1 June 2017 – Due date for Corporation Tax due for the year ended 31 August 2016.19 June 2017 – PAYE and NIC deductions due for month ended 5 June 2017. (If you pay your tax electronically the due date is 22 June 2017.)19 June 2017 – Filing deadline for the CIS300 monthly return for the month ended 5 June 2017.19 June 2017 – CIS tax deducted for the month ended 5 June 2017 is payable by today.1 July 2017 – Due date for Corporation Tax due for the year ended 30 September 2016.6 July 2017 – Complete and submit forms P11D return of benefits and expenses and P11D(b) return of Class 1A NICs.19 July 2017 – Pay Class 1A NICs (by the 22 July 2017 if paid electronically).19 July 2017 – PAYE and NIC deductions due for month ended 5 July 2017. (If you pay your tax electronically the due date is 22 July 2017.)19 July 2017 – Filing deadline for the CIS300 monthly return for the month ended 5 July 2017.19 July 2017 – CIS tax deducted for the month ended 5 July 2017 is payable by today.