Marriage Allowance

If you are married or in a civil partnership and looking for ways to reduce your tax bill, this guide explains everything you need to know about the Marriage Allowance. It explains what it is, who is eligible, how it works, how to apply, what to watch out for and frequently asked questions. Explained in plain English, this easy to follow guide will help you understand your options and make the right choice.

What is Marriage Allowance?

The Marriage Allowance is a tax rule that allows one partner to transfer part of their unused Personal Allowance to their spouse or civil partner. In simple terms: if one partner earns less than the tax-free amount and the other is a taxpayer at the basic rate, you may be able to save tax as a couple.

Your Personal Allowance is the amount you can earn in a tax year before you start paying Income Tax. When you transfer part of it under the Marriage Allowance, your partner’s taxable income decreases, meaning they pay less tax. In the tax year 2025/26 the transferable amount is £1,260 and the saving could be up to £252. [Check official guidance on gov.uk]

Why does it matter?

It could reduce your household tax bill, giving you extra money each year without changing jobs or income.
It is simple to apply for and continues automatically each year once approved, until your circumstances change.
You can backdate the claim to previous tax years (up to 4 years) in many cases, increasing the benefit.
It works for many couples where one partner earns very little or nothing and the other pays tax at the basic rate — but many eligible couples don’t claim it.

Who is eligible for Marriage Allowance?

You can benefit from the Marriage Allowance if **all** the following apply:

You are married or in a civil partnership.
One partner (the “donor”) has income below their Personal Allowance (so they pay little or no Income Tax).
The other partner (the “recipient”) pays tax at the basic rate (in England, Wales and Northern Ireland this means their income is between the Personal Allowance and the higher-rate threshold for that year; in Scotland similar rules apply). [See official guidance on gov.uk]
Both partners were born on or after 6 April 1935** if you want the standard Marriage Allowance. (If one of you was born before that date you might instead be eligible for the Married Couple’s Allowance.)

**Note:** Cohabiting couples who are not married or in a civil partnership cannot claim this allowance.

Key figures for 2025/26

Personal Allowance: £12,570 (the amount you can earn before paying Income Tax) for most people.
Transferable amount under Marriage Allowance: £1,260 in 2025/26.
Maximum potential tax saving: up to £252 in that tax year.
Backdating: You can claim for the current tax year and up to 4 previous tax years if you were eligible in those years.

How does Marriage Allowance work?

The mechanics are relatively straightforward:

The partner with the lower income (the donor) gives up part of their Personal Allowance — up to a specified amount (£1,260 in 2025/26).
The partner with the higher income (the recipient) receives this transfer, reducing their taxable income by the same amount.
Because taxable income is lower, the recipient pays less tax. Because the donor is earning under their Personal Allowance anyway, their tax position stays the same (they pay little or no tax).
The result: the couple in total pays less tax than they would if no transfer happened.

Here is a simplified example:

Jane earns £10,000 a year, so she pays no Income Tax (because her income is under £12,570). Her husband, Tom, earns £20,000 and pays basic-rate tax. Jane transfers £1,260 of her unused Personal Allowance to Tom. Tom’s taxable income falls by £1,260, meaning his tax bill falls by up to £252. The couple keeps more of their income.

You don’t need to re-apply each year: once your claim is accepted, it remains in place until one of your circumstances changes (for example income changes, you separate, or one of you no longer meets eligibility). You must tell HMRC if your situation changes.

How to apply for Marriage Allowance

Applying is free and can usually be done online via your Personal Tax Account on the government website. Here are the steps:

Go to the official page [Marriage Allowance – gov.uk].
The partner with the lower income (the donor) logs in (or creates) their Government Gateway / Personal Tax Account.
Provide your National Insurance numbers and date of marriage or civil partnership.
Choose whether you want to apply just for the current tax year or include backdating for up to 4 previous years (if eligible).
Submit the claim. HMRC will update your tax codes: the donor will get an “N” suffix, the recipient an “M” suffix (to reflect the transfer) and you’ll receive a confirmation letter.

If you cannot apply online you can apply by phone or by post—however online is quicker and recommended. [See guidance on how to apply and backdate claims on gov.uk]

Backdating your claim

You can claim the Marriage Allowance not only for the current tax year, but also for earlier years—up to **4 tax years** prior—provided you were eligible in those years. That means you could receive a refund or adjustment for each of those years. This can increase the total amount saved substantially.

For example: if you were eligible in 2021/22, 2022/23, 2023/24 and 2024/25 as well as the current 2025/26, you might claim for all five years (current + four previous), multiplying the yearly saving. Always check eligibility carefully for each year.

What happens after you apply?

Your tax codes will be updated for both partners. The donor’s code gets an “N” suffix and the recipient’s gets an “M” suffix.
From the next available payslip—if you are paid via PAYE—you should see reduced tax for the recipient. If you backdated, you may receive a refund or adjustment.
The transfer stays in place year-to-year unless you or your partner’s circumstances change and you cancel or HMRC cancels the claim.
If circumstances change (for example the donor’s income rises above the Personal Allowance, or the recipient’s income rises above the basic-rate threshold, or you separate), you should notify HMRC or cancel the claim to avoid penalty or loss.

When might Marriage Allowance stop being beneficial?

Although the scheme is straightforward, there are some situations where it may not benefit you. You should check carefully before applying:

If the donor’s income increases to above the Personal Allowance, they start paying Income Tax and the transfer might reduce their own tax-free allowance too much.
If the recipient’s income increases so they become a higher-rate taxpayer (for example earning over £50,270 in England & Wales for 2025/26) the benefit may be lost or it may even make you worse off.
If one of you starts claiming certain benefits, or your tax status changes, the allowance could affect other calculations (for example your tax code, or eligibility for some benefits). Always check with HMRC or a tax adviser.

In some cases you might decide **not** to apply until your income is stable and you’re confident you will benefit each year.

Common questions & answers

Q: Can unmarried couples who live together claim Marriage Allowance?

A: No. The allowance only applies to couples who are legally married or in a civil partnership. Living together, however long, does not qualify you.

Q: Does having children affect eligibility?

A: No. Having children or dependents does not affect the basic eligibility for the Marriage Allowance. The rules are about income, tax status, marriage or civil partnership, not children.

Q: Can we apply if one partner is already retired and earns pension income?

A: Yes, provided the basic conditions are met (one partner earns under the Personal Allowance and the other pays basic-rate tax). Pension income counts as taxable income, so you’ll need to check how much total income each partner has.

Q: What if my partner was born before 6 April 1935?

A: If one partner was born before that date, you may qualify instead for the Married Couple’s Allowance, which is a different tax relief for older couples. It may be more generous depending on your income and status.

Q: If we get divorced or one partner dies, what happens to the claim?

A: If the couple separates, or one partner dies, the claim ends for future tax years. You should cancel the claim or tell HMRC if your situation changes. Any backdated tax savings you received for previous years usually remain.

Q: Can we both claim at the same time for a second job or side income?

A: The allowance allows only one partner (the donor) to transfer part of their allowance to the other partner (the recipient). You cannot both apply as donors each transferring to the other. But you can apply for different tax years if eligible again, the same rule applies.

Q: How much will we save in total?

A: For 2025/26 the maximum saving is up to £252 (if you transfer £1,260 and the recipient pays basic-rate tax at 20%). If you backdate the claim for four previous years you could save multiple times that amount depending on eligibility in each year. Always check the exact numbers for each tax year.

Step-by-step checklist before you apply

Check that you are legally married or in a civil partnership.
Check that one partner earns less than the Personal Allowance (for 2025/26 that’s £12,570) and pays little or no tax.
Check that the other partner pays tax at the basic rate only (not higher rate) and their income is within the relevant threshold.
Gather your National Insurance numbers, date of marriage/civil partnership, and login access for the Government Gateway / Personal Tax Account.
Decide if you will apply for just the current year or include backdating for previous years (up to 4 years) if you were eligible then.
Apply online (fastest) via the official government site. [Apply for Marriage Allowance]
Wait for HMRC confirmation and check the tax codes on your payslip (look for “M” and “N” suffixes for recipient and donor respectively).
Keep a note of when to review your eligibility — if income changes, you should cancel or update the claim to avoid problems.

When should you review or cancel the claim?

Once your claim is approved, you don’t need to re-apply each year unless your situation changes. But you should review the claim if any of the following happen:

The donor partner’s income rises above the Personal Allowance threshold (so they start paying tax).
The recipient partner’s income rises so they are no longer a basic-rate taxpayer or move into higher rate tax.
You separate, divorce or one partner dies.
You enter into a contract with significant other income (self-employment, investment) changing your tax band.

If any of these changes happen, you and your partner need to tell HMRC or cancel the claim to avoid being worse off.

How this fits with other tax allowances

It’s worth knowing how the Marriage Allowance fits in with other tax reliefs:

The Marriage Allowance is for couples where one partner earns under the Personal Allowance and the other is a basic-rate taxpayer.
The Married Couple’s Allowance is for couples where one partner was born before 6 April 1935 — the rules are different and often more generous for older couples. [See gov.uk]
You cannot claim both the Marriage Allowance and the Married Couple’s Allowance at the same time — check which one you are eligible for and which gives the most benefit.
The transfer does not change your tax band (basic/rate/higher) or your personal allowance beyond the amounts specified — it simply transfers a fixed amount of allowance from one partner to the other.

Common mistakes and how to avoid them

Here are some pitfalls to watch out for:

Assuming you’ll benefit without checking — if the recipient moves into higher rate tax or the donor starts paying tax, the saving could reduce or be lost.
Not backdating when you were eligible — checking previous years can increase the total benefit.
Not telling HMRC when something changes — this can cause tax bills or penalties later.
Using third-party services that charge a fee – you can apply for free via the government website.
Thinking cohabiting = eligibility — only married or civil partnered couples qualify for the Marriage Allowance.

Summary

The Marriage Allowance is a useful tax relief for many couples in the UK where one partner is a non-taxpayer and the other is a basic-rate taxpayer. It allows the lower-earning partner to transfer £1,260 of their Personal Allowance (in 2025/26) to their partner, reducing their household tax bill by up to £252 each year. You can also claim back up to four tax years if you were eligible in those years.

To benefit, check your eligibility carefully, apply via the official site, monitor your tax codes afterwards, and review your claim annually or when your income changes. With a little attention, you could increase your take-home pay without changing your job or salary.

For detailed official guidance and to apply, visit: Marriage Allowance – gov.uk.