Contractor Calculator: Work Out Your Real Rate as an Australian Tradie

Most tradies become contractors without ever actually running the numbers. They hear what a mate’s charging, add a few bucks to their old wage, and call it a rate. Then six months later they’re busier than ever, working 50-hour weeks, and somehow still struggling to make rent.

A proper contractor calculator does one thing: it tells you what you actually need to charge just to break even — let alone build a business. If you’re going subby, quoting jobs, or running your own show as a sole trader, this is the maths you need to do before you write a single invoice.

Why Your Old Wage Isn’t Your New Rate

When you were on the tools as an employee, your employer was covering a stack of costs you never saw. Super, work cover, public liability insurance, sick days, annual leave loading, tools, vehicles, and the hours they spent doing your tax. All of that was baked into your wage — hidden.

When you go out on your own, every single one of those costs becomes yours. And if you don’t account for them in your rate, you’re subsidising your clients out of your own pocket.

Here’s the rough breakdown of what gets added when you go contractor:

• Superannuation: 11.5% on top of your pay — you have to put this aside yourself
• Work cover / personal accident insurance: varies by trade, but budget 3–5%
• Public liability insurance: $1,500–$3,000+ per year depending on trade and coverage
• Leave entitlements: you don’t get paid when you’re sick, on holiday, or when a job gets rained out
• Tool replacement and maintenance: often $2,000–$10,000+ per year depending on trade
• Vehicle costs: fuel, servicing, rego, insurance — if you’re using it for work, it’s a business cost
• Accounting and admin: BAS lodgement, end of year returns, bookkeeping software
• Unpaid hours: quoting, invoicing, chasing payments, sourcing materials

Add it all up and most tradies are looking at a 35–50% overhead load on top of their target take-home. That means if you want to clear $1,200 a week in your hand, you might need to be billing $1,700–$1,800 a week just to cover your costs.

What a Contractor Calculator Actually Does

A good contractor calculator takes your target income — what you actually want to clear after tax — and works backwards to give you a required hourly or day rate. It factors in:

• Your target annual take-home pay
• Number of billable weeks per year (not 52 — account for leave, sick days, and slow periods)
• Your overhead costs (insurance, tools, vehicle, accounting)
• Superannuation (you need to pay this regardless of whether you’re employed or not)
• Income tax obligations as a sole trader or company

The result is a break-even rate — the floor below which you’re going backwards. From there, you add your margin for profit, growth, and contingency.

Use the Boss Tradie Subby to Salary Calculator to run these numbers for your situation. It’s built specifically for Australian tradies and handles the super, tax, and leave calculations that most generic wage calculators get wrong.

Billable Hours: The Number Most Contractors Get Wrong

Here’s the killer mistake: assuming 52 weeks at 40 hours a week = 2,080 billable hours per year.

In reality, a typical tradie might work 46–48 weeks a year after taking annual leave and sick days. Of those weeks, you’re not billing for every hour you work. Time spent quoting, travelling between jobs, picking up materials, invoicing, and chasing payments all eats into your billable hours without generating revenue.

A realistic number for most solo tradies is somewhere between 1,400 and 1,600 billable hours per year. Run your numbers on that, not 2,080.

Example: if you’re targeting $100,000 take-home and have $25,000 in overheads, you need to gross around $145,000–$150,000 (factoring in tax). Spread over 1,500 billable hours, that’s a required rate of $97–$100/hr. A lot of tradies pricing themselves at $75–$80/hr are quietly going backwards.

Day Rate vs Hourly Rate: Which Should You Use?

This depends on your trade and how you work. Day rates suit trades where jobs run over multiple days and the scope is reasonably predictable — labour-only installs, maintenance work, site-rate contracting. Hourly rates work better for reactive or variable work where you genuinely can’t estimate duration upfront.

When quoting day rates, be explicit about what’s included. Materials, travel, call-out, and after-hours should all be separate line items or clearly excluded. Ambiguity on a day rate is how disputes start.

Whichever way you price, the underlying maths is the same: total costs divided by available hours. Use the Advanced Tradie Calculator if you want to model different pricing scenarios — project-based, day rate, and hourly — side by side.

GST: Don’t Forget to Register

Once you hit $75,000 in annual turnover, you’re required to register for GST. Most tradies doing reasonable volume will hit that threshold quickly.

The critical thing to understand: GST is not your money. You collect it on behalf of the ATO and hand it back each quarter via your BAS. Treating GST income as available cash is one of the fastest ways to end up in trouble with the tax office.

When you’re calculating your contractor rate, be clear on whether you’re quoting ex-GST or inc-GST. For business-to-business work, always quote ex-GST and add it on invoice. For residential customers, most tradies include it in the final price to keep things simple — just make sure your invoices show the GST component clearly.

How to Check If Your Current Rate Is Working

If you’re already out on your own and want to know whether your rate is actually working, here’s a quick gut-check:

• Add up your last 12 months of invoice income (excluding GST)
• Subtract your business expenses — tools, insurance, vehicle, accounting, materials if applicable
• What’s left is your gross profit before tax
• Run that through a sole trader tax calculator to get your net take-home
• Divide by 52 — is that what you expected to be earning per week?

If the answer is “less than I was on as an employee,” your rate needs to go up or your costs need to come down. There’s no third option.

Many tradies find this exercise confronting. Running the numbers honestly is better than finding out at tax time that you’ve worked a full year and cleared less than minimum wage.

What To Do With This Information

Once you know your break-even rate, you’re in a position to quote with confidence. You stop guessing. You stop undercutting yourself to win jobs. You start pricing for profit instead of just trying to stay busy.

The next step is factoring in where you want to be in 12 months — whether that’s hiring your first employee, buying a new vehicle, or just building a buffer so a slow month doesn’t wipe you out. All of that requires a margin above your break-even rate, not a rate that just covers costs.

Run your numbers properly using the Boss Tradie Contractor Calculator. It takes less than five minutes and it’ll tell you exactly what you need to be charging to make this work — not just survive it.

Stop guessing. Know your number.