An overtime tax calculator question is usually really two questions: how much extra gross pay did the overtime create, and how much tax will payroll withhold from the pay run? This site estimates the gross pay side. Tax withholding depends on ATO tables, declarations and the rest of the pay period.
Start with the overtime calculator to estimate extra gross pay, then use official ATO tools or payroll advice for withholding.
Why overtime can look heavily taxed
Overtime can push a single pay period into a higher withholding amount. That does not necessarily mean the overtime is permanently taxed at that rate. Tax is reconciled across the financial year when a tax return is lodged.
For example, a worker may see more tax withheld in a fortnight with a large overtime shift, but the final annual tax position depends on total income, deductions and offsets.
What this site can estimate
- Gross ordinary pay from base hourly rate and ordinary hours.
- Gross overtime pay from higher-rate hours.
- The total gross pay estimate before tax.
- The difference between ordinary pay and the overtime pay period.
Do not use a gross overtime calculator as tax advice. Use it to understand the pay components, then compare the result with payroll records and ATO guidance.
Related calculators and guides
Common questions
Is overtime taxed more in Australia?
Overtime can cause more tax to be withheld in a pay period, but final tax depends on annual taxable income.
Does this calculator estimate net pay?
No. The calculators on this site estimate gross pay before tax.
Why did payroll withhold so much tax from overtime?
Payroll withholding tables apply to the pay period. A large overtime week can produce a higher withholding amount for that run.
Worked example using this guide
Example: $35 base rate with 6 overtime hours at time and a half. The estimate is $35 x 1.5 x 6 = $315 extra gross pay before tax withholding. Use this as a gross-pay sense check, then compare it with the exact award, agreement or payroll rate that applies to the job.
If the shift includes more than one pay type, split it into separate lines before calculating. Ordinary hours, overtime, Sunday work and public holiday work can all use different multipliers. This is also why a payslip with a single blended hourly amount is harder to audit than a payslip that separates hours and rates.
For the fastest cross-check, open the overtime calculator, Sunday rates calculator, public holiday pay calculator or time and a half calculator in another tab and enter the same base rate and hours.