How to Invoice as a Mobile Mechanic in Australia
By Dan Reeve — Working handyman and founder of SMASH Invoices. Built SMASH after losing $1,200 in uninvoiced jobs in a single year. He still takes on handyman work and uses SMASH on every job. About Dan →
To invoice as a mobile mechanic in Australia, you need your ABN, business name, a detailed parts and labour breakdown, the vehicle details, and GST if registered. Mobile mechanics lose money two ways: parts and fluids never itemised on invoices, and verbal quotes disputed after the job is done. An itemised invoice with customer approval protects against both, and takes under 60 seconds to generate on-site.
What mobile mechanics forget to invoice
Parts are the big one. You invoice the labour. The parts get added roughly, or absorbed, or forgotten in the rush to the next job.
- Engine oil — 5 litres at $12–$18/litre: $60–$90
- Oil filter: $12–$28
- Air filter: $15–$35
- Spark plugs (set of 4): $30–$80
- Brake pads (pair): $45–$120
- Brake fluid: $20–$30
- Coolant: $25–$40
- Serpentine belt: $35–$80
A standard service — oil, filter, air filter — costs the mechanic $90–$150 in parts. If those parts aren't itemised, they eat directly into the labour margin. And mobile mechanics typically charge lower labour rates than workshop mechanics to compensate for lower overhead, which makes absorbing part costs even more damaging.
"I'd do a full service — oil, filter, plugs, the lot. Invoice for the service, $180. I had $110 in parts sitting in my bill from the auto store. Net for three hours: $70. I was working for $23 an hour and wondering why the business wasn't viable." — Marcus B., Mobile Mechanic, Perth WA [PLACEHOLDER]
The verbal quote trap for mechanics
The other money leak: the quote you gave over the phone.
"Roughly $250 for a service." They heard $200. You meant $250 minimum depending on what you find. You find a cracked serpentine belt while you're in there. Add $80. Now it's $330.
"That's not what you said."
No written quote. No approved scope. No protection.
The fix is simple: send a quote via portal link before you start. They see the itemised cost including parts. They approve it. They can't dispute what they already signed off on.
A properly itemised mobile mechanic invoice
| Item | Qty | Unit | Total |
|---|---|---|---|
| Labour — full logbook service | 2 hrs | $110/hr | $220.00 |
| Call-out fee (mobile) | 1 | $60.00 | $60.00 |
| Engine oil 5W-30 | 5L | $14.50/L | $72.50 |
| Oil filter — Ryco | 1 | $22.00 | $22.00 |
| Air filter | 1 | $28.00 | $28.00 |
| Cabin filter | 1 | $32.00 | $32.00 |
| Subtotal | $434.50 | ||
| GST | $43.45 | ||
| Total | $477.95 |
The phone quote was "around $250." The actual, properly invoiced, cost is $477.95. The difference isn't overcharging. It's being accurate. The customer knew what they were approving before you cracked the bonnet.
How to invoice before closing the bonnet
You're wiping down the engine bay. Phone up. Speak:
"Full logbook service. Labour two hours. Call-out. Five litres 5W-30, Ryco oil filter, air filter, cabin filter."
Invoice built. Parts priced from catalogue. Your labour rate. Customer gets a portal link. They pay before you pack the tools. Done.
Frequently asked questions
Do mobile mechanics need to charge GST in Australia? Only if annual turnover exceeds $75,000. Mobile mechanics doing a high volume of services may reach this threshold. Once registered, all invoices must be labelled "Tax Invoice" with GST shown separately. Track your rolling 12-month turnover, you must register within 21 days of exceeding the threshold.
Can mobile mechanics charge a call-out fee in Australia? Yes. A call-out or mobile service fee to cover travel, time, and the convenience of on-location service is standard. It should be disclosed in your initial quote and appear as a separate line item on the invoice. Most mobile mechanics charge $40–$80 per call-out depending on distance.
How should mobile mechanics invoice for parts in Australia? Each part should appear as a separate line item with the part name, quantity, unit price, and line total. Parts are typically charged at cost plus 15–25% markup. Do not absorb parts into the labour rate, it reduces transparency, creates dispute risk, and hides your true cost-of-goods.
What should I do if I find more problems during a mobile service? Stop work. Call the customer and get verbal approval, then follow up with a digital quote amendment before continuing. If you do extra work without approval and add it to the invoice, customers can legitimately dispute the additional charge. A 30-second phone call followed by a portal link protects you.
What invoicing app works best for mobile mechanics in Australia? The best invoicing app for mobile mechanics is one that lets you invoice on-site without typing and handles parts as separate line items automatically. SMASH Invoices generates invoices from voice descriptions, you describe the service and parts used, and the app prices everything from its Australian materials catalogue. No manual parts lookup required.
You didn't become a mechanic to type. You became a mechanic to fix things. Start Free →
Internal links: How to price materials automatically in a quote · She put the last $50 back in her purse · What is a customer approval portal?