Marriage Allowance Calculator

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How to Use This Marriage Allowance Calculator

1. Check your eligibility first - Tick each checkbox in the eligibility section. All four conditions must be met: you must be married or in a civil partnership, one partner must earn less than £12,570 per year, the higher earner must be a basic rate taxpayer (earning between £12,571 and £50,270), and both partners must have been born after 5 April 1935.
2. Enter the lower earner's annual income - This is the income of the partner who earns less than the Personal Allowance (£12,570). This person will be transferring part of their unused allowance to their spouse or civil partner.
3. Enter the higher earner's annual income - This is the income of the partner who will receive the transferred allowance. They must earn between £12,571 and £50,270 (basic rate taxpayer) for the transfer to provide a benefit.
4. Select how many years to backdate - You can claim Marriage Allowance for up to 4 previous tax years in addition to the current year. Select the maximum (4 years back) to see the total potential savings from backdating.
5. Click "Calculate Tax Savings" - The calculator displays the amount of Personal Allowance being transferred, the annual tax saving, the total saving including backdated years, and a year-by-year breakdown showing each tax year's savings.
6. Apply on GOV.UK - If you are eligible, use the link provided to apply directly through the official GOV.UK website. The application takes approximately 10 minutes.

Everything You Need to Know About Marriage Allowance in the UK

What Is Marriage Allowance?

Marriage Allowance (officially called the Marriage Tax Allowance or sometimes referred to by its HMRC designation) was introduced by the UK government in April 2015. It allows a lower-earning spouse or civil partner to transfer 10% of their Personal Allowance (£1,260 in 2025/26) to their higher-earning partner. The higher earner then receives an increased tax-free allowance, reducing their Income Tax bill by up to £252 per year. Despite being available for over a decade, HMRC estimates that around 2.4 million eligible couples have still not claimed Marriage Allowance, missing out on hundreds of pounds each year.

Eligibility Requirements in Detail

To qualify for Marriage Allowance, the following conditions must all be met:

• Legal marriage or civil partnership: You must be legally married or in a registered civil partnership. Cohabiting couples (living together without being married) do not qualify, regardless of how long they have been together.
• Lower earner's income must be below the Personal Allowance: The transferring partner must earn less than £12,570 per year in 2025/26. This includes people who are not working, earn a small income from part-time work, have income solely from savings below the starting rate, or receive a pension below the Personal Allowance threshold.
• Higher earner must be a basic rate taxpayer: The receiving partner must earn between £12,571 and £50,270 per year (the basic rate tax band in England and Northern Ireland). In Scotland, the higher earner must be paying tax at the starter, basic, or intermediate rate (not the higher or top rate). If the higher earner is a higher rate (40%) or additional rate (45%) taxpayer, Marriage Allowance will not benefit them.
• Both born after 5 April 1935: If either partner was born before 6 April 1935, they may be eligible for the more generous Married Couple's Allowance instead, which is worth up to £1,037.50 per year. You cannot claim both Marriage Allowance and Married Couple's Allowance.

How the Tax Saving Is Calculated

The tax saving from Marriage Allowance works as follows for 2025/26:

• The lower earner's Personal Allowance is reduced from £12,570 to £11,310 (a reduction of £1,260). Since they earn less than £12,570, they are not paying any tax anyway, so this reduction does not cost them anything.
• The higher earner's Personal Allowance is increased from £12,570 to £13,830 (an increase of £1,260). This means an additional £1,260 of their income is now tax-free.
• Since the higher earner is a basic rate taxpayer paying 20% on income within the basic rate band, the tax saving is: £1,260 x 20% = £252 per year.

The tax saving is applied as a reduction to the higher earner's tax bill, not as an increase in the higher earner's Personal Allowance. This is a technical distinction that matters in certain edge cases - for example, if the higher earner's income is close to the basic rate threshold, the relief is still capped at £252.

Backdating Your Marriage Allowance Claim

One of the most valuable aspects of Marriage Allowance is the ability to backdate your claim. You can claim for up to 4 previous tax years in addition to the current year. As of the 2025/26 tax year, you can backdate to 2021/22. The potential total savings from backdating are:

• 2025/26 (current year): £252
• 2024/25: £252
• 2023/24: £252
• 2022/23: £252
• 2021/22: £252
• Total maximum backdated claim: £1,260

Backdated payments are made as a lump sum directly to the higher earner, usually via a cheque or BACS transfer from HMRC. You must have been eligible (married or in a civil partnership, with the correct income conditions) in each year you are claiming for. The current year's savings are applied through the higher earner's tax code, reducing their monthly tax deduction throughout the year.

How to Apply for Marriage Allowance

The application process is straightforward and can be completed in about 10 minutes online:

1. Go to GOV.UK: Visit gov.uk/apply-marriage-allowance to start the online application.
2. The lower earner applies: It is always the lower-earning partner who makes the application to transfer their allowance. You will need your own National Insurance number and your partner's National Insurance number.
3. Verify your identity: HMRC will ask you to verify your identity. You can do this using your Government Gateway ID, or by providing details from your passport, P60, or recent payslip.
4. Confirm details and submit: Review the information and confirm the transfer. HMRC will process your application and update both partners' tax codes.
5. Receive confirmation: You will receive an email or letter confirming the Marriage Allowance transfer. The higher earner's tax code will be updated, typically within 24 hours for the current tax year.

Marriage Allowance in Scotland

Marriage Allowance works slightly differently in Scotland because Scotland has its own income tax rates and bands. Scottish taxpayers can still claim Marriage Allowance, but the higher earner must be paying tax at the starter rate (19%), basic rate (20%), or intermediate rate (21%). If the higher earner pays the higher rate (42%) or top rate (47%) of Scottish income tax, Marriage Allowance does not apply. The tax saving may differ slightly from the English/Welsh figure of £252, depending on which Scottish tax band the higher earner falls into.

Common Scenarios Where Couples Miss Out

Many eligible couples are unaware they can claim Marriage Allowance. Common scenarios where couples qualify but have not claimed include:

• Stay-at-home parents: If one parent stays at home to look after children and has no income, they can transfer their unused Personal Allowance to their working partner.
• Retired couples: If one partner has a State Pension below £12,570 (most single-tier State Pensions are around £11,500) and the other has a pension income in the basic rate band, they can claim.
• Part-time workers: If one partner works part-time and earns less than £12,570, they may be eligible.
• Recently married couples: Many newlyweds are not aware of Marriage Allowance. If you got married in a previous tax year, remember you can backdate your claim.
• Civil partners: The allowance applies equally to civil partnerships, not just marriages.

When to Cancel Marriage Allowance

You should cancel your Marriage Allowance claim if your circumstances change. Situations where cancellation is appropriate include:

• Divorce or separation: Marriage Allowance continues until the end of the tax year in which you separate. You must then cancel the claim through GOV.UK.
• Income changes: If the lower earner starts earning more than £12,570, or if the higher earner moves into the higher rate tax band (above £50,270), the transfer no longer provides a benefit and should be cancelled.
• Death of a partner: If the lower earner dies, the Marriage Allowance transfer continues for the remainder of the tax year. The surviving partner should then cancel the claim.

To cancel, the lower earner (or their personal representative) should go to gov.uk/marriage-allowance and follow the cancellation process. Cancellations typically take effect from the start of the next tax year.

Marriage Allowance vs Married Couple's Allowance

It is important not to confuse Marriage Allowance with the Married Couple's Allowance. The Married Couple's Allowance is a separate, older tax relief that is only available to couples where at least one partner was born before 6 April 1935. It provides a larger tax reduction of between £401 and £1,037.50 per year, depending on income. You cannot claim both Marriage Allowance and Married Couple's Allowance - if you are eligible for the Married Couple's Allowance, that is usually the better option.

Marriage Allowance and Self-Assessment Tax Returns

If the higher earner completes a Self-Assessment tax return (for example, because they are self-employed or have additional income), the Marriage Allowance transfer is reflected in the tax return. The £1,260 reduction appears as a tax credit on the return, reducing the tax liability by up to £252. If the higher earner is employed and taxed through PAYE, HMRC will adjust their tax code to include the Marriage Allowance, so the benefit is spread throughout the year in their monthly or weekly pay.

The adjusted tax code typically starts with the letter M, indicating that the individual is receiving Marriage Allowance. The lower earner's tax code will include the letter N, showing they have transferred part of their Personal Allowance. If you notice these letters in your tax code, it confirms that Marriage Allowance is active.

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