| Date | What’s Due |
| 1 August | Corporation Tax for year to 31/10/2025, unless quarterly instalments apply |
| 7 August | Deadline for the 2026/27 first Quarterly Update, required for those already mandated into MTD for Income Tax |
| 19 August | PAYE & NIC deductions, and CIS return and tax, for month to 05/08/2026 (due 22 August if you pay electronically) |
| 1 September | Corporation Tax for year to 30/11/2025, unless quarterly instalments apply |
| 19 September | PAYE & NIC deductions, and CIS return and tax, for month to 05/09/2026 (due 22 September if you pay electronically) |
not all accountants are grey...
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