How an HMRC tax refund actually reaches you
How an HMRC tax refund actually reaches you
Published 25 August 2026· Reviewed against gov.uk 25 August 2026· 4 min read·HMRC and compliance
Most tax refunds do not start with you asking. If you are employed or drawing a pension and the numbers came out wrong, HMRC’s own reconciliation catches it after the tax year ends and sends you a tax calculation letter, the P800, or in some cases a Simple Assessment letter. These go out between June and March of the following tax year, per GOV.UK. The letter says what happened, which years it covers, and how to get the money.
That timing matters. A genuine refund letter about the year that ended in April cannot reach you in May, and anything claiming to be one is worth treating with suspicion.
The refund system runs on letters and your online account. Anything that arrives faster than that with a link attached is not your money, it is after your money.
Why you end up overpaid in the first place
The common causes are mechanical. You were put on the wrong tax code, often because HMRC had stale information about your income. You finished one job and started another and were paid by both in the same month. You started a workplace pension. You received Employment and Support Allowance or Jobseeker’s Allowance part way through a year. Each one leaves PAYE deducting tax as if the year looked different from how it actually ended.
Checking your tax code is the fastest way to catch this early rather than a year later. It is on your payslip, in the HMRC app, and in your online account.
The routes for claiming, in order
If a P800 says you are owed money, the letter itself tells you how to claim, usually through your online account or the app, with a cheque as the fallback. If you think you have overpaid and no letter has come, the claim a tax refund tool covers overpaid tax on pay, job expenses, pensions, redundancy, savings interest and PPI, foreign income, and tax paid before leaving the UK.
If you file Self Assessment there is no P800 at all. Overpayments and underpayments adjust automatically through the return, and a refund comes back through your account details on the return. This catches people who file for capital gains or side income, they wait for a letter that is never coming.
For how long any of this takes, HMRC publishes a reply time checker, updated weekly. It is the honest answer to whether your claim is late or just normal.
The fake refunds that outnumber the real ones
Refund scams work because the message arrives when people are hoping for exactly that. The rule is simple. HMRC does not tell you about a refund by text, email or WhatsApp with a link to claim it. A real refund arrives as a letter, or appears in your online account and the app, and claiming it never involves typing card details into a linked page. Our guide to telling a real HMRC letter from a scam covers the tells in order of reliability, and the genuine letters currently in circulation are listed on HMRC’s own checker.
If a message about a rebate has a deadline measured in hours, it is a scam. Real refunds do not expire on Friday.
Refund questions
How do I know if HMRC owes me a refund?
If you are employed or on a pension, a P800 or Simple Assessment letter arrives between June and March after the tax year ends. You can also check your online account or use the claim a tax refund tool on GOV.UK.
How long does an HMRC refund take?
It varies by route and workload. HMRC publishes a reply time checker, updated weekly, which gives the current expectation for your kind of claim.
Does HMRC send refund texts?
No. HMRC does not announce refunds by text or email with a claim link. Those messages are scams, and the real letters in circulation are listed on GOV.UK.
I file Self Assessment, where is my P800?
There is not one. Self Assessment overpayments adjust through the return automatically and any refund is paid from that, not from a separate letter.
Sources
Every figure on this page was checked against the source below on 25 August 2026.
- Tax overpayments and underpayments. GOV.UK, checked 25 August 2026
- Check how to claim a tax refund. GOV.UK, checked 25 August 2026
- Check when you can expect a reply from HMRC. HM Revenue and Customs, checked 25 August 2026
- Tax codes. GOV.UK, checked 25 August 2026
- Check if a letter from HMRC is genuine. HM Revenue and Customs, checked 25 August 2026
Fahad Zar
Crypto tax accountant
- MSc Accounting and Finance, BPP University London
- 6+ years working in crypto and digital assets, across several specialist crypto tax firms
- Practises through Zar Enterprises Ltd, ICO registration ZC225094
What matters to me is that the number on the return is true, whatever it turns out to be.
Whether this is worth a conversation
Where this stops being a reading job and starts being a hiring one.
- A refund looks wrong or never arrived
- A refund message looks like a scam
- HMRC repaid you and you doubt it
If your P800 has arrived and the online claim works, take the money and skip the accountant, that route needs nobody's help.
If one of these is you, the first look costs nothing.
Read next
How to tell a real HMRC letter from a scam
The tells, in order of reliability, for the fake refunds that outnumber real ones.
Reviewed 25 August 2026ExplainerA letter from HMRC is rarely as bad as it looks
The rest of the envelope taxonomy, beyond the refund letters.
Reviewed 25 August 2026ExplainerWhat ETMP means on your HMRC account
The accounting system your refund actually moves through.
Reviewed 25 August 2026ExplainerHow to report capital gains on your Self Assessment
Why filers get refunds through the return rather than a P800.
Reviewed 25 August 2026
