Self Assessment tax return deadline
Online Self Assessment tax returns are normally due by 31 January after the tax year ends.
Countdown
204
days to go
Next date
Sunday, 31 January 2027
2025/26 online tax return deadline
Get a reminder 7 days before Self Assessment tax return deadline
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Upcoming dates
| Event | Date | Countdown | Region / notes |
|---|---|---|---|
| 2025/26 online tax return deadline | Sunday, 31 January 2027 | In 7 months | UK |
| 2026/27 online tax return deadline | Monday, 31 January 2028 | In 1 year 7 months | UK |
| 2027/28 online tax return deadline | Wednesday, 31 January 2029 | In 2 years 7 months | UK |
| 2028/29 online tax return deadline | Thursday, 31 January 2030 | In 3 years 7 months | UK |
Most online Self Assessment tax returns are due by 31 January after the relevant UK tax year ends. Missing the deadline can trigger penalties and interest, even if there is no tax to pay. Paper returns usually have an earlier 31 October deadline, and HMRC can set different dates in unusual cases. Keep records, pension contributions, gift aid claims and trading figures organised well before January.
health
Organise records before the HMRC deadline
Verified 13 May 2026
Questions
When is the 2025/26 tax return deadline?
For online Self Assessment, 31 January 2027.
What happens if I miss the deadline?
HMRC can charge penalties and interest.
Are paper tax returns due on the same date?
No. Paper returns are usually due by 31 October after the tax year ends.