Australia’s income tax system is progressive — the more you earn, the higher the rate on each additional dollar. But your entire income is not taxed at one rate. Each dollar is taxed according to the bracket it falls into, which means understanding the difference between your marginal tax rate and your effective tax rate matters enormously for financial planning.
This cluster covers how the Australian income tax system works from the ground up: the official ATO tax brackets, the Medicare levy, PAYG withholding, and how different types of income are treated.
How Income Tax Works
- How Australian Income Tax Works — A plain-English walkthrough from gross income to tax payable, including the role of offsets and the Medicare levy
- Australian Tax Brackets 2025–26 — The four income brackets, the rates that apply to each, and a worked example at common salary levels
- Marginal vs Effective Tax Rate Explained — The most misunderstood concept in Australian tax — your marginal rate is not what you pay on all your income
- Australian Tax Year Explained (1 July – 30 June) — Why the Australian tax year runs July to June and what that means for reporting and deadlines
Medicare Levy
- Medicare Levy Explained — Who pays the 2% Medicare levy, the low-income threshold below which it phases in, and how it appears on your tax return
- Medicare Levy Surcharge — Who Pays It — The additional 1–1.5% that applies to higher earners without adequate private hospital cover, and the income thresholds
How Tax Is Collected
- PAYG Withholding Explained — How employers deduct tax from wages before you receive them, and why your tax return reconciles the difference
- PAYG Instalments — When and How — For investors, sole traders, and others with income not subject to PAYG withholding
Tax on Specific Income Types
- Tax on a Second Job in Australia — Why a second job appears to be taxed at a higher rate, and how to manage your withholding
- Tax on Freelance and Contractor Income — ABN invoicing, no withholding, PAYG instalments, and quarterly obligations
- Tax on Dividends, Interest and Rental Income — How passive income is treated differently from wages
- How a Bonus Is Taxed in Australia — Why your bonus appears to be taxed heavily and how the annual reconciliation corrects this
- Tax on Redundancy Payments — Genuine redundancy tax-free amounts, the $12,524 base plus annual component, and excess tax treatment
- Tax on Termination and Leave Payouts — How unused annual leave and long service leave payouts are taxed on termination
Residency and Foreign Income
- Australian Tax Residency Rules — How the ATO determines whether you are an Australian tax resident, and why it matters
- How Foreign Income Is Taxed in Australia — Declaring overseas income, foreign income tax offsets, and double tax agreements
- Double Tax Agreements Australia — The network of DTAs that prevent the same income being taxed twice
High Earners and Business
- Tax on High Income in Australia ($180k+) — The 45% bracket, Division 293 super surcharge, and strategies high earners use
- Company Tax Rate Australia — The 25% rate for small businesses and 30% for larger companies
- Sole Trader vs Company Tax Compared — When it makes financial sense to incorporate versus staying as a sole trader
- Am I Paying Too Much Tax? — Common reasons Australians overpay tax and how to check your withholding is correct
This cluster provides general tax information only. Tax rules are complex and individual circumstances vary significantly. For advice tailored to your situation, speak with a registered tax agent or accountant. Find one through the Tax Practitioners Board register.