Tax filing deadlines: Feb – Aug 2026

Key dates for deferment of payment of Class 1 NICs and MTD for Income Tax starts

1 February

Corporation tax due for accounting periods ended 30 April 2025 where not payable by instalments

Interest begins to accrue on any unpaid self-assessment tax liability due for 2024–25

2 February

P46 (car) forms due for the quarter ended 5 January 2026 (where benefits not payrolled)

5 February

Employment intermediary reports due for quarter ended 5 January 2026

Deadline for amending employment intermediary reports for quarter ended 5 October 2025

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