Tax-Free Threshold Australia: 5 Costly Mistakes to Avoid

The tax-free threshold lets an Australian resident earn the first $18,200 of income in a financial year before any income tax applies. That part is simple. The mistakes start when a second job, a side business or a mid-year arrival in Australia meets a threshold most people assume works automatically. The most expensive one is claiming the tax-free threshold on two jobs at once, which quietly under-withholds tax all year and leaves a bill at lodgment. Here are the five the Australian Taxation Office (ATO) sees most, each corrected against the current rules.

The tax-free threshold is worth about $350 a week, $700 a fortnight or $1,517 a month in income that carries no tax. You tell a payer you want to claim it on the tax file number (TFN) declaration you complete when you start. From there, most people forget about it, which is where the trouble starts.

What the tax-free threshold really is

For the 2026-27 financial year the resident individual income tax rates start like this.

The $18,200 is a single allowance against your total taxable income for the year, not a per-job or per-source figure. It applies once, no matter how many payers you have or whether the income is wages, business profit or both. Claiming it with a payer does not lower your tax by itself; it lowers how much tax that payer withholds from each pay. The final number is settled when you lodge your return. Four of the five mistakes below come from treating the threshold as something it is not.

Mistake 1: Claiming the tax-free threshold on every job

The belief: every employer asks whether you want to claim the tax-free threshold, so you tick yes on each one.

What the ATO says: where you have more than one payer at the same time, you generally claim the tax-free threshold from only one, usually the payer who pays you the most. You tell your other payers to withhold at the higher 'no tax-free threshold' rate. If you claim it from two payers and your combined income is above $18,200, each payer treats your first $18,200 with them as tax-free, so roughly $18,200 of income has no tax withheld against it when it should have been taxed.

What that costs: take someone with a $40,000 main job and a $25,000 second job, $65,000 in total. Claim the threshold on both and about $18,200 escapes withholding that should not have. At the 15% bottom rate that is roughly $2,730 owing at lodgment, and more if that income sits in the 30% band. The money was going to be taxed either way; claiming twice just defers the bill to a single lump sum.

What to do instead: claim the threshold on your highest-paying job and select 'no tax-free threshold' with the others on your TFN or withholding declaration. The ATO's tax withheld calculator helps you set the right rate so the year nets out near zero.

Mistake 2: "I earned under $18,200, so I don't need to lodge"

The belief: income below the threshold means no tax and nothing to file.

What the ATO says: you usually do not need to lodge a return where your income is under $18,200 and no tax was withheld. The catch is withholding. If a payer withheld any tax from income below the threshold, you have to lodge a return to get it back as a refund. And several situations force lodgment regardless of income: an active ABN, PAYG instalments, a study or training support loan, or franking credits you want refunded.

What to do instead: if you do not need to lodge, tell the ATO by lodging a non-lodgment advice so your record is not left open. If tax was withheld, lodge the return, because that withheld money is yours. Running a business under an ABN removes the choice entirely: you lodge even in a year the business made a loss.

Mistake 3: "My side business gets its own $18,200 on top of my salary"

The belief: a side business run alongside a job earns its own tax-free slice, so the first $18,200 of profit is untaxed.

What the ATO says: the threshold applies once, to your total taxable income. A sole trader reports net business profit in the same individual return as any wages, and the two are added together. If your salary already uses up the $18,200, every dollar of business profit stacks on top and is taxed from the first dollar at your marginal rate.

What that costs: a nurse on $70,000 who runs a weekend photography business is already past the threshold on wages alone. A $9,000 profit from the business is taxed at her 30% marginal rate, about $2,700 in income tax, with nothing withheld along the way because no employer handles business income. That is why a side business so often produces a tax bill in its first year.

What to do instead: set money aside from business income as you earn it, and keep clean records so the profit you declare is the real figure after deductions. Every legitimate expense you capture with an expense tracker lowers the profit the rates apply to. Once your business tax reaches a certain size the ATO enters you into PAYG instalments, which spreads the saving across the year for you.

Mistake 4: "A foreign resident or new arrival gets $18,200 too"

The belief: anyone who earns income in Australia gets the same $18,200 tax-free threshold.

What the ATO says: foreign residents for tax purposes get no tax-free threshold and are taxed from the first dollar. A foreign resident with $1 or more of Australian taxable income must lodge a return. If you became a resident partway through the year, you get a part-year tax-free threshold: at least $13,464, plus $4,736 divided by 12 and multiplied by the number of months you were a resident, counting the month you arrived.

What that looks like: John became an Australian resident on 17 April, so he was a resident for 3 of the 12 months. His threshold is $13,464 + ($4,736 ÷ 12 × 3) = $13,464 + $1,184 = $14,648, not the full $18,200. Residency here means residency for tax purposes, which is a separate test from your visa.

What to do instead: work out your residency status for the year before you assume the full threshold. New arrivals who claim $18,200 when they only qualify for a part-year amount end up under-taxed and owing the difference.

Mistake 5: "Claiming it means I pay no tax at all"

The belief: once you claim the tax-free threshold, your pay is tax-free up to $18,200 and you are square with the ATO.

What the ATO says: claiming the threshold changes how much a payer withholds, not what you owe. Withholding tables are an estimate, and your final tax is worked out at lodgment across all your income. Two things routinely surprise people. The 2% Medicare levy is a separate charge with its own low-income thresholds, so "no income tax" is not the same as "no tax". And if your circumstances shifted during the year, the withheld amount can land short of the real figure.

What to do instead: treat a pay slip that shows little or no tax as an estimate, not a settlement. If you have more than one income source or a mid-year change, check the numbers before lodgment rather than at it.

Which threshold applies to you

What it costs to get the threshold wrong

Every mistake above lands in the same place: a tax bill at lodgment instead of across the year. The ATO does not penalise you for claiming the threshold on the wrong job, but it does expect the shortfall paid, and interest can apply to amounts left outstanding after the due date. The fix is usually a withholding change made early in the year rather than a correction made after it.

The records side matters most if any of your income is self-employed. Wages arrive with tax already withheld; business income does not. A receipt scanner that captures expenses as they happen keeps your declared profit honest, and lodging on time keeps interest off the balance. To see how SparkReceipt handles business income and deductible expenses in one place, our plans start with a free trial.

Frequently asked questions

Should I claim the tax-free threshold on my second job? Generally no. Claim it on the job that pays you the most and select 'no tax-free threshold' on the second one, so you do not under-withhold and owe tax at lodgment.

What happens if I claimed the tax-free threshold on two jobs by accident? You will likely have a tax bill when you lodge, because about $18,200 of income had no tax withheld against it. Update your withholding declaration with one payer now to reduce the shortfall for the rest of the year.

Is the tax-free threshold $18,200 per job or in total? In total. It is a single allowance against your whole taxable income for the year, no matter how many payers or income sources you have.

Do sole traders get the tax-free threshold? Yes. As a resident sole trader your first $18,200 of total taxable income is tax-free. But business profit is added to any other income, so if wages already use the threshold, your profit is taxed from the first dollar.

I earned under $18,200. Do I still need to lodge a return? Only if tax was withheld, you held an active ABN, you had PAYG instalments, or another lodgment trigger applied. If none apply, lodge a non-lodgment advice instead so your record is complete.

Key takeaways

• The tax-free threshold is a single $18,200 allowance against your total taxable income, not a per-job or per-business figure.
• With more than one job, claim the threshold on the highest-paying one and use 'no tax-free threshold' for the rest, or you under-withhold and owe tax at lodgment.
• Income under $18,200 can still require a return: if tax was withheld you lodge to get it back, and an active ABN forces lodgment regardless.
• A side business gets no separate threshold. Its profit stacks on your wages and is taxed from the first dollar at your marginal rate.
• Foreign residents get no threshold at all, and part-year residents get a pro-rated amount of $13,464 plus a monthly share of $4,736.
• Claiming the threshold changes withholding, not your final tax, so check the numbers before lodgment if you have more than one income source.