Tracking Margin by Job Type to Find the Leaks

Why this matters

A blended margin is an average, and an average is where losers hide. Your shop can run a healthy overall number while one whole category of work bleeds, carried by the categories that pay. You will never see it in a single bottom-line figure because the winners and losers net together. Tracking margin by job type breaks the average apart so the leak has nowhere to hide. This is the measurement discipline. For spotting a suspect in the field before you measure, see related: Finding the Services That Quietly Lose You Money.

Step one: define job types that actually differ

Group work into a handful of categories that behave differently on margin, not a hundred line items.

• Sort by the shape of the work: service calls, diagnostics, installs and replacements, maintenance, emergency and after-hours, warranty and callback, plus any big category unique to your trade.
• Keep it to something like six to ten buckets. Too few and you re-blend the very thing you are trying to separate. Too many and nobody keeps it up.

The test of a good bucket: jobs inside it earn roughly alike, and it earns differently from the bucket next to it.

Step two: capture the same four things on every job

Per-type margin is only as honest as what you feed it. For each job, tag its type and record:

• Revenue booked: what you actually billed, before tax.
• Parts and material cost: what you paid, not what you charged.
• Loaded labor: real hours on the job times the fully burdened rate, not the wage. Loaded means wage plus payroll taxes, insurance, and the other costs of employing the tech, so an hour reflects what it truly costs.
• Direct job costs: permits, rental, subcontractor, disposal, and the fuel and drive time if you can get it.

Revenue minus those three cost lines is the job's gross margin. Tag, capture, done.

Step three: roll it up and rank

Once tagged, the report is simple and brutal.

• Total revenue, total cost, and margin percentage for each job type.
• Rank the types by margin percentage, worst at the top.
• Put a volume column next to it. A thin margin on high volume bleeds far more than a thin margin you rarely sell.

Margin percent times volume is where the real dollars are. A category at a modest margin that you run constantly can cost you more than a clearly negative one you touch twice a year.

Reading the report without overreacting

The ranking points, it does not sentence. Before you act on a low type:

• A low margin on a category that feeds high-margin follow-on work (a cheap diagnostic that lands the install) may be earning its keep downstream. Check what it leads to. See related: The Loss Leader and Whether It Ever Makes Sense.
• A low margin from stale pricing is a price fix, not a reason to drop the work.
• A low margin from rework or windshield time is an operations fix, not a pricing one.

Name why the type is thin before you decide what to do about it.

What to do with what you find

Each leak type has a matching lever:

• Underpriced type: raise its price to your target margin.
• Cost-bloated type: pass through the supplier increases, tighten the labor on it, or requote the parts.
• Rework-heavy type: fix the quality or the scope definition, not the price.
• Genuinely unprofitable and leads nowhere: shrink it, requalify it, or drop it. See related: Drop a Service That's Barely Profitable.

Make it a habit, not a project

The value is in the trend, not a one-time snapshot.

• Review it quarterly at least, and always before an annual price review, so you raise the prices that need it instead of an even blanket bump.
• Watch the direction. A type sliding three quarters running has a developing problem worth catching now.

Once the tagging is part of closing a job, the report builds itself and the average never fools you again.

References

• SBA, job costing and profitability analysis
• Standard managerial-accounting practice on loaded labor and contribution margin
• See related: Finding the Services That Quietly Lose You Money, Knowing Your True Cost Before You Set a Price, The Annual Price Review Every Shop Should Run