Tax filing deadlines: Mar – Aug 2026

Key dates for amending corporation tax returns for accounting periods ended 31 March 2024 and MTD registration

1 March

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

HMRC review advisory fuel rates for company cars

7 March

(deadline falls on a weekend: plan accordingly)

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

14 March

(deadline falls on a weekend: plan accordingly)

Corporation tax instalment payments due for large companies as follows:

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