Question 1

Who qualifies for Marriage Allowance?

Accepted Answer

You must be married or in a civil partnership. The lower earner must have income below £12,570 (the Personal Allowance)  -  meaning they pay no Income Tax or only pay tax on income above their allowance. The higher earner must be a basic-rate taxpayer with income between £12,571 and £50,270. If the higher earner is a higher-rate (40%) or additional-rate (45%) taxpayer, Marriage Allowance cannot be claimed.

Question 2

How much is Marriage Allowance worth?

Accepted Answer

The lower earner transfers £1,260 of their Personal Allowance to their spouse. This reduces the higher earner's Income Tax bill by £1,260 × 20% = £252 per year. Over time this adds up: £252/year for as long as the arrangement is in place. If you backdate the claim for all four eligible previous tax years (2021/22 through 2024/25), you receive a one-off lump sum of £1,008 on top of the ongoing £252/year going forward.

Question 3

How do I claim Marriage Allowance?

Accepted Answer

The quickest way is online at gov.uk  -  the process takes around five minutes and requires both partners' National Insurance numbers. HMRC then updates both tax codes: the lower earner's code drops to 1131L (reflecting the £11,310 remaining allowance) and the higher earner's rises to 1383M. The tax saving is applied automatically through PAYE. If either partner completes a Self Assessment tax return, the claim can be made there instead.

Question 4

Can I backdate a Marriage Allowance claim?

Accepted Answer

Yes  -  HMRC allows claims to be backdated for up to four complete tax years. As of 2026/27 that means you can include 2022/23, 2023/24, 2024/25 and 2025/26 in addition to the current year. The backdated amounts (£252 per year) are paid as a lump sum, usually by cheque or bank transfer. The claim for the current and future years is applied via your tax code going forward.

Question 5

Can unmarried or cohabiting couples claim Marriage Allowance?

Accepted Answer

No. Marriage Allowance is only available to legally married couples and civil partners. Cohabiting partners, regardless of how long they have been together or whether they have children, cannot claim it. If you want to benefit from tax-efficient income splitting, marriage or civil partnership is a prerequisite. Couples who are engaged but not yet married also cannot claim until the marriage is legally registered.

Question 6

What happens to Marriage Allowance if we divorce or separate?

Accepted Answer

Marriage Allowance is cancelled at the end of the tax year in which you divorce or legally separate. HMRC will adjust both partners' tax codes from the following April. The saving stops, and the personal allowance is restored to its standard level for both parties. In most cases you do not need to inform HMRC proactively  -  the change in marital status should be captured through normal HMRC records  -  but it is worth checking your tax codes revert correctly.

Question 7

Does Marriage Allowance affect my State Pension entitlement?

Accepted Answer

No. Transferring part of your Personal Allowance to your spouse has no effect on either partner's National Insurance record or State Pension entitlement. State Pension is based on qualifying NI years (you need 35 for the full new State Pension), not on how your tax allowances are allocated. Marriage Allowance is purely an income tax adjustment.

Marriage Allowance Calculator UK 2026/27