Key Tax Deadlines - October & November 2026
28 Sept, 20261 minuteA number of important tax deadlines fall due in October and November. Make sure you’re aware...
A number of important tax deadlines fall due in October and November. Make sure you’re aware of any deadlines that apply to you to help avoid penalties and interest charges.
See our key dates for your diary below and check which deadlines may apply to you:
Date | Deadline |
1 October | Corporation Tax for the year to 31/12/2025 (unless quarterly instalments apply) |
5 October | Deadline for notifying HMRC of chargeability, if not already within Self-Assessment, for 2025/26 |
19 October | PAYE & NIC deductions and CIS return and tax, for the month to 05/10/2026 (due 22/10/2026 if you pay electronically) |
28 October | Chancellor John Healey delivers Autumn Budget 2026 |
1 November | Corporation Tax for the year to 31/01/2026 (unless quarterly instalments apply) |
19 November | PAYE & NIC deductions and CIS return and tax, for the month to 05/11/2026 (due 22/11/2026 if you pay electronically) |
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