Deadlines for Self-employed’s Income tax (for the year from 6 April 2024 to 5 April 2025) for self-employed business in United Kingdom and Northern Ireland is as follows:
- Paper returns by 31st October 2025,
- Online returns by 31st January 2026.
Late returns are charged a £100 penalty. If return is more than 3 months late, you’ll be charged daily penalties of £10 a day.