Tax filing deadlines: Oct to Dec 2025

Key dates including paper tax return deadline and self assessment registration for first timers

1 October

Corporation tax due for accounting periods ended 31 December 2024 where not payable by instalments

5 October

Deadline for registering for self assessment for 2024–25 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 2025

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