PAYE & NIC deductions, and CIS return and tax, for month to 5/01/19 (due 22/01 if you pay electronically)
Deadline for Self-Assessment tax return for 2017/18 if filed online. Also the due date for 2017/18 balancing payment and 50% payment on account of 2018/19 tax.
Corporation tax payment for year to 30/4/18 (unless quarterly instalments apply)
PAYE & NIC deductions, and CIS return and tax, for month to 5/02/19 (due 22/02 if you pay electronically)