Martin Lewis is urging the millions of people in the UK who receive a regular payslip to check it straight away as they could have lost out on thousands.
The Money Saving Expert founder was live in Liverpool on Tuesday for an end-of-series special of his Money Show Live on ITV. The finance guru said people should check their wage slips as soon as possible before an April deadline as they could lose out on thousands of pounds if they don't.
He told his audience, and ITV viewers, that if the deadline is missed and it turns out your tax code was wrong, you won't be able to reclaim the money and some people could lose thousands of pounds that they're owed. Yorkshire Live reports he also told people exactly how to check their tax codes.
READ MORE: New IKEA opening in Greater Manchester today - where and when it opens
Mr Lewis said: "Urgently check if yours is correct. Your tax code is a number that tells your employer or your pension provider what tax to deduct from your income.
"1257L is a common one. The way to work this out is to add a zero to the end, so that becomes £12,570 which is your tax-free allowance. As for the L, that's complicated. I think from memory, that means 'lower'."
He added: "You need to check yours. Millions are wrong and it is YOUR responsibility. It is not HMRC's responsibility, it is not your employer's responsibility.
"If it's wrong and you underpaid, they'll come and they'll want the money and that is a nightmare for people. But if it's wrong and you overpaid then you're due the money back, but the deadline for the 2018-19 year is coming fast.
"This could be big money."
The deadline for the 2018-19 year is April so you don't have long to claim the money if you're owed. Martin also advised that anyone who wears a uniform for work, even just a branded t-shirt, could be eligible to claim a rebate of £60 a year on their taxes, but you only have days left to check before the 2018-19 year deadline passes.
For more of today's top stories click here.
READ NEXT:
GMP to recruit 264 more neighbourhood officers but will lose 300 PCSO roles
Greater Manchester Foodhall announces closure after 'unprecedented' rise in costs
'I thought it was an earthquake': Neighbour on moment building COLLAPSED as he watched TV
Cannabis farm discovered after major road cordoned off in Chorlton during fire
