You have until 31 October each year to lodge your tax or you have a later due date when a registered tax agent prepares your tax return.
Failure to lodge on time penalty
The ATO may apply a penalty for failure to lodge on time if your tax return is not lodged by the due date.
Generally, the ATO apply a penalty for every 28 days (or part thereof) that your tax return is overdue, to a maximum of $850. The ATO may apply the penalty even where there is no tax payable.
If you use a tax agent to prepare and lodge your business activity statements (BAS) or your business tax returns they usually have an extension of time to meet the lodgement obligations.
As your agent the accountant needs to have all the necessary information to be able to accurately assess your situation and meet the necessary lodgement deadlines. Even though an accountant has an extension it is the client’s responsibility to make sure the information is provided in a timely manner.