Tax Return Due Date: The due date for individual tax returns in Australia is typically 31st October each year. However, if you use a registered tax agent, you may have a later due date, often in May of the following year.
Penalties for Late Tax Returns: The Australian Taxation Office (ATO) can charge you a "late filing penalty" (FTL). This penalty is calculated by adding $275 for each 28 days or part of it that your tax return is overdue, up to a maximum of $1,375. For bigger organizations, the penalty can be even higher, multiplied by two or five.
Consequences of Late Filing: The ATO can take legal action and use debt collection agencies to recover unpaid tax debts.