An online form that takes 10 minutes to complete is all that's standing between one million UK couples and a potential tax break of up to £900.
HM Revenue and Customs say that those eligible couples could take advantage of the Marriage Allowance worth up to £238 per year, with potential backdated claims of £662.
Is the allowance difficult to claim as some have said however?
Those couples that have claimed the Marriage Allowance now total three million.
A tax free allowance of £11,850 delineates the amount of an individuals income on which no tax is paid. A non-taxpaying spouse or civil partner can transfer £1,190 of their tax free allowance to their taxpaying partner, lowering the amount of tax due.
This is only possible however, if the taxpaying spouse earns income of between £11,851 and £46,350, or £43,430 in Scotland.
The Marriage Allowance was introduced in April 2015, potentially benefiting approximately four million married couples.
Mel Stride of the Treasury comments that:
"This is a really important tax relief and reflects the social importance of marriages and civil partnerships.
I'd urge those that haven't yet managed to claim the money to do so right away - it's quick and easy to apply."
The lack of action by those eligible has become a source of frustration for HMRC.
Your financial adviser can help to make sure you are on track and help you to achieve your long term goals.
Information is based on our current understanding of taxation legislation and regulations which is subject to change.
One million married or civil partnered couples are missing out on a £900 tax break - and now it only takes 10 minutes to apply, says HMRC