Marriage Allowance Explained (2025/26): Who Can Claim and How Much Can You Save?

Many couples are unknowingly paying more tax than necessary. Marriage Allowance allows eligible married couples and civil partners to transfer part of their Personal Allowance from the lower earner to the higher earner, potentially reducing their annual tax bill.

Despite being one of the most straightforward tax reliefs available, millions of eligible couples either do not know about it or have never got around to claiming. Worse still, many who could claim assume the process is complicated — it isn't. A claim takes minutes and, once made, usually renews automatically each year.

This guide explains exactly how Marriage Allowance works, who qualifies, how much you can save and how to apply. Every figure reflects the 2025/26 tax year for England, Wales and Northern Ireland (Scottish taxpayers can also claim, with the same £1,260 transfer).

The short answer

What is Marriage Allowance?

Marriage Allowance was introduced by HMRC to help lower-income married couples and civil partners keep more of their household income. It works by allowing the partner who earns the least — typically someone who doesn't use all of their tax-free Personal Allowance — to transfer part of that unused allowance to the higher earner.

In 2025/26 the standard Personal Allowance is £12,570 — the amount of income you can receive before paying any Income Tax. Marriage Allowance lets the lower earner give up 10% of this allowance (£1,260) and pass it to their partner, reducing the partner's tax bill.

• Introduced by HMRC to support lower-income couples.
• Available to married couples and civil partners only.
• Not available to unmarried couples, even if you live together or have children.
• Renews automatically each year once claimed, unless your circumstances change.

How much can you save?

The saving is calculated simply: the recipient is a basic-rate (20%) taxpayer, so transferring £1,260 of tax-free allowance reduces their tax bill by 20% × £1,260 = £252. The exact figure can vary by a pound or two depending on rounding, but £252 is the headline saving for 2025/26.

Who can claim?

To qualify for Marriage Allowance in 2025/26, you must be married or in a civil partnership and meet two income conditions between you.

In short: one partner earns under the Personal Allowance, the other is a basic-rate taxpayer. If that describes you, you almost certainly qualify. (In Scotland the recipient must pay the starter, basic or intermediate rate, broadly matching the same income band.)

Who cannot claim?

Marriage Allowance is deliberately targeted at lower-income couples, so several groups are excluded.

• Higher-rate taxpayers — if the recipient earns more than £50,270, they pay tax at 40% and are not eligible.
• Additional-rate taxpayers — those earning above £125,140 cannot claim.
• Unmarried couples — cohabiting partners, regardless of how long they've lived together or whether they have children, cannot claim.
• Couples where both pay tax at the basic rate and neither has spare allowance — there is nothing to transfer.

Example — does not qualify: Sam earns £58,000 (a higher-rate taxpayer) and his husband earns £9,000. Even though one partner has spare allowance, the recipient is a higher-rate taxpayer, so they cannot claim.

How the transfer works

The mechanics are simple. The lower earner applies to give up £1,260 of their Personal Allowance, HMRC moves it to the higher earner, and the higher earner's tax-free allowance increases — reducing their tax bill.

Importantly, the transfer is a fixed £1,260 — you cannot choose a smaller amount. The lower earner's own allowance falls to £11,310, but because their income is below that figure they usually pay no extra tax.

Worked examples

These examples show how Marriage Allowance plays out for three typical couples in 2025/26.

Example 1 — £10,000 and £30,000

• Partner A: £10,000 income — below the £12,570 allowance, pays no tax, has spare allowance to transfer.
• Partner B: £30,000 income — a basic-rate taxpayer.
• Result: Partner A transfers £1,260. Partner B's allowance rises to £13,830, saving the couple £252. Partner A still pays no tax.

Example 2 — £8,000 and £40,000

• Partner A: £8,000 income — well below the allowance.
• Partner B: £40,000 income — comfortably a basic-rate taxpayer.
• Result: The £1,260 transfer reduces Partner B's tax by £252. Partner A's reduced £11,310 allowance still comfortably covers their £8,000 income, so they pay no tax.

Example 3 — £12,000 and £50,000

• Partner A: £12,000 income — just under the allowance, with a small amount spare.
• Partner B: £50,000 income — still inside the basic-rate band (below £50,270), so eligible.
• Result: Partner B saves £252. Note Partner A's allowance drops to £11,310, which is below their £12,000 income, so they would pay 20% tax on the £690 difference (about £138) — but the couple is still better off overall by roughly £114.

Common mistakes

• Assuming cohabiting couples qualify. You must be legally married or in a civil partnership — living together is not enough.
• Believing both partners receive tax relief. Only the higher earner's tax bill is reduced; the allowance simply moves across.
• Thinking higher-rate taxpayers qualify. If the recipient earns above £50,270, the couple is not eligible.
• Forgetting to backdate claims. You can usually claim for up to four previous tax years, which many people overlook.
• Not cancelling after a change. If you separate or the recipient becomes a higher-rate taxpayer, the claim should be stopped.

How to apply

Applying is free and quick. The lower-earning partner must make the claim, because they are the one giving up part of their allowance.

Once approved, the allowance is usually applied within a couple of months and the claim renews automatically each year — you do not need to reapply unless your circumstances change.

Backdating claims

One of the most valuable — and most overlooked — features of Marriage Allowance is that eligible couples can usually backdate a claim for up to four previous tax years, provided they were eligible in those years. HMRC pays any refund for past years as a lump sum or via a tax-code adjustment.

Marriage Allowance and PAYE

For most employees the relief is delivered automatically through PAYE. When a claim is approved, HMRC changes the recipient's tax code — most commonly adding the letter M (for the partner receiving the allowance) or N (for the partner transferring it).

• Tax code changes: the recipient's code rises (e.g. from 1257L to 1383M), giving more tax-free pay each period.
• How relief appears: slightly higher take-home pay, spread across the year rather than as a single refund.
• Payroll adjustments: your employer simply applies the new tax code — you don't need to do anything.

Marriage Allowance and Self Assessment

If either partner completes a Self Assessment tax return, Marriage Allowance is still claimed through the GOV.UK service (or noted on the return), and HMRC applies the relief when calculating the tax due.

• Reporting: the transfer is reflected in your Self Assessment calculation rather than only via your tax code.
• How HMRC applies it: the recipient's tax liability is reduced by up to £252, and any backdated years can be settled through the return or a separate refund.

Related guides

Marriage Allowance is one piece of the wider UK tax picture. These guides help you understand how Income Tax, allowances and take-home pay fit together.

• £20k Salary After Tax UK — take-home pay and deductions on a £20,000 salary.
• £30k Salary After Tax UK — how a basic-rate salary is taxed in full.
• £35k Salary After Tax UK — tax and take-home pay on a £35,000 salary.
• Child Benefit Tax Charge Explained — how the High Income Child Benefit Charge works.
• Salary Sacrifice Explained — cut Income Tax and National Insurance with pension sacrifice.
• Adjusted Net Income Explained — the hidden number that controls your tax bill.