| Date | What’s Due |
| 1 October | Corporation Tax for year to 31/12/2025, unless quarterly instalments apply |
| 19 October | PAYE & NIC deductions, and CIS return and tax, for month to 05/10/2026 (due 22 October if you pay electronically)
These are also the due dates for Class 1B NICs due under PAYE Settlement Agreements. |
| 28 October | Chancellor John Healey delivers Autumn Budget 2026 |
| 31 October | Paper Self Assessment tax returns for 2025/26. |
| 1 November | Corporation Tax for year to 31/01/2026, unless quarterly instalments apply |
| 7 November | Deadline for the second Quarterly Update required under MTD for Income Tax |
| 19 November | PAYE & NIC deductions, and CIS return and tax, for month to 05/11/2026 (due 22 November if you pay electronically) |
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