Married couple as well as those who are in a civil partnership are being urged to check if they are entitled to tax relief from HM Revenue and Customs (HMRC).
The relief could be worth up to £252 per year, with HMRC taking to social media to remind people to claim the financial support where possible.
Marriage allowance allows people to share their Personal Tax Allowance when one partner earns less than the threshold - £12,750 - and the other is a basic rate taxpayer - someone who pays 20 per cent tax on income above the personal allowance amount. And the support could be worth over a £1,000 for some couples, with those who have been married for years still able to qualify.