If you lodge your tax return late and fail to meet the deadline, you may have to pay a late lodgement penalty.
This amount is calculated by reference to penalty units. The value of a penalty unit changes from time to time. One penalty unit is currently equal to $210.
The penalty amount accrues at one penalty unit for each period of 28 days (or part thereof) after the lodgement due date, capped at a maximum of five penalty units.
If your tax return is late, it is important to lodge it as soon as possible, even if you are not sure if you will be able to pay the tax debt immediately. If you need help with paying you might be able to organise a payment arrangement with the ATO. You can find out more about this here.