Key HMRC dates
Every Self Assessment deadline, what’s due on each, and what happens if you miss one.
Days left to the next three deadlines.
HMRC’s Self Assessment deadlines
Close to one? Call 01282 459490
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2
Paper tax returns
31 October 2026, days to go
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94
Online tax returns and payment
31 January 2027, days to go
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275
Second payment on account
31 July 2027, days to go
The Self Assessment year
For your 2025 to 2026 tax return. From gov.uk.
- 6 April 2026 You can send your 2025 to 2026 return from this date
- 31 July 2026 Second payment on account, if you pay towards your bill in advance
- 5 October 2026 Tell HMRC you need to file, if you haven’t filed before
- 31 October 2026 Paper tax returns must arrive by 11:59pm
- 30 December 2026 File online by 11:59pm to pay through your tax code
- 31 January 2027 Online tax returns and the tax you owe, by 11:59pm
If you miss a deadline
Late filing and late payment penalties, from gov.uk.
| Return sent | Penalty |
|---|---|
| A day late | £100 |
| 3 months late | £10 a day, up to £900 |
| 6 months late | 5% of the tax due or £300, whichever is more |
| 12 months late | Another 5% or £300, whichever is more |
Paying late adds 5% of the unpaid tax at 30 days, 6 months and 12 months, and interest on top.
Need help with your accounts?
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