Tax diary: October and November 2026
1 October 2026 - Corporation Tax payment is due for companies with an accounting period ending 31 December 2025, unless the company is required to make quarterly instalment payments. 5 October 2026 - Deadline for notifying HMRC of a new liability to Income Tax or Capital Gains Tax for the 2025-26 tax year. This may include registering for Self Assessment if you became self-employed, started receiving taxable rental income or received other income or gains that have not already been taxed. 7 October 2026 - VAT returns and payments are normally...