P800 tax refund: how to check and claim your HMRC payment

A P800 tax refund letter explains whether HMRC owes you money after reviewing your UK Income Tax. To receive a refund, follow the payment instructions in that letter: some people need to claim, while others receive a cheque automatically. Check the calculation and use official services rather than unexpected refund messages.

• A P800 can show a refund or tax still owed; receiving one does not automatically mean a payout.
• The claim method depends on the instructions in your own letter.
• Online claims, requested cheques and automatic cheques have different payment times.
• This is a UK process, not a way to claim a Canadian tax refund.

Who receives a P800 tax refund letter?

HMRC checks whether the Income Tax collected matches what was due for the completed tax year. A P800 is a calculation of that difference, rather than a reward or a benefit application.

According to HMRC guidance checked on 16 October 2026, these calculation letters concern people who are employed or receive a pension. People registered for Self Assessment have their tax position adjusted through that system instead of receiving a P800 or Simple Assessment letter.

A mismatch can arise after changing jobs, particularly when the old employer and the new employer both pay you in the same month. An incorrect tax code, starting a workplace pension or receiving certain taxable benefits can also lead to a calculation.

Does everyone get a letter in summer?

No. HMRC says letters go out between June and March of the following tax year, so a summer headline does not establish a personal deadline or entitlement. A letter may also say that you owe tax rather than that HMRC owes you.

Readers in Canada should keep the jurisdictions separate: a P800 concerns UK Income Tax, not a CRA refund. Anyone with tax affairs in both countries needs to identify which authority issued the document before choosing a claim route.

How do you check the calculation before claiming?

Start with the tax year and the income entries in the letter. Compare those figures with your own pay, pension and tax records, keeping documents from different years separate.

HMRC’s previous-year checking service, reviewed on 16 October 2026, covers 6 April 2025 to 5 April 2026. It requires you to sign in, and you may be asked to verify your identity; the HMRC app offers another way to check the previous year’s Income Tax.

That particular service is not available if you paid any of that year’s Income Tax through Self Assessment. Checking the current tax year also uses a different service, so the period shown on screen matters.

If an entry looks wrong, HMRC asks you to explain which amount is incorrect and what it should be. Keeping the calculation alongside the supporting records makes the query more specific than simply saying the refund seems too small.

For help organising paperwork, our guide to preparing for tax filing with less stress provides broader planning ideas. The P800 instructions remain the relevant starting point for this UK refund.

How can you claim the money from HMRC?

Read the payment section before taking action. The central distinction is between a letter inviting an online claim and a letter confirming that a cheque will arrive without a claim.

1. Check whether the P800 says you can claim online or will receive an automatic cheque.
2. For the online claim service, have the letter’s reference number and your National Insurance number ready.
3. Choose an available payment option through the official service, rather than through a link in an unexpected message.
4. Keep a record of the request and the payment method selected.

HMRC’s guidance describes an online bank transfer service and an option to request a cheque online. It also lists the personal tax account or HMRC app as claim routes if you have a UK bank account, alongside contacting HMRC.

If the letter says a cheque will be sent automatically, there is no claim to submit for that payment. Someone unable to create a personal tax account can contact HMRC for advice rather than paying an intermediary simply because online access is difficult.

How long does a P800 refund take?

HMRC’s published timings, checked on 16 October 2026, depend on the route. These are different situations, so the shortest timeframe is not a promise for every refund.

Payment route	Published timeframe
Refund claimed online	Within 5 working days
Cheque requested from HMRC	Within 6 weeks
Automatic cheque confirmed by the letter	Within 14 days of the letter’s date

For automatic cheque refunds spanning several years, HMRC says the money is combined into a single cheque. Keep the letter so that you can identify the relevant date and route if the payment does not arrive as expected.

A refund is easier to plan around once it has actually arrived. Our guide to building an emergency fund explains a possible use for spare cash without assuming that a pending tax payment is already available.

How can you avoid a misleading refund claim?

HMRC’s fraud guidance warns against following links or opening attachments in unexpected messages. A text offering a refund in exchange for personal or financial information is a warning sign, and HMRC does not offer tax rebates through social media.

Opening GOV.UK independently or using the HMRC app avoids relying on the message’s destination. An apparent sender name is not enough to establish authenticity, because fraudsters can imitate genuine contact details.

Refund companies are a separate issue: HMRC says they are not connected with the department and usually charge for their services. Comparing their terms with the direct claim options helps distinguish paid assistance from a requirement imposed by HMRC.

Informational content only, not financial advice.