MONTHLY LODGEMENT OBLIGATIONS:
Activity Statement: 21st Of Following Month
December Activity Statement: 21st of January
QUARTERLY LODGEMENT OBLIGATIONS:
Quarter 1: 25th November 2018
Quarter 2: 28th February 2019
Quarter 3: 26th May 2019
Quater 4: 25th August 2019
https://www.ato.gov.au/tax-professionals/prepare-and-lodge/bas-agent-lodgment-program/