Published: June 2026 | Fact-Checked & Audited By: David Vance, CTA FCA (Chartered Tax Advisor & Accountant)
This guide is fully updated for the 2026/27 HMRC tax year. All calculations and tax rules have been audited against official UK legislation.
The Marriage Allowance is a valuable tax perk in the UK designed to support couples where one partner earns less than the Personal Allowance. Under the rules, the lower earner can transfer 10% of their unused Personal Allowance to their higher-earning partner. For the 2026/27 tax year, this allows you to transfer **£1,260** of allowance, reducing the higher earner’s tax bill by up to **£252**. One of the most powerful features of this scheme is the ability to backdate claims. If you were eligible but did not claim in previous years, you can request a refund dating back up to 4 years, yielding a lump-sum tax rebate of over £1,200.
Marriage Allowance Eligibility Criteria
To qualify for the Marriage Allowance and the subsequent tax refund, couples must meet the following HMRC conditions:
- Marital Status: You must be married or in a registered civil partnership. (Cohabiting couples who are not married do not qualify).
- Lower Earner: One partner must have an annual income below the Personal Allowance threshold (standardly £12,570 for 2026/27).
- Higher Earner: The other partner’s income must fall within the Basic Rate tax band (£12,571 to £50,270 in England, NI, and Wales; or under £43,662 in Scotland). If the higher earner is a Higher or Additional Rate taxpayer, the couple is ineligible.
How the Transfer Saves Tax
By transferring £1,260 of personal allowance to the basic rate partner, you are effectively shifting £1,260 of income from the 20% tax bracket to the 0% tax bracket. This results in a flat saving of £1,260 x 20% = £252. The lower earner’s personal allowance drops to £11,310. If the lower earner has some small earnings, this transfer could mean they pay a tiny amount of tax, but the saving of £252 on the higher earner’s salary still represents a net benefit for the household.
Backdating Your Claim for a Lump Sum Refund
If you have been married for several years and meet the criteria, you can backdate your claim for up to 4 tax years. HMRC will pay this rebate as a lump-sum check or direct bank transfer. The maximum savings per year depend on the historical rates:
| Tax Year | Personal Allowance Transferred | Maximum Tax Saving (Refund) |
|---|---|---|
| 2026/27 (Current) | £1,260 | £252 (applied to tax code) |
| 2025/26 (Backdated) | £1,260 | £252 (lump sum) |
| 2024/25 (Backdated) | £1,260 | £252 (lump sum) |
| 2023/24 (Backdated) | £1,260 | £252 (lump sum) |
| 2022/23 (Backdated) | £1,260 | £252 (lump sum) |
| Total Potential Lump Sum | – | £1,008 (Plus current year savings) |
To analyze how transferring your allowance affects your combined net household income, use our Marriage Allowance Calculator.
Frequently Asked Questions: Marriage Allowance Refunds
1. How does backdating the Marriage Allowance work?
You can backdate your Marriage Allowance claim for up to 4 previous tax years, and HMRC will pay any refund due as a lump-sum cheque or bank transfer. For a backdated claim, you must have met the eligibility criteria for each year you are claiming.
2. How much is the Marriage Allowance tax refund?
The maximum tax refund for the current year is £252; backdating a claim for the maximum 4 years can yield an additional lump-sum refund of £1,008. This represents a total household saving of £1,260.
3. Can cohabiting couples claim the Marriage Allowance?
No, you must be legally married or in a registered civil partnership to claim the Marriage Allowance. Cohabiting couples, regardless of how long they have lived together, are not eligible under HMRC rules.
4. What is the income limit for the higher-earning partner?
The higher earner’s income must be within the Basic Rate band, which is £12,571 to £50,270 in England, Wales, and Northern Ireland for the 2026/27 tax year. In Scotland, the limit is £43,662.
5. What happens if the lower-earning partner has a small job?
If the lower earner works but earns less than £12,570, they can still transfer their allowance, but their personal allowance will drop to £11,310. If their income exceeds £11,310, they may have to pay a small amount of tax, but the couple will still save overall.
6. Do I have to apply for Marriage Allowance every year?
No, once you apply, the Marriage Allowance transfer is applied automatically to your tax codes every year until you cancel it or your circumstances change. You do not need to reapply annually.
7. How do I apply for the Marriage Allowance refund?
You can apply for free directly on the gov.uk website by searching for “Marriage Allowance” and logging in with your Government Gateway credentials. You will need both partners’ National Insurance numbers.
8. What happens to the Marriage Allowance if we divorce?
If you divorce or dissolve your civil partnership, you must contact HMRC to cancel the Marriage Allowance transfer. The timing of the cancellation depends on who cancels it and when during the tax year.
9. Can I claim if one partner has died?
Yes, you can make a backdated claim for Marriage Allowance on behalf of a partner who has died, going back up to 4 tax years. Contact HMRC directly to process a deceased partner claim.
10. Does claiming Marriage Allowance affect our State Pension?
No, claiming the Marriage Allowance has no impact on your State Pension or National Insurance records. It only affects your personal allowance and income tax calculations.