There is no special bonus tax rate
The short version is simple: a bonus is not taxed under a separate bonus tax scale. It is added to your ordinary income for the year and assessed under the same tax brackets that apply to salary and wages.
The confusion comes from the payslip. The amount your employer withholds from the one-off payment can look much harsher than the eventual tax you owe. That does not usually mean payroll got it wrong. It means payroll is following the ATO withholding method for irregular payments.
If you want the broader context for marginal tax brackets, Medicare levy, and what counts toward your final tax bill, the Australian income tax guide is the right companion page.
Why withholding looks high
For withholding, employers generally use ATO Schedule 5 for bonuses, commissions, back payments, and similar amounts. That method annualises the one-off payment when working out what to withhold in that pay cycle.
In practice, payroll temporarily treats the bonus as if a payment like that could keep arriving every pay period. That can push the withholding rate much higher than the final extra tax on the bonus once your full-year income is reconciled.
Example: On a $95,000 salary with a $5,000 bonus, the actual additional tax is about $1,600, but the temporary withholding can be about $2,080. The gap is not a second tax. It is an upfront withholding that gets reconciled in your return.
Source: ATO — Schedule 5 for bonuses and similar payments. The withholding cap is effectively 47%, being the top marginal rate of 45% plus the 2% Medicare levy.
Actual tax vs withholding
The cleanest way to think about it is this:
Actual tax on bonus = tax on (salary + bonus) − tax on (salary alone)
That final number can include more than income tax. Depending on your circumstances, the bonus can also increase Medicare levy, HELP repayments, or the Medicare Levy Surcharge. That is why two people on different salaries can keep very different amounts from the same bonus.
If too much was withheld in the pay run, the excess usually comes back when you lodge. If not enough was withheld across the year, you can still end up with a bill at tax time. The tax refund guide explains that reconciliation in plain English.
How HECS and MLS change the result
HELP repayments
On a $90,000 salary with an $8,000 bonus and a study loan, the bonus adds about $1,200 in HELP repayment on top of ordinary tax and Medicare. If your annual tax return is where these numbers usually surprise you, read the HECS/HELP repayment guide.
Medicare Levy Surcharge
On a $110,000 salary with no eligible private hospital cover, a $10,000 bonus adds about $400 in extra MLS. That can matter even when the income tax effect feels manageable. The dedicated MLS guide covers the thresholds and private health angle in more detail.
Source: ATO — Study and training loan thresholds and rates and ATO — Medicare levy surcharge thresholds and rates.
Super on bonuses
Many bonus payments that relate to ordinary hours of work are treated as ordinary time earnings, which means super is usually payable on them. That is why a cash bonus can increase both what you keep now and what goes into super.
The important caveat is that not every lump-sum payment is treated the same way. Overtime-linked payments and some termination-related amounts can be different. So this is an area where the label on the payment matters.
A $10,000 bonus can mean about $1,200 in additional employer super where the payment is part of ordinary time earnings, based on the current 12% SG rate.
Source: ATO — How much super to pay. Whether a specific bonus counts as ordinary time earnings depends on the nature of the payment.
Worked examples
| Base salary | Bonus | Actual extra tax | Likely withholding | Possible refund gap |
|---|---|---|---|---|
| $80,000 | $10,000 | $3,200 | $4,410 | $1,210 |
| $95,000 | $5,000 | $1,600 | $2,080 | $480 |
| $130,000 | $20,000 | $7,700 | $9,400 | $1,700 |
These are examples only. Your result can change materially if HECS, private hospital cover, reportable fringe benefits, or family MLS thresholds apply.
Frequently asked questions
Is there a special bonus tax rate in Australia?
No. A bonus is still taxed as ordinary income. What often confuses people is the withholding on the payslip: payroll may withhold more upfront using ATO Schedule 5, then the final tax is reconciled in your return.
Why does the tax on my payslip look higher than the actual tax?
ATO Schedule 5 annualises the one-off payment for withholding purposes. That can push the temporary withholding higher than the real extra tax on the bonus. Any excess is reconciled at tax time.
Can a bonus affect HECS repayments?
Yes. A bonus increases repayment income. That can push more of your income into HELP repayment bands, so the extra amount withheld is not always just income tax and Medicare.
Can a bonus affect the Medicare Levy Surcharge?
Yes. If you are near the MLS threshold and do not hold appropriate private hospital cover, a bonus can increase the surcharge you owe or move you into a higher MLS tier.
Does my employer pay super on a bonus?
Often yes, where the bonus forms part of ordinary time earnings. But not every one-off payment is treated the same way, so overtime-linked or termination-related amounts can differ.
