Contractor Hourly Rate Mistakes Australians Make and How to Avoid Them

Updated 24 August 2026 · Business and gst

A Contractor Hourly Rate Calculator gives a fast answer, but the answer is only as good as what goes in. These are the mistakes we see most often with contractor hourly rate calculations in Australia, and how to avoid them.

1. Forgetting on-costs

An employee costs well above their salary once super, workers comp and payroll tax are included.

2. Mixing up margin and markup

A 50% markup is a 33% margin. Pricing with the wrong one can erase profit.

3. Spending GST collected

GST belongs to the ATO. Keep it aside until your BAS is due.

4. Undercharging as a contractor

Your rate must cover super, leave, unbilled time and business costs, not just the salary you want.

5. Overlooking the detail that matters most here

Allow for leave, sick days and quiet periods. Few contractors bill more than 46 weeks a year.

How the hourly rate (excl. GST) changes with super to fund yourself

A common mistake is getting one input slightly wrong. Here is what happens to the hourly rate (excl. GST) when “Super to fund yourself (%)” is off by up to 20% in either direction, with everything else held steady.

Super to fund yourself (%)	Hourly rate (excl. GST)
10	$86.96
11	$87.68
12	$88.41
13	$89.13
14	$89.86

At 10 the result is $86.96; at 14 it is $89.86. If a small change in this input moves the answer a lot, it is worth double-checking that figure before you rely on the result.

A quick sense check

Rate = (target income + super + business costs) ÷ (billable weeks × billable hours). With typical inputs the calculator returns hourly rate (excl. GST) of $88.41. If your own result looks wildly different, check that each figure is in the right unit and period (weekly, monthly or yearly) before drawing conclusions.