A warning has been issued to all couples who could be eligible for a tax break worth more than £1,000.
The marriage tax allowance allows a non-taxpaying spouse to shift 10% of their annual tax-free allowance to their basic-rate (20%) taxpaying partner.
This is worth £252 this year, and you can claim back up to four tax years, as long as you were eligible during that time.
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This means backdating can get you as much as £970.
But Money Saving Expert is warning those who want to apply for marriage tax allowance.
An alert on its website says people should "beware googling 'marriage tax allowance'".
It continues: "Some shyster firms will charge you for applying (they try to look official), but it's FREE to apply.
"Follow our guide and the correct links to do it safely at no cost."
You can find the links and information here
How does it work?
You need to be married or in a civil partnership to be eligible for the allowance. Unfortunately, just living together doesn't count.
One of you needs to be a non-taxpayer, earning less than the £12,570 personal allowance between 6 April 2021 and 5 April 2022.
The other partner needs to be a basic 20% rate taxpayer.
This means you'd normally need to earn less than £50,270. Higher or additional-rate taxpayers aren't eligible for this allowance.
You both must also have been born on or after 6 April 1935.
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