Using a Marginal Tax Rate Calculator in Australia: A Step-by-Step Guide
Shows the tax bracket you are in and how much of your next dollar you keep. This guide walks through what each input means, the formula behind the answer and a worked example using typical Australian figures. You can follow along in the free Marginal Tax Rate Calculator.
Why it matters
Australia taxes individuals on a progressive scale, so each extra dollar can be taxed at a different rate from the last. On top of income tax, most residents pay the 2% Medicare levy, and many carry HELP debts that are repaid through the tax system. Employers withhold tax from each pay under PAYG, and the annual tax return squares up the difference.
What you need to enter
The calculator asks for 1 input. The table shows each one with the example value used later in this guide.
| Input | Example value |
|---|---|
| Annual taxable income ($) | 120000 |
The formula
Your marginal rate is the rate on the bracket your last dollar falls into. The calculator also measures tax on an extra $1,000 so offsets and the Medicare levy are included.
Worked example
Entering the example values above gives these results:
| Result | Value |
|---|---|
| Marginal tax rate | 30% |
| Marginal rate incl. Medicare | 32% |
| Tax on the next $1,000 | $320.00 |
| Kept from the next $1,000 | $680.00 |
The headline figure is 30% (marginal tax rate). Change any input in the calculator and every result updates instantly, so you can test different scenarios side by side.
A practical tip
Your marginal rate is what matters for deductions: a $1,000 deduction saves $1,000 × your marginal rate, not your average rate.
Keep going
Before relying on the number, read Common Marginal Tax Rate Mistakes (and a Better Way). You might also find these guides useful:
- Tax Refund Estimator Explained for Australians
- How the Work From Home Deduction Calculator Works (With a Worked Example)
- Car Expense Deduction Calculator: Formula, Example and What the Result Means
Frequently asked questions
- Are these results exact?
- They are estimates based on standard resident rates. Your actual tax depends on your full circumstances, offsets and any private health insurance position. The ATO’s own tools or a registered tax agent give a definitive answer.
- Do the calculators work for non-residents?
- No. Non-residents have different rates, no tax-free threshold and no Medicare levy. These calculators assume you are an Australian resident for tax purposes.
- When do tax rates change?
- Rates usually change on 1 July, the start of the Australian financial year. Check the ATO website each July for the current figures.
Run your own numbers in the Marginal Tax Rate Calculator.
Open the calculatorGeneral information only. Rates and thresholds change, usually on 1 July. Confirm current figures with the ATO or the relevant authority, and get personal advice for decisions about your situation.