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Set Marriage Allowance take-up rate to HMRC outturn (#368) #369

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Merged
MaxGhenis merged 1 commit into from
Apr 20, 2026
Merged

Set Marriage Allowance take-up rate to HMRC outturn (#368) #369

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1 change: 1 addition & 0 deletions changelog.d/368.md
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- Set Marriage Allowance take-up rate to 0.5 (HMRC outturn ~2.1m claimants of ~4.2m eligible couples) instead of the placeholder 1.0, so microsimulation no longer overstates Marriage Allowance cost by ~£500m/year.
7 changes: 5 additions & 2 deletions policyengine_uk_data/parameters/take_up/marriage_allowance.yaml
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description: Percentage of eligible couples who claim Marriage Allowance.
description: Share of eligible couples who claim Marriage Allowance. HMRC outturn shows ~2.1m claimants vs ~4.2m eligible (~50% take-up). Read by `datasets/frs.py` to populate `would_claim_marriage_allowance` stochastically per person.
metadata:
unit: /1
label: Marriage Allowance take-up rate
reference:
- title: House of Commons Library — Income tax allowances for married couples (SN00870)
href: https://commonslibrary.parliament.uk/research-briefings/sn00870/
values:
2000-01-01: 1
2000-01-01: 0.5
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