Filing a Self Assessment tax return is an annual chore for millions of UK taxpayers. Whether you’re self-employed, a company director, a landlord, or simply earn over £100,000, staying on top of the deadlines is vital.
Critical Deadlines
- 5 October: Deadline to register for Self Assessment.
- 31 January: Deadline for online tax returns and paying your tax bill.
Track all upcoming tax dates using our interactive Tax Calendar or search terms in our Tax Glossary.
Frequently Asked Questions (FAQ)
Q: Who needs to file a Self Assessment?
A: You must file if you are self-employed earning over £1,000, a company director, have untaxed rental or dividend income, or earn over £100,000.
Q: What is the deadline for filing online?
A: The deadline for submitting online returns and paying the tax bill is 31 January following the end of the tax year.
Q: What is the penalty for filing late?
A: An immediate £100 fine applies for filing 1 day late, which increases with daily penalties if the return remains unsubmitted after 3 months.