An auto repair invoice does more work than most trade invoices. It is the customer’s proof of maintenance for resale, the warranty document for the parts you fitted, and — when a customer returns three months later claiming you caused a fault — the record of what you actually did and what you advised against.
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Key takeaways
Before any line item, record: registration, make and model, VIN, mileage in, and date of work. This block is what turns an invoice into a service record — and a service record is what makes the customer come back to you rather than the garage down the road, because you hold their vehicle’s history.
| Section | Example | Note |
|---|---|---|
| Vehicle | 2019 Ford Focus 1.5 TDCi · Reg AB19 XYZ · VIN WF0…3821 · 78,412 mi | Header block |
| Diagnostic | Diagnostic — fault code read and road test — 0.5 hr — $45 | Bill it; state if credited against repair |
| Labour | Timing belt and water pump replacement — 4.2 hrs @ $95 — $399 | Book time or actual, consistently |
| Parts | Each with part number, qty, unit price | See below |
| Consumables | Coolant 5L, sundries — $38 | Legitimate and expected |
| Environmental | Waste oil and filter disposal — $12 | Regulated disposal cost |
| Declined work | ADVISED: front discs below minimum (2.1mm). Declined by customer 14 Sep. | Text line — no charge |
| Warranty | 12 months / 12,000 miles on parts and labour | Text line |
Part numbers matter. Customers check prices online, and a named OE-equivalent part at a fair markup reads as honest. “Parts — $210” reads as something to argue about.
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When you advise a repair and the customer declines it, write it on the invoice. Specifically, with a measurement and a date:
“ADVISED: front brake discs measured 2.1mm against 2.0mm minimum; replacement recommended. Customer declined 14 Sep 2026.”
Six months later, if there is a brake problem, you have a signed, dated document showing you identified it and the customer chose not to proceed. This single habit resolves more garage disputes than anything else on the invoice.
Give a written estimate before work starts, and get authorisation — text or email is fine — before exceeding it. Many jurisdictions impose a legal limit on how far a final bill may exceed a written estimate without fresh consent, often around 10%. Exceeding that without authorisation can make the excess unrecoverable.
If you diagnose additional work mid-job, stop, quote it, and get a reply in writing. Two minutes on the phone followed by a confirming text is the difference between a paid invoice and a small claims hearing.
Either is acceptable as long as you are consistent and the customer knows which. Book time is standard in franchised dealers and is predictable for the customer; actual time can be fairer on unusually difficult jobs. State it on the estimate.
25–50% depending on the part and how it was sourced. This covers your procurement time, stock risk and the warranty you are giving on the fitted part.
It is not always legally required, but it is strongly advisable. It ties the work unambiguously to one vehicle, which matters for warranty claims and for the vehicle’s service history.
Yes, provided you told them the fee before you started. Diagnostic time is skilled labour with equipment costs behind it. Many garages credit it against the repair if the customer proceeds — a good commercial compromise.
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