
+          href: https://www.legislation.gov.uk/uksi/2016/242/regulation/6/made
+        - title: NI pensioner Housing Benefit allowances, 2016
+          href: https://www.legislation.gov.uk/nisr/2016/110/regulation/6/made
+    2017-04-01:
+      value: 159.35
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2017
+          href: https://www.legislation.gov.uk/uksi/2017/260/schedule/7/made
+        - title: NI pensioner Housing Benefit allowances, 2017
+          href: https://www.legislation.gov.uk/nisr/2017/56/schedule/7/made
+    2018-04-01:
+      value: 163
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2018
+          href: https://www.legislation.gov.uk/uksi/2018/281/schedule/6/made
+        - title: NI pensioner Housing Benefit allowances, 2018
+          href: https://www.legislation.gov.uk/nisr/2018/58/schedule/6/made
+  metadata:
+    unit: currency-GBP
+    period: week
+    label: Housing Benefit historical lower lone parent allowance
+age_limit_great_britain:
+  description: Upper age boundary for the former GB pensioner allowance category; zero after its removal.
+  values:
+    2015-04-01: 65
+    2018-12-06:
+      value: 0
+      reference:
+        - title: Social Security (Miscellaneous Amendments No. 5) Regulations 2017, regulations 1(2)(b) and 7(7)
+          href: https://www.legislation.gov.uk/uksi/2017/1187/made
+  metadata:
+    unit: year
+    label: Historical lower GB pensioner allowance age limit
+age_limit_northern_ireland:
+  description: Upper age boundary for the former NI pensioner allowance category; zero after its removal.
+  values:
+    2015-04-01: 65
+    # SR 2017/242 reg 7(7) omits paragraph (a) of entries (1) and (2), and entry
+    # (3), from the Schedule 4 para 1 table, from 6 December 2018 (reg 1(2)(b)),
+    # as SI 2017/1187 does in Great Britain. The 2019 up-rating table (SR 2019/58)
+    # no longer has the category.
+    2018-12-06:
+      value: 0
+      reference:
+        - title: Social Security (Miscellaneous Amendments No. 3) Regulations (Northern Ireland) 2017, regulations 1(2)(b) and 7(7)
+          href: https://www.legislation.gov.uk/nisr/2017/242/made
+  metadata:
+    unit: year
+    label: Historical lower NI pensioner allowance age limit
diff --git a/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/single/aged.yaml b/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/single/aged.yaml
@@ -1,8 +1,36 @@
-description: Personal allowance for Housing Benefit for a single claimant who attained State Pension age before 1 April 2021 (and, before that date, every single pension-age claimant).
+description: Personal allowance for Housing Benefit for a single claimant who attained State Pension age before 1 April 2021 (before that date, every single pension-age claimant except, until 6 December 2018, one under 65).
 values:
-  # 2020-21 to 2026-27: DWP Benefit and pension rates (gov.uk), each
-  # year's rate as listed in that year's publication.
-  2015-04-01: 181
+  # 2015-16 to 2019-20: the rate set by the instrument cited at each value
+  # (to 2018-19, the aged-65-or-over rate; younger claimants got
+  # aged_under_65). 2020-21 to 2026-27: DWP Benefit and pension rates
+  # (gov.uk), each year's rate as listed in that year's publication.
+  2015-04-01:
+    value: 166.05
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2015, Schedule 7
+        href: https://www.legislation.gov.uk/uksi/2015/457/schedule/7/made
+  2016-04-01:
+    value: 168.7
+    reference:
+      - title: The Social Security Benefits (Adjustment of Amounts and Thresholds) Regulations 2016, regulation 6
+        href: https://www.legislation.gov.uk/uksi/2016/242/regulation/6/made
+  2017-04-01:
+    value: 172.55
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2017, Schedule 7
+        href: https://www.legislation.gov.uk/uksi/2017/260/schedule/7/made
+  2018-04-01:
+    value: 176.4
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2018, Schedule 6
+        href: https://www.legislation.gov.uk/uksi/2018/281/schedule/6/made
+  2019-04-01:
+    value: 181
+    reference:
+      - title: The Social Security Benefits Up-rating Order 2019, Schedule 4
+        href: https://www.legislation.gov.uk/uksi/2019/480/schedule/4/made
+      - title: The Social Security Benefits Up-rating Order (Northern Ireland) 2019, Schedule 4
+        href: https://www.legislation.gov.uk/nisr/2019/58/made
   2020-04-01: 187.75
   2021-04-01: 191.15
   2022-04-06: 197.1

diff --git a/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/single/aged_under_65.yaml b/policyengine_uk/parameters/gov/dwp/housing_benefit/allowances/single/aged_under_65.yaml
@@ -0,0 +1,64 @@
+description: Historical lower Housing Benefit pensioner allowance for single families below age 65.
+amount:
+  description: Weekly allowance for the former qualifying under-65 pensioner category.
+  values:
+    2015-04-01:
+      value: 151.2
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2015
+          href: https://www.legislation.gov.uk/uksi/2015/457/schedule/7/made
+        - title: NI pensioner Housing Benefit allowances, 2015
+          href: https://www.legislation.gov.uk/nisr/2015/124/schedule/7/made
+    2016-04-01:
+      value: 155.6
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2016
+          href: https://www.legislation.gov.uk/uksi/2016/242/regulation/6/made
+        - title: NI pensioner Housing Benefit allowances, 2016
+          href: https://www.legislation.gov.uk/nisr/2016/110/regulation/6/made
+    2017-04-01:
+      value: 159.35
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2017
+          href: https://www.legislation.gov.uk/uksi/2017/260/schedule/7/made
+        - title: NI pensioner Housing Benefit allowances, 2017
+          href: https://www.legislation.gov.uk/nisr/2017/56/schedule/7/made
+    2018-04-01:
+      value: 163
+      reference:
+        - title: GB pensioner Housing Benefit allowances, 2018
+          href: https://www.legislation.gov.uk/uksi/2018/281/schedule/6/made
+        - title: NI pensioner Housing Benefit allowances, 2018
+          href: https://www.legislation.gov.uk/nisr/2018/58/schedule/6/made
+  metadata:
+    unit: currency-GBP
+    period: week
+    label: Housing Benefit historical lower single allowance
+age_limit_great_britain:
+  description: Upper age boundary for the former GB pensioner allowance category; zero after its removal.
+  values:
+    2015-04-01: 65
+    2018-12-06:
+      value: 0
+      reference:
+        - title: Social Security (Miscellaneous Amendments No. 5) Regulations 2017, regulations 1(2)(b) and 7(7)
+          href: https://www.legislation.gov.uk/uksi/2017/1187/made
+  metadata:
+    unit: year
+    label: Historical lower GB pensioner allowance age limit
+age_limit_northern_ireland:
+  description: Upper age boundary for the former NI pensioner allowance category; zero after its removal.
+  values:
+    2015-04-01: 65
+    # SR 2017/242 reg 7(7) omits paragraph (a) of entries (1) and (2), and entry
+    # (3), from the Schedule 4 para 1 table, from 6 December 2018 (reg 1(2)(b)),
+    # as SI 2017/1187 does in Great Britain. The 2019 up-rating table (SR 2019/58)
+    # no longer has the category.
+    2018-12-06:
+      value: 0
+      reference:
+        - title: Social Security (Miscellaneous Amendments No. 3) Regulations (Northern Ireland) 2017, regulations 1(2)(b) and 7(7)
+          href: https://www.legislation.gov.uk/nisr/2017/242/made
+  metadata:
+    unit: year
+    label: Historical lower NI pensioner allowance age limit
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		- Corrected the higher pension-age Housing Benefit personal allowances for 2015 to 2018, retaining the 2019 rates from 2019.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		- Use the separate historical under-65 pensioner Housing Benefit allowances, with jurisdiction-specific category end dates and the existing annual sampling convention.