Self Assessment deadlines
These are the deadlines for the 2025 to 2026 tax year. They apply to income, gains and cryptoasset disposals.
| Deadline | What you must do |
|---|---|
| 5 October 2026 | Tell HMRC you need to send a tax return, if you have not sent one before |
| 31 October 2026 | Send a paper tax return |
| 31 January 2027 | Send your online tax return and pay what you owe |
WarningYou’ll get a penalty if you miss these deadlines.
If you miss a deadline
You may have to pay interest and penalties. The longer you leave it, the more you pay.
Cryptoassets
Disposals of cryptoassets are reported on the same return and by the same deadlines. Find out about cryptoassets and Self Assessment.
If you have already missed a deadline
Send your return as soon as you can. Penalties are lower the sooner you file. If you have a reasonable excuse you can appeal.