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UK households are having £1,258 added onto their Personal Tax-Free Allowance. Marriage Tax Allowance for the 2025/26 tax year is worth up to £252. If you're eligible and apply successfully, you'll also automatically get the tax break each year going forward.

In addition to the current year's allowance, you can backdate your claim by up to four tax years too, provided you were eligible – currently 2021/22, 2022/23 and 2023/24, 2024/25.

The amounts for each year are worth up to: 2025/26 - £252, 2024/25 - £252, 2023/24 - £252, 2022/23 – £252 and 2021/22 – £252. It means that if you claim for this tax year and backdate the maximum four years, you'll get up to £1,258.

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The Low Income Tax Refo

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