- 14 May 2016 (23rd May 2016 for online payment and filing):
P30 monthly return and payment for April 2016
- 19 May 2016 (23rd May 2016 for online payment and filing):
Bi-monthly VAT 3 Return and payment for the period March/April 2016
- 21 May 2016 (23rd May 2016 for online payment and filing):
Corporation Tax Return CT 1 and final payment for companies with accounting periods ending 31 August 2015
- 21 May 2016 (23rd May 2016 for online payment and filing):
Preliminary Corporation Tax due (where liability is less than €200,000) for accounting periods ending 30 June 2016
- 31 May 2016:
Form 46G for companies with accounting periods ending 31 August 2015