Why was I billed 2 hours when the car was done in 1?

Flat-rate (book) billing: the industry guide assigns standard hours per job, and shops bill that figure regardless of actual time. It cuts both ways — if the job runs long, the customer still pays book time. Stating “labor billed per flat-rate guide” on the invoice pre-answers the question.

What is a shop supplies fee?

A small line covering consumables that are impractical to itemize — rags, brake cleaner, fasteners, gloves. Typical is 5–10% of labor with a dollar cap. It’s legitimate when disclosed; it looks bad when it appears without explanation, so label it clearly.

Free Auto Repair Invoice Template

Invoice auto repair clearly: itemize parts, labor hours and a diagnostic fee, with the vehicle details, then download a PDF.

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Business name

Address

Phone

Tax ID

Website

Bill to

Client name

Address

Tax ID

Invoice details

Invoice #

Issue date

Due date

Currency

PO number

Items

DescriptionQtyRateAmount

Tax & totals

Tax label

Tax rate %

Tax inclusive

Discount

Discount value

Shipping

Amount paid

Notes & payment

Notes

Terms

Payment details

Style

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What to include on a auto repair invoice

Shop name and contact
Customer and vehicle (make/model/VIN/mileage)
Parts with quantities
Labor hours and diagnostic fee
Tax, total and warranty/terms

How repair shops bill: book time, parts and authorization

Shops price labor from a flat-rate guide (“book time”): each job has a standard hours figure, multiplied by the shop’s labor rate — so the invoice says 2.5 hours even if your tech beat the clock. Parts carry a markup over wholesale, with OEM vs aftermarket noted. Diagnostics are a separate billed step, and most states require a written estimate and customer authorization before work begins — your invoice should reference that approval. A small “shop supplies” percentage line is common; cap it and label it honestly.

Typical shop charges (US)

Labor rates vary hugely by region and specialty (Euro/diesel higher):

Shop labor rate: $100–$180 per flat-rate hour
Diagnostic: $100–$180, sometimes credited to the repair
Front brake job (pads + rotors): $300–$600 per axle
Alternator replacement: $400–$800 parts and labor
Shop supplies line: commonly 5–10% of labor, capped at $25–$50
Parts: marked up from wholesale; OEM vs aftermarket noted per line

What belongs on every repair order/invoice

Vehicle year/make/model, VIN and mileage in — most states require it on the invoice
The customer’s authorization (date/time and how it was given) for the exact amount invoiced
Labor hours per operation, at the stated rate — not one merged labor line
Old-parts disposition: offer to return them; note hazardous disposal fees where charged
Warranty terms per repair — 12 months/12,000 miles is the common industry standard

FAQ

What should a auto repair invoice include?
Why was I billed 2 hours when the car was done in 1?: Flat-rate (book) billing: the industry guide assigns standard hours per job, and shops bill that figure regardless of actual time. It cuts both ways — if the job runs long, the customer still pays book time. Stating “labor billed per flat-rate guide” on the invoice pre-answers the question.
What is a shop supplies fee?: A small line covering consumables that are impractical to itemize — rags, brake cleaner, fasteners, gloves. Typical is 5–10% of labor with a dollar cap. It’s legitimate when disclosed; it looks bad when it appears without explanation, so label it clearly.

More invoice templates

New to invoicing? Read how to make an invoice.