HMRC is advising individuals to stay alert for an important tax notification during the upcoming summer months. If you are employed under PAYE and have either overpaid or underpaid taxes for the 2025/26 fiscal year, you can anticipate receiving a P800 letter via mail.
Various factors could contribute to discrepancies in your tax bill, such as being on an incorrect tax code, recent job changes, or beginning to receive a pension. Each year following the tax year’s conclusion, HMRC reviews its PAYE records to ensure accurate Income Tax payments on earnings and pensions.
P800 letters will be dispatched in phases until March 2027, detailing the process for claiming a refund if you have paid surplus taxes. Refunds can typically be claimed online or through a mailed cheque. The common tax code, 1257L, applies to individuals with a single job or pension, but not everyone falls under this code. To ascertain your tax code, refer to your recent payslip or P45 if you have recently left a job.
In cases of underpaid taxes, individuals will owe HMRC money, necessitating prompt resolution to avoid accumulating a larger debt. Marc Gill, Director of Personal Tax Operations, emphasized the importance of ensuring prompt refunds for those who have overpaid taxes.
Should you receive a P800 letter, follow the instructions provided to claim your refund via GOV.UK or the HMRC app, a quick process that can be completed in just a few minutes.

