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Marriage Allowance UK 2026: The Free Tax Break 2 Million Couples Are Still Missing

There is a tax break available to millions of UK couples that costs nothing to claim, takes about 15 minutes to apply for online, and can put up to £1,260 into your bank account in a single payment. It renews automatically every year. It does not affect benefits. And HMRC estimates that over 2 million eligible couples have never claimed it.

It is called Marriage Allowance, and the new 2026/27 tax year is a particularly good moment to check whether you qualify — because the backdating window has just refreshed, meaning first-time claimants can now reach back as far as the 2022/23 tax year.

This guide explains exactly who qualifies, how the numbers work, every trap worth knowing about, and how to claim it properly for free.

What Is Marriage Allowance?

Marriage Allowance is a government scheme that lets the lower earner in a married couple or civil partnership transfer 10% of their Personal Allowance to their partner. For 2026/27, that is £1,260 of unused Personal Allowance transferred across.

The higher earner receives a 20% tax credit on that £1,260 — cutting their annual tax bill by up to £252. Once you claim, it renews automatically every year. You never have to reapply unless your circumstances change.

The mechanics are simple. The lower earner has Personal Allowance they are not using — they earn less than £12,570 so they pay no tax anyway. Transferring £1,260 of that to their partner costs the lower earner nothing in practice, because they were not using it. The higher earner, who does pay tax, gets a £252 credit applied to their tax bill — either through an adjusted tax code if they are employed, or as a reduction in their Self Assessment bill if they are self-employed.

Who Qualifies

To claim Marriage Allowance in 2026/27 you must meet all of the following:

You must be married or in a civil partnership. Living together as a couple does not count. The allowance is specifically for legal partnerships.

The lower earner must earn below the Personal Allowance. In 2026/27 the Personal Allowance is £12,570. To get the full £252 benefit, the lower earner should ideally earn £11,310 or less — because transferring £1,260 reduces their own allowance from £12,570 to £11,310, and if they earn more than £11,310 they will start paying a small amount of tax themselves. The couple still benefits overall, but it is worth calculating if the lower earner earns between £11,310 and £12,570.

The higher earner must be a basic-rate taxpayer. In England, Wales, and Northern Ireland, this means their income is between £12,571 and £50,270. In Scotland the threshold is £12,571 to £43,662 due to different Scottish income tax bands. If the higher earner pays 40% or 45% tax, they do not qualify — the allowance is designed only for basic-rate taxpayers.

Both partners must have been born after 6 April 1935. Couples where at least one partner was born before that date may qualify for the separate Married Couple's Allowance instead, which is worth significantly more (up to £1,170 in 2026/27).

Common qualifying situations include couples where one partner works part-time, stays at home to raise children, is a carer, has retired early, or has taken a career break. A stay-at-home parent whose partner earns £35,000 is a perfect example — the staying-at-home partner has unused Personal Allowance, and the working partner pays basic-rate tax.

How Much You Can Claim: The Backdating Opportunity

The headline saving of £252 per year understates what many first-time claimants can actually receive.

HMRC allows you to backdate your Marriage Allowance claim by up to four previous tax years, provided you were eligible in each of those years. With the 2026/27 tax year now open, the four-year backdating window runs back to the 2022/23 tax year. If you were eligible in all five years (2022/23 through to 2026/27), the total backdated payment is:

You can only claim for years in which you both met the eligibility conditions. If the higher earner was a higher-rate taxpayer in 2022/23, for example, you cannot claim for that year — only for years when both conditions were met.

The Traps Worth Knowing About

The £11,310 income cliff edge. If the lower earner earns between £11,310 and £12,570, claiming Marriage Allowance will reduce their Personal Allowance to £11,310, meaning they pay a small amount of income tax on the difference. The couple still benefits overall as long as the higher earner earns at least £13,830 from employment — but it is worth checking the specific numbers before applying if the lower earner is close to this range. HMRC has a free Marriage Allowance calculator at gov.uk/marriage-allowance.

Savings interest can affect eligibility. If the higher earner receives significant savings interest that pushes their total income above the £50,270 higher-rate threshold, they lose their eligibility for Marriage Allowance. They also lose the Personal Savings Allowance at the same time, which can be a double hit. If you or your partner has substantial savings, check the combined total income carefully before applying.

Fiscal drag is quietly pulling more people out of eligibility. The Personal Allowance has been frozen at £12,570 since 2021/22 and is confirmed to stay frozen until at least 2028. As wages rise with inflation, some higher earners who were previously basic-rate taxpayers are being dragged above the £50,270 threshold and losing eligibility without realising it. If your income has increased significantly, check that you are still below the threshold before applying or before the next renewal.

The non-taxpayer must apply, not the higher earner. This is the single most common mistake. It is the lower earner — the one transferring the allowance — who applies on GOV.UK. If the higher earner applies, HMRC will reject or reverse it. The lower earner needs their own National Insurance number and Government Gateway login to apply.

Avoid paid claims companies. A number of commercial companies advertise a service to claim Marriage Allowance on your behalf, typically charging 30% to 42% of the total refund as their fee. This is entirely unnecessary. The GOV.UK online application takes around 15 minutes and is completely free. On a £1,260 claim, using a commercial service could cost you £380 or more. Go directly to gov.uk/marriage-allowance.

Backdating online only covers the current year. If you want to claim online for the current tax year plus backdated years simultaneously, you need to do this in two steps — apply online for 2026/27, then submit backdated years separately by post or phone (0300 200 3300). Some couples find it simpler to do everything by phone in one call. Either route works.

How to Claim: Step by Step

Step 1: Check eligibility. Confirm the lower earner earns below £12,570 and the higher earner earns between £12,571 and £50,270 (or £43,662 in Scotland). If in doubt, use the HMRC calculator at gov.uk/marriage-allowance.

Step 2: The lower earner applies. Go to gov.uk/marriage-allowance and click "Apply now." You will need your National Insurance number, the higher earner's National Insurance number, and your Government Gateway login. If you do not have a Government Gateway account, you can create one during the application — you will need a form of ID.

Step 3: Select your claim years. The online form covers the current tax year (2026/27). Tick this and submit. For backdated years (2022/23 to 2025/26), you need to either call HMRC on 0300 200 3300 and ask them to add the previous years, or write to HMRC including both partners' names, National Insurance numbers, and the years you wish to claim.

Step 4: Wait for confirmation. HMRC will send a confirmation and update the higher earner's tax code — look for the letter "M" at the end of it (the lower earner's code will end in "N"). Processing takes two to four weeks online and up to eight weeks by post. Backdated lump sums are paid separately once verified.

Step 5: Do nothing further. Marriage Allowance renews automatically every year. You do not reapply unless your circumstances change — for example, if the higher earner's income changes, the relationship ends, or one partner's income moves above or below the relevant thresholds. If your situation changes, the lower earner cancels via their Personal Tax Account online.

What If a Partner Has Died?

If your partner died since 5 April 2022 and you were eligible for Marriage Allowance in years since that date, you can still claim the backdated allowance. You need to call the HMRC Income Tax helpline (0300 200 3300) rather than applying online, as the online system does not handle bereavement claims. The refund is paid to the surviving partner or to the estate, depending on which partner was the higher earner.

Marriage Allowance vs Married Couple's Allowance

These are two separate reliefs and you cannot claim both. Marriage Allowance (worth up to £252 per year) applies to couples where both partners were born after 6 April 1935. Married Couple's Allowance (worth up to £1,170 per year in 2026/27) applies to couples where at least one partner was born before that date. If you or your partner was born before 6 April 1935 — meaning they are 91 or older — check which allowance gives the larger benefit, but in most cases the Married Couple's Allowance will be more valuable.

Frequently Asked Questions

Does claiming Marriage Allowance affect Universal Credit or other benefits? No. Marriage Allowance is a pure income tax adjustment and has no effect on Universal Credit, Child Benefit, Housing Benefit, or any other means-tested benefit. It does not count as income for benefit purposes.

What if we only recently got married? You can claim for the current tax year immediately. You can also backdate to any previous years in which you were married or in a civil partnership and met the income conditions. If you married during a previous tax year, you can claim Marriage Allowance for that full year regardless of when in the year you married.

Can same-sex couples claim? Yes. Marriage Allowance applies equally to married same-sex couples and same-sex civil partnerships. The same income conditions apply.

My partner earns close to the £50,270 threshold. Is it worth claiming? Check the total income figure carefully, including any savings interest, rental income, dividends, or other sources. It is gross income, not just salary, that counts. If including all sources still comes to less than £50,270, you qualify. If it takes them above, you do not — and claiming incorrectly will result in HMRC clawing back the allowance later.

What happens if our circumstances change after we claim? If the higher earner's income rises above £50,270, or the lower earner's income rises above £12,570, the allowance should be cancelled. The lower earner cancels via their Personal Tax Account at gov.uk or by calling HMRC. HMRC will also sometimes cancel it automatically if tax returns or PAYE data shows you no longer qualify, but do not rely on this — cancel proactively if your circumstances change.

How do I know if I've already claimed? Check the higher earner's tax code. If it ends in the letter "M", Marriage Allowance is already applied. If it ends in something else (usually just a number), you have not claimed.

This article is for informational purposes only and does not constitute financial or tax advice. Tax rules, thresholds, and eligibility conditions are correct for 2026/27 as published by HMRC and are subject to change. Always verify current rates at GOV.UK and consult a qualified tax adviser if your situation is complex.