Corporation tax payment
Corporation tax payment due for year end 31 March 2017, for those companies not liable to pay their liability by instalments.
Research & Development Expenditure Credit (RDEC)
For larger companies, the RDEC increases to 12% for all qualifying research.
CT61 payment
Due date for income tax for the CT61 quarter to 31 December 2017.
CIS return
Construction Industry Scheme: monthly return due for period up to 5th of previous month.