Tax-Free Threshold & Second-Job Tax in Australia Explained (2026)

If you've just picked up a second or casual job and noticed a much bigger tax bite on those payslips, you're not being punished for working harder. You're seeing the tax-free threshold rule in action. This guide explains how the $18,200 threshold works across multiple jobs, which job to claim it on, and why the extra tax usually sorts itself out when you lodge your return.

Note: this is tax (ATO) information, not a Fair Work entitlement. For your pay and leave rights when working two jobs, see our second job rights guide. For the tax side below, the Australian Taxation Office is the authority.

The tax-free threshold is the first $18,200 of your annual income that you don't pay tax on. According to the ATO, the threshold applies to your total income from all sources for the year — not to each job separately. That single point is the source of nearly all the confusion about second jobs.

Because the threshold is a yearly, whole-of-income figure, you can generally only claim it from one payer at a time. When you start a job and your employer hands you a Tax file number declaration, the question "Do you want to claim the tax-free threshold from this payer?" is asking which single employer should apply that $18,200 of tax-free room to your pay.

No — in almost all cases you should claim the tax-free threshold from only one employer, usually your highest-paying or most regular job, and answer "No" on the second job's declaration. The ATO advises that where you have more than one payer at the same time, you generally claim the threshold from only one of them.

Claiming it on your main job means the tax-free room is applied where most of your income sits. Your second job then has tax withheld from the first dollar you earn there, which is correct, because that income stacks on top of your main income and is taxed at your marginal rate.

Your second job isn't taxed at a special higher rate — it just has no tax-free room applied, so PAYG is withheld from the very first dollar. On your main job, the first $18,200 is tax-free, so the withholding tables start gently. On a second job where you haven't claimed the threshold, the employer withholds using the "no tax-free threshold" rate from dollar one. The ATO is clear that this is not extra tax — it's more tax withheld upfront, and it reconciles when you lodge your return.

In practice this is usually the right outcome. Your second job's income is added on top of your first, so it's genuinely taxed at a higher marginal rate than the first few thousand dollars of your main job. Withholding from the first dollar is the system's way of collecting roughly the right amount across the year.

If you claim the threshold on two jobs at once, each employer gives you $18,200 of tax-free room, so too little tax is withheld overall — and you'll likely face a tax bill when you lodge. The ATO warns that claiming the tax-free threshold from more than one payer at the same time usually leads to under-withholding and a debt at tax time. If you've accidentally done this, lodge a new Withholding declaration (NAT 3093) with one of your employers to stop claiming the threshold there.

Assume someone earns $50,000 from a main job and $15,000 from a second job in 2026, claiming the threshold on the main job only. The table below shows the principle (illustrative figures, not exact withholding-schedule amounts — your payslip will vary).

The key takeaway: regardless of how it's withheld, your total tax for the year is the same once you lodge. Claiming the threshold correctly just makes your fortnightly withholding closer to the final figure, so there are fewer surprises.

If your combined income from all jobs will stay under $18,200 for the whole year, you may pay no tax at all, and having tax withheld from a second job can mean you're over-paying through the year and waiting for it back as a refund. The ATO notes you can ask a payer not to withhold, or vary your withholding, if you don't expect to earn above the threshold across all your payers. If you're confident your total will be below $18,200, you can claim the threshold on the job you expect to earn the most from.

You change it by lodging a new Withholding declaration (NAT 3093) with the relevant employer, or by applying for a PAYG withholding variation through the ATO. Per the ATO, you can use a withholding declaration to start or stop claiming the tax-free threshold with a payer, and you can apply for a variation if you expect your circumstances (such as earning above $18,200 across all payers) to leave you over- or under-withheld. If you're unsure, the safest default is to claim the threshold on your highest earner and leave the rest unclaimed — then reconcile at lodgement.

Claim the tax-free threshold from one job only, usually your main one. Your second job will have more tax withheld upfront, but that's not a penalty — it's the system collecting the right amount across the year, and it squares up when you lodge. The genuine mistake to avoid is claiming the threshold on two jobs at once, which leaves you under-withheld and facing a bill.

For figures, declarations and variations, always check the ATO directly, as thresholds and forms can change. This article is general information, not tax advice.

Should I claim the tax-free threshold on my second job?

Generally no. The ATO says you should claim the $18,200 tax-free threshold from only one payer at a time, usually your highest-paying or most regular job. Answer 'No' to claiming the threshold on your second job so the right amount of tax is withheld.

Why is so much tax taken out of my second job?

Because no tax-free room is applied to it. On your main job the first $18,200 is tax-free, but on a second job where you haven't claimed the threshold, PAYG is withheld from the first dollar. The ATO confirms this is not extra tax — it's more withheld upfront, and it reconciles when you lodge your return.

What happens if I claim the tax-free threshold on two jobs?

You'll likely get a tax bill. Each employer applies $18,200 of tax-free room, so too little tax is withheld overall. The ATO warns this causes under-withholding. Fix it by lodging a Withholding declaration (NAT 3093) to stop claiming the threshold with one employer.

Do I pay more total tax for having two jobs?

No. The tax-free threshold applies to your total annual income from all sources, not per job. Your overall tax for the year is the same once you lodge — claiming the threshold correctly just makes your fortnightly withholding closer to the final amount.

How do I change which job claims the tax-free threshold?

Lodge a new Withholding declaration (NAT 3093) with the relevant employer, or apply for a PAYG withholding variation through the ATO. This lets you start or stop claiming the threshold with a particular payer.