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Marriage Allowance Calculator
Free Marriage Allowance calculator: check if you qualify to move £1,260 of Personal Allowance to your spouse or civil partner, how much you save each year and how much a backdated claim could be worth.
Your incomes this tax year
You save a year
£252
| Allowance moved to your partner | £1,260 |
| Backdated up to 4 earlier years (about) | £1,260 |
If you're married or in a civil partnership, the lower earner can move £1,260 of their Personal Allowance to a basic-rate partner, cutting the partner's tax by up to £252 a year. You can backdate a claim for up to 4 tax years. It's free to apply on GOV.UK; you don't need a company to do it.
Rules last checked October 2026. Backdated figure assumes similar incomes in earlier years. Not legal, tax or financial advice. 🔒 Everything stays on your device.
✅ Rules last checked:
📚 Official sources: GOV.UK: Marriage Allowance
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
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Questions people ask
How much does Marriage Allowance save?+
Up to £252 a year. You can also backdate it for up to 4 earlier tax years.
Who can get Marriage Allowance?+
Married couples and civil partners where one earns under the Personal Allowance (£12,570) and the other pays only basic-rate tax.
Do I need to pay someone to claim?+
No. Apply free on GOV.UK; it takes a few minutes.