- 14 August 2018 (23rd August 2018 for online payment and filing):
P30 Monthly Return and payment for July 2018
- 21 August 2018 (23rd August 2018 for online payment and filing):
Corporation Tax Return CT 1 and final payment for companies with accounting periods ending 30 November 2017
- 21 August 2018 (23rd August 2018 for online payment and filing):
Preliminary Corporation Tax due (where liability is less than €200,000) for accounting periods ending 30 September 2018
- 21 August 2018:
Form 46G for companies with accounting periods ending 30 November 2017