Bonus Tax Calculator Australia 2021
Estimate how much tax your 2020-21 bonus may attract in Australia using resident or non-resident tax rates, offsets, and an optional Medicare levy setting. This calculator compares tax on your base income with tax after your bonus is added, so you can see the likely extra tax and your estimated after-tax bonus.
Calculate tax on your bonus
Expert guide to the bonus tax calculator Australia 2021
If you received a one-off bonus during the 2020-21 Australian financial year, it is normal to feel confused about how much tax comes out of it. Many employees believe bonuses are taxed at a special or higher rate. In reality, a bonus is generally treated as ordinary income. What usually creates the impression of a “bonus tax” is the withholding method used in payroll and the fact that your bonus sits on top of your existing salary, meaning some or all of it can fall into a higher marginal tax bracket.
This page is designed to help you estimate the likely tax impact of a bonus for the 2020-21 year using Australian tax settings. The calculator works by comparing your estimated income tax on salary alone with your estimated tax after adding the bonus. The difference is the estimated tax attributable to the bonus. That makes the output much more useful than simply applying one flat percentage to the whole bonus.
How bonus tax works in Australia
Australia uses a progressive income tax system. That means different portions of your income are taxed at different rates. Your bonus does not automatically get taxed at one single “bonus rate.” Instead, it is added to your other taxable income. The extra tax depends on where your total income lands after the bonus is included.
For example, if your annual taxable salary is A$85,000 and you receive a A$10,000 bonus, your total taxable income becomes A$95,000. The first part of your income continues to be taxed at the lower bracket rates, while the top slice created by the bonus may be taxed at your current marginal rate. That is why two people receiving the same bonus can see very different after-tax outcomes.
2020-21 resident tax brackets in Australia
For Australian residents in the 2020-21 financial year, the standard marginal tax rates were as follows. These are the rates most people refer to when estimating how much extra tax a bonus may trigger.
| Taxable income | Tax on this income | Marginal rate on the next dollar |
|---|---|---|
| A$0 to A$18,200 | Nil | 0% |
| A$18,201 to A$45,000 | 19c for each A$1 over A$18,200 | 19% |
| A$45,001 to A$120,000 | A$5,092 plus 32.5c for each A$1 over A$45,000 | 32.5% |
| A$120,001 to A$180,000 | A$29,467 plus 37c for each A$1 over A$120,000 | 37% |
| Over A$180,000 | A$51,667 plus 45c for each A$1 over A$180,000 | 45% |
These rates tell you why a bonus can appear heavily taxed. If your base salary already places you in the 32.5% bracket, much of your bonus may also be taxed at 32.5%, and if the bonus pushes your total taxable income over A$120,000, a portion may be taxed at 37% instead.
Resident versus non-resident treatment
Your tax residency status matters. Australian residents benefit from the tax-free threshold and may also qualify for offsets such as the Low Income Tax Offset and the Low and Middle Income Tax Offset for 2020-21. Non-residents generally do not get the tax-free threshold and are taxed from the first dollar using different rates.
| Category | Residents | Non-residents |
|---|---|---|
| Tax-free threshold | Yes, up to A$18,200 | No |
| Base rate from first taxable tier | 0% then 19% | 32.5% from A$0 to A$120,000 |
| Medicare levy | Often applicable | Generally not applicable |
| 2020-21 offsets in this estimator | LITO and LMITO included | Not included |
Why payroll withholding on a bonus can look higher
One reason employees search for a “bonus tax calculator Australia 2021” is that the amount withheld from their payslip can look much higher than expected. Payroll systems often use withholding schedules that annualise a one-off payment or apply a method for additional payments, such as commissions and bonuses. The withholding amount is designed to improve the chance that enough tax has been collected during the year, but it does not necessarily equal your final tax liability once your tax return is lodged.
That distinction is important. There is a difference between:
- withholding, which is the amount your employer deducts and sends to the ATO during the year, and
- actual tax payable, which is the amount determined when your annual taxable income and offsets are calculated at tax return time.
If too much tax was withheld from your bonus, you may receive some of it back as a refund after lodging your return. If too little was withheld, you may have to pay the difference.
How this calculator estimates your bonus tax
This calculator uses a simple but practical framework:
- It estimates tax on your annual taxable salary before the bonus.
- It estimates tax on your annual taxable salary after adding the bonus.
- It subtracts the first figure from the second figure.
- The difference is shown as the estimated tax on the bonus.
- Your estimated net bonus is then the bonus less the estimated extra tax.
For Australian residents, the calculator includes 2020-21 resident marginal tax rates and applies the Low Income Tax Offset and Low and Middle Income Tax Offset. It can also apply a flat 2% Medicare levy if you select that option. This is useful for broad planning, although the real Medicare levy can involve low-income thresholds and family-specific adjustments.
2020-21 offsets that can reduce the apparent tax burden
The 2020-21 financial year included tax offsets that mattered for many employees. In particular:
Low Income Tax Offset (LITO)
- Maximum offset of A$700
- Phased down across higher income ranges
- Can reduce the tax impact on lower income earners
Low and Middle Income Tax Offset (LMITO)
- Up to A$1,080 for eligible taxpayers in 2020-21
- Applied when lodging your tax return
- Can materially change after-tax outcomes
Because these offsets depend on total taxable income, your bonus can sometimes reduce or phase out part of an offset. That means the effective tax on the bonus can be a little higher than your headline marginal rate. For example, a worker near an offset taper zone may lose part of an offset as income rises, increasing the true cost of an extra dollar earned.
Worked examples
Here are a few simple scenarios to illustrate why the result varies so much.
- Example 1: A resident earning A$55,000 with a A$5,000 bonus may see much of that bonus taxed at 32.5%, but offsets can soften the final annual result.
- Example 2: A resident earning A$115,000 with a A$20,000 bonus could have part of the bonus taxed at 32.5% and part at 37% because the total crosses A$120,000.
- Example 3: A non-resident earning A$90,000 with a A$10,000 bonus does not benefit from the tax-free threshold, so the estimated incremental tax can be materially higher than for a resident on the same income.
These examples show why a proper calculator is more useful than applying one single percentage to every bonus. The interaction between tax brackets, residency status, offsets, and Medicare settings can change the answer.
What this estimator does not include
No online calculator can cover every possible tax variable without a very long questionnaire. For simplicity, this estimator does not include:
- HECS-HELP, VET Student Loan, or other study and training support repayments
- Division 293 tax or reportable fringe benefits
- Salary packaging arrangements
- Private health insurance rebate interactions and Medicare levy surcharge
- Detailed low-income Medicare levy threshold calculations
- Superannuation guarantee or employer-specific payroll withholding methods
If any of these apply to you, use this calculator as a planning tool rather than a final tax determination.
How to use your bonus more strategically
Knowing the estimated after-tax amount of your bonus can help you make better financial decisions. Some common strategies Australians consider include:
- Paying down high-interest debt: credit cards and personal loans often cost more than the likely return on savings.
- Building an emergency fund: a bonus can be a fast way to create 3 to 6 months of basic living costs.
- Making a concessional super contribution: in some cases, contributing part of your bonus to super may offer tax advantages, subject to caps and personal circumstances.
- Setting aside money for tax: if your income is variable, it can be wise to keep a buffer until your annual tax position is confirmed.
Authoritative Australian sources
If you want to cross-check your estimate or read the underlying rules, start with these official and authoritative sources:
- Australian Taxation Office: Individual income tax rates
- Australian Taxation Office: PAYG withholding schedule for bonuses and similar payments
- Services Australia: Income information and related obligations
Final thoughts
The phrase “bonus tax” is convenient, but it can be misleading. In Australia, a bonus is typically just part of your taxable income, and the real issue is how much extra tax your total annual income creates. That is exactly what this 2021 calculator is built to estimate.
If you want a quick rule of thumb, start by looking at your marginal tax bracket. But if you want a better estimate, especially for the 2020-21 year, use a tool that compares tax before and after the bonus, includes residency settings, and recognises offsets. That approach gives you a far more realistic picture of what you are likely to keep.
This guide is general information only and does not constitute tax, legal, or financial advice. For complex circumstances, consult a registered tax professional or the ATO.