Penalties are imposed on a case–by-case basis and depend on your lodgment history, amount of tax payable and when your tax return is lodged. We cannot tell you whether a penalty will be applied, or the amount, before you lodge your tax return.
However, our policy is not to apply a penalty if your tax return:
is lodged voluntarily, and
does not result in any tax payable.
If your tax return results in you having to pay money to the Tax Office and you don't pay on time, we may impose general interest charges starting from the date the payment was due.