Overpaid Income Tax? How to Check and Find the Right Refund Route
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Check whether you have overpaid, understand payroll corrections and use the appropriate HMRC refund process.
If you have paid more Income Tax than you owe, you may be entitled to a refund. The route depends on whether the tax year is still running, whether you complete Self Assessment and why the overpayment arose.
A lower-than-expected bank payment does not establish an Income Tax overpayment. Pension deductions, student loans, unpaid leave or a different pay period can also explain it.
Start with the deduction and tax year
Compare the Income Tax line on your payslip with the code used and the year-to-date totals. Check HMRC's current-year income and tax details, including active jobs, estimated income and taxable benefits.
A code different from 1257L can be correct. A BR code on a second job may be right if your allowance is used elsewhere. W1 or M1 means current-period tax rather than cumulative treatment; it does not automatically prove that too much tax was taken.
See HMRC's tax-code guidance and our explanation of emergency tax.
An illustration, rather than a promised refund
Assume employment income of £30,000 across the whole 2026/27 tax year in England, Wales or Northern Ireland, with the full standard allowance and no other income, reliefs or adjustments. Annual Income Tax would be £3,486.
If the final records showed £4,000 of Income Tax actually paid and the liability remained £3,486, the difference would be £514. That is an arithmetic illustration, not evidence that every person earning £30,000 is owed that amount. NI, pensions and student loans are separate deductions and do not form part of this £514 calculation.
Check Income Tax rates and allowances against the year concerned.
During the current tax year
If the underlying HMRC record is wrong, update it. If payroll used incorrect pay details or failed to apply the relevant instruction, ask your employer to investigate.
A corrected cumulative code may refund excess tax through a later payslip. The amount and timing depend on your pay and tax record. A correction can also reveal an underpayment, so it should not be described as a guaranteed refund.
After the tax year ends
Some PAYE taxpayers receive a P800 calculation or Simple Assessment after HMRC checks the year's records. If you receive a calculation, read it and check the income and tax figures before following its payment or repayment instructions.
People completing Self Assessment normally handle the year's overpayment through their return and HMRC account. A refund may be affected by other amounts owed or checks on the claim.
Use GOV.UK's tax refund checker to find the route for your circumstances. The checker does not itself submit a refund claim. P50 is not a general-purpose form for all overpayments; it applies to particular stopped-work situations.
Deadlines and waiting times
For many Income Tax overpayment claims, the normal limit is four years after the end of the relevant tax year. See HMRC’s overpayment relief time limit. Different processes can have their own rules, including amendments to Self Assessment returns. Check the route and deadline rather than relying on a generic promise about all refunds.
For example, the usual four-year limit for a 2022/23 overpayment claim ends on 5 April 2027. Keep the payslips, P60, P45 and HMRC correspondence that support your claim.
Follow the current instructions in HMRC's overpayment guidance and its refund checker. Payment times vary, so do not budget on an unconfirmed refund arriving on a particular date.
Our salary calculator estimates deductions from employment pay. It does not decide refund entitlement or submit a claim to HMRC.