March

1            Deadline for payment of any outstanding income and capital gains tax in respect of personal tax returns for 2018/19 to avoid 5% surcharge (last date to avoid surcharge is 30 days after 31 Jan)

14          Corporation tax fourth quarterly instalment payment for very large companies with annual taxable profits exceeding £20m (reduced if company is a member of one or more 51% groups) with an accounting period beginning on 1 Apr 2019

19          Deadline for filing online Construction industry scheme return for month ended 5 Mar