How auto repair shops make money

Every repair bill has two halves. The labor half is hours times the shop's labor rate. The parts half is every part that went into the car, sold for more than the shop paid its supplier.

The hours usually aren't the clock's. Shops look up each repair in a labor guide, which says how long the job should take on that car: the book hours. Many shops bill those, however long the job really took. In our example from the free lesson, a front brake job is 2 hours at $140/hour, so $280 of labor, plus pads and rotors that cost the shop $160 and sell for $256: a bill of $536 before tax.

These numbers are our example.

Some states write rules for the bill itself. In California, the final invoice has to list every part the shop supplied and say which ones are used, reconditioned or rebuilt.

A technician paid for a nine-hour day doesn't bill nine hours. Some time goes to waiting for parts, cars that don't show up, cleaning and test drives. The pay for those hours is the same, and so is the rent on the empty bay.

Book hours turn that around, too. A technician who knows a job well can finish it in less than the book time, and the shop still bills the book. A seized bolt that adds an hour is the shop's hour. So owners watch the hours their shop bills far more closely than the hours it's open.

The labor rate pays for all of it: the technician's wage and payroll taxes, the hours nobody pays for, the lifts and scan tools, rent, insurance, the service writer, and the owner. That's why a shop's rate is far above what its technicians earn an hour.

The Census counted 167,884 car repair and maintenance shops with staff in the US in 2022 (car washes included), selling $161B in all. Most are small: a general repair shop had about 4.6 people on its payroll, and 77.2% of general repair companies sold under a million dollars that year.

What a shop sells changes its money. An oil change shop does fast, set-price jobs on many cars a day. A tire dealer's sale is mostly the tire itself, so wages are a smaller share of its sales: 15.4%, against 26.8% at a general repair shop.

Chains run many of the quick-service shops. Monro, a chain of tire and car repair stores, ran 1,260 stores in early 2025, with sales that work out to roughly $949,000 a store. Valvoline's 2,180 stores, company-run and franchised, sold $3.5B in its fiscal year 2025.

And many mechanics work alone. The Census counted 225,471 one-person car repair businesses in 2024, mobile mechanics among them, taking in $60,000 each on average. Many work part-time, which pulls that average down.

US auto service technicians and mechanics held 825,800 jobs in 2025, by the count of the BLS, the government's labor statistics agency. Their median pay was $24.34/hour in May 2025, or $50,620 a year.

More of them work at car dealers' service departments than anywhere else: 32% of the jobs, against 25% at general (mechanical and electrical) repair shops. Another 15% were held by self-employed workers.

Technicians usually buy their own hand tools, while the shop owns the power tools and the diagnostic equipment. Some shops pay technicians by the hour; others pay them for the work they complete, which ties their pay to the book hours they bill.

A shop spends a lot before its first car: the building and its rent, lifts, tools, scan equipment, insurance and the parts accounts. Then customers find a new shop slowly, while the bills come every month from the start, so the owner's own pay is often the thing that waits.

States set their own rules for repair shops, and they differ. In California, every business that diagnoses or repairs cars for pay registers with the Bureau of Automotive Repair, mobile mechanics included, for $200 and the same again each year. Check your own state's rules, and your city's, before you sign a lease.