Free Mechanic Invoice Template — No Signup
You finish a brake job, wipe the grease off, and now you're writing up a ticket at the parts counter while the next car idles on the lift. The customer wants to know why a $40 pad set costs $180, what the 'shop supplies' line is, and whether the diagnostic fee comes off the final bill. Generic invoices don't have lines for flat-rate labor times, core charges on alternators, or hazmat disposal — so you end up handwriting addenda. Billify is built for shop work: itemized labor by flat-rate hours, parts with markup, core charges, and shop supplies, with tax figured in. No signup. Data stays in your browser.
By KSP Labs, Software Studio behind Billify · Updated June 2026
Live editor — Mechanic invoice. No signup. Data stays in your browser.
What to include on a mechanic invoice
- Flat-rate labor hours (per operation)
- Diagnostic fee / scan time
- OEM and aftermarket parts with markup
- Core charges (alternators, batteries, calipers)
- Shop supplies / hazmat disposal fee
- Tire mount and balance
- Fluids (oil, coolant, brake fluid)
- Warranty parts ($0 with note)
Billing tips for mechanics
Put your shop's labor rate and the flat-rate hour estimate on every invoice — customers accept a $120/hr charge for 1.2 flat-rate hours far faster than a vague 'labor: $144,' because they can see the math. Apply the diagnostic or scan fee as a credit toward the repair when the customer approves it; that's standard shop practice and stops the 'I paid you to tell me what's wrong' complaint. Always list core charges on alternators, batteries, brake calipers, and some sensors as a separate line, and note that the core is refunded on return — it keeps the parts house happy and your margin clean. Add a shop-supplies or hazmat line (typically 8-10% of labor) to cover rags, brake clean, and used-oil disposal; burying it in parts hides the cost from the customer and from you when margins shrink. Mark warranty and goodwill parts as $0 with a note so the customer sees what you covered — it pays off in repeat business. Quote OEM vs. aftermarket on the estimate and on the invoice; a $60 aftermarket pad set versus a $120 OEM set is a real choice the customer should sign off on, and documenting it prevents comebacks. For tires, list mount, balance, valve stem, and disposal as separate lines, not a bundled 'tire install,' because each has a cost and a warranty implication. Set residential and retail terms to Net 15 or due-on-pickup — never let a car leave the lot unpaid without a signed repair authorization and a card on file. Add a storage fee line for vehicles left past 72 hours after notification, and state your lien rights under your state's mechanic's lien statute so a non-paying customer can't tie up your bay.
Mechanic invoice FAQ
Should the diagnostic fee come off the final repair bill?
Yes, apply the diagnostic or scan fee as a credit toward the approved repair — it's standard shop practice and makes the fee feel fair. If the customer declines the fix, the diagnostic fee still covers your tech's time and the bay. State this policy on your estimate and invoice so there's no argument at pickup.
How do I explain shop supplies and core charges to a customer?
List shop supplies as a small percentage of labor (8-10%) for rags, brake clean, and used-oil disposal, and core charges as a refundable line on alternators, batteries, and calipers. Showing them separately — instead of hiding them in parts — keeps your margin clean and avoids the 'what's this fee?' fight at the counter.
Do I need the customer to sign a repair authorization?
Always get a signed authorization before any work over your estimate threshold, and keep a card on file. Without it you can't legally hold the car for non-payment in most states, even under a mechanic's lien. The signature also protects you if the customer claims they never approved OEM versus aftermarket parts.
What payment terms should a shop use?
Retail and residential customers pay due-on-pickup or Net 15 — never release the keys unpaid without a card on file. Commercial fleet accounts can run Net 30, but price your labor to carry that float. Add a storage fee for vehicles left past 72 hours after you notify the customer.
How do I handle warranty and come-back parts on the invoice?
Mark warranty parts as a $0 line with a note like 'warranty — no charge' so the customer sees what you absorbed. Document the OEM-versus-aftermarket choice on the original invoice; if a part fails under warranty, that paper trail backs you up with the parts supplier and the customer.
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