Tax file numbers and tax returns

Two pieces of admin connect you to the tax system: a tax file number, which identifies you to the ATO for life, and the tax return, the yearly settling up between what you owed and what was withheld. Both are far less painful than their reputations.

Your tax file number

A tax file number, or TFN, is a unique number the ATO issues to you once, for life. It does not change when you move, change jobs or change your name. Applying is free through the ATO, and anyone charging a fee to get you one is a scam. You will give your TFN to employers when you start a job, to your bank so interest is taxed correctly, and to your super fund.

Two things to know. First, your TFN is private: it is a key to your identity, so never share it in a text, an email or a job ad conversation before you have actually been hired. Second, it matters at work. If you do not give your employer a TFN declaration, the law requires them to withhold tax at the top rate from your pay. On a casual wage, that means nearly half of each pay disappears until you fix it. It comes back at tax time, but that is a long wait for money that was yours all along.

What happens every July

The Australian income year runs from 1 July to 30 June. After it ends, you lodge a tax return, a summary of what you earned and what tax was withheld, any time from 1 July to 31 October. Most people lodge online through myGov, linked to the ATO. By late July the return is mostly prefilled: your employer's figures and your bank interest are already sitting there waiting to be checked.

The return compares two numbers: the tax you actually owed for the year, and the tax withheld from your pay along the way. Withheld more than you owed? The difference comes back as a refund, usually within a couple of weeks. Withheld less? You pay the difference. For students earning under the tax free threshold, the answer is nearly always a refund of everything withheld.

Deductions and the part people misread

A deduction is an expense you can subtract from your income before the tax is worked out, so it lowers the amount your tax is calculated on. To claim one it has to be genuinely connected to earning your income, you have to have paid for it yourself without being reimbursed, and you need a record such as a receipt. The classic student examples are the cost of a uniform your job requires, tools you had to buy, or union fees. Here is the part people get wrong: a deduction does not hand you back what you spent. It only saves you the tax on that amount, so a $100 deduction for someone on a 30% marginal rate saves $30, not $100. That is still worth claiming, but a deduction is a discount on tax, never a refund of the whole expense, which is why buying something just to claim it always leaves you worse off.

A refund is not a bonus

It is tempting to treat a tax refund as free money that arrives every winter, but a refund is simply your own money coming back because too much was withheld during the year. A big refund is not a win, it just means the ATO was holding more of your pay than it needed to, interest free, for months. So the goal is not the largest possible refund. It is having the right amount withheld in the first place, which for a student under the threshold means claiming the tax free threshold at your job so little or nothing is taken, and then getting on with the year rather than waiting on a lump sum in July.