yCalculator

Marriage Allowance Calculator

Last updated: April 2026

Couple Income

The spouse or partner with the lower income. They must usually earn below the personal allowance of £12,570.

£

The spouse or partner who pays income tax. Must be a basic rate taxpayer.

£

Backdating

You are eligible for Marriage Allowance

The lower earner can transfer unused personal allowance to the basic-rate taxpayer, reducing the couple's income tax bill.

Saving Summary

Annual saving£252.00
Backdated saving (4 years x £252)£1,008.00
Total saving£1,260.00

How It Works

Low earner transfers£1,260 of personal allowance
Higher earner getsExtra £1,260 tax-free
Tax saved per year£252.00

Tax Comparison

PersonBeforeAfterChange
Higher earner tax£4,486.00£4,234.00Saves £252.00
Low earner tax£0.00£0.00No change

Backdating note

You can backdate your claim by up to 4 tax years. At £252 per year, a full 4-year backdated claim is worth £1,008.

2021/22£252
2022/23£252
2023/24£252
2024/25£252

How To Claim

  1. Apply online at gov.uk/apply-marriage-allowance.
  2. The lower earner applies, not the higher earner.
  3. You need both National Insurance numbers.
  4. The first claim usually takes around 2 months to process.
  5. Future years are applied automatically through a tax code change.

What is Marriage Allowance?

Marriage Allowance allows one spouse or civil partner to transfer £1,260 of their personal allowance to the other. The recipient gets an extra £1,260 of income tax-free, saving £252 per year. It is available to married couples and civil partners where one person earns below the personal allowance and the other is a basic rate taxpayer.

Can I backdate the claim?

Yes. You can backdate your Marriage Allowance claim for up to 4 previous tax years, potentially receiving a lump sum payment of up to £1,008 in addition to the current year's saving. The claim is made online through HMRC and typically takes around 2 months to process.

Does it affect the lower earner?

The lower earner gives up £1,260 of personal allowance. If their income is below the personal allowance, which it usually is for this claim to be beneficial, this has no tax impact on them. If they later earn more, the arrangement can be cancelled.

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