Date / What’s Due
Corporation tax for year to 28/02/2018 unless quarterly instalments apply
PAYE & NIC deductions, and CIS return and tax, for month to 5/12/18 (due 22/12 if you pay electronically)
Deadline for filing 2017/18 tax return online in order to request that HMRC collect outstanding tax via the 2019/20 PAYE code
Corporation tax for year to 31/03/2018 unless quarterly instalments apply
PAYE & NIC deductions, and CIS return and tax, for month to 5/1/19 (due 22/12 if you pay electronically)
Deadline for filing 2017/18 self-assessment tax return online and paying your outstanding tax for 2017/18.