Do You Pay More Tax on a Second Job in Australia?

Why It Feels Like You're Taxed More on a Second Job

Do you pay more tax on a second job? Not technically, your income tax is based on total taxable income from every source combined for the year, worked out using the same marginal tax brackets everyone else uses. But it very often feels like more tax is being taken out, and that feeling has a real cause, it's about how PAYG withholding is calculated during the year, not about your actual tax rate.

How the Tax-Free Threshold Works Across Two Employers

Every Australian resident taxpayer gets a tax-free threshold, currently $18,200 a year, before any income tax applies. The catch is that you can only claim it with one employer at a time. When you start a job, the TFN declaration asks whether you want to claim the tax-free threshold from that payer.

This is why a second job can feel like it's taxed at a punitive rate, withholding on it is deliberately higher, so that by the end of the year, the combined tax withheld across both jobs is closer to what's actually owed on the combined income. It's a withholding mechanism, not a different tax rate applied to the second income itself.

Marginal Tax Rates: The Common Misconception

Australia uses a marginal tax rate system, only the portion of income that falls within a given bracket is taxed at that bracket's rate, the rest is taxed at the lower brackets below it. Income from a second job doesn't get taxed at a special "second job rate", it simply gets added on top of income from the first job, and whatever portion of total income lands in a higher bracket is taxed at that bracket's rate, same as if it had all come from one employer.

For full detail on how these brackets apply, including for sole traders, see our guide to Australian tax brackets and rates.

The Medicare Levy and a Second Job

The Medicare levy, generally 2% of taxable income for most taxpayers above the low-income thresholds, is calculated on total income for the year, the same way income tax is. It isn't charged separately per employer or doubled up because you have two jobs, it's simply part of the combined calculation done at tax time based on total taxable income.

What to Check With Each Employer

• TFN declaration, make sure the tax-free threshold is only claimed with the employer paying the higher income, claiming it twice generally leads to a tax bill at year end.
• Which job is "the main one", if income levels shift during the year, it's worth reviewing which employer should have the threshold claimed.
• Withholding variation, if the standard withholding rates are consistently over or under-collecting relative to actual liability, a withholding variation can be applied for through the ATO.
• HECS/HELP repayments, if applicable, these are also calculated on total income across all jobs, not per employer, and can add to what's withheld.

Reconciling at Tax Time

This is precisely why a second job often results in a refund at tax time, not because the ATO overcharges you during the year on purpose, but because the correct, cautious approach of not claiming the threshold twice tends to over-withhold slightly, which gets squared up once the tax return is lodged.

The Bottom Line

You don't pay more tax on a second job in the sense of a higher rate applying to it specifically, your total tax is based on combined income taxed at the normal marginal rates. What you will usually see is more tax withheld from the second job's pay throughout the year, because the tax-free threshold can only be claimed once, and that's a deliberate, correct part of how PAYG withholding is designed to work.