Casual vs Permanent Employee: The True Cost Comparison

Most Melbourne business owners decide between casual and permanent staff by comparing hourly rates: casual loading (typically 25% under most Modern Awards) makes casual pay look more expensive per hour worked. That comparison is incomplete. Permanent employees carry costs that never show up on a weekly payslip — accrued leave, superannuation guarantee, workers' compensation, and the cost of turnover and retraining. Getting this comparison right matters more as headcount grows, because the wrong staffing mix compounds every pay run.

Why the hourly rate comparison is misleading

Casual loading exists specifically to compensate for the absence of paid leave entitlements — no annual leave, no personal leave, no notice period in most cases. It is not a premium for flexibility alone; it's a substitute for benefits permanent employees receive elsewhere in the relationship. Comparing casual and permanent pay rates without accounting for what that loading is replacing understates the true cost of permanent employment and overstates the cost of casual.

1. Superannuation applies to both — this is not where the difference lies

A common misconception is that casual employees don't attract superannuation guarantee. They do, on the same basis as permanent staff, provided they meet the standard eligibility criteria. If a business has been treating casual staff as exempt from super, that's a compliance gap, not a cost saving — and one the ATO actively checks for.

2. Leave accrual is a real, growing liability for permanent staff

Every week a permanent employee works, annual and personal leave accrue as a liability on the balance sheet, whether or not that leave has been taken yet. Over a year, this typically adds the equivalent of several weeks' additional cost per permanent employee — cost that's real even if it's not immediately visible in weekly payroll figures.

3. Turnover and retraining cost more with casual arrangements

Casual roles typically see higher turnover, and every departure carries a real cost: advertising, interviewing, onboarding, and the productivity dip while a new person gets up to speed. For roles requiring any meaningful training period, this cost can outweigh the loading saving within a single replacement cycle.

4. Rostering flexibility has a real value, but it's often overestimated

Casual employment does offer genuine flexibility to scale hours up or down with demand, which has real value for genuinely variable workloads. But if a "casual" role has worked the same 30-35 hours a week for over a year, that flexibility is theoretical, not actual — and the business is paying loading for flexibility it isn't using.

5. Casual conversion changes the calculation over time

Under casual conversion rules, employees with regular, predictable hours over a sustained period may become entitled to convert to permanent employment. Businesses that keep long-serving staff on casual arrangements purely to avoid leave liabilities risk both a Fair Work compliance issue and a missed opportunity to lock in lower per-hour cost once genuine regularity is established. It's worth reviewing casual staff rosters at least annually to check whether hours have quietly become permanent in all but name.

Workers' compensation and other costs that vary by employment type

Workers' compensation premiums are generally calculated on total wages paid, so the premium itself doesn't necessarily differ much between casual and permanent staff for the same role. Where the real difference shows up is in claims experience — permanent staff with lower turnover and more consistent training tend to have fewer workplace incidents over time in many industries, which can influence a business's premium rating over successive years. This is a longer-term cost that rarely factors into an initial hiring decision but compounds the same way leave accrual and turnover costs do.

How to model the decision properly

• Base pay or loading — the Award or Agreement rate applicable to the role
• Superannuation guarantee — applies to both casual and permanent
• Leave accrual — annual and personal leave, permanent only
• Workers' compensation premium — rate varies by employment type and industry classification
• Turnover and training cost — a realistic estimate based on the role's actual historical turnover

Comparing full annual cost per role against expected productive hours — rather than comparing hourly rates alone — gives a far more accurate picture. For roles with genuinely variable demand, casual usually still wins. For roles with steady, predictable hours, permanent frequently comes out ahead once the full picture is modelled properly.