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The Married Couple’s Allowance is a UK government tax relief for couples where one of the spouses or civil partners is born before 6 April 1935.
This allowance can reduce your (or your partner’s) tax bill by between £345 and £891.50 a year. Use this calculator from HMRC to work out how much you’re eligible to get.
To claim, simply complete the Married Couple’s Allowance section of the Self Assessment tax return.
If you’re both born after 6 April 1935, you are eligible for the Marriage Allowance instead.