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| Date | What’s Due |
| 01/10 | Corporation tax for year to 31/12/17, unless quarterly installments apply |
| 05/10 | Deadline for notifying HMRC of chargeability for 2017/18 if not within Self-Assessment and receive income or gains on which tax is due |
| 19/10 | PAYE & NIC deductions, and CIS return and tax, for month to 5/10/18 (due 22/10 if you pay electronically) |
| 01/11 | Corporation tax for year to 31/01/18, unless quarterly installments apply |
| 19/11 | PAYE & NIC deductions, and CIS return and tax, for month to 5/11/18 (due 22/11 if you pay electronically) |