1 March 2017 – Due date for Corporation Tax due for the year ended 31 May 2016.2 March 2017 – Self Assessment tax for 2015/16 paid after this date will incur a 5% surcharge.19 March 2017 – PAYE and NIC deductions due for month ended 5 March 2017. (If you pay your tax electronically the due date is 22 March 2017.)19 March 2017 – Filing deadline for the CIS300 monthly return for the month ended 5 March 2017.19 March 2017 – CIS tax deducted for the month ended 5 March 2017 is payable by today.1 April 2017 – Due date for Corporation Tax due for the year ended 30 June 2016.19 April 2017 – PAYE and NIC deductions due for month ended 5 April 2017. (If you pay your tax electronically the due date is 22 April 2017.)19 April 2017 – Filing deadline for the CIS300 monthly return for the month ended 5 April 2017.19 April 2017 – CIS tax deducted for the month ended 5 April 2017 is payable by today.