Part-Time Pay Calculation in Australia

The Pro-Rata Formula

Part-time permanent salaries scale the full-time package by the fraction of ordinary hours you work:

Pro-Rata Salary = Full-Time Salary × (Your Weekly Hours ÷ Full-Time Weekly Hours)

Example: a $90,000 full-time role at 38 hours/week, worked part-time at 20 hours/week:

• Fraction: 20 ÷ 38 = 52.63%
• Pro-rata gross: $90,000 × 0.5263 = $47,368.42/year
• Estimated FY 2026–27 take-home: $41,980.00 — about 59% of the $70,680.00 full-time net

Run your own hours in the Part-Time Salary Calculator.

Why Net Pay Falls Less Than Hours

Australia's progressive tax system means the first $18,200 is tax-free and the next slice pays only 15% — income at part-time levels is taxed more lightly per dollar than the top slice of a full-time salary. Halving your hours therefore costs less than half your take-home pay, an effect worth modelling before negotiating reduced hours.

Part-Time vs Casual: Same Hours, Different Deal

• Part-time permanent: pro-rata annual leave (2 weeks on a 0.5 fraction), paid sick leave, paid public holidays on your ordinary days, and 12% SG.
• Casual: a loading (commonly 25%) instead of those entitlements — compare the same hours on the Casual Pay Calculator.

For the conversion between hourly rates and annual figures behind both arrangements, see How Hourly Pay Converts to Annual Salary.