Decision
Document the historical Housing Benefit child personal allowance rules, but do not implement C1 or introduce claim-history/exception inputs in this update batch. This is a deferred design issue, not authorization to encode the rules.
The protected treatment is legacy behaviour inherited from the pre-2017 rules, under which each qualifying child or young person could contribute a personal allowance to the applicable amount (the income threshold used in the HB means test). The 2017 restriction did not simply replace that treatment with an unconditional two-child count.
Historical rules
- Great Britain introduced the default two-child restriction on 6 April 2017. Northern Ireland introduced it on 11 May 2017. The restriction concerns child personal allowances, not bedroom entitlement or child disability premiums. DWP Circular A5/2017, paragraphs 2–13, NI commencement, regulation 1.
- Claimants entitled to HB and responsible for more than two qualifying household children on 5 April 2017 in GB, or 10 May 2017 in NI, had protection for those individual children. A new HB claim ended that protection. A newly added child did not remove the original children's protection, but ordinarily only fitted within any remaining spaces under the default two-child rule. For example, three protected children plus a new baby could still produce three child allowances, not two or four. GB transitional protection, regulation 9, NI transitional protection, regulation 8.
- HB could follow a more generous Child Tax Credit assessment that included ordinary individual child elements for additional children. An assessed CTC award could establish this even when its payable amount was zero. A positive payment amount alone therefore cannot establish the HB child count. GB HB regulation 22(3)–(5), DWP Circular A5/2017, paragraphs 9–14 and Annex A.
- CTC retained ordinary child elements for children born before 6 April 2017 and had conditional exceptions for later children, including multiple births, adoption, non-parental care and non-consensual conception. Adoption and non-parental-care treatment changed on 28 November 2018. CTC disability and childcare elements alone do not establish that the ordinary individual child element was included. HMRC guidance.
- The restriction ended for pension-age HB on 8 June 2024 in both jurisdictions and for working-age HB on 6 April 2026 in both jurisdictions. Do not confuse the model's annual calculation convention with these legal commencement dates. GB pension-age amendment, regulations 1 and 6, NI pension-age amendment, regulations 1 and 5, GB working-age removal, NI working-age removal.
Why implementation is deferred
Current ages and family size do not determine which children were protected, whether a later new HB claim ended protection, or which ordinary child elements were included in a CTC assessment (including a nil-payment award). Counting all current children throughout the restricted years, capping every family at two, or copying a birth-date test without the CTC assessment would each misrepresent some households.
Before any implementation, agree a bounded design for the required facts, their data sources, absent-data behaviour and treatment of mid-year changes. A pre-assessed legally included child count is one possible design, not an approved addition. Do not reconstruct sensitive exception assessments from generic household flags.
The ordinary child allowance remains unimplemented in this batch, including the unrestricted-period-only proposal. Child disability and protected family-premium work are separate approved components: see #2221 and #2223. This issue does not revive closed PR #2198 or its associated issues.
Decision
Document the historical Housing Benefit child personal allowance rules, but do not implement C1 or introduce claim-history/exception inputs in this update batch. This is a deferred design issue, not authorization to encode the rules.
The protected treatment is legacy behaviour inherited from the pre-2017 rules, under which each qualifying child or young person could contribute a personal allowance to the applicable amount (the income threshold used in the HB means test). The 2017 restriction did not simply replace that treatment with an unconditional two-child count.
Historical rules
Why implementation is deferred
Current ages and family size do not determine which children were protected, whether a later new HB claim ended protection, or which ordinary child elements were included in a CTC assessment (including a nil-payment award). Counting all current children throughout the restricted years, capping every family at two, or copying a birth-date test without the CTC assessment would each misrepresent some households.
Before any implementation, agree a bounded design for the required facts, their data sources, absent-data behaviour and treatment of mid-year changes. A pre-assessed legally included child count is one possible design, not an approved addition. Do not reconstruct sensitive exception assessments from generic household flags.
The ordinary child allowance remains unimplemented in this batch, including the unrestricted-period-only proposal. Child disability and protected family-premium work are separate approved components: see #2221 and #2223. This issue does not revive closed PR #2198 or its associated issues.