Thousands of pounds could be sitting unclaimed in tax overpayments, with specialists revealing the typical refund amounts to £2,500 across the UK.
Research from rebate experts RIFT analysed the average total claims made to HM Revenue and Customs (HMRC) over a four-year period.
On its website, the firm stated: "By law, if you're travelling to temporary workplaces and paying to make your own way there, you could be owed a tax rebate.
"On average, a four-year tax rebate claimed through RIFT amounts to £2,500. Often, overpaid tax comes from things like not being reimbursed for the costs of travel or work-related expenses by your employer. Without making a claim HMRC won't know to send it to you. It's a clunky system but we're here to help."
Britons are being reminded to check if they are entitled to a tax rebate
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An incorrect code could mean you've been overpaying for years, analysts warn.
The most prevalent tax code across the UK is 1257L, which directly corresponds to the personal allowance threshold of £12,570.
This is the annual earnings limit before income tax applies with the 1275L code appearing on most payslips for individuals with a single employment or pension.
Workers are able to locate their tax code by checking their payslips, P60 forms and pension statements.
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HMRC online service and mobile app provide instant access to someone's current code, allowing the tax authority to verify its accuracy and understand any adjustments.
The numerical portion represents your tax-free allowance divided by ten, while the letter indicates your specific circumstances and entitlements.
The letter component reveals specific tax circumstances, with "L" confirming eligibility for the standard personal allowance.
Marriage Allowance transfers appear as "M" when receiving 10 per cent of a partner's allowance, or "N" when transferring yours.
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Emergency tax codes containing "W1" "M1", or "X" typically emerge during transitions like new employment, receiving workplace benefits, or starting state pension collection. These temporary codes require monitoring.
A "K" prefix signals a different taxation method entirely, often indicating you're repaying previous tax underpayments through current earnings. When using K codes, employers cannot deduct more than half your pre-tax wages or pension.
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Have you checked your tax code?
| GETTYTo rectify an incorrect tax code, contact HMRC directly on 0300 200 330 or through their online chat service.
The Government department will notify someone's employer to implement corrections, with any overpayments returned through your next wage payment.
HMRC provides an online form for claiming tax refunds if you suspect incorrect deductions. Crucially, they can reclaim overpayments from the previous four tax years if errors have persisted.
This tax code checker helps identify whether you're paying correct amounts and explains any discrepancies.