How the Bonus Tax Calculator Works (With a Worked Example)
Shows how much of a bonus you keep once it is added to your annual income. 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 Bonus Tax 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 2 inputs. The table shows each one with the example value used later in this guide.
| Input | Example value |
|---|---|
| Annual salary ($) | 90000 |
| Bonus amount ($) | 10000 |
The formula
Tax on bonus = tax on (salary + bonus) − tax on salary. This is your real annual cost; the amount withheld on the payslip can differ.
Worked example
Entering the example values above gives these results:
| Result | Value |
|---|---|
| Bonus after tax | $6,800.00 |
| Tax on bonus (annual basis) | $3,200.00 |
| Effective rate on bonus | 32% |
The headline figure is $6,800.00 (bonus after tax). Change any input in the calculator and every result updates instantly, so you can test different scenarios side by side.
How the bonus after tax changes with bonus amount
The table below keeps every other input at the example value and moves only “Bonus amount ($)” up and down by 10% and 20%. It shows how sensitive the bonus after tax is to that one figure.
| Bonus amount ($) | Bonus after tax |
|---|---|
| 8,000 | $5,440.00 |
| 9,000 | $6,120.00 |
| 10,000 | $6,800.00 |
| 11,000 | $7,480.00 |
| 12,000 | $8,160.00 |
At 8,000 the result is $5,440.00; at 12,000 it is $8,160.00. If a small change in this input moves the answer a lot, it is worth double-checking that figure before you rely on the result.
A practical tip
Bonuses are often over-withheld on the payslip. Any excess comes back in your tax return.
Keep going
Before relying on the number, read Getting the Most From a Bonus Tax Calculator: Tips and Common Errors. You might also find these guides useful:
- Pay Rise Calculator: Formula, Example and What the Result Means
- Using a Leave Loading Calculator in Australia: A Step-by-Step Guide
- Redundancy Pay Calculator Explained for Australians
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 Bonus Tax 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.