Over 2.1 million couples currently benefit from the Allowance, HMRC said. Married couples could save up to £252 a year, it added.
Eligible couples are those who are married or in a registered civil partnership; one spouse or partner does not pay income tax, or their income is below the Personal Allowance of £12,570; and the other spouse or partner pays income tax at the basic rate.
It is possible to backdate claims to include any tax year up to 6 April 2018, which could be worth up to £1,242 in tax relief.
Angela MacDonald, Deputy Chief Executive at HMRC, said:
‘We want every eligible couple to benefit from marriage allowance tax relief. Couples whose circumstances have changed – perhaps one of them has stopped working or taken a lower paid job – may not realise they are entitled to claim.
‘It’s easy to find out what you may be due – search ‘Marriage Allowance calculator’ on GOV.UK to get started. By applying on GOV.UK rather than through a third party, you get to keep 100% of the tax relief due.’
More information here: GOV.UK