| Date | What’s Due |
| 01/01/19 | Corporation tax for year to 31/3/18, unless quarterly installments apply |
| 19/11/18 | PAYE & NIC deductions, and CIS return and tax, for month to 5/11/18 (due 22/11 if you pay electronically) |
| 01/02/18 | Corporation tax for year to 30/04/18, unless quarterly installments apply |
| 19/12/18 | PAYE & NIC deductions, and CIS return and tax, for month to 5/12/18 (due 22/12 if you pay electronically) |
| 30/12/18 | Deadline for filing 2017/18 tax return online in order to request that HMRC collect outstanding tax via the 2018/19 PAYE code |