Marriage Allowance: 4-year retrospective claim

Who qualifies for retrospective claim

All four conditions must have been met in each tax year you're claiming for:

• You were married or in a civil partnership (cohabiting doesn't count).
• The lower earner had total taxable income below £12,570 (or whatever the Personal Allowance was that year — has been £12,570 since 2021/22).
• The higher earner was a basic-rate taxpayer (income between £12,570 and £50,270 — or pre-2024, £37,700 + PA).
• You were both UK-resident for tax.

If you became higher-rate in one of the years (e.g. a bonus pushed you over £50,270), that year is NOT eligible. Other years may still be.

How much you can get back

The 2025/26 claim isn't "retrospective" technically — it's the current year claim, but you can claim it now if you missed earlier.

The 4-year window — strictly enforced

HMRC enforces the 4-year window strictly. As of 2026/27 (current tax year 2025/26), the earliest year you can backdate is 2021/22. Years before that are permanently lost.

The window slides each year — on 6 April 2027, the earliest claimable year becomes 2022/23, and 2021/22 is lost forever.

How to claim retrospectively

The lower-earner spouse makes the claim:

1. Visit gov.uk/marriage-allowance.
2. Sign in with Government Gateway. If you don't have an account, create one — you'll need your NI number and ID.
3. Apply for Marriage Allowance. The form asks for both spouses' NI numbers and the dates of marriage.
4. Indicate that you want to backdate the claim. Specify which years.
5. HMRC processes the claim. For backdated years, refunds come as a cheque or BACS to the higher-earner spouse (because they paid the tax).

Alternative for non-tech-savvy applicants: paper form MATCF, downloadable from gov.uk, post to HMRC. Slower (8–12 weeks) but works.

Worked example

What happens if you become higher-rate

If the higher-earning spouse becomes higher-rate (income above £50,270), the claim is automatically cancelled for that tax year. Marriage Allowance is unavailable to higher-rate taxpayers.

If the lower-earning spouse becomes higher-earning (income above £12,570), the £1,260 transfer would push them into negative taxable income — so the claim is also cancelled.

If circumstances change mid-year, you can cancel via the HMRC online portal. The claim stops from the next tax year.

What happens after divorce or death

If the marriage ends:

• Divorce. The claim cancels from the start of the tax year following decree absolute. Backdated claims for years you were still married remain valid.
• Death of a spouse. The claim can still be retrospectively made by the surviving spouse for years the deceased was eligible. HMRC requires the death certificate.
• Death of the higher-rate spouse. The surviving lower-earner can claim the refunds — they're paid to the estate then distributed.

Common pitfalls

• Assuming you can claim 5+ years back. The window is 4 tax years + current year. Years before that are lost.
• Claiming when both partners are basic-rate. Marriage Allowance requires one partner below PA, not both basic-rate. If both work and earn £30k each, neither qualifies.
• Forgetting to factor in pension contributions and Gift Aid. These reduce adjusted net income, potentially keeping a borderline higher-rate spouse in basic rate — and Marriage Allowance becomes available.
• Using marriage allowance "calculators" run by third parties. Many take a fee from the refund. HMRC's process is free — go direct.

Sources and methodology

Marriage Allowance is in section 55B of the Income Tax Act 2007. The 4-year backdate window follows the standard tax overpayment recovery rules. See HMRC's Marriage Allowance guidance. For a personalised eligibility check, see the Marriage Allowance checker. The methodology page documents sources.

Related guides

• Marriage Allowance after divorce
• When Marriage Allowance isn't worth it
• Marriage Allowance checker
• Getting married — money guide
• Divorce finances guide