31 January 2026 - First payment on account due for 2025/26 tax year.
31 July 2026 - Second payment on account for 2025/26 tax year.
5 October 2026 - Deadline for notifying HMRC of new sources of income (including the Child Benefit charge) if no tax return has been issued for 2025/26 tax year.
31 October 2026 - Deadline for submission of 2025/26 non-electronic returns.
30 December 2026 - Deadline for submission of 2025/26 electronic tax returns if 'coding out' of eligible underpayment is required.
31 January 2027 - Deadline for filing electronic tax returns for 2025/26. Balancing payment due for 2025/26 tax year. First payment on account due for 2026/27 tax year.
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.