Tax filing deadlines: Oct – Mar 2027

5 Oct 2026

Deadline for registering for self assessment for 2025–26 to notify HMRC of chargeability to income tax and capital gains tax

1 October

Corporation tax due for accounting periods ended 31 December 2025 where not payable by instalments

5 October

Deadline for registering for self assessment for 2025–26 to notify HMRC of chargeability to income tax and / or capital gains tax

7 October

VAT returns and payments due for month or quarter ended 31 August 2026

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