How to Claim an Income Tax Refund From HMRC After Paying Too Much Tax

Start with the reason you paid too much tax

There is no single HMRC form for every personal Income Tax overpayment. HMRC's refund checker directs you to the appropriate procedure based on why the tax was overpaid. It covers overpayments from employment pay, job expenses, pensions, Self Assessment, redundancy payments, savings and annuity income, foreign income and certain UK income connected with living abroad or leaving the UK.

Using the right route matters because the documents, online service and repayment timing can differ substantially between cases.

If too much tax was deducted from your job

If your tax code is wrong and HMRC has enough income information for the tax year, HMRC can update your tax code and your employer may repay the difference through your wages. After your employer receives the new code, HMRC says it should normally be used on your next or following monthly pay, or your third weekly pay.

If the tax year has ended, HMRC checks information from employers, pension providers and benefits offices. If you are employed or receive a pension and the final calculation is wrong, HMRC may send a P800 tax calculation explaining whether you are owed a refund.

If your P800 says HMRC owes you a refund

Follow the instructions on the P800. If it says you can claim online, you will normally need the P800 reference number and your National Insurance number.

HMRC says a P800 refund claimed online is sent within 5 working days. If you ask HMRC to send a cheque, it can take up to 6 weeks. If the P800 says HMRC will automatically send a cheque, HMRC says it should arrive within 14 days of the date on the letter.

If you have stopped working during the tax year

You may be able to use form P50 to claim during the current tax year if you have stopped working and meet HMRC's conditions. Examples include being unemployed for at least 4 weeks without claiming taxable state benefits, retiring without receiving a pension from your previous employer, not expecting to return to work, or returning to full-time study.

You should have received your final pay before applying. P50 is not the correct route in several situations, including where you expect to start another job within 4 weeks, receive certain taxable benefits or occupational pension income, or need to reclaim tax on a pension flexibility payment. HMRC states that it may take 14 days to receive a reply after it receives a completed P50 claim.

If the overpayment came from a pension lump sum

The correct pension refund form depends on what happened to your pension pot. HMRC currently directs taxpayers to different forms including P55, P53, P53Z and P50Z.

• P55 can apply when you flexibly accessed part of a pension pot, did not empty it, do not expect further regular or flexible payments before the end of the tax year, and the pension provider cannot make the refund.
• P53Z can apply after flexibly accessing and emptying the pension pot or receiving certain serious ill-health lump sums.
• P50Z can apply where you stopped work and flexibly accessed and emptied the pension pot, subject to HMRC's conditions.
• P53 is used for certain small pension lump sums or trivial commutation payments.

Do not select a pension form only because tax was deducted at a high rate. Use HMRC's criteria for the exact type of pension payment you received.

If you paid job expenses yourself

You may qualify for tax relief if you used your own money for items you had to buy for your job and they were used for work, provided your employer did not reimburse the full cost. You must also have paid Income Tax in the year you are claiming for.

For postal employment-expense claims, HMRC requires form P87. A postal P87 claim must normally be within 4 years after the end of the relevant tax year, the total expenses claimed must be £2,500 or less for each tax year, and you must have paid tax for that year. Claims above £2,500 are made through Self Assessment.

For the tax year from 6 April 2026 to 5 April 2027, HMRC states that employees cannot claim tax relief for working from home, although eligible claims can still be made for the previous 4 tax years.

If you complete a Self Assessment tax return

If you are registered for Self Assessment, your overpayment is handled through your Self Assessment account rather than a P800. If you need help filing the return itself, see how to file your Self Assessment tax return online with HMRC.

HMRC may not pay a Self Assessment refund directly if you have tax becoming due within the next 45 days, such as a payment on account. In that case, the repayment may instead be set against what you owe.

If you overpaid tax after redundancy

Tax treatment depends on what the termination payment represents. The first combined £30,000 of qualifying statutory redundancy pay and certain additional severance payments is normally tax-free, while amounts such as normal wages, holiday pay and payments equivalent to notice can be taxable.

If PAYE was deducted at a rate that turns out to be higher than your actual Income Tax liability for the year, you may be entitled to a repayment. Use the HMRC refund checker to identify the correct route rather than assuming the entire tax deduction on a termination payment is refundable.

How far back can you claim?

HMRC's general rule for many Income Tax repayment and relief claims is 4 years from the end of the tax year concerned. Some types of claim have their own specific rules or deadlines, so follow the instructions for the route identified by HMRC.

What happens after you submit the claim?

HMRC checks whether a repayment is due and may ask for more information. The timescale is not the same for every type of refund. P800 online repayments have a specific published payment timeframe, while other Income Tax requests are handled according to their individual route. HMRC provides an online service showing current expected reply dates for Income Tax and Self Assessment requests.

Common mistakes to avoid

• Do not use an employer PAYE overpayment service to reclaim personal employee Income Tax; that service is for employers dealing with PAYE account overpayments.
• Do not assume the P50 route applies simply because you left a job; your new employment, benefits and pension circumstances affect eligibility.
• Do not use the wrong pension repayment form. P55, P53, P53Z and P50Z apply to different situations.
• If you complete Self Assessment, claim relevant repayments or relief through the tax return or Self Assessment account where HMRC requires this.
• Keep evidence supporting employment-expense claims and any income figures supplied to HMRC.
• You do not need a tax refund company to make a claim. HMRC warns that commercial refund companies may charge fees for making claims on your behalf.