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Less gross pay does not mean the same percentage less net pay
When salary falls, less income sits in the higher tax slices. HELP and the surcharge may change too. That is why an 80% salary can leave you with more than 80% of your previous take-home pay.
Compare the monthly difference with any costs you stop paying on the extra day off. Commuting and work-related childcare can matter, but childcare subsidies and government benefits are outside this tool.
A 4-day week from a $100,000 full-time salary
With five equal working days reduced to 4, gross salary becomes $80,000. The no-HELP cash cost is $1,133 a month. With HELP it is $883 because the lower salary also reduces the compulsory loan repayment.
You keep 82.5% of the original take-home cash without HELP, even though gross salary falls to 80%. Any lower HELP payment leaves more debt outstanding than the full-time comparison. Fewer commutes or childcare days could change your household cost, but they are outside these figures.
Our four-day week study shows the after-tax cash cost across nine salaries, with and without HELP. It keeps a reduced paid week separate from full-time hours compressed into four days.
| Working pattern | Gross salary | Monthly cash |
|---|---|---|
| Five days, no HELP | $100,000 | $6,483 |
| 4 days, no HELP | $80,000 | $5,350 |
| 4 days, with HELP | $80,000 | $5,232 |
Reduced hours or compressed hours?
A 4-day week can mean a shorter working week or the same hours fitted into longer days. Ask the employer which arrangement is on offer before putting a percentage into your budget.
Confirm the ordinary hours, annual leave treatment, public holiday arrangements and employer super. Pro-rata pay depends on the contract and applicable award or agreement, not just the number of days on a calendar.
Make the decision in monthly terms
Use the change in take-home pay as the price of the extra time. Compare that with your household budget and the reason you want the change, whether that is caring responsibilities, study or simply more breathing room.
If responsibilities stay the same and spill into unpaid time, the shorter contract may not deliver the time you expect. Revisit the arrangement after a few weeks using actual hours rather than the planned schedule.
Common questions
Do I lose exactly 20% of take-home pay on a four-day week?
Not usually. A reduction to 80% of gross pay can reduce tax and HELP too. The exact net change depends on income, deductions, cover and household circumstances.
Does a compressed week reduce my salary?
Not automatically. If ordinary hours stay the same, the salary may stay the same. Confirm the employment arrangement rather than assuming four days always means 80% pay.
Sources you can check
Sources checked for this page on 3 October 2026. Statistics keep their own measurement dates.
- ATO: Australian resident income tax rates
- ATO: study and training loan repayment thresholds
- ATO: super guarantee
- Fair Work Ombudsman: pay and wages
- Fair Work Ombudsman: annual leave
- ATO: Medicare levy reduction for low-income earners
- ATO: Medicare levy surcharge thresholds and rates
- Tax Reform Act 2026: standard work deduction
- Official 2026 indexed HELP repayment amounts