feat: implement LHA cap for private renters on HB and UC#30
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nikhilwoodruff merged 1 commit intomainfrom Apr 8, 2026
Merged
feat: implement LHA cap for private renters on HB and UC#30nikhilwoodruff merged 1 commit intomainfrom
nikhilwoodruff merged 1 commit intomainfrom
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…ment Adds proper Local Housing Allowance cap logic for private renters on HB and UC housing element. The model previously used full reported rent as eligible rent for all tenures, overstating HB/UC for private renters above their LHA cap. Changes: - LhaParams struct with region×bedroom-category monthly rate table (12 regions × 5 categories A–E), private_rent_index multiplier for reform scenarios, and enabled flag - lha_bedroom_entitlement() implements UC Regs 2013 Sch.4 / HB Regs 2006 Sch.B1: same-sex children over 10 share first, remainder share in pairs - lha_monthly_cap() applies cap only to TenureType::RentPrivately - Both calculate_housing_benefit() and calculate_universal_credit() now apply the LHA cap to eligible rent for private renters - 2025/26 rates from VOA list of rents (2020 data, uprated to April 2024 using ONS IPHRP index, frozen at that level for 2025/26 re-freeze) - 6 new unit tests covering bedroom entitlement and cap behaviour EFRS calibration needs to be rerun to recalibrate weights against the updated simulated HB/UC values: python scripts/rebuild_all.py --only efrs Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Private renters on HB and UC previously had eligible rent set to their full reported rent, overstating housing support for anyone above their LHA cap. This adds proper cap logic.
lha_bedroom_entitlement()implements the sharing rules from UC Regs 2013 Sch.4 / HB Regs 2006 Sch.B1: same-sex children over 10 share first, spare spaces filled by under-10s of the same gender, remaining under-10s share in mixed pairs. The cap then applies only toTenureType::RentPrivately; social renters are unaffected.Rates are region×category monthly amounts (12 regions × 5 categories A–E) derived from the VOA list of rents (2020 data, uprated to April 2024 via ONS IPHRP index, frozen at that level for the 2025/26 re-freeze). A
private_rent_indexscalar allows reform scenarios — e.g.1.10models a 10% LHA uplift.Note: EFRS calibration weights need regenerating after this — run
python scripts/rebuild_all.py --only efrs.