TL;DR
Marriage Allowance lets the lower-earning spouse or civil partner transfer £1,260 of their personal allowance to their partner, saving up to £252 per year on the higher earner's tax bill. Claims can be backdated 4 tax years, worth up to £1,008 as a lump sum. The lower earner must earn under £12,570. Apply free at gov.uk in under 10 minutes.
Last reviewed: 10 May 2026 · Author: Chandraketu Tripathi (CK), Director-level finance editor
What Is Marriage Allowance and How Does It Work?
Marriage Allowance is a UK government tax break that allows a married person or civil partner to transfer a fixed portion of their personal tax-free allowance to their spouse or civil partner, reducing the recipient's income tax bill. It was introduced by the Finance Act 2014 and came into effect from 6 April 2015.
The transfer amount is fixed at 10% of the personal allowance, rounded to the nearest whole pound. For 2026/27, with the personal allowance at £12,570, the transfer amount is £1,260. The tax saving for the receiving partner is £1,260 x 20% = £252 per year. This is a saving, not a refund: it reduces the tax the higher earner owes in that tax year.
Eligibility conditions as at May 2026:
- You must be married or in a civil partnership (cohabiting couples do not qualify)
- The transferring spouse must have an income at or below the personal allowance of £12,570
- The receiving spouse must be a basic-rate taxpayer (income between £12,570 and £50,270 in 2026/27)
- Neither spouse can be a non-UK resident for tax purposes
The receiving partner must be a basic-rate taxpayer, not a higher-rate taxpayer. If the receiving partner pays tax at 40%, they cannot receive the Marriage Allowance - the allowance only produces a saving at 20%.
The allowance is currently frozen at £12,570 following the government's freeze on personal allowances through to at least 2028. The transfer amount (£1,260) and maximum saving (£252) have therefore been unchanged since 2021/22.
How to Calculate Whether Marriage Allowance Is Worth Claiming
The calculation is straightforward. The higher-earning partner's tax code gains a suffix "M" (for Marriage Allowance received), effectively increasing their tax-free income from £12,570 to £13,830. The lower earner's code gains a suffix "N" (for transferring), reducing their personal allowance to £11,310.
For the lower earner, the impact is only relevant if they have income below £12,570 and above £11,310 - in that range, they would start paying 20% tax on the transferred portion. If the lower earner has income at or below £11,310, or has no income at all, transferring £1,260 of unused allowance costs them nothing and saves the higher earner £252.
Example 1 - No earnings on the lower earner's side: Sarah has no income. Her husband Tom earns £35,000 and pays tax at 20%. Sarah transfers her unused personal allowance (she has no use for it). Tom's tax-free income rises by £1,260. His tax bill reduces by £252. Over 4 years backdated: £1,008 refund.
Example 2 - Lower earner with some income: Emma earns £10,000 (below the £12,570 threshold). Her wife Claire earns £28,000 and pays basic rate tax. Emma transfers £1,260. Her remaining personal allowance is £11,310. Since Emma earns £10,000, she is £1,310 below her reduced allowance - she still pays no tax. Claire saves £252 per year.
Example 3 - The break-even check: If the lower earner earns between £11,310 and £12,570, transferring the allowance may cause them to pay a small amount of tax on previously exempt income. Calculate whether the higher earner's saving (£252) outweighs the lower earner's new tax liability before applying.
How to Apply for Marriage Allowance: Step by Step
- Confirm eligibility: The lower earner (the one whose income is below £12,570) makes the application - not the higher earner. Check that neither spouse is a higher-rate taxpayer.
- Apply online: Visit gov.uk/apply-marriage-allowance. The lower earner signs in with their Government Gateway credentials. The application takes approximately 10 minutes.
- Provide partner's details: You will need your spouse or civil partner's National Insurance number and date of birth.
- Select years to include: The online system allows you to backdate the claim for up to 4 prior tax years if you were eligible but had not claimed. Select all applicable years.
- Backdated refund paid to the higher earner: HMRC processes the backdated tax saving as a lump-sum payment to the higher-earning spouse. Current-year savings are applied via a tax code change.
- Marriage Allowance is renewed automatically: Once claimed, the allowance continues year-on-year unless you cancel it or your circumstances change. HMRC updates tax codes at the start of each new tax year automatically.
If either partner is self-assessment, the savings are claimed through the annual self-assessment return rather than tax code adjustment. The lower earner selects the "Transfer Marriage Allowance" option in the return, and the benefit is applied to the higher earner's return for the same year.
Common Scenarios and Edge Cases
Scenario 1 - One partner goes above the basic-rate threshold: If the receiving partner's income rises above £50,270 during the year, they become a higher-rate taxpayer and are no longer eligible to receive the Marriage Allowance for that year. HMRC will cancel the allowance and may issue a tax underpayment notice. Notify HMRC promptly if either partner's income is approaching this threshold to avoid a retrospective bill.
Scenario 2 - Recently married or civil partnered: You can apply in the same tax year you married. The allowance is granted for the full year rather than pro-rated from the date of the marriage. Claims for the year of marriage and up to 4 prior years are available, subject to eligibility in those years.
Scenario 3 - Claiming for a deceased spouse: If your spouse or civil partner has died, you can claim Marriage Allowance for the year of their death and for up to 4 years before it, provided they would have been eligible. The claim is made by the surviving spouse on behalf of the deceased's estate. The refund is paid to the surviving spouse directly, not to the estate.
Scenario 4 - Both partners working part-time: If both partners work part-time and both earn below the personal allowance, neither owes income tax and the Marriage Allowance provides no benefit - there is no tax liability for the receiving partner to reduce. The allowance only produces a saving when the receiving partner has a positive tax liability.
Scenario 5 - One partner on Universal Credit: Marriage Allowance does not affect Universal Credit entitlement directly, as UC is calculated on household income net of taxes. However, a slightly higher tax code for the receiving partner could marginally reduce PAYE deductions and therefore increase net monthly pay slightly, which may affect the UC award by a small amount. The UC interaction is usually de minimis and does not justify avoiding the claim.
Time Limits and Backdating Deadlines
| Tax Year | Backdating Deadline | Saving (£252/year) |
|---|---|---|
| 2021/22 | 5 April 2026 | £252 - deadline imminent |
| 2022/23 | 5 April 2027 | £252 |
| 2023/24 | 5 April 2028 | £252 |
| 2024/25 | 5 April 2029 | £252 |
| 2025/26 (current) | Ongoing via tax code | £252 |
Maximum 4-year backdated lump sum: £1,008. This is in addition to ongoing annual savings of £252 going forward. Total 5-year benefit for a couple claiming now: £1,260.
What You Keep: Financial Impact Over Time
The Marriage Allowance generates a guaranteed £252 saving per year as long as both partners remain eligible. Unlike ISA or pension contributions, there is no limit on how many years it runs - it continues indefinitely until income circumstances change or you cancel it.
The lump-sum backdated payment is made directly to the higher-earning spouse's bank account (or by cheque). It is not taxable income and does not affect the personal allowance for the following year. No administrative fee applies.
Over 10 years of claiming: £2,520 in tax savings at zero cost. Over 20 years: £5,040. For couples where the lower earner has permanently left the workforce (for example, to retire early or care for dependants), the benefit compounds across every year of the higher earner's working life.
Common Mistakes That Prevent or Reduce the Benefit
- Not knowing you qualify: An estimated 2.4 million eligible couples in the UK have not claimed Marriage Allowance, according to HMRC figures. Many assume it is means-tested or requires complex paperwork. The online claim takes under 10 minutes.
- The wrong partner applying: The lower earner (the one giving up the allowance) must make the application. The higher earner cannot initiate the transfer.
- Not backdating: Many couples who discover the allowance claim only for the current year. The system allows backdating up to 4 years in a single application - always select all eligible years.
- Forgetting to cancel if circumstances change: If the lower earner's income rises above the personal allowance, or the higher earner becomes a higher-rate taxpayer, the allowance should be cancelled. HMRC does not automatically detect all income changes mid-year. Failing to cancel can result in a tax underpayment demand against the higher earner.
- Assuming cohabiting couples qualify: Marriage Allowance is available only to married couples and civil partners, not cohabiting partners. There is no equivalent allowance for unmarried couples under current UK tax law.
Important Disclaimer: Kaeltripton.com is an independent editorial publisher, not authorised or regulated by the FCA. Content is for informational purposes only and does not constitute financial, legal or tax advice. Marriage Allowance rules are set by HMRC under the Finance Act 2014. Always verify your specific circumstances at gov.uk before applying.
Frequently Asked Questions
Can I claim Marriage Allowance if my spouse is self-employed with variable income?
Yes, provided your spouse's total income for the tax year falls below the personal allowance of £12,570. For self-employed individuals, income is assessed annually through self-assessment. In years where income is above £12,570, the transfer cannot apply (or should be cancelled). In lower-income years, the transfer is valid. Self-employed lower earners claim via the "Transfer Marriage Allowance" option in their self-assessment return, rather than through the online portal.
What happens to the Marriage Allowance if we divorce or separate?
Marriage Allowance automatically ends in the tax year of legal separation, divorce, or dissolution of a civil partnership. If you separated during 2025/26, the allowance applies for the full year but must not be renewed for 2026/27. HMRC should be notified as soon as the legal status changes. Any overpayment of the allowance in the year of separation may need to be repaid through an amended tax code or self-assessment return. Notify HMRC promptly to avoid a retrospective underpayment demand.
I applied years ago but never received confirmation - am I getting the savings?
Check the receiving partner's tax code on their payslip or P60. A code ending in "M" confirms Marriage Allowance is being applied. If you see the standard code (e.g. 1257L without an M suffix), the allowance is not being received. Log into the Personal Tax Account at gov.uk to check the active status. If it does not show as active, reapply - the system will not duplicate the claim for years already processed.
Can both partners claim Marriage Allowance at the same time?
No. The allowance flows in one direction: from the lower earner (who transfers) to the higher earner (who receives). Only one partner is eligible to transfer, and only one can receive. If both partners earn above the personal allowance, neither qualifies. If both earn below the personal allowance, neither has a tax liability to reduce and the claim produces no benefit.
Does Marriage Allowance affect my entitlement to pension tax relief?
No. Pension contributions and tax relief are calculated separately from the Marriage Allowance. Receiving Marriage Allowance changes your tax code (adding £1,260 to your tax-free band) but does not affect the pension annual allowance, the method of pension relief (net pay or relief at source), or your eligibility for personal contributions. The two benefits are entirely independent and can both be claimed simultaneously.
How We Verified This Information
The eligibility conditions, transfer amounts, and backdating rules in this article were verified against HMRC's official Marriage Allowance guidance at gov.uk and cross-referenced with the Finance Act 2014 and the Income Tax Act 2007 via legislation.gov.uk. The 2026/27 personal allowance and transfer amount were confirmed against HMRC's rates and thresholds for 2026/27 as published in May 2026.