Australian employers often assume casual workers cost more because of the 25 per cent loading on the hourly rate. Once you factor in leave entitlements, super, payroll tax, recruitment churn, supervision overhead, and the lost productivity of ramping up new starters, permanent employees can sometimes cost less per useful hour worked. The honest answer depends on your roster volatility, your award, and how much output you actually need from each role. This guide gives you the hard numbers, a calculation formula, and the compliance traps to watch.

Why this blog exists

The cost comparison between casual and permanent staff is the workforce question we get asked the most. The default mental model, that casual is 25 per cent more expensive, is almost always wrong in both directions. For high-volatility roster patterns, casual is often cheaper than the math suggests because you do not pay for unused capacity. For stable, predictable rosters, permanent staff are usually the lower cost option once the full picture is in. The mistake is treating the question as a simple rate-on-rate comparison. The real comparison is total employer cost per hour of useful output, and that calculation has eight inputs, not two.

We are Wise Recruitment and Consulting, a licensed Victorian labour hire agency working with warehouse, food production, and manufacturing employers across Melbourne and Sydney. The numbers below are drawn from current award rates, ATO and Fair Work guidance, and the workforce models we build with our clients.

What is casual work?

Before the cost comparison, the definitions need to be tight.

Fair Work’s definition of casual employment. Under the amendments to the Fair Work Act effective from 26 August 2024, a casual employee is one with no firm advance commitment to ongoing work. That definition pulled the focus back to the practical reality of the engagement, not just the words used in the employment contract. If a worker is on a regular, predictable roster with an expectation that the work continues indefinitely, they may already be a permanent employee under the law, regardless of what their contract says.

The 25 per cent casual loading: what it covers and why it exists. Most modern awards specify a 25 per cent loading on the base hourly rate. The loading is paid in lieu of: annual leave, personal and carer’s leave, paid public holidays, notice of termination, and redundancy entitlements. It also reflects the variable nature of the engagement and the worker’s lack of access to ongoing income.

Casual vs permanent: the key legal distinctions.

• Permanent employees accrue annual leave (4 weeks per year for full-time), personal and carer’s leave (10 days per year), public holiday pay, and notice on termination. Casuals receive the loading instead.
• Permanent employees have an expectation of ongoing employment. Casuals do not.
• Permanent employees can claim unfair dismissal after the minimum employment period (6 months at most employers, 12 months for small business). Casuals only qualify if they meet the regular and systematic engagement test.
• Both categories accrue superannuation at the current 12 per cent guarantee rate. Both attract WorkCover and payroll tax above thresholds.

These definitions matter because the cost comparison rests on what each category gets paid for and what it does not.

Casual loading vs permanent salary explained

The simplest cost comparison takes one role, holds the hours constant, and compares the gross employer outlay.

Hourly pay comparison. Use a warehouse role under the Storage Services and Wholesale Award 2020 as the working example. Level 1, day shift, 2026 award rate $26.20 per hour (illustrative, check the current rate at fairwork.gov.au).

Element	Permanent full-time	Casual
Base hourly rate	$26.20	$26.20
Casual loading 25%	n/a	$6.55
Hourly cost to employer (wage only)	$26.20	$32.75
Annual leave accrual (4 wks)	Approx. $2.18/hr	Included in loading
Personal leave accrual (2 wks)	Approx. $1.09/hr	Included in loading
Public holiday pay	Approx. $0.50/hr	Included in loading
Notice and redundancy (avg.)	Approx. $0.30/hr	Included in loading
Super 12%	$3.14	$3.93
Loaded hourly rate	Approx. $33.41	Approx. $36.68

On a like-for-like 38 hour week, the casual costs roughly $124 more per week than the permanent on this calculation alone. That is the number employers stop at. The next four sections explain why that number is incomplete.

Leave entitlements and how they shift the math. Permanent staff take their annual and personal leave. While they are away, you either pay overtime to other staff, hire a casual to cover, or accept the productivity loss. None of those costs sit in the table above. A realistic permanent salary calculation needs to add roughly 8 to 12 per cent for cover costs.

Superannuation and payroll tax treatment. Both categories attract super. Payroll tax applies above the state threshold to both. In Victoria the threshold is $900,000 in annual wages and the rate is 4.85 per cent. The loading is included in the payroll tax base for casuals, which slightly increases the casual cost.

Rostering flexibility. A permanent full-time employee costs you the same whether the warehouse is busy or quiet. A casual is only paid when they are on site. For roles with predictable demand, that flexibility has no value. For roles with variable demand, it has significant value and can completely overturn the headline cost comparison.

Permanent part-time vs casual pay rates

The middle option that most employers miss.

When part-time permanent is cheaper than casual. Part-time permanent employees receive the base rate plus leave entitlements, paid out pro rata, with no 25 per cent loading. For a 25 hour week on a predictable roster, the cost difference vs a casual on the same hours is real money.

Worked example, 25 hours per week at $26.20 base rate:

• Part-time permanent: $655 base + roughly $52 for super and leave loading. Approx. $725 per week, all-in.
• Casual: $818 base including loading + roughly $98 super. Approx. $916 per week, all-in.

The part-time permanent costs around $190 per week less for the same hours, with the trade-off that the employer commits to those hours every week.

Stable rosters vs variable shifts: the cost implications.

• Stable demand: part-time permanent wins. The employer captures the value of predictability.
• Variable demand with up to 30 per cent week-to-week swing: casual usually wins. The premium is offset by not paying for unused hours.
• Highly variable demand or seasonal peaks: labour hire wins. The agency carries the back-fill risk and the employer does not commit to either a permanent role or a roster.

Retail and hospitality worked examples. A Melbourne retailer with a stable 30 hour per week front-of-house demand pays roughly $230 less per week per role with a part-time permanent instead of a casual on the same hours. A Sydney bar with demand ranging from 20 to 40 hours per week pays roughly $150 more per week with a part-time permanent because they end up paying for hours not used.

Hidden costs employers forget

The headline rate comparison misses four categories of cost that often determine which model actually wins.

Staff turnover. Casuals typically turn over faster than permanent staff. Industry surveys put warehouse casual turnover at 60 to 90 per cent annually. Each turnover event costs roughly $2,000 to $4,000 in recruitment, induction, on-the-job training, and the productivity loss while the new starter ramps up. If you go through three casuals to fill one role across a year, that is real money the table above did not capture.

Overtime exposure with insufficient casual coverage. If your casual pool is not deep enough, you fill gaps by paying time-and-a-half to existing permanent staff. On a warehouse role under the standard award, overtime hours cost roughly $39 per hour vs the casual’s $33 hourly cost. Three overtime hours per week per role wipes out the savings on a permanent vs casual comparison.

Productivity loss during ramp-up. A new casual on day one is producing roughly 50 per cent of an experienced permanent’s output. By day five, perhaps 75 per cent. By the end of the first month, 90 to 100 per cent. If your roles turn over often, you are constantly running with sub-100 per cent output across some part of the team.

Admin burden of managing a variable casual roster. Roster building, last-minute fills, no-show backfills, payroll variability. Industry rule of thumb: one to two hours of supervisor or HR time per casual per week. At a loaded $55 per hour for that supervisor, that is $55 to $110 of hidden weekly cost per casual you carry.

Full-time vs casual calculator: a simple formula employers can use

A practical formula to run on the back of an envelope.

Step 1: total annual outlay for the permanent option.

Permanent annual = (base hourly rate x 38 x 52)
                  + super (12% of base)
                  + leave cover cost (10% of base)
                  + payroll tax (your state rate on the total above)
                  + recruitment cost amortised (low for permanent)
                  + supervision overhead (low)

Step 2: total annual outlay for the casual option, for the same actual hours worked.

Casual annual = ((base hourly rate x 1.25) x actual hours worked)
                + super (12% of loaded rate)
                + payroll tax (your state rate on the total above)
                + turnover cost (3,000 x expected turnovers per year)
                + ramp-up productivity loss (estimate 10% of first month’s pay)
                + roster admin (1.5 hr supervisor time x 52 weeks x supervisor cost)

Step 3: divide each by the productive hours actually worked. That is your real cost per useful hour. Compare.

Example: a warehouse role with stable demand at 38 hours per week.

• Permanent: approx. $66,500 all-in annual cost / 1,944 productive hours = $34.21 per hour
• Casual (same role, same hours, 1.5 turnovers/year): approx. $79,800 all-in / 1,944 productive hours = $41.05 per hour

Permanent is $6.84 per hour cheaper on a stable, predictable role.

Example: a warehouse role with variable demand averaging 28 hours per week.

• Permanent full-time (oversized for actual demand): approx. $66,500 / 1,456 productive hours = $45.67 per hour
• Casual: approx. $61,200 / 1,456 productive hours = $42.03 per hour

Casual is $3.64 per hour cheaper on a role that does not need a full 38 hours.

Break-even point. As a rough guide, casual is the cheaper option when actual hours worked drop below about 75 per cent of full-time equivalent on roles with awards that pay the 25 per cent loading. Above that threshold, permanent (full-time or part-time) usually wins.

Compliance risks for employers

The cost comparison is incomplete without the legal exposure.

Sham casual arrangements. Calling a worker casual when the engagement is in reality regular, systematic, and ongoing is now squarely in Fair Work’s enforcement focus. Penalties for misclassification can reach $19,800 per breach for an individual and $99,000 for a corporation, and underpaid entitlements must be back-paid in full.

Casual conversion rules under the Fair Work Act. From 26 August 2024, the casual conversion framework changed. Eligible casuals can give written notice to their employer requesting conversion to permanent status after 6 months (or 12 months for small business). The employer must respond in writing with a decision within 21 days. Failing to respond, or refusing without one of the specified valid grounds, exposes the employer to Fair Work proceedings.

Underpayment exposure. Casual loading sits on top of the correct base rate. Get the base rate wrong, get the casual rate wrong, multiplied by every casual on your roster. Award interpretation errors are the single most common source of large back-payment claims.

Recent Fair Work enforcement. Fair Work has prioritised casual misclassification, underpayment of penalty rates, and incorrect casual loading calculations in its 2025-26 compliance program. Several large warehouse and food manufacturing operators have entered enforceable undertakings with seven-figure back-payment obligations.

Which employment type is best? Quick answers

Is casual employment cheaper for employers?
Only when your actual hours worked fall well below full-time equivalent. For stable, predictable rosters, permanent (full-time or part-time) is usually cheaper once leave cover, turnover, and admin are factored in.

What does casual loading cover?
The 25 per cent loading is paid in lieu of annual leave, personal and carer’s leave, public holiday pay, notice of termination, and redundancy entitlements. It does not cover super, which is paid on top.

Can casual employees become permanent?
Yes. Under changes to the Fair Work Act effective 26 August 2024, eligible casuals can give written notice requesting conversion to permanent status after 6 months (12 months for small business). The employer must respond within 21 days.

Is permanent part-time cheaper than casual?
On stable rosters with predictable hours, yes. Part-time permanent receives base rate without the 25 per cent loading, plus pro-rata leave entitlements. The trade-off is the employer commits to those hours every week.

When does casual make sense?
When demand is genuinely variable, when you cannot reliably forecast a stable roster, for short-term project work, for seasonal peaks, and for trial periods before offering permanent employment. Labour hire often beats casual for the same use cases because the agency carries the recruitment and back-fill risk.

When do permanent employees deliver better ROI?
For roles with stable demand, where productivity gains from experience accumulate (technical roles, supervisors, equipment operators), and where customer or client relationships matter. The cost premium for permanent staff is often recovered in productivity and retention within 6 months.