anth-volk · Oct 9, 2026 · Oct 9, 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
@@ -1,6 +1,26 @@
 description: The following couple personal allowance is provided under the Housing Benefit if at least one member is over the state pension age threshold.
 values:
-  2015-04-01: 270.6
+  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: 270.6
   2021-04-01: 286.05
   2022-04-06: 294.9
   2023-04-01: 324.7

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 +1,60 @@
+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 in the April 2019 replacement table.
+  values:
+    2015-04-01: 65
+    2019-04-01:
+      value: 0
+      reference:
+        - title: NI Social Security Benefits Up-rating Order 2019, articles 1 and 24 and Schedule 4
+          href: https://www.legislation.gov.uk/nisr/2019/58/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
@@ -1,7 +1,27 @@
 description: Personal allowance for Housing Benefit for a lone parent over State Pension age.
 
 values:
-  2015-04-01: 181
+  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: 181
   2021-04-01: 191.15
   2022-04-06: 197.1
   2023-04-01: 217

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 +1,60 @@
+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 in the April 2019 replacement table.
+  values:
+    2015-04-01: 65
+    2019-04-01:
+      value: 0
+      reference:
+        - title: NI Social Security Benefits Up-rating Order 2019, articles 1 and 24 and Schedule 4
+          href: https://www.legislation.gov.uk/nisr/2019/58/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
@@ -1,6 +1,26 @@
 description: The following personal allowance amount is provided to single filers over the pension age under the Housing Benefit.
 values:
-  2015-04-01: 181
+  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: 181
   2021-04-01: 191.15
   2022-04-06: 197.1
   2023-04-01: 217

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 +1,60 @@
+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 in the April 2019 replacement table.
+  values:
+    2015-04-01: 65
+    2019-04-01:
+      value: 0
+      reference:
+        - title: NI Social Security Benefits Up-rating Order 2019, articles 1 and 24 and Schedule 4
+          href: https://www.legislation.gov.uk/nisr/2019/58/made
+  metadata:
+    unit: year
+    label: Historical lower NI pensioner allowance age limit
diff --git a/...cy/baseline/finance/benefit/family/housing_benefit/housing_benefit_applicable_amount.yaml b/...cy/baseline/finance/benefit/family/housing_benefit/housing_benefit_applicable_amount.yaml
@@ -115,3 +115,106 @@
         benefits_premiums: 0
   output:
     housing_benefit_applicable_amount: 108.3 * 52
+
+- name: "Historical 2015 lower/higher pensioner allowances in GB and NI"
+  period: 2015
+  absolute_error_margin: 0.02
+  input:
+    country: ["ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND"]
+    housing_benefit_eligible: [true,true,true,true,true,true,true,true,true,true,true,true]
+    housing_benefit_pension_age_regulations_apply: [true,true,true,true,true,true,true,true,true,true,true,true]
+    eldest_claimant_or_partner_age: [64,65,64,65,64,65,64,65,64,65,64,65]
+    is_single_person: [true,true,false,false,false,false,true,true,false,false,false,false]
+    is_lone_parent: [false,false,true,true,false,false,false,false,true,true,false,false]
+    is_couple: [false,false,false,false,true,true,false,false,false,false,true,true]
+    benefits_premiums: [0,0,0,0,0,0,0,0,0,0,0,0]
+  output:
+    housing_benefit_applicable_amount: [7862.4,8634.6,7862.4,8634.6,12004.199999999999,12911.6,7862.4,8634.6,7862.4,8634.6,12004.199999999999,12911.6]
+
+- name: "Historical 2016 lower/higher pensioner allowances in GB and NI"
+  period: 2016
+  absolute_error_margin: 0.02
+  input:
+    country: ["ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND"]
+    housing_benefit_eligible: [true,true,true,true,true,true,true,true,true,true,true,true]
+    housing_benefit_pension_age_regulations_apply: [true,true,true,true,true,true,true,true,true,true,true,true]
+    eldest_claimant_or_partner_age: [64,65,64,65,64,65,64,65,64,65,64,65]
+    is_single_person: [true,true,false,false,false,false,true,true,false,false,false,false]
+    is_lone_parent: [false,false,true,true,false,false,false,false,true,true,false,false]
+    is_couple: [false,false,false,false,true,true,false,false,false,false,true,true]
+    benefits_premiums: [0,0,0,0,0,0,0,0,0,0,0,0]
+  output:
+    housing_benefit_applicable_amount: [8091.2,8772.4,8091.2,8772.4,12352.6,13119.6,8091.2,8772.4,8091.2,8772.4,12352.6,13119.6]
+
+- name: "Historical 2017 lower/higher pensioner allowances in GB and NI"
+  period: 2017
+  absolute_error_margin: 0.02
+  input:
+    country: ["ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND"]
+    housing_benefit_eligible: [true,true,true,true,true,true,true,true,true,true,true,true]
+    housing_benefit_pension_age_regulations_apply: [true,true,true,true,true,true,true,true,true,true,true,true]
+    eldest_claimant_or_partner_age: [64,65,64,65,64,65,64,65,64,65,64,65]
+    is_single_person: [true,true,false,false,false,false,true,true,false,false,false,false]
+    is_lone_parent: [false,false,true,true,false,false,false,false,true,true,false,false]
+    is_couple: [false,false,false,false,true,true,false,false,false,false,true,true]
+    benefits_premiums: [0,0,0,0,0,0,0,0,0,0,0,0]
+  output:
+    housing_benefit_applicable_amount: [8286.199999999999,8972.6,8286.199999999999,8972.6,12649,13423.8,8286.199999999999,8972.6,8286.199999999999,8972.6,12649,13423.8]
+
+- name: "Historical 2018 lower/higher pensioner allowances in GB and NI"
+  period: 2018
+  absolute_error_margin: 0.02
+  input:
+    country: ["ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","ENGLAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND","NORTHERN_IRELAND"]
+    housing_benefit_eligible: [true,true,true,true,true,true,true,true,true,true,true,true]
+    housing_benefit_pension_age_regulations_apply: [true,true,true,true,true,true,true,true,true,true,true,true]
+    eldest_claimant_or_partner_age: [64,65,64,65,64,65,64,65,64,65,64,65]
+    is_single_person: [true,true,false,false,false,false,true,true,false,false,false,false]
+    is_lone_parent: [false,false,true,true,false,false,false,false,true,true,false,false]
+    is_couple: [false,false,false,false,true,true,false,false,false,false,true,true]
+    benefits_premiums: [0,0,0,0,0,0,0,0,0,0,0,0]
+  output:
+    housing_benefit_applicable_amount: [8476,9172.800000000001,8476,9172.800000000001,12937.6,13717.6,8476,9172.800000000001,8476,9172.800000000001,12937.6,13717.6]
+
+- name: "Both jurisdictions use the higher category after abolition under annual sampling"
+  period: 2019
+  absolute_error_margin: 0.02
+  input:
+    country: ["ENGLAND","NORTHERN_IRELAND"]
+    housing_benefit_eligible: [true,true]
+    housing_benefit_pension_age_regulations_apply: [true,true]
+    eldest_claimant_or_partner_age: [64,64]
+    is_single_person: [true,true]
+    is_lone_parent: [false,false]
+    is_couple: [false,false]
+    benefits_premiums: [0,0]
+  output:
+    housing_benefit_applicable_amount: [9412,9412]
+
+- name: "A zero lower amount reform is not overwritten by the higher allowance"
+  period: 2017
+  input:
+    housing_benefit_eligible: true
+    housing_benefit_pension_age_regulations_apply: true
+    eldest_claimant_or_partner_age: 64
+    is_single_person: true
+    is_lone_parent: false
+    is_couple: false
+    benefits_premiums: 0
+    gov.dwp.housing_benefit.allowances.single.aged_under_65.amount: 0
+  output:
+    housing_benefit_applicable_amount: 0
+
+- name: "A working-age family does not use the historical pensioner category"
+  period: 2017
+  input:
+    housing_benefit_eligible: true
+    housing_benefit_pension_age_regulations_apply: false
+    eldest_claimant_or_partner_age: 64
+    is_single_person: true
+    is_lone_parent: false
+    is_couple: false
+    benefits_premiums: 0
+    gov.dwp.housing_benefit.allowances.single.older: 100
+  output:
+    housing_benefit_applicable_amount: 5200
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.