21 March        
February 2018 monthly BAS due

31 March        
Tax return for companies and super funds with total income in excess of $2 million in the latest year lodged due

21 April          
Quarterly PAYG instalment activity statement due, quarter 3, 2017–18 for head companies of consolidated groups

March 2018 monthly BAS due

28 April
Make super guarantee contributions for quarter 3, 2017–18 to funds

21 May
April 2018 monthly BAS due

26 May
Quarterly BAS for quarter 3, 2017-18 due

28 May
Pay FBT annual return.