P800 Tax Refund Explained UK
Understand your HMRC P800 tax calculation, decode the figures, and get step-by-step instructions on how to claim your refund or resolve any discrepancies.
Plan Your P800 Next Steps
Select what your P800 calculation says and how you want to proceed. The planner will generate a personalised, step-by-step guide to ensure you claim what you are owed or resolve any issues correctly.
P800 Action Planner
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P800 Quick Facts
Essential insights into HMRC tax calculations
Understanding the P800 Process
HMRC generates thousands of P800 calculations after the tax year ends. Here is how the system works and what happens behind the scenes.
HMRC Reviews Your Records
After 5 April, HMRC compares the tax you paid via PAYE against your total taxable income, including benefits, state pension, and multiple jobs.
The P800 is Generated
If there is a mismatch, HMRC generates a P800 calculation. This is sent by post or made available in your Personal Tax Account, usually between June and November.
You Check the Figures
It is your responsibility to verify that the income and tax paid figures match your P60 or final payslip. This is the time to catch any HMRC errors.
Refund Issued or Debt Collected
If you claim online within 45 days, refunds are paid within 5 working days. If you owe tax, HMRC will outline the repayment terms or tax code adjustment.
P800 Terms & Key Figures
A handy cheat sheet for understanding the specific terminology and sections used on a P800 tax calculation.
| P800 Term / Section | What It Means | What to Check |
|---|---|---|
| Tax Year | The period the calculation covers (e.g., 6 April 2022 to 5 April 2023). | Ensure it matches the year you are enquiring about. |
| Total Income | Your combined earnings from all jobs, pensions, and taxable benefits. | Compare this against your P60(s) to ensure no income is missing or duplicated. |
| Tax-Free Amount | Your Personal Allowance (usually £12,570) plus any blind person’s allowance. | Check that you have been given the full allowance you are entitled to. |
| Tax Due | The total amount of income tax you should have paid on your taxable income. | Verify this against the “Tax Paid” figure to see the final balance. |
| Tax Paid | The total tax already deducted from your pay or pension via PAYE. | This should match the “Total tax deducted” box on your P60. |
| Simple Assessment | A newer, simpler version of the P800 that acts as a direct tax bill. | If you receive this, you must pay by 31 January following the tax year, or set up a payment plan. |
P800 Tax Refund FAQ
Answers to the most frequently asked questions about HMRC P800 calculations, deadlines, and claiming procedures in the UK.
A P800 is a tax calculation sent by HMRC if you have paid too much or too little tax in the previous tax year. It details your income, tax code, and the exact amount you owe or are owed.
You have 45 days from the date on your P800 to claim your refund online via your HMRC Personal Tax Account. If you miss this deadline, HMRC will usually send you a cheque, or you have up to 4 years from the end of the relevant tax year to make a formal claim.
If you believe the information on your P800 is incorrect (e.g., missing income or wrong tax code), you should contact HMRC immediately via your Personal Tax Account or by phone. Do not ignore it, as incorrect data can lead to an incorrect tax code for the current year.
If you are owed a refund, it will not negatively affect your current tax code. However, if you owe tax, HMRC may adjust your current year’s tax code to collect the debt gradually through your PAYE earnings, provided the amount is under £3,000.