Overtime, bonuses and how they are taxed in Australia
Reviewed by Mellow Editorial Team, HR & payroll content team
Overtime and bonuses are taxed as ordinary income in Australia — there is no separate, lower rate for either. Both are added to an employee's regular earnings for the pay period, and PAYG withholding is calculated on the combined total using the employee's marginal rate.
Why there is no special rate
A common misconception is that overtime or bonuses attract a flat penalty tax rate. They do not. The Australian tax system uses progressive income tax brackets, and PAYG withholding simply applies to whatever the employee earns in a given period. If a bonus or run of overtime shifts pushes an employee's annualised income into a higher bracket for that fortnight, the withholding on that payment will be higher — but that is the progressive system working as intended, not a special rule targeting extra pay.
The 2% Medicare levy applies to all taxable income in the same way, so it flows through to overtime and bonus payments without any adjustment.
How PAYG withholding works on a one-off payment
The ATO provides a method for withholding on irregular payments such as bonuses. The practical steps are:
1. Annualise the payment. Take the bonus or irregular amount and add it to the employee's expected annual earnings for the year. This gives you a notional annual figure.
2. Calculate the tax on that annualised figure using the current withholding tables or your payroll software's tax engine.
3. Subtract the tax that would have been withheld on the regular annual earnings alone. The difference is the withholding to apply to the bonus.
4. Remit that withholding to the ATO as part of your normal PAYG obligations.
In practice, most payroll platforms handle this automatically when you enter a bonus as a separate pay item. The important thing is to flag it correctly in your system so it is treated as a lump-sum addition rather than a recurring component.
For overtime, the process is simpler. Because it is paid in the same pay period as regular hours, payroll software just includes it in gross earnings for that cycle and applies withholding to the total. No separate calculation step is usually needed.
Superannuation on overtime and bonuses
This is where many employers get tripped up. The Superannuation Guarantee applies to ordinary time earnings, not to all earnings. Overtime payments are explicitly excluded from ordinary time earnings under the legislation, meaning you are not required to pay super on overtime hours.
Bonuses are more nuanced. A bonus linked to performance or as an incentive generally counts as ordinary time earnings, so super applies at the current Superannuation Guarantee rate of 12%. However, a bonus paid specifically as compensation for working additional hours — essentially overtime paid as a lump sum — may be excluded. The distinction matters, and if you are unsure how a specific payment is classified, it is worth confirming with your payroll adviser or the ATO's published guidance before processing.
HECS/HELP repayments
If an employee has a study debt, HECS/HELP repayments are calculated through payroll on a banded scale tied to their annual income. When a bonus or significant overtime payment pushes an employee's annualised earnings across a repayment threshold, the withholding for that period should reflect the higher band.
Again, payroll software that integrates tax withholding tables correctly will handle this automatically, but it is worth checking that your system has the employee's HECS/HELP debt flagged on their tax file number declaration. If it is not flagged, no study debt withholding will occur, and the employee may face a larger-than-expected tax bill at year end.
Reporting via Single Touch Payroll
Every pay event that includes overtime or a bonus must be reported through Single Touch Payroll at the time of payment — not monthly, not in a batch. STP transmits year-to-date earnings, tax withheld and super information to the ATO each time you run a payroll. Bonuses paid outside the normal cycle (for example, a mid-year incentive payment) still require an STP submission on the day or the day they are processed.
At the end of the financial year, you finalise payroll through STP by 14 July. This replaces the old payment summary process. Employees can then access their income statement through myGov to complete their tax return. Making sure bonuses and overtime are coded correctly in your payroll system throughout the year means the finalisation report accurately reflects what was paid and withheld — avoiding amended submissions and employee complaints.
The key discipline is consistent, correctly coded pay events rather than end-of-year corrections. If an employee's payroll records across multiple payment types are clean throughout the year, finalisation is straightforward.
---
Run HR and payroll in Australia with Mellow
Mellow brings HR, payroll and 12 AI agents into one platform — built to handle Australia properly, with payroll included, from £4 per employee per month. The AI agents don't just answer questions; they generate contracts, run cost estimates and draft letters for you.
[Start a free trial →](/register)