How Does Income Tax Work in Australia?

If you've just started working in Australia — or you're simply trying to understand your payslip — the tax system can seem more complicated than it needs to be. This guide walks through how it actually works, from your first dollar earned to lodging your return.

What Is Income Tax in Australia?

Income tax is a tax the federal government collects on money you earn — from a job, a business, investments, or rental property. It's Australia's largest source of government revenue, funding everything from healthcare and education to infrastructure. Unlike some countries, Australia has no separate state or regional income tax — the system is entirely federal, administered by the Australian Taxation Office (ATO).

Who Pays Income Tax?

Broadly, anyone who earns assessable income in Australia during the financial year (1 July to 30 June) is potentially liable for income tax — employees, sole traders, contractors, and investors alike. How much you pay, and which set of rates applies, depends on your residency status for tax purposes:

• Australian residents get the tax-free threshold and the full set of progressive brackets described below
• Foreign residents don't get the tax-free threshold and pay a flat 30% on income up to $135,000
• Working holiday makers (417/462 visa) follow their own schedule, starting at 15%

Tax residency isn't the same as your visa status — it's a separate test based on where you actually live and your ties to Australia, which trips up a lot of newcomers.

How Australian Income Tax Rates Work

Australia uses a progressive marginal tax system. This is the single most misunderstood part of the whole system: moving into a higher bracket does not mean all your income gets taxed at that higher rate. Only the portion of income that falls within each bracket is taxed at that bracket's rate — everything below it is still taxed at the lower rates.

2025-26 Resident Tax Brackets

See our full Australia Income Tax Rates guide for non-resident and working holiday maker schedules, plus the Low Income Tax Offset.

Tax-Free Threshold

The first $18,200 of income each financial year is tax-free for Australian residents — this works out to roughly $350 a week, $700 a fortnight, or $1,517 a month. You claim it by ticking the relevant box on the Tax File Number (TFN) declaration you complete when starting a job. If you have more than one employer, you should generally only claim the threshold with one of them — claiming it twice under-withholds tax and can leave you with a bill at tax time.

Taxable Income vs. Gross Income

Your gross income is everything you earn before anything is subtracted. Your taxable income — the figure the brackets actually apply to — is gross income minus any allowable deductions. This distinction matters because two people with the same salary can owe very different amounts of tax if one claims significantly more in deductions.

Medicare Levy

Most residents pay an additional 2% Medicare Levy on top of income tax, calculated separately from the marginal brackets. It funds Australia's public healthcare system. Lower-income earners pay a reduced rate or none at all, and some people qualify for a full exemption. There's also a separate, additional Medicare Levy Surcharge for higher earners who don't hold private hospital cover. See our full Medicare Levy Guide for the exact thresholds and how to avoid the surcharge.

PAYG Withholding — How Tax Actually Comes Out of Your Pay

Most employees never pay a lump sum at tax time because of PAYG (Pay As You Go) withholding — your employer deducts an estimated amount of tax from every payslip and sends it to the ATO on your behalf throughout the year, based on your TFN declaration and the ATO's official withholding tables. This is a prepayment, not your final tax bill; when you lodge your return, the actual amount owed is calculated and reconciled against what was withheld. For the full mechanics — how employers calculate it, what happens if you don't provide a TFN, and how it interacts with study loans — see our dedicated guide, PAYG Withholding Explained.

Tax Deductions and Tax Offsets

These two terms get confused constantly, but they work differently:

• Deductions reduce your taxable income before tax is calculated — common ones include work-related expenses, self-education directly connected to your job, and donations to registered charities. Their value depends on your marginal rate.
• Offsets reduce the tax you owe directly, dollar for dollar — the Low Income Tax Offset (LITO) is the most common, worth up to $700 for residents earning up to $66,667.

One structured way to reduce your taxable income before it's even paid to you is salary sacrificing into superannuation — see our dedicated guide, Salary Sacrifice Explained, and try the Salary Sacrifice Calculator.

Example: How Income Tax Works on a Salary

Here's the full picture for a resident earning $90,000 with no significant deductions:

Notice the effective rate (21.8%) is well below the person's marginal rate (30%) — this is the marginal system in action, since only the income above $45,000 is taxed at 30%.

Australian Tax Return Basics

The financial year runs 1 July to 30 June. Most individuals lodge their return between July and 31 October if self-lodging via myTax through myGov. If you use a registered tax agent and engage them before 31 October, you typically get an extended deadline — often well into the following May. Most of your income information (employer payments, bank interest) is pre-filled automatically via Single Touch Payroll by mid-to-late July, so it's worth waiting for that to populate before lodging.

Common Income Tax Mistakes

• Claiming the tax-free threshold with more than one employer — leads to under-withholding and a surprise bill
• Lodging before pre-fill data is complete — increases the risk of leaving out income or getting figures wrong
• Confusing deductions with offsets when estimating how much a claim will actually save
• Not keeping receipts for work-related deductions — the ATO can ask for evidence for any claim
• Forgetting the Medicare Levy Surcharge if income is high and there's no private hospital cover

Frequently Asked Questions

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