How many days until Self Assessment Deadline?
UK Self Assessment tax return deadline — 31 January.
About Self Assessment Deadline
When is Self Assessment Deadline this year?
Self Assessment Deadline 2027 falls on Sunday 31 January 2027 — that's Sunday.
31 January is the online Self Assessment deadline for the previous tax year in the UK. Late filing incurs a £100 penalty.
Upcoming dates
- 2027: 31 January (Sunday)
- 2028: 31 January (Monday)
- 2029: 31 January (Wednesday)
- 2030: 31 January (Thursday)
- 2031: 31 January (Friday)
UK Self Assessment deadlines
The 31 January deadline applies to filing your online Self Assessment tax return for the previous tax year and to paying any tax owed. Late filing triggers an automatic penalty, with further penalties and interest building up the longer it is left, so it is worth submitting early and not waiting until the last week. You will need your Unique Taxpayer Reference, income records, and details of any allowable expenses. Payments on account may also fall due on this date. This page is general information only; check GOV.UK or speak to an accountant for advice about your own situation.
Frequently asked questions
How many days until Self Assessment Deadline?
There are 115 days until Self Assessment Deadline 2027 (on Sunday 31 January 2027).
When is Self Assessment Deadline 2027?
Self Assessment Deadline 2027 is on Sunday 31 January 2027.
How many weeks until Self Assessment Deadline?
There are approximately 16.4 weeks until Self Assessment Deadline 2027.