Marriage Allowance Calculator UK
How this calculator works
Models the £1,260 allowance transfer and compares combined Income Tax before and after. The recipient must normally be a basic-rate taxpayer and the transferor must not pay Income Tax.
Use the Marriage Allowance Calculator to estimate whether transferring part of one partner’s Personal Allowance could reduce your combined Income Tax bill. It is intended for married couples and civil partners where one person has a relatively low income and the other is not liable to Income Tax above the basic rate.
Marriage Allowance rules and rates are established in tax legislation and administered by HM Revenue and Customs. The current eligibility conditions, claim process and backdating rules are explained in the official GOV.UK Marriage Allowance guidance.
What is Marriage Allowance?
Marriage Allowance lets an eligible lower-income spouse or civil partner transfer £1,260 of their Personal Allowance to their partner, potentially reducing the recipient’s Income Tax by up to £252 for the tax year.
The allowance is available only to couples who are married or in a civil partnership. Living together without being married or in a civil partnership does not qualify.
For the 2026/27 tax year, the standard Personal Allowance is £12,570. An eligible transfer reduces the lower earner’s allowance by £1,260 to £11,310. The recipient receives a tax reduction calculated at the 20% basic rate, rather than an additional cash payment or a £1,260 refund.
How does the Marriage Allowance Calculator work?
The calculator uses the information entered for both partners to estimate the tax effect of transferring the fixed Marriage Allowance and the potential combined saving.
The calculation compares the couple’s estimated Income Tax position before and after the transfer. It considers the lower earner’s reduced Personal Allowance and the tax reduction potentially available to the receiving partner.
The maximum headline saving is calculated as follows:
| Calculation | 2026/27 amount |
|---|---|
| Personal Allowance transferred | £1,260 |
| Basic rate used for the tax reduction | 20% |
| Maximum recipient tax reduction | £252 |
| Lower earner’s Personal Allowance after transfer | £11,310 |
The receiving partner can benefit only to the extent that they have enough Income Tax liability. The couple’s net saving may also be less than £252 if reducing the lower earner’s Personal Allowance causes that person to pay additional tax.
Who may qualify for Marriage Allowance?
You may qualify if you are married or in a civil partnership, the transferring partner normally has income below their Personal Allowance, and the receiving partner is not liable to tax above the basic rate.
In England, Wales and Northern Ireland, the recipient’s income will commonly be between £12,571 and £50,270 where the standard Personal Allowance applies. These figures are only a general guide because taxable income, adjusted net income, allowances and reliefs can change the final position.
For a Scottish taxpayer, the recipient must generally pay Income Tax at the starter, basic or intermediate rate. Scottish Income Tax bands differ from those applying elsewhere in the UK, so eligibility should be checked using the recipient’s actual tax position rather than salary alone.
Receiving a pension does not by itself prevent a claim. A person living abroad may also qualify if they are entitled to a UK Personal Allowance. Dividends, savings interest, property income, taxable benefits and self-employment profits can affect eligibility and should not be left out when assessing total income.
Illustrative Marriage Allowance example
In this illustrative example, a couple could save £252 because the lower earner remains below their reduced Personal Allowance and the recipient has enough basic-rate Income Tax liability.
Illustrative assumptions: the calculation is for 2026/27; the couple are married throughout the relevant period; one partner has taxable income of £9,500; the other has taxable income of £35,000; both receive the standard Personal Allowance; neither has other income, adjustments or reliefs; and the recipient is an England, Wales or Northern Ireland taxpayer.
| Stage | Lower earner | Receiving partner |
|---|---|---|
| Taxable income | £9,500 | £35,000 |
| Personal Allowance before transfer | £12,570 | £12,570 |
| Marriage Allowance adjustment | £1,260 transferred | Tax reduced by up to £252 |
| Lower earner’s allowance after transfer | £11,310 | Not applicable |
| Estimated combined saving | £252 | |
The lower earner remains below the reduced allowance of £11,310, so the transfer does not create an Income Tax charge for them. The receiving partner’s tax is reduced by £252, assuming they otherwise owe at least that amount.
As a contrasting illustrative case, assume the lower earner instead receives £12,000 and all other assumptions remain unchanged. The reduced allowance could leave £690 taxable, producing approximately £138 of Income Tax at 20%. If the recipient saves £252, the couple’s net saving would be approximately £114 rather than the full £252.
Why might the result be less than £252?
The result may be lower because the recipient has insufficient Income Tax liability or because transferring the allowance causes the lower earner to pay more tax.
- The lower earner’s income is above the reduced allowance of £11,310.
- The receiving partner owes less than £252 of Income Tax before the reduction.
- Either partner has income not included in the estimate, such as dividends, savings interest or taxable benefits.
- A relief, expense claim or other allowance changes either partner’s taxable income.
- The receiving partner becomes liable to tax above the basic rate or, in Scotland, above the intermediate rate.
- A partner’s Personal Allowance differs from the standard amount.
Use the Income Tax Calculator if you also want a broader estimate of tax based on an individual’s income. Marriage Allowance does not reduce National Insurance contributions.
Can a Marriage Allowance claim be backdated?
An eligible claim can normally be backdated for up to four previous tax years, provided the couple met the conditions in each year claimed.
The allowance and resulting tax reduction are calculated separately for each tax year using the rules and amounts that applied during that year. GOV.UK currently states that claims can be backdated to 6 April 2022, covering the 2022/23 tax year, where the eligibility conditions were satisfied.
Backdating is not automatically included merely because the couple qualifies in the current year. Each earlier year should be checked individually, particularly where income or tax residence changed. A claim may still be possible after a partner has died, but HMRC’s specific claim procedure should be followed.
How is Marriage Allowance claimed?
The lower-income partner normally makes the claim through HMRC, and an accepted transfer usually continues for later tax years until it is cancelled or the couple’s circumstances change.
For employees and pension recipients, HMRC may adjust the partners’ PAYE tax codes. The transferring partner may receive a code ending in “N”, while the recipient may receive one ending in “M”. People completing Self Assessment may instead see the adjustment reflected in their tax calculation.
A claim should be reviewed or cancelled if income changes, the relationship ends or either partner no longer meets the conditions. Continuing to receive an adjustment after eligibility has ended could lead to an underpayment that HMRC later collects.
Marriage Allowance and Married Couple’s Allowance
Marriage Allowance and Married Couple’s Allowance are separate tax reductions, and a couple cannot receive both at the same time.
Married Couple’s Allowance may be relevant where at least one spouse or civil partner was born before 6 April 1935. Its eligibility rules and calculation differ, so eligible older couples should compare the two before applying. Further details are available in the GOV.UK Married Couple’s Allowance guidance.
Common Marriage Allowance mistakes
Common errors include treating the transfer as a cash payment, omitting other taxable income and assuming every eligible couple automatically saves the full £252.
- Entering take-home pay instead of the relevant taxable income.
- Ignoring pension, property, savings, dividend or self-employment income.
- Assuming an unmarried couple can claim.
- Trying to transfer an arbitrary amount rather than the fixed statutory amount.
- Using England, Wales or Northern Ireland tax thresholds for a Scottish taxpayer.
- Overlooking tax already due from the lower earner after their allowance is reduced.
- Assuming the allowance reduces National Insurance or increases means-tested benefits directly.
- Failing to reassess eligibility after income or relationship circumstances change.
Important calculator limitations
The calculator provides an indicative tax saving and cannot reproduce every HMRC adjustment or determine eligibility conclusively in complex cases.
The result may not fully account for unusual tax codes, multiple employments, benefits in kind, foreign income, residence issues, the Personal Allowance taper, carried-back adjustments, tax collected for an earlier year or interactions with specialised reliefs.
Marriage Allowance affects the couple’s Income Tax calculation, but the calculator does not submit a claim to HMRC. Eligibility and the final adjustment are determined by HMRC using each partner’s complete tax record.
This calculator provides estimates only. Individual circumstances, income sources, allowances and reliefs differ, and HMRC’s final calculation may not match the result shown; professional tax advice may be appropriate where eligibility or the tax treatment is uncertain.