Martin Lewis has explained that married couples could be owed as much as £1,000 by HMRC.
The finance expert claimed that those who are married or in a civil partnership could be due a tax break of £250 per year.
And, this rebate can be backdated to 2017.
That's a hefty sum which could be splashed on a holiday (restrictions allowing) or saved for a rainy day.
This is because of the Marriage tax allowance which Martin says many people have never claimed when they're eligible to do so.
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And, if they haven’t they could claim back four years worth of money by filling in a simple form on the HMRC website.
Speaking on aThe Martin Lewis Money Show Live, the finance journalist advised: "If you are a married couple or in a civil partnership – not common law, just living together doesn't count – and one of you is a non-taxpayer, the other is a basic 20% rate taxpayer, then this person can give 10 per cent of their tax-free allowance to the other person.
"You apply online at GOV.uk and it's worth about £250 this year, but you can go back four years."
He continued: "The past years are done by cheque, this year is done by tax code change. It's very lucrative, there are over one million people who aren't claiming it."
The tax break means that if one person in the couple earns less than their personal allowance of £12,570 and the other pays basic tax (meaning they earn between £12,571 to £43,66) then you can transfer 10% of your personal allowance to your other half.
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This causes a reduction in tax for the higher earning partner.
To make a claim head over to the gov.uk website's Marriage Allowance section where you'll need to fill in a form for the tax cut.
Meanwhile, the Money Saving Expert warned Brits about a Universal Credit flaw which could cost you money.
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