Key takeaways
- Marriage Allowance moves £1,260 of personal allowance to the higher-earning partner, cutting their Income Tax by up to £252 in the 2026 to 2027 tax year.
- The full £252 only lands when the transferring partner's income stays at or below £11,310. At £12,000 the couple keeps £114, and at £12,570 it keeps nothing.
- HMRC's statistics put 2022 to 2023 claimants at 2,350,000 and the cost at £580 million, which works out at roughly £247 for each claimant.
- A Scottish intermediate rate taxpayer faces a 21% marginal rate, but the reduction is still given at the basic rate, so it is £252 rather than £264.60.
- The pound of income that takes the recipient from £50,270 to £50,271 withdraws the whole reduction, a tax cost of £252.40 on that single pound.
What Marriage Allowance is worth in the 2026 to 2027 tax year
Up to £252, once, for the couple, in the year. That is the whole answer, and it is the number GOV.UK leads with: Marriage Allowance "reduces their tax by up to £252 in the tax year".
The mechanism is two moves, not one. The partner with the lower income gives up £1,260 of their personal allowance, and the partner with the higher income gets a reduction in the tax they owe. Section 55B of the Income Tax Act 2007 sets the transferable amount at "10% of the amount of personal allowance specified in section 35(1)", rounded up to a multiple of £10. The standard personal allowance is £12,570 for 2026 to 2027, so 10% is £1,257 and the rounding takes it to £1,260.
What the recipient gets is not an allowance. It is what the Act calls a tax reduction, and the rate is fixed. Section 55B(3) sets the "appropriate percentage" as the basic rate. At the 20% basic rate, £1,260 of transferred allowance is worth £252 off the bill. That ceiling does not move with how much the recipient earns, which is the first thing most calculators get right and most summaries skip.
Two conditions have to hold. You have to be married or in a civil partnership, and GOV.UK is explicit that living together isn't enough: "You cannot claim Marriage Allowance if you're living together but you're not married or in a civil partnership." The recipient also has to be a basic rate taxpayer, which GOV.UK describes as income "between £12,571 and £50,270 before they receive Marriage Allowance".
The full £252 needs the lower earner's income under £11,310
Here is where the headline figure starts leaking. Giving away £1,260 of allowance leaves the transferring partner with £11,310 instead of £12,570. If their income is above £11,310, they start paying tax they weren't paying before, and that tax comes straight off the couple's gain.
HMRC's own worked example shows it. On income of £11,500 against a partner earning £20,000, the couple's combined taxable income falls from £7,430 to £6,360, "which saves you £214 in tax". Not £252. The £38 difference is 20% of the £190 by which £11,500 exceeds the reduced £11,310 allowance.
Run that across the range and the shape is a straight line down to zero. The chart below plots the couple's net Income Tax saving against the transferring partner's income, holding the recipient at the basic rate.
- Income of £11,310 or less: no extra tax, and the couple keeps the full £252.
- Income of £11,500: £38 of extra tax, so the couple keeps £214.
- Income of £12,000: £690 above the reduced allowance, £138 of extra tax, and the couple keeps £114.
- Income of £12,300: £990 above it, £198 of extra tax, and the couple keeps £54.
- Income of £12,570: the whole £1,260 is taxed, £252 of extra tax, and the couple keeps nothing.
So the band that matters is narrow. Between £11,310 and £12,570 of income, every extra pound the transferring partner earns costs the couple 20p of the gain. GOV.UK puts the same point more gently: "you might have to pay more tax yourself, but you could still pay less as a couple".
What HMRC's own figures say the average claim is worth
HMRC publishes claimant counts and costs for each relief it tracks, and Marriage Allowance is one of them. In the tax relief statistics released on 22 January 2026, claimants ran 2,170,000 in 2020 to 2021, then 2,280,000, then 2,350,000 in 2022 to 2023. Claimant numbers rose by 180,000 across those two years.
The cost series over the same three years reads £560 million, £560 million, £580 million. Divide the 2022 to 2023 cost by that year's claimants and the average reduction is about £247.
That is within about £5 of the £252 ceiling, and closer than the leakage above might suggest. The gap is consistent with most claimants sitting well below the £11,310 line rather than inside the narrow band where the gain erodes, though a cost series rounded to the nearest £10 million cannot settle it. What it does show is that the relief pays out close to the figure the headline quotes.
One figure worth holding at arm's length: HMRC said in a press release on 10 August 2021 that "nearly 1.8 million married couples and those in civil partnerships are using Marriage Allowance", while its own statistical series puts 2021 to 2022 claimants at 2,280,000. The two aren't necessarily contradictory. The likeliest reading is that the press release counted live claims at a moment in time while the statistics attribute claims to the tax year they relate to, which backdating fills in afterwards. HMRC doesn't state the basis of the press release count, so that reconciliation is inference rather than fact. Backdating itself is not, and it is worth real money.
Marriage Allowance in Scotland is paid at the basic rate, not your marginal rate
Scotland sets its own rates on earned income, and for 2026 to 2027 they run starter at 19%, basic at 20% on £16,538 to £29,526, and intermediate at 21% on £29,527 to £43,662. A Scottish recipient qualifies across all three. GOV.UK says their income normally has to fall "between £12,571 and £43,662", against £50,270 elsewhere in the United Kingdom.
The reduction, though, doesn't track the marginal rate. HMRC's PAYE manual is unambiguous: "Scottish recipients who fall into the starter rate or intermediate rate are also entitled to the Marriage Allowance. The amount of relief is still calculated at the basic rate." Section 55B(3) says the same thing in statute, naming the Scottish basic rate rather than whatever rate the recipient actually pays.
For someone in the intermediate band, that is a measurable gap. At 21%, £1,260 would be worth £264.60. At the Scottish basic rate of 20% it is £252, so £12.60 of the relief a marginal-rate reading would predict never arrives. A starter rate taxpayer on 19% gets the opposite: the relief is given at 20%, above the rate they pay on the band it sits in.
A single pound of higher rate income withdraws the whole £252
The eligibility test is not a taper. Section 55B(2)(b) requires that the recipient "is not, for the tax year, liable to tax at a rate other than the basic rate", with a short list of savings and dividend rates alongside it. Liability at the higher rate breaks the condition outright.
The UK higher rate starts at £50,271 and runs at 40%. So a recipient on exactly £50,270 keeps the reduction, and a recipient on £50,271 loses all of it. That extra pound carries 40p of tax plus the £252 withdrawn, which is £252.40 of tax on one pound of income. That is a cliff edge rather than a taper, and it is the one point in the Marriage Allowance rules where the whole reduction goes at once. Our guide to what the income tax threshold freeze costs walks through how many people are being pushed into that stretch.
The cliff cuts both ways across a year. Eligibility is tested for the tax year as a whole, not month by month, so a bonus in March can retrospectively disqualify a claim that looked safe in October.
How the transfer reaches you, and what the M and N tax codes mean
Nobody sends a cheque for the current year. HMRC gives the recipient the transferred allowance "by changing their tax code", which it says "can take up to 2 months", or through a Self Assessment return where one is filed. The marriage allowance tax code is the visible trace: the recipient's code ends in M, and the transferor's ends in N.
The claim is made by the partner giving the allowance up, not the one receiving it, and GOV.UK notes that changes are backdated to 6 April if the application succeeds. It also renews itself. The allowance transfers "automatically to your partner every year until you cancel Marriage Allowance", which matters when circumstances change: a transferor whose income climbs past £11,310 keeps giving away the same £1,260 unless someone stops it.
Where both partners file Self Assessment returns, HMRC asks for the transferor's return at least 3 days ahead of the recipient's. The recipient leaves the Marriage Allowance section of their own return blank.
Backdating four years, and why the freeze fixes each year at £252
A claim made now reaches back further than most people expect. GOV.UK states that you can backdate "to 6 April 2022 (the 2022 to 2023 tax year) for any years you were eligible". That is four closed tax years plus the current one.
The arithmetic is unusually clean, and the reason is the threshold freeze. Section 5 of the Finance Act 2021, as amended, fixes the amount in section 35(1) of the Income Tax Act 2007 at £12,570 for every tax year from 2022 to 2023 through to 2030 to 2031, with the basic rate limit held at £37,700 alongside it. A frozen personal allowance means a frozen 10% of it. Every one of those years carries the same £1,260 transfer and the same £252 ceiling.
So five years at £252 is £1,260, of which £1,008 is the four backdated years. The number is the same as the transferable amount by coincidence, not by design. For comparison, the four-year backdated maximum HMRC quoted in August 2021 was £1,220, when the allowance for the earliest year in range was lower.
The freeze runs to 2030 to 2031 in current law, which is what makes the £252 figure durable rather than a snapshot. It also means £252 is a fixed cash amount for as long as the freeze holds, whatever happens to pay or prices.
Where savings interest and dividends break the arithmetic
Everything above assumes earnings and pension income only. Add savings or dividends and the simple subtraction stops working, because those sources have their own rates and their own allowances sitting on top of the personal allowance.
For 2026 to 2027 the starting rate for savings covers up to £5,000 at 0%, and the dividend allowance is £500. Section 12 of the Income Tax Act 2007 charges the starting rate only on savings income up to that £5,000 limit that “would otherwise be charged at the basic rate”, so other taxable income occupies the band first. Moving £1,260 of allowance between two people can therefore change how much savings interest one of them shelters. Section 55B(2) also writes the dividend nil rate and the starting rate for savings into the eligibility test, so a recipient can hold some dividend income without breaking the basic rate condition.
GOV.UK's response to this is to route people away from the online calculator entirely: anyone with dividends, savings income or taxable benefits from a job is pointed at the Income Tax helpline instead. That is a reasonable signal about where the arithmetic gets genuinely hard. The order in which income is taxed is what drives it, and we set that order out in our note on UK dividend tax and the order of taxation. For pensioner couples, where the state pension eats most of the allowance, the interaction we cover in tax on the state pension and the personal allowance is usually the binding one.
The couples for whom Married Couple's Allowance is the larger number
There is an older relief underneath this one, and for the people who qualify it is worth several times as much. Married Couple's Allowance needs one partner born before 6 April 1935, and GOV.UK is clear that "You cannot get Marriage Allowance and Married Couple's Allowance at the same time."
Sections 45 and 46 of the Income Tax Act 2007 set the reduction at "10% of the amount specified in subsection (3)(a)". For 2026 to 2027 HMRC's rates table puts the maximum amount at £11,700 and the minimum at £4,530, so the reduction runs from £453 to £1,170. Against a £252 ceiling, that is not a close call for anyone eligible.
One wrinkle for anyone checking the numbers themselves. The GOV.UK overview page still says Married Couple's Allowance "could reduce your tax bill by between £436 and £1,127 a year". Those are 10% of the 2025 to 2026 amounts of £4,360 and £11,270, not the current ones. Two GOV.UK pages disagree here, and the rates table is the one carrying the 2026 to 2027 figures.
The strongest case against treating £252 as money left on the table
The strongest case against chasing this relief is that £252 is a small number attached to a real risk of getting it wrong. The claim renews automatically and the eligibility test runs on the full tax year, so the couple most likely to be caught out is the one whose circumstances are changing: a return to work, a bonus, a pension drawn for the first time. In those cases the claim can be worth less than it looks, or nothing, while still sitting live on both tax codes.
A second objection is about the design rather than the arithmetic. The reduction is flat, so it pays the same £252 whether the recipient earns £20,000 or £50,270, and it turns on marital status rather than on household need. That is an argument about who should get the relief, not about whether the arithmetic works, and a reader deciding whether they qualify is answering a different question.
There is a narrower objection worth more weight. Nothing in the mechanism tells the lower earner they have crossed £11,310. The election renews itself every year until it is cancelled, so a rise in the transferor's income quietly shrinks what the couple gets on the other side. Tracking taxable income against a moving allowance is the sort of thing a UK investment tax rates and allowances table is for, and LedgerTouch keeps that view current.
What the HMRC statistics cannot tell you
Three limits sit on the figures above. The cost series is given in £ million, and every Marriage Allowance figure in it lands on a multiple of £10 million, so the £247 average carries a couple of pounds of rounding either way and should be read as a range rather than a point. The 2023 to 2024 figures and later are HMRC's forecasts rather than outturn, which is why this piece quotes 2022 to 2023 for the average.
The third is the one that matters most for the "couples who never claim" framing. HMRC's notes column for Marriage Allowance reads "Not available", and the publication carries no estimate of how many couples are eligible but have not claimed. Nothing in this sample supports a take-up rate. The claimant count tells you how many people claimed, and nothing about the size of the pool they were drawn from.
The arithmetic itself has a tighter limit. Every figure here is for England, Wales and Northern Ireland unless Scotland is named, every one assumes earnings or pension income only, and every one assumes the claim covers a full tax year.
What would change these numbers
Three things, in order of how much they would move.
A change to the personal allowance resets everything, because the transfer is defined as 10% of it. Unfreeze the allowance and the £1,260 and the £252 both move with it, and current law holds that frozen to 2030 to 2031. A change to the basic rate does the same through section 55B(3), since the reduction is given at that rate and nowhere else.
A change to the higher rate threshold moves the cliff. The £50,270 edge is the basic rate limit of £37,700 stacked on the £12,570 allowance, and both are frozen in the same section of the same Act. While the freeze holds, any recipient whose pay rises past £50,270 loses £252 they had the year before, without any tax rate changing.
What would not change the conclusion is the relief being made more generous at the margin. The binding constraint for most couples is not the rate it is paid at. It is whether the lower earner's income stays under £11,310, and that is a fact about their pay, not about the tax system.