You must lodge your tax return by 31st October each year if you lodge by yourself. However, in case you are our existing client or registered as our client before 31st Oct, the due date is usually extended to 15th May every year by our tax agent concession. Payment due is also extended.
You are still required to lodge your tax return after the due date. Your lodgement obligation remais forever. ATO can impose penalties for non-lodgement or late lodgement if you leave your tax return non-lodgement.