What do to if you receive a Form P800 tax calculation from HMRC
The calculation shows your total income and the allowances that are due to you for each of these years.
Not everyone will get a calculation - only those who have paid too much or too little tax - so do not worry if you do not receive one.
If you receive a calculation, it is important you check it to make sure you agree with the information included. If you agree with the calculation you do not need to do anything, but keep it safe.
Please make sure you read the notes that came with the calculation as these will help you understand what it means. You can read the notes online, see 'Related links'.
HMRC will not be issuing copies of forms P800 to agents so, if you are represented by an agent, please show the calculation to them.
HMRC will automatically send you a repayment, usually within a week.
If the underpayment is under £3,000, HMRC will automatically include the amount you have underpaid in your tax code. This spreads the collection of the underpayment throughout the year.
If the underpayment is under £3,000, but the coding deduction causes hardship, you can ask for the underpayment to be included in your tax code over a longer period.
If the underpayment is £3,000 or more, HMRC will write to you and ask for direct payment. You should contact HMRC on 0300 200 3300 if you wish to discuss a repayment schedule.
There are specific, limited circumstances in which HMRC can agree to forgo collection of an underpayment where information they held was not used at the right time.
If you think this applies to you, contact HMRC on 0300 200 3300.
For more information, please visit the 'Related links' section on this page.
If you do not agree with something included in the calculation, you can contact HMRC on 0300 200 3300, or write to HMRC at the address shown on the calculation.