1 December 2015 –
Due date for Corporation Tax due for the year ended 28 February 2015.

19 December 2015 –
PAYE and NIC deductions due for month ended 5 December 2015. (If you pay your tax electronically the due date is 22 December 2015.)

19 December 2015 –
Filing deadline for the CIS300 monthly return for the month ended 5 December 2015.

19 December 2015 –
CIS tax deducted for the month ended 5 December 2015 is payable by today.

30 December 2015 –
Deadline for filing 2014-15 Self Assessment online to include a claim for under payments (under £3,000) be collected via tax code in 2016-17.

1 January 2016 –
Due date for Corporation Tax due for the year ended 31 March 2015.

19 January 2016 –
PAYE and NIC deductions due for month ended 5 January 2016. (If you pay your tax electronically the due date is 22 January 2016.)

19 January 2016 –
Filing deadline for the CIS300 monthly return for the month ended 5 January 2016.

19 January 2016 –
CIS tax deducted for the month ended 5 January 2016 is payable by today.

31 January 2016 –
Last day to file 2014-15 Self Assessment tax returns online.

31 January 2016 –
Balance of Self Assessment tax owing for 2014-15 due to be settled today. Also first payment on account for 2015-16 due today.

Source: HM Revenue & Customs