Marriage Allowance — who actually benefits and how to claim it

Marriage Allowance is one of the simpler tax reliefs HMRC offers, and one of the most under-claimed. It lets a couple where one partner earns below the personal allowance transfer a slice of their unused allowance to the other, saving up to around £252 a year. Claims can be backdated four tax years, so a first-time claimant who’s been eligible all that time can recover over £1,000.

What it actually does

Every UK taxpayer gets a personal allowance — currently £12,570 — they can earn before paying any income tax. If you earn less than the allowance, the unused portion is wasted. You can’t carry it forward, you can’t bank it, and ordinarily you can’t give it to anyone else.

Marriage Allowance is the one exception. If you’re married or in a civil partnership, the lower earner can transfer £1,260 of their personal allowance to the higher earner — provided the higher earner is a basic-rate taxpayer.

The receiving partner gets the £1,260 added to their personal allowance. At the 20% basic rate, that’s worth £252 a year of tax saved.

Who’s eligible

Four conditions:

1. You’re married or in a civil partnership. Living together doesn’t count.
2. The lower earner’s income is below the personal allowance (£12,570). They have £1,260 of allowance they aren’t using.
3. The higher earner is a basic-rate taxpayer — broadly, income between £12,571 and £50,270 in the rest of the UK, or between £12,571 and £43,662 in Scotland.
4. You’re both born on or after 6 April 1935. Couples where one or both were born before that date should look at the older Married Couple’s Allowance instead.

If the higher earner is a higher-rate or additional-rate taxpayer, you can’t claim. If the lower earner’s income is above the personal allowance, you can’t claim either — though there’s an edge case below.

The Scottish variant

Scottish income tax bands are different, but Marriage Allowance is administered by HMRC and uses the rest-of-UK definition of basic-rate taxpayer in some places and the Scottish definition in others — the practical rule is that you’re eligible if the higher earner is a Scottish basic-rate or intermediate-rate taxpayer.

gov.uk’s Marriage Allowance guidance confirms the Scottish-specific eligibility.

A worked example

Sam earns £8,000 a year (part-time work). Sam’s personal allowance is £12,570, leaving £4,570 of allowance unused.

Sam’s partner Jo earns £35,000 a year. Jo’s tax bill is 20% on (£35,000 − £12,570) = 20% × £22,430 = £4,486.

Sam transfers £1,260 of allowance to Jo via Marriage Allowance. Jo’s personal allowance becomes £13,830. Jo’s new tax bill: 20% × (£35,000 − £13,830) = 20% × £21,170 = £4,234. Saving: £252.

Sam’s tax bill is unchanged — Sam was paying £0 tax to begin with, and now has an allowance of £11,310, which is still well above £8,000 of income.

Net household gain: £252 a year, every year, until circumstances change.

The four-year backdating rule

If you’ve been eligible for several years and never claimed, you can backdate the claim up to four tax years. As of 2026/27, that means claims can go back to the 2022/23 tax year inclusive.

The savings stack:

• 2022/23: £252
• 2023/24: £252
• 2024/25: £252
• 2025/26: £252
• 2026/27: £252 (current year)

Maximum recoverable backdated claim: around £1,260, on top of the current-year benefit. HMRC pays the backdated amount as a lump sum, usually by bank transfer or cheque.

You only need to claim once. After the initial claim, Marriage Allowance renews automatically each year unless you cancel it or your eligibility changes.

When it backfires

There are a couple of situations where the transfer is mathematically the wrong move:

1. The lower earner is just below the allowance, with rising income. If Sam in the example above starts earning £12,000, the unused allowance is only £570 — but Marriage Allowance still transfers £1,260. Sam now has only £11,310 of allowance to use against £12,000 of income, so Sam pays 20% tax on £690 = £138. Jo’s tax saving is still £252. Net household gain: £252 − £138 = £114. Worth doing, but the gain is smaller than it appears.

If Sam earns above the £12,570 allowance, the transfer becomes a net loss — Sam pays more tax than Jo saves. In that case, don’t claim.

2. The higher earner gets a pay rise into higher-rate territory. Marriage Allowance is only valid while the receiving partner remains a basic-rate taxpayer. If Jo gets promoted and starts earning £55,000, HMRC will cancel the transfer for the year the higher-rate status begins. No penalty, but the gain disappears.

3. You separate or one partner dies. The transfer can stay in place for the current tax year and stops the following year. The surviving or remaining partner can sometimes claim a final year’s allowance transfer in the year of bereavement.

How to claim

The cleanest route is through HMRC’s online service. You’ll need:

• Both partners’ National Insurance numbers.
• Both partners’ Government Gateway user IDs (or you create them at the same time).
• Proof of ID — passport number, driving licence, or a recent P60.

The lower-earning partner is the one who makes the claim, because they’re the one transferring the allowance. HMRC adjusts both partners’ tax codes the next time payroll runs.

For the higher earner, the tax code typically changes to one ending in M (received Marriage Allowance). For the lower earner, the tax code ends in N (transferred Marriage Allowance). You can confirm by looking at your tax code letter or your most recent payslip.

You can also claim by post using form MA1, or over the phone — but the online route is by far the fastest and pays backdated claims more quickly.

Why so many eligible couples don’t claim

HMRC estimates that millions of eligible couples haven’t claimed. The usual reasons:

• One partner’s income is low enough not to interact with the tax system, so neither partner thinks of it as a “tax thing”.
• They’ve seen ads from third-party claim-management companies (who charge a fee for what is essentially a five-minute online form) and assumed there must be a catch.
• They assumed it was means-tested or income-tested in a more complex way than it actually is.

There’s no need to use a claims company. The HMRC form is free and straightforward. If you’ve been emailed by a company promising to recover Marriage Allowance for a percentage cut, the same claim can be made directly with HMRC for nothing.

The bigger context

Marriage Allowance is small but real money — £252 a year for a five-minute claim, plus up to four years backdated. For couples on tight budgets or in retirement, it’s genuinely useful. For couples where one partner is permanently below the personal allowance — a parent at home with young children, someone in retirement with no taxable income, someone on long-term reduced hours — it’s a structural saving that recurs every year automatically.

The bar to claim is low and the cost of getting it wrong is low — HMRC just adjusts the tax codes if your circumstances change. Worth a few minutes of admin even if the gain feels modest.

For the related question of using your full personal allowance, see our guide to how the personal allowance works.

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Last updated 1 June 2026. This guide is educational and is not personal financial advice. Marriage Allowance rules and the £1,260 transferable amount are set by HMRC and can change in any Budget — verify current figures on gov.uk before relying on them. See our disclaimer.