| Date | What’s Due |
| 1/12 | Corporation tax for year to 28/02/2017 unless quarterly instalments apply. |
| 19/12 | PAYE & NIC deductions, and CIS return and tax, for month to 5/12/17 (due 22/12 if you pay electronically). |
| 30/12 | Deadline for filing 2016/17 tax return online in order to request that HMRC collect outstanding tax via the 2017/18 PAYE code. |
| 1/01 | Corporation tax for year to 31/03/17. |
| 19/01 | PAYE & NIC deductions, and CIS return and tax, for month to 5/01/18 (due 22/01 if you pay electronically). |
| 31/01 | Self-Assessment tax return for 2016/17 due, together with balancing payment and 50% payment on account of 2017/18 tax. |
Diary of main tax events December / January 2018
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