Each year, more than 14 million people in Australia fill out their tax returns, and of those who are eligible for a refund (about two-thirds), they get back little more than $2,800 on average. This results in a total refund of more than $30 billion. Therefore, it is in your best interest to ensure that you are doing everything in your power to obtain the largest possible return. You have until the 31st of October to file your tax return; but, if you are registered with a tax accountant before the 31st of October, you may be able to get a grace period that allows you to file your return later than the deadline.