Millions of service industry employees, ranging from nurses to hairdressers and construction workers, may be eligible for the cash back.
Many of those cover the cost of work-related expenses like car mileage, uniforms and tools themselves.
But if your wages come in via PAYE, you could be able to reclaim some of that cost.
And if you claim online now it could be in your account before December 25.
Have a say on new tax charges(Image: Handout)
Workers are urged to go directly to gov.uk to check if they can claim extra cash back.
And, rather than use an agency, in a few clicks they could be on their way to claiming their full tax relief entitlement for genuine work-related expenses.
If eligible, customers can log in to their Personal Tax Account to claim for their tax relief online and, if their claim is approved, be paid within three weeks.
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Financial Secretary to the Treasury, Mel Stride MP, said: “We know what a difference tax relief can make to hard-working customers, especially at this time of year.
“HMRC is keen to make sure customers get all the relief they’re entitled to, by using the online service.
“Tax relief isn’t available for all employment expenses, so the online Check If You Can Claim tool is very helpful – then if your claim is approved, your full tax relief will be paid directly into your bank account.
“The majority of claims are for repairing or replacing tools and branded uniforms, professional subscriptions and mileage. Healthcare workers, people working in food and retail, and those in the construction industry are among the top professions to claim from HMRC.