Checked 26 October 2026. This reminder concerns the standard 2025/26 Self Assessment timetable. It is relevant to people required to file, including some sole traders and partners; it is not a deadline for every pub or limited company.

Paper means received by HMRC

HMRC says it must receive the standard paper return by 23.59 on Saturday 31 October 2026. Posting it on that date is not the same as receipt. The standard online filing deadline is 23.59 on 31 January 2027.

Check your own notice

Different circumstances and HMRC notices can change a deadline. Check your account and ask your accountant if you are unsure which return, method or date applies. Company accounts and Corporation Tax have separate timetables.

Official deadlines: Read the source

Your next action

Confirm who is submitting the return and keep evidence of submission or receipt. Use the official guidance for current dates. This is general information, not personal tax advice.