CIS return
Construction Industry Scheme: monthly return due for period up to 5th of previous month.
Intrastat
Due date for payment of supplementary declarations for February 2018.
EC sales list
Deadline for online monthly or quarterly return filing.
Monthly electronic PAYE/class 1 NICs/student loan payment
If paying electronically, pay PAYE, class 1 NICs, student loan deductions and deductions from payments to subcontractors for the month up to the 5th of this month.
Corporation tax return
Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 March 2017 to be submitted to HMRC.