Marriage Allowance Calculator

Find out if you qualify for the UK marriage allowance and what it is worth. £252 a year if you do, up to £1,260 if you backdate four years.

Your incomes

Lower earner's annual income

Must be under the £12,570 personal allowance for the transfer to be worth anything.

Higher earner's annual income

Must be a basic-rate taxpayer (£12,570 to £50,270).

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Eligible

£252 / year

Plus up to £1,260 if you backdate to the earliest claimable tax year.

The transfer: the lower earner gives up 10% of their personal allowance (£1,260 in 2026-27) and the higher earner receives it.
The saving: £1,260 of income that would have been taxed at 20% is now tax-free. £252 per couple per year.
Backdating: you can claim for the current tax year plus the previous four, so up to £1,260 in one claim.
Apply via HMRC: at gov.uk/marriage-allowance. Free, no advisers needed.