| Date | What’s Due |
| 1/01 | Corporation tax payment for year to 31/3/20 (unless quarterly instalments apply) |
| 19/01 | PAYE & NIC deductions, and CIS return and tax, for month to 5/01/21 (due 22/01 if you pay electronically) |
| 31/01 | Deadline for Self-Assessment tax return for 2019/20 if filed online. Also the due date for 2019/20 balancing payment and 50% payment on account of 2020/21 tax.
Note that if this liability is no more than £30,000 you can agree with HMRC to spread over 12 months |
| 1/02 | Corporation tax payment for year to 30/4/20 (unless quarterly instalments apply) |
| 19/02 | PAYE & NIC deductions, and CIS return and tax, for month to 5/02/21 (due 22/02 if you pay electronically) |