September 2026

1 September

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

HMRC review advisory fuel rates for company cars for Sep-Nov period

7 September

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

14 September

Corporation tax instalment payments due for large companies as follows:            

• Year ended 31 May 2026 – instalment 4
• Year ended 31 August 2026 – instalment 3
• Year ended 30 November 2026 – instalment 2
• Year ended 28 February 2027 – instalment 1          

Corporation tax instalment payments due for very large companies as follows: