You open a letter from HMRC and see “P800” printed near the top, followed by a breakdown of your pay and the tax taken from it. That single page decides whether money is heading back to you or whether you have a bill to settle. Here is how a P800 tax refund works, how to collect it and how to make sure HMRC’s figures are right.
- P800 letters go to people taxed through PAYE, such as employees and pensioners. Those who file a Self Assessment return generally don’t receive one.
- Your letter tells you whether to claim the refund or wait for a cheque. Read that part first.
- Claiming online is usually the quickest route to the money.
- Tax you owe is normally recovered through your tax code during the next tax year.
- Compare every figure with your P60, P45 and P11D before you act.
What is a P800 tax refund?
A P800 tax refund is Income Tax you overpaid through PAYE, identified when HMRC reviews your record after the tax year closes. The P800 is the letter, which HMRC calls a tax calculation. The refund is the overpaid amount it shows.
Once the tax year finishes on 5 April, HMRC lines up the pay and pension figures reported by your employers and providers against the tax codes they used. Where the tax deducted and the tax due don’t agree, it writes to you with a P800 showing the gap.
Who receives a P800 tax calculation
GOV.UK says you’ll only get one if you’re employed or receive a pension. People who complete a Self Assessment return don’t usually receive one, because their tax is settled through the return.
When P800 letters arrive
HMRC posts P800 letters between June and March of the following tax year. For the 2025/26 year, which closed on 5 April 2026, that window runs from June 2026 to March 2027. A P800 tax refund can easily be missed if HMRC has an old address, so keep your details up to date.
Why the figures didn’t match
Most P800s trace back to a tax code that didn’t reflect your real income for part of the year. GOV.UK gives these typical reasons:
- HMRC held out-of-date income details, so your tax code was wrong;
- you switched jobs and were paid by the old and new employer in the same month;
- a workplace pension started paying you; or
- you received Employment and Support Allowance or Jobseeker’s Allowance.
Emergency codes after a change of job, and benefits in kind such as a company car that weren’t reflected in your code, are other regular causes.
Which P800 letter do you have?
Look for the part of the letter that explains what happens next. Each P800 points to one of four outcomes, and only two of them lead to a P800 tax refund.
| Your letter says | What it means | Your next move |
|---|---|---|
| You can claim your refund | You overpaid and need to request the money | Claim online, through your personal tax account or in the HMRC app |
| HMRC will send you a cheque | You overpaid and payment is on its way | Follow the timescale in the letter; chase HMRC if it passes |
| You owe tax, collected through your tax code | You underpaid, usually by less than £3,000 | Check the figures; pay early if you’d rather |
| You receive a Simple Assessment letter instead | You owe tax that can’t be taken through a code | Pay by the date that letter gives |
How to claim your P800 refund
If your letter asks you to claim, there are three free ways to do it. You never need to pay a third party to collect a P800 tax refund for you.
Online with your P800 reference and NI number
Go to HMRC’s online refund service. You’ll be asked for the reference number printed on your P800 and your National Insurance number. You don’t need Government Gateway details for this route, and you can choose a bank transfer or a cheque.
Through your personal tax account or the HMRC app
If you already use either one, you can request the money there and have it paid into a UK bank account. Our guide to signing in to your HMRC personal tax account covers the set-up.
By phone or cheque
If going online isn’t practical, contact HMRC and ask for your P800 tax refund to be sent by cheque. Confirm the address on your letter first, and expect a cheque to take longer than a bank transfer.
How the rules have changed
HMRC once posted a cheque automatically if you didn’t claim within a few weeks. From 31 May 2024 that stopped for most single-year refunds, as the Low Incomes Tax Reform Group explains. An unclaimed P800 tax refund stays on your tax record until you request it.
HMRC’s August 2026 Employer Bulletin extended the same approach to refunds covering more than one year. It says repayments are no longer issued automatically by cheque for the majority of employees who make a multi-year P800 tax refund request.
Once the claim is agreed, they request the repayment through the HMRC app, their personal tax account or the online service. Anyone who prefers a cheque, or can’t get online, can still ask for one, though it takes longer. The bulletin does not give a start date, so go by what your own letter says.
| Payment route | Usual timescale (not guaranteed) |
|---|---|
| Claimed online, paid by bank transfer | Usually within 5 working days of a successful claim |
| Cheque requested from HMRC | Up to around 6 weeks |
| Letter says a cheque will be sent automatically | The timescale stated in your letter |
Online refunds are usually paid within five working days after a successful claim, although HMRC checks or processing delays can affect the actual payment date. If your letter says a cheque will be sent automatically, follow the timescale stated in that letter.
Source: GOV.UK: If you’re due a refund, checked 29 October 2026.
How to check your P800 tax calculation
HMRC builds the calculation from what employers and pension providers report, and those reports aren’t always right. A short check against your own paperwork protects you. An error can leave your P800 tax refund too low, or too high and later reclaimed.
| Item on your P800 | Compare it with |
|---|---|
| Pay and tax for each job | Your P60, or the P45 from any job you left |
| Company car, health cover or other benefits | Your P11D or your employer’s benefits summary |
| Savings interest | Year-end statements from your bank or building society |
| State or workplace pension | Your annual pension statement |
| Taxable benefits such as JSA or ESA | Your P60U or benefit award letters |
| Allowances and reliefs | Marriage Allowance, job expenses or pension relief you’ve claimed |
Not sure what each form shows? Our guide to the P60 and P45 sets out the difference.
If something looks wrong
GOV.UK advises contacting HMRC to say which amounts you think are incorrect and what they should be. Hold off claiming or paying until it’s resolved, and keep copies of the documents you’re relying on. If HMRC agrees, it issues a fresh calculation, which may change your P800 tax refund.
In 2025/26, Joel lives in England. He earns £15,000 from Job A between April and September on the 1257L code. He then joins Job B without handing in his P45, and Job B taxes another £15,000 at a flat 20%.
Tax deducted: Job A gave him half a year’s allowance, so (£15,000 − £6,285) × 20% = £1,743. Job B deducted £15,000 × 20% = £3,000. Total: £4,743.
Tax due for the year: (£30,000 − £12,570) × 20% = £3,486.
Overpayment: £4,743 − £3,486 = £1,257.
The figures use the 2025/26 Personal Allowance of £12,570 and the 20% basic rate in England, Wales and Northern Ireland, as shown in GOV.UK’s previous tax year rates. National Insurance is left out.
What if your P800 says you owe tax?
HMRC normally recovers an underpayment by adjusting your tax code. That happens when you pay tax through an employer or pension, earn enough to cover the extra deduction and owe less than £3,000.
The amount is usually spread in equal instalments over 12 months from the start of the next tax year, according to GOV.UK’s guidance on owing tax. To clear it in one go instead, you can pay your P800 directly before the next tax year begins on 6 April.
No P800 tax refund is due in this situation, but the same rule applies: check the figures first. Where the debt can’t be collected through your code, for example because it is over £3,000, HMRC sends a Simple Assessment letter with its own payment date.
P800 refund scams and refund agents
Fake refund messages are a common way fraudsters target taxpayers, so treat any unexpected contact with care.
Refund companies deserve the same caution. Some keep a share of your money as their fee, even though claiming a P800 tax refund yourself costs nothing and takes a few minutes.
Self Assessment and P800s
If you have rental income, self-employment income or taxable savings interest, check whether you need to complete a Self Assessment tax return. The requirement depends on your circumstances and the relevant HMRC rules. If you already file a return, your tax position is generally dealt with through that process rather than a P800 reconciliation.
Where a return is needed, any overpaid tax is normally handled as a Self Assessment repayment rather than a P800 tax refund. If you’re unsure whether you need to file, or your income now comes from several sources, our Self Assessment tax return service can help you work it out.
P800 tax refund FAQs
When will I get my P800?
HMRC sends P800 letters between June and March after the tax year ends. If you believe you’re owed a P800 tax refund and no letter has come, you can contact HMRC to claim.
How far back can I claim overpaid tax?
You generally have four years from the end of the tax year to claim. For 2022/23, the deadline is 5 April 2027.
I haven’t claimed my refund yet. Have I lost it?
No. An unclaimed refund stays on your HMRC record, but it won’t be paid until you claim, and the four-year limit still applies.
My cheque hasn’t arrived. What now?
Wait until the timescale in your letter has passed, then contact HMRC and confirm the address it holds for you.
Are very small refunds paid automatically?
Not always. Refunds below £10 are usually only paid if you ask, and you may not receive a P800 for them.
Is a P800 refund taxable?
No. It is your own overpaid tax being returned, so it doesn’t count as income.
Final Verdict: P800 Tax Refund in 2026/27
A P800 tax refund returns tax you overpaid through PAYE. Most refunds now need to be claimed, while some letters confirm a cheque is on its way, so start with what your own letter says. Check the figures against your P60, P45 and P11D, claim online if asked, and verify any unexpected message through your HMRC account. If you owe tax instead, it is usually collected through your tax code.
- Find your P800 and note which of the four outcomes it shows.
- Check each line against your P60, P45, P11D and savings statements.
- Claim if your letter asks you to, or call us on 0116 4030595 or email info@majoraccountancy.com if the numbers don’t add up.
Why trust this guide
- Written by Shahinur Chowdhury, a UK accountant at Major Accountancy.
- Claim routes, timescales and the multi-year change checked against GOV.UK and HMRC’s Employer Bulletin on 29 October 2026.
- Worked example uses HMRC’s published 2025/26 rates.
- General information only, not personal tax advice.
- GOV.UK: If you’ve not paid the right amount of tax
- GOV.UK: If you’re due a refund
- GOV.UK: If you owe tax
- GOV.UK: Pay if your tax calculation (P800) says you owe tax
- GOV.UK: Income Tax rates for previous tax years
- HMRC: Get an Income Tax refund (online service)
- GOV.UK: Report suspicious HMRC messages
- HMRC: Employer Bulletin, August 2026
- LITRG: Claiming back tax overpaid through PAYE
- LITRG: Tax refunds and time limits