Side income is taxed on top of your salary, at your marginal rate. See the estimated extra tax and a per-invoice set-aside % so a tax bill doesn't surprise you, from current ATO schedules.
Educational tool. Not financial advice.
Which question are you answering?
Your salary / wage income for FY26
Your PAYG salary already taxed at work. The side income stacks on top of this — leave it 0 if you have no salary.
$
Expected net side income for FY26
Your expected gross side income minus the deductible expenses you'll claim — the figure the extra tax is worked out on.
$
Do you have a HELP / study loan?
Yes — I have an outstanding HECS-HELP or other study and training loan.