You need to ask yourself if all taxable income you receive is real salary/wages 'i.e covered by Pay as You Go Withholding Tax 'PAYG', stated on a group certificate, with tax withheld per pay period). If not Pay as You Go Installments are required to be paid by the ATO over a certain amount.

Think of it like this. If you employer doesn't withhold the tax someone else has to.

Best to speak to your parents/accountant regarding your tax situation.

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