- 21 January 2017 (23rd January 2017 for online payment and filing):
P30 Monthly Return and payment for December 2017
- 19 January 2017 (23rd January 2017 for online payment and filing):
Corporation Tax Return CT 1 and final payment for companies with accounting periods ending 30 April 2016
- 21 January 2017 (23rd January 2017 for online payment and filing):
Preliminary Corporation Tax due (where liability is less than €200,000) for accounting periods ending 31 Febraury 2017
- 31 January 2017:
Form 46G for companies with accounting periods ending 30 April 2016