How do I know if a job actually made money for the shop?
Short answer
Track gross profit per bay hour on every job, not just whether the invoice looked big. A big invoice with a huge parts markup and low labor can still be a bad use of the bay.
A big ticket isn't the same as a profitable one
A $2,000 ticket that tied up a bay for two full days on a rare part with a thin markup can be worse for you than a $400 brake job that took ninety minutes. Bay time is your scarcest resource, more than technician headcount most weeks.
The number that actually matters
Gross profit per bay hour takes the total gross profit on a job (labor profit plus parts profit) and divides by the hours that bay was tied up, including wait time for parts or approval. It tells you which jobs to chase and which to quote high enough to make worthwhile or turn away.
Run it by job type over a quarter. You'll usually find diagnostics and common maintenance beat big comeback-prone jobs like head gaskets on certain cars, once you count the real bay time.
Use it to decide what work to say yes to
When a customer wants a job that historically ties up a bay for two days waiting on a backordered part, price the bay time into the quote or decline it if you can't. You're not obligated to take every job that walks in.
Gross profit per bay hour, two real jobs compared
| Job A: brake pads and rotors$380 gross profit / 4 bay hours including wait | $95 GP/bay hr |
|---|---|
| Job B: rare import head gasket$1,050 gross profit / 25 bay hours incl. 2-day parts wait | $42 GP/bay hr |
| Shop average target | $70-90 GP/bay hr |
The math: Gross profit per bay hour = (labor profit + parts profit on the job) divided by total hours the bay was occupied, from drop-off to pickup, not just wrench time.
Where owners get this wrong
- Judging job profitability by ticket total instead of gross profit per bay hour.
- Not counting parts-wait and approval-wait time as bay time when it physically sits in your bay.
- Chasing big-ticket jobs that are actually low-margin once bay time is counted.
Worth knowing: This works best once you have basic job costing in your shop management system. If you're still tracking on paper, start with your five most common job types before trying to run it on everything.
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