Losing a spouse is devastating enough without having to navigate the complexities of HMRC forms and tax entitlements. Yet thousands of widows and widowers in the UK are unknowingly leaving money on the table every year — sometimes as much as £1,260 in unclaimed tax relief — simply because they do not know that marriage allowance can still be claimed after a partner dies.

This guide exists specifically for that situation. It answers every question you are likely to have: whether you can still claim marriage allowance if your spouse has passed away, how far back you can go, who actually applies, and exactly what to do step by step. It is written in plain English, not tax jargon, and updated for the 2025/26 tax year.

What Is Marriage Allowance and Why Does Death Complicate It?

Marriage allowance is a UK tax relief that lets the lower-earning partner in a married couple or civil partnership transfer up to £1,260 of their unused personal allowance to their higher-earning spouse. For the 2025/26 tax year, this can reduce the higher earner’s tax bill by up to £252 per year.

Most guides stop there. What they do not explain is what happens when one partner dies mid-claim, or when a surviving spouse realises they were eligible for marriage allowance during years their partner was alive but never claimed it. Both of these scenarios are handled differently by HMRC, and both can result in a meaningful refund if you know what to ask for.

Can You Claim Marriage Allowance After Your Spouse Dies?

Yes — in two distinct ways, and understanding the difference matters enormously.

Scenario 1: You Were Already Claiming Marriage Allowance When Your Spouse Died

If marriage allowance was active when your spouse passed away, HMRC continues to honour the allowance for the remainder of that tax year. You do not need to do anything immediately. The tax code adjustment already in place remains valid until 5 April of the current tax year.

However, you must notify HMRC once the new tax year begins so the allowance is cancelled going forward — at that point, you are no longer married, and the eligibility condition is no longer met. Failing to cancel means you could receive an incorrect tax code and end up owing HMRC money. Our guide on when you must cancel marriage allowance covers exactly how to do this and what happens if you leave it too late.

Scenario 2: You Never Claimed Marriage Allowance During the Marriage — But You Were Eligible

This is where the most significant financial opportunity lies, and it is almost entirely absent from mainstream advice. If your late spouse met the eligibility conditions at any point during the past four tax years, you may be able to backdate a claim and receive a lump-sum refund — even though they are no longer alive.

HMRC’s guidance confirms that backdated claims can be made on behalf of a deceased spouse, but the process is not done online. It requires a paper or phone claim, and the executor or administrator of the estate is typically the one who initiates it during the administration period.

Key fact: HMRC allows backdated marriage allowance claims for up to four previous tax years. For a claim going back four years, this could mean a combined refund of up to £1,008 — paid either to the estate or directly to the surviving spouse, depending on circumstances.

Who Is Eligible to Claim Marriage Allowance After a Spouse’s Death?

Eligibility mirrors the standard marriage allowance criteria, but applied retrospectively to the years when your spouse was alive. To qualify for a backdated claim on a deceased spouse’s behalf, the following must have been true during the tax year(s) being claimed:

• You were legally married or in a civil partnership (cohabiting does not count)
• The lower-earning partner’s income was below £12,570 (the personal allowance threshold for 2025/26; it was slightly lower in earlier years)
• The higher-earning partner paid income tax at the basic rate (20%) only — not the higher rate (40%) or additional rate (45%). For a full explanation of where that threshold sits, see our guide on marriage allowance and the higher-rate threshold
• Neither partner was claiming the Married Couple’s Allowance (available only where at least one partner was born before 6 April 1935)

If those conditions were met in any of the last four tax years, a backdated claim is potentially valid. The years currently available are 2021/22, 2022/23, 2023/24, and 2024/25 (plus 2025/26 if applicable).

One thing worth checking before you apply: if your late spouse had savings interest, dividends, or rental income alongside a salary, their eligibility may have been affected by their total adjusted net income rather than their salary alone. Our article on how investment income affects marriage allowance eligibility explains this in full.

How Much Could You Actually Receive?

Step-by-Step: How to Make the Claim

If Your Spouse Died During the Current Tax Year

Step 1: Do nothing immediately. The existing allowance carries through to 5 April.

Step 2: After the tax year ends (or when you file a Self Assessment return), notify HMRC that your circumstances have changed. You can do this via your Personal Tax Account or by calling the HMRC Income Tax Helpline.

Step 3: Check whether you are due a refund for the portion of the year when the allowance was active. If HMRC adjusted your tax code midway through the year, you may have overpaid or underpaid. If you are unsure what your tax code should look like, our guide to marriage allowance tax codes — M, N, and 1131L explained walks through what each code means and how to read your payslip correctly.

If You Want to Backdate a Claim for Deceased Spouse’s Tax Years

This process cannot be done online. You have two options:

Option A — Phone HMRC directly: Call the Income Tax Helpline and explain that you wish to make a backdated marriage allowance claim on behalf of a deceased spouse. Have ready: both National Insurance numbers, the date of marriage, the date of death, and the tax years you are claiming for. Ask explicitly whether the claim should be made by you personally or by the estate’s executor.

Option B — Write to HMRC: Send a letter to the HMRC tax office explaining the claim, including all the information above plus your relationship to the deceased (surviving spouse or executor). HMRC’s processing time for postal claims is typically 8–12 weeks for estate-related matters.

Practical tip: If you are the executor of the estate, deal with marriage allowance as one of your first HMRC-related tasks. Refunds due to the deceased’s estate form part of the estate’s assets and must be recorded in the estate accounts. If you are the surviving spouse claiming in your own right, the refund goes directly to you.

What If the Wrong Partner Was the One Claiming?

Marriage allowance must always be initiated by the lower-earning partner — that is, the person transferring part of their personal allowance. If the wrong partner applied (for example, if the higher earner mistakenly initiated the claim), HMRC may have issued it incorrectly. After a death, this can cause confusion when the estate is being administered.

If you suspect the allowance was set up incorrectly at any point, contact HMRC and ask for a review. They can trace the claim history and correct any errors, which may actually result in a higher refund than you expected.

How Refunds Are Paid After a Death

Where a refund is owed on the deceased’s behalf, HMRC pays it differently depending on the circumstances:

• If the estate is still being administered: the refund is paid to the estate and distributed according to the will or intestacy rules
• If the estate has already been closed: HMRC may pay directly to the surviving spouse if they are the sole beneficiary, but this requires written confirmation
• If the surviving spouse made the claim in their own right (rather than on behalf of the deceased): payment goes directly to the survivor

Common Mistakes Widows and Widowers Make

Assuming the Claim Ends at Death

Many people assume that marriage allowance simply stops the moment a spouse dies. It does not. For the current tax year, it continues automatically. And for past years, a backdated claim remains available for up to four years. Not checking this is potentially the most expensive assumption a bereaved person can make.

Waiting Too Long

HMRC’s four-year backdating window is not extendable under normal circumstances. If your spouse passed away more than four years ago and you never claimed marriage allowance, the window may have already closed. If they passed away recently and you were eligible in earlier years, you may still be within the window — but do not delay.

Assuming You Need a Solicitor

You do not need a solicitor to make this claim. While probate solicitors sometimes handle it as part of estate administration, there is no legal requirement and no fee for a direct HMRC claim. If a solicitor is charging you to make this specific claim on your behalf, it is worth asking whether you could do it yourself with a phone call.

What Happens to the Tax Code After Your Spouse Dies?

When your spouse dies, their tax code becomes irrelevant — they are no longer earning income that needs a code. Your own tax code, however, may need to change. If you were the receiving partner (the one with the M suffix in your tax code), HMRC will revert your code to the standard personal allowance once the tax year ends or once they are notified of the death.

If you notice that your code still shows the M suffix after the following April, contact HMRC to have it corrected. Operating on an incorrect tax code means you are effectively getting a tax benefit you are no longer entitled to, which HMRC will eventually reclaim. For a full breakdown of what the M and N codes mean and how to verify your code is correct, see our dedicated guide on marriage allowance tax codes explained.

Special Case: Scottish Residents

Marriage allowance works the same way in Scotland regarding eligibility after death. The core calculation — up to £252 saving per year — remains the same, because marriage allowance is calculated against the UK basic rate of 20%, not Scottish rates. A Scottish resident claiming backdated marriage allowance after a spouse’s death follows the same process as anywhere else in the UK.

Frequently Asked Questions

Can I claim marriage allowance if my spouse died this tax year? Yes. The allowance continues until 5 April for the year in which your spouse died. You do not need to cancel it immediately, but you should inform HMRC at the start of the following tax year. See our full guide on when to cancel marriage allowance for the exact steps.

My spouse died three years ago. Is it too late to claim? Possibly not. If you were eligible in 2021/22, 2022/23, 2023/24, or 2024/25, you can still make a backdated claim. Contact HMRC by phone or post and explain you wish to backdate a claim for a deceased spouse.

Who receives the refund — me or the estate? This depends on how the claim is structured and whether the estate has been closed. In most cases, if you are making the claim as a surviving spouse in your own right, the refund comes to you. If the estate is still open, it may be paid to the estate.

Does remarriage affect a backdated claim for my late spouse? No. You can still claim marriage allowance for the years you were married to your late spouse even if you have since remarried. Each tax year is assessed on the circumstances that existed during that year.

I was the lower earner. Can I claim for the years I transferred the allowance to my late spouse? Yes. In this case, you were the one who transferred part of your personal allowance, and your spouse received the tax benefit. If your spouse overpaid tax as a result of not having the allowance correctly applied, the refund would go to the estate. Contact HMRC to check whether any adjustment is due.

Final Thoughts: Do Not Leave This Money Unclaimed

Grief is exhausting. Tax forms are the last thing you want to deal with when you have lost your partner. But marriage allowance after death is one of the rare cases where a relatively simple phone call to HMRC can unlock a meaningful sum of money — up to £1,260 if you claim all four backdated years.

The core message of this guide is straightforward: do not assume the allowance died with your spouse. Check whether you were eligible in the past four years, make the call or send the letter, and let HMRC process what you are rightfully owed.

If you want to understand more about how marriage allowance works in other complicated situations, our guides on separation and divorce, self-employed eligibility, and the hidden tax trap for lower earners are all worth reading alongside this one.

Action step: Call HMRC’s Income Tax Helpline (0300 200 3300, Monday to Friday, 8am to 6pm) and say: “I want to make a backdated marriage allowance claim following the death of my spouse.” Have both National Insurance numbers and your marriage date to hand.