If you have paid too much tax, HMRC will usually refund it — but not always automatically. Whether you receive a P800 letter, need to log in to your Personal Tax Account, or have to submit an R40 form depends on why the overpayment happened and which tax year the HMRC tax refund relates to.
This guide covers when HMRC issues an automatic tax refund, how the P800 refund process works, when you need to claim a tax refund yourself, how long each route takes, and what to do if your HMRC tax refund is delayed or lower than expected.
When you might be owed an HMRC tax refund
Overpaid tax happens more often than most people realise. Additionally, you may be due an HMRC tax refund or tax rebate if you:
- Changed jobs part-way through the tax year
- Were placed on an emergency tax code
- Held more than one job at the same time
- Did not use your full Personal Allowance for the year
- Stopped working part-way through the tax year
- Received a private pension after PAYE income
- Are self-employed and overpaid on account
- Left the UK part-way through the tax year
In many cases HMRC’s systems correct these situations automatically after the tax year ends. However, if they do not, you can claim a tax refund yourself.
P800 refund: what it is and how it works
A P800 is a tax calculation letter HMRC sends after the tax year to people whose PAYE tax needs correcting. If you overpaid, the letter confirms how much you are owed and how the P800 refund will be paid.
When P800 refund letters are sent
HMRC issues most P800 letters between April and November, with the peak volume in June and July. Consequently, if you have paid too much tax, you will usually hear from HMRC by the autumn following the end of the tax year on 5 April.
What a P800 refund letter says
The letter explains:
- The tax you paid and the tax you should have paid
- The tax refund amount owed to you
- How the P800 refund will be issued — either paid into your bank account online, or sent by cheque
Claiming a P800 refund online
If your P800 says you can claim online, do so through the GOV.UK service at Claim your Income Tax refund – GOV.UK https://www.gov.uk/claim-tax-refund. Additionally, you will need your Government Gateway sign-in and your P800 reference number.
Notably, online P800 claims are usually paid within around 5 working days once submitted.
If you do nothing after receiving a P800
Since 31 May 2024, HMRC no longer sends automatic cheques for P800 refunds where the letter directs you to claim online. Consequently, if your P800 says you can claim online and you take no action, the tax refund remains unclaimed on your tax record — you must actively claim it.
However, the exception is where your P800 letter explicitly says HMRC will send you a cheque. In that case no action is required and the cheque arrives by post. Otherwise, use the online service, the HMRC app, or your Personal Tax Account to claim your tax refund.
Additionally, if you request a cheque through the online service, it takes up to 6 weeks. If you claim by bank transfer, the money arrives within 5 working days.
If you have not received a P800 but think you are owed a tax refund
However, not every overpayment produces a P800 automatically. If you believe you are owed an HMRC tax refund but have not received a P800 letter, check your Personal Tax Account or contact HMRC directly. Common cases where P800 does not fire automatically include savings interest overpayments, expenses claims, and refunds for tax years more than four years old.
How to check if you are owed an HMRC tax refund
The fastest way to check is through your Personal Tax Account. Sign in at Personal tax account – GOV.UK https://www.gov.uk/personal-tax-account with your Government Gateway details.
Your Personal Tax Account shows:
- Your current tax code
- Your income for the current and previous tax years
- The tax you have paid
- Any tax refund due or tax owed
Additionally, if a tax refund is due, it will either be issued automatically or show as ready to claim. Furthermore, if HMRC needs additional information from you, this will also appear as a message in your account.
However, if you do not have a Government Gateway account, you can create one during the sign-in process. You will need your National Insurance number and either a P60, a valid UK passport, or details from a recent Self Assessment tax return to verify your identity.
When HMRC refunds you automatically
You do not always need to claim your tax refund. HMRC reviews PAYE tax records after each tax year and, where there is a clear overpayment, refunds it without you having to act.
How automatic tax refunds arrive
Automatic HMRC tax refunds arrive by:
- Direct payment into your bank account if HMRC has your bank details and you claim online through the P800 process
- Cheque, sent to your registered address, if your P800 letter explicitly says a cheque will be issued
However, you will not receive an automatic HMRC tax refund if the overpayment cannot be calculated from PAYE records alone — for example, if you need to claim tax relief on expenses or pension contributions that HMRC does not automatically see.
When you need to claim a tax refund yourself
Some tax refund situations require you to claim a tax refund rather than wait for HMRC to act. This includes:
- Tax refunds for previous tax years where no P800 was issued
- Refunds relating to work expenses, professional fees, or uniform costs
- Refunds relating to savings interest above your Personal Savings Allowance
- Refunds relating to pension contributions where higher-rate relief has not been applied
- Self-employed income where you have overpaid on account
- Situations where you left work mid-year and have not returned to PAYE
Additionally, you can claim a tax refund online through your Personal Tax Account, by phone to HMRC, or by post using the appropriate form.
How to claim an HMRC tax refund
There are three main ways to claim a tax refund, depending on your circumstances.
Claim your HMRC tax refund online
Online is the fastest option. Sign in at Claim your Income Tax refund – GOV.UK https://www.gov.uk/claim-tax-refund using your Government Gateway. Additionally, follow the questions relating to your situation — the service routes you through the correct form based on your answers.
Notably, most online tax refunds are paid within 5 working days of the claim being processed.
Claim your HMRC tax refund using form R40
The R40 is used to claim back tax deducted from savings and investment income if you are not registered for Self Assessment. Complete the R40 online at Claim a refund of Income Tax deducted from savings and investments – GOV.UK https://www.gov.uk/claim-tax-refund/if-you-havent-been-employed. Additionally, you can also request a paper copy to complete by post.
However, R40 postal refunds can take 6 weeks or more, particularly between April and July when demand is highest.
Claim your HMRC tax refund through Self Assessment
If you are self-employed or file a Self Assessment tax return, tax refunds are handled through the return itself. Consequently, any overpayment is either offset against your next tax bill or paid directly into your bank account when you submit the return.
However, you do not need to make a separate tax refund claim if you are within Self Assessment — the return is the claim.
What you may need to claim a tax refund
Depending on the type of claim:
- Your P45 or P60 for PAYE claims
- Payslips covering the period of the overpayment
- Details of savings or investment income for R40 claims
- Details of expenses or reliefs claimed
- Your Government Gateway User ID and password for online claims
How long an HMRC tax refund takes
Timing depends on the type of tax refund and how you claim.
| Refund route | Typical time |
|---|---|
| P800 online claim | Around 5 working days |
| Online claim via Personal Tax Account | 5 working days once processed |
| R40 postal claim | 6 to 8 weeks, longer April–July |
| Self Assessment refund | 2 to 4 weeks after submitting return |
However, processing times can extend during peak periods and if additional checks are needed. Notably, April to July is the busiest window for HMRC because the previous tax year is being reconciled.
Why your HMRC tax refund might be delayed
If your tax refund is late, there is usually a specific reason.
If your HMRC tax refund status is “pending”
A “pending” status in your Personal Tax Account usually means HMRC is running a verification check before releasing payment. Consequently, this is more common if your income has recently changed, if you have multiple income sources, or if HMRC needs to confirm your identity or bank details.
However, checks can take longer during peak tax refund periods after the end of the tax year.
Common reasons for HMRC tax refund delays
- Missing or incorrect bank details for direct payment
- Tax code changes affecting the calculation
- Claims covering multiple tax years
- Additional checks on your income or employment record
- Claim submitted during a peak period (April to July)
Why your tax refund might be lower than expected
Sometimes the amount refunded is smaller than you calculated. Common reasons include:
- Your tax code was updated mid-year and the refund reflects the adjusted position
- Reliefs or expenses claimed in a previous year are no longer included
- You have underpaid tax on another income source
- Higher-earner tapering of the Personal Allowance
Notably, if your income is between £100,000 and £125,140, your Personal Allowance is reduced by £1 for every £2 above £100,000, and is lost entirely at £125,140. Consequently, this can produce an effective marginal tax rate of 60% and reduce or eliminate any tax refund you were expecting.
What to do if your HMRC tax refund has not arrived
If you were expecting a tax refund but nothing has appeared:
- Check your Personal Tax Account for any status updates or messages from HMRC
- Confirm your bank details are current
- Look for any P800 letter you may have missed in the post
- Allow extra time between April and July when processing takes longer
However, if nothing changes after four weeks, contact HMRC. See How to contact HMRC – GOVexplained for current phone lines and online options.
HMRC tax refund scams: what to watch for
Genuine tax refund communications from HMRC follow specific patterns. HMRC will never:
- Send you a text message or email with a link to claim a tax refund
- Ask for your bank details or password by email or text
- Contact you through WhatsApp, Facebook, or Instagram about tax refunds
- Pressure you to claim urgently or your tax refund will “expire”
Notably, scam messages often mention “tax rebate” and include a link to what looks like a GOV.UK website. However, if you receive one, do not click the link. Report it to HMRC by forwarding the message to phishing@hmrc.gov.uk and delete it.
Consequently, always start your tax refund claim from the official GOV.UK service directly, not from links sent to you.
HMRC tax refund if you are self-employed
Self-employed tax refunds are handled entirely through Self Assessment. If your final tax bill for the year is less than you have already paid on account, HMRC will either offset the overpayment against your next tax bill or refund it directly to your nominated bank account.
Notably, you do not submit a separate tax refund claim. The overpayment is calculated automatically when you file your Self Assessment tax return. Additionally, HMRC usually pays the tax refund within 2 to 4 weeks of the return being processed.
However, if you want the tax refund paid rather than offset, make sure your bank details are up to date on your Self Assessment return.
HMRC tax refund if you have left the UK
If you leave the UK part-way through the tax year, you may be owed a tax refund because you have not used your full Personal Allowance for the year.
To claim a tax refund on this basis, complete form P85 at Get your Income Tax right if you’re leaving the UK – GOV.UK https://www.gov.uk/guidance/get-your-income-tax-right-if-youre-leaving-the-uk-p85. Additionally, you can submit the P85 online through your Government Gateway or by post.
The P85 tells HMRC that you have left the UK and asks them to review your tax position for the year. However, if a tax refund is due, HMRC will issue a reference number that you use through their online service to choose how to receive the refund — either a UK bank transfer or a cheque. From 2025/26 onwards, HMRC added the UK bank transfer option specifically for P85 refunds, which is faster than a cheque sent overseas.
Notably, you cannot claim a tax refund on this basis if you were self-employed — those refunds still go through Self Assessment.
Frequently asked questions
How do I know if I am owed a tax refund from HMRC?
Sign in to your Personal Tax Account at gov.uk/personal-tax-account. Additionally, it shows your income, tax paid, and whether a tax refund is due. HMRC may also send a P800 letter automatically after the tax year ends if you have overpaid.
Do I need to apply for a tax refund or is it automatic?
Many PAYE tax refunds are automatic — HMRC calculates and issues them through the P800 process. However, you only need to claim a tax refund yourself if the refund relates to a previous tax year, involves expenses or reliefs HMRC does not see automatically, or is for savings and investment income.
How long does an HMRC tax refund take?
Online P800 claims are usually paid within 5 working days. Additionally, R40 postal claims take 6 to 8 weeks. Self Assessment tax refunds take 2 to 4 weeks after the return is processed.
Why is my HMRC tax refund showing as pending?
A “pending” status usually means HMRC is running a verification check before releasing payment. Consequently, this is more common during peak periods, after income changes, or when identity or bank details need confirming. Notably, it does not usually indicate a problem with your claim.
Why is my tax refund lower than expected?
Common reasons include mid-year tax code updates, reliefs no longer included in the calculation, underpaid tax on other income being offset, or Personal Allowance tapering if your income is between £100,000 and £125,140.
What is a P800 refund?
A P800 is HMRC’s tax calculation letter sent after the tax year to people whose PAYE tax needs correcting. However, if it shows an overpayment, it becomes a P800 refund — claimed online or, where the letter says so, sent automatically as a cheque.
How do I claim a P800 refund online?
If your P800 letter says you can claim online, go to gov.uk/claim-tax-refund and sign in with your Government Gateway. Additionally, you will need your P800 reference number. Notably, the tax refund is usually paid within 5 working days.
What is form R40 used for?
The R40 is used to claim a tax refund of tax deducted from savings and investment income if you are not registered for Self Assessment. Additionally, you can complete it online or request a paper form. However, postal R40 tax refunds can take 6 weeks or more.
Can I claim a tax refund from a previous year?
Yes. You have 4 years from the end of a tax year to claim a tax refund for that year. For example, if you overpaid in 2022/23 (year ended 5 April 2023), you have until 5 April 2027 to claim. However, older tax years cannot normally be reclaimed.
How do I claim a tax rebate?
Tax rebate and tax refund mean the same thing. Consequently, use your Personal Tax Account for PAYE tax refunds, form R40 for savings and investment income, or Self Assessment if you are self-employed. However, watch for scam messages that use the word “tax rebate” to lure you to fake websites.
Can I claim a tax refund if I have left the UK?
Yes. Complete form P85 at gov.uk/guidance/get-your-income-tax-right-if-youre-leaving-the-uk-p85. Additionally, HMRC will review your tax position and send any tax refund due to your bank account.
Can I claim a tax refund if I am self-employed?
Yes, but through Self Assessment rather than a separate tax refund claim. Any overpayment is calculated when you file your return and is either offset against your next tax bill or paid to your bank account.
Next steps
- List of tax codes and what they mean – GOVexplained
- Income tax bands and thresholds – GOVexplained
- The full Self Assessment process – GOVexplained