Self assessment – key dates

31 January 2025 – First payment on account due for 2024/25 tax year.

31 July 2025 – Second payment on account for 2024/25 tax year.

5 October 2025 – Deadline for notifying HMRC of new sources of income (including the Child Benefit charge) if no tax return has been issued for 2024/25 tax year.

31 October 2025 – Deadline for submission of 2024/25 non-electronic returns.

30 December 2025 – Deadline for submission of 2024/25 electronic tax returns if ‘coding out’ of eligible underpayment is required.

31 January 2026 – Deadline for filing electronic tax returns for 2024/25. Balancing payment due for 2024/25 tax year. First payment on account due for 2025/26 tax year.