Marriage Allowance Is Worth £1,252 Before April 5 — and Most Eligible Couples Never Claim It

The mechanics are simple. The lower earner transfers £1,260 of their <a href="/posts/tax-guide-inheritance-tax-uk-202526-rates-thresholds-and-planning">Personal Allowance</a> — currently £12,570 — to their partner. Their own allowance drops to £11,310, while the partner's taxable income falls by £1,260.

At the 20% basic rate, that's a £252 annual saving. The lower earner might pay slightly more tax if they earn between £11,310 and £12,570, but the household always comes out ahead.

Here's the example HMRC gives: if you earn £11,500 and your partner earns £20,000, you're currently paying tax on £7,430 as a couple. After the transfer, that drops to £6,360 — a saving of £214 even in that specific case.

The saving is flat at £252 regardless of how much the higher earner makes — as long as they're a basic-rate taxpayer (income between £12,571 and £50,270 in England). The transfer is a fixed amount, not a percentage.

The real value isn't the annual £252. It's the backdating.

HMRC allows you to claim Marriage Allowance for any tax year back to 2021/22 where you were eligible. If you've been eligible for all five years (2021/22 through 2025/26), you're looking at approximately £1,252 in one payment — five years of savings delivered as a lump sum, with subsequent years applied automatically.

But the clock is ticking. On 6 April 2026, the 2021/22 tax year falls outside the four-year backdating window. That's roughly £250 you can never recover.

The partner who receives the allowance gets the refund. HMRC typically processes it within weeks for online applications, or adjusts the tax code for the current year going forward.

The eligibility rules from gov.uk are straightforward:

• You must be married or in a civil partnership (cohabiting couples don't qualify — a quirk of UK tax law that's unlikely to change soon)
• The lower earner's income must be below the Personal Allowance (£12,570)
• The higher earner must pay tax at the basic rate — income between £12,571 and £50,270

Scottish taxpayers have a different ceiling. The higher earner must pay the starter, basic, or intermediate rate, which means income between £12,571 and £43,662 for the 2025/26 tax year.

One common misconception: pensioners absolutely qualify. If one partner receives only the State Pension (currently around £11,500 for the full new State Pension), they're an ideal candidate for the lower earner role. Couples where one partner has stopped working — for childcare, retirement, or any other reason — are the sweet spot.

You cannot claim Marriage Allowance alongside the older Married Couple's Allowance (available if either partner was born before 6 April 1935). Check which gives you more — the Married Couple's Allowance maximum is £11,270 for 2025/26, though it works differently.

HMRC's own data suggests millions of eligible couples haven't claimed. The reasons are boringly predictable.

First, awareness. Marriage Allowance isn't deducted automatically — unlike, say, the Personal Allowance itself. You have to actively apply. Many couples simply don't know it exists.

Second, the annual amount sounds small. £252 won't change anyone's life. But over a decade, that's £2,520 — and with backdating, you start with a four-figure lump sum. Compound that by putting the refund into an ISA earning 4-5%, and the numbers start to matter.

Third, there's a misconception that it's complicated. The online application on gov.uk takes about ten minutes. You need your National Insurance numbers and a Government Gateway account. The transfer then applies automatically every year until you cancel it.

The behavioural economics here are classic: a small, certain gain that requires a small action gets ignored because nobody sees the cumulative cost of inaction.

The lower earner applies — not the higher earner. This catches people out.

1. Go to gov.uk/marriage-allowance
2. Check eligibility using the online calculator
3. Apply online with your National Insurance number and your partner's
4. Select the years you want to backdate

The backdated refund is sent as a cheque or paid into the higher earner's bank account. The current year's allowance is applied through a tax code adjustment — the higher earner's code changes from 1257L to 1383L (reflecting the extra £1,260 of allowance).

If either partner dies, you can still claim for years the deceased was alive. Phone the Income Tax helpline rather than applying online.

One thing to watch: if the lower earner's income rises above £12,570, cancel the transfer promptly. Otherwise you'll create a tax underpayment that HMRC will collect through the following year's tax code.

Marriage Allowance is just one piece of the tax year-end puzzle. With 16 days until 5 April 2026, here's what else resets:

• <a href="/posts/16-days-to-use-it-or-lose-it-last-minute-isa-allowance-strategies-for-202526">ISA allowance</a>: Your £20,000 ISA allowance is use-it-or-lose-it. Unlike Marriage Allowance, there's no backdating.
• Capital gains tax: The £3,000 annual exempt amount cannot be carried forward
• Pension contributions: Annual allowance of £60,000 (with carry forward from previous three years) for tax relief on pension contributions
• Gift allowances: Your £3,000 annual IHT exemption expires — relevant if you're doing inheritance planning

Marriage Allowance stands out because the backdating option makes the return on ten minutes of effort disproportionately large. A £1,252 lump sum for filling in an online form is hard to beat on an effort-adjusted basis.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.