Is a second job taxed at a higher rate in Australia?

No. Australia does not have a special tax rate for second jobs and you are not taxed twice. Your total income from all jobs is added together and taxed once at marginal rates. A second job is taxed at your marginal rate because it stacks on top of your first job's income — for example, if your first job pays $85,000, your second job's income falls in the 30% bracket plus the 2% Medicare levy.

Why did I get a tax bill on my second job?

The most common cause is claiming the tax-free threshold on both jobs. Each employer then treats your first $18,200 as tax-free, but you only get one tax-free threshold across all your income. That means too little tax is withheld during the year, so you owe the difference when you lodge your return. Claim the tax-free threshold on your higher-paying job only.

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

Generally no. Claim the tax-free threshold on your highest-paying job only. On your second (lower-paying) job, do not claim it, so the employer withholds tax at the 'no tax-free threshold' rate. This keeps your withholding closer to the tax you actually owe and avoids a bill at tax time.

Does a second job affect my HECS-HELP repayments?

Yes. Compulsory HECS-HELP repayments are based on your total repayment income across all jobs, not each job separately. A second job can push your combined income over the $69,528 minimum threshold (2026-27) or into a higher repayment tier, increasing your annual repayment — and because each employer withholds based only on what it pays you, HECS is another common reason for a tax-time shortfall.

How is tax on a second job calculated?

Work out the tax on your primary job alone, then the tax on both jobs combined, using the 2026-27 resident tax brackets and the 2% Medicare levy. The difference is the real tax attributable to your second job. This calculator does that for you and shows your effective second-job tax rate and what you actually keep.

Second Job Tax Calculator Australia 2026 — Why Am I Taxed So Much?

How Tax on a Second Job Works in Australia

The biggest myth about second jobs is that they're taxed twice, or at some special penalty rate. They're not. The ATO adds up your income from all your jobs and taxes the total once, using the same marginal brackets that apply to everyone. Your second job feels like it's taxed more because it stacks on top of your first job — so every dollar of it sits in your highest tax bracket.

Why a second job can leave you with a tax bill

The real culprit is PAYG withholding, not the tax rate. Each employer withholds tax as if they're your only job. If you claim the tax-free threshold on both jobs, each one treats your first $18,200 as tax-free — but you only get one tax-free threshold across all your income. The result is too little tax withheld during the year, and a bill when you lodge your return.

The fix: claim the threshold on one job only

Claim the tax-free threshold on your higher-paying job, and don't claim it on your second job. The second employer then withholds at the "no tax-free threshold" rate, which keeps your withholding much closer to the tax you actually owe. You can change this any time by giving your employer a new Withholding Declaration.

2026-27 tax brackets

$0 – $18,200: 0% (tax-free threshold)
$18,201 – $45,000: 15%
$45,001 – $135,000: 30%
$135,001 – $190,000: 37%
$190,001+: 45%
Plus 2% Medicare levy on all taxable income

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Second Job Tax Calculator Australia 2026-27

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