AUTO REPAIR SHOP BREAK-EVEN CALCULATOR

What break-even means for a repair shop

Break-even is the month where gross profit exactly pays the bills that arrive whether the bays are full or empty. Below it, every month eats cash. Above it, each extra repair order drops its gross profit straight to the bottom line. For a shop the useful unit is not dollars but cars, because car count is what the service advisor can actually see and push on a Tuesday afternoon.

This is a different question from the startup cost calculator, which sizes the money you need before the first car arrives. Break-even is the volume you need every month after that.

How to use this calculator

1. Fixed cost. Pull last month’s rent, insurance, software, utilities and every wage that is not a technician on the clock. Shop software alone is a few hundred dollars a month at list — Tekmetric vs Shopmonkey lays out both price sheets.
2. Each repair order. Use your real ARO and parts share from the shop management reports. Use the parts gross profit you actually achieved, not the matrix you meant to run.
3. Effective labor rate. Labor sales divided by billed hours, not the number on the wall. The effective labor rate guide shows how to pull it.
4. How techs are paid. Pick flat rate, hourly, or enter a labor gross margin you already track. The choice changes where technician pay sits in the math (below).
5. Volume. Enter today’s cars per day and the days you are open. The margin of safety tells you how far sales can fall before you lose money.

Worked example

The sheet opens on an example three-tech shop: $17,600 of fixed cost, a $450 ARO with parts at 45% of sales and 50% gross profit, an effective labor rate of $128 (inside the healthy gap below a posted rate of about $140 per hour) and flat-rate technicians costing $46 per billed hour once payroll taxes are on. All of these are illustrative assumptions — change them.

Each repair order contributes about $260 toward overhead. That figure is the one to keep in your head: a lost car costs $260 of profit, not $450 of sales.

Flat rate or hourly changes the answer

On flat rate, technician pay rises and falls with billed hours, so it is a variable cost and comes off each labor dollar. On hourly pay the payroll is owed whether the bays are busy or not, so it moves into fixed cost. Switch the example shop to hourly at $16,000 a month of loaded tech payroll and break-even jumps from about $30,500 to about $43,400 — 4.4 cars a day instead of 3.1 — and the margin of safety at four cars a day goes negative. Neither plan is wrong; they just put the risk in different places. The trade-off is laid out in flat rate vs hourly pay, and pay levels in the mechanic salary guide; the BLS figure is $50,620 a year (median, May 2025).

The three levers that move it

Run the example shop through three single changes and watch the break-even line.

• Parts gross profit from 50% to 55%. Break-even sales fall to about $29,300. The usual target is 55–58% gross profit on parts; a sliding matrix built on the parts matrix calculator is how shops get there without overpricing cheap parts.
• Effective labor rate from $128 to $135. Break-even falls to about $30,000 and billed hours needed drop from 131 to 122. Closing the gap to the door rate — it should sit close to the posted door rate — is often cheaper than raising the rate. If the door rate itself is the problem, start with the labor rate calculator.
• ARO from $450 to $500. Break-even sales stay the same, but the car count needed falls from 68 to 61 a month — 2.8 a day. Fewer cars for the same money is the argument for thorough inspections over discount oil changes.