Your 45% Job Was Really a 24% Job. Here's Where the Margin Went.

Commercial and residential service jobs get bid on a margin that feels real. The estimate says 45% gross. You win the work, you do the work, and at year-end the company margin is nowhere near 45%. The money did not vanish. It leaked out through four costs that almost never get allocated back to the specific job that incurred them.

Here is the waterfall, and how to rebuild it from your own numbers.

The 45% that becomes 24%

Start with a job bid at a 45% gross margin. Watch what happens as the real costs land.

Leak 1: labor that was never fully burdened (about 9 to 11 points)

Most bids price the billable on-site hour at something close to the tech's wage plus a rough markup. Two things get missed. First, the burden: payroll taxes, workers comp, and benefits run 35 to 60% on top of base wage (SmartBarrel). Second, the non-billable day: only about 61% of a tech's paid day is actually billable, the rest is drive time, procurement, and admin (RunClockwork). When you divide the fully burdened daily cost across only the billable hours, the true cost per billable hour is well above the wage you bid against.

For reference, the BLS median wage is about $29 per hour for HVAC mechanics (SOC 49-9021), $31 for plumbers (47-2152), and $30 for electricians (47-2111) (BLS OEWS). Multiply by 1.35 to 1.60 for burden (payroll taxes, workers comp, and benefits), then load only the billable hours, and the real number climbs fast.

Leak 2: callbacks and warranty labor (about 4 to 6 points)

Return trips get booked as new dispatches or absorbed silently, so the original job keeps its clean margin on paper while a second crew visit eats the profit. Field-service benchmarks put the callback rate at 8 to 14% of jobs (Spaid). If you are not charging that return labor back to the original job, that job's real margin is lower than the report shows.

Leak 3: material price drift between bid and buy (about 2 to 3 points)

Fixed-price bids lock the sell price, but the material cost floats between the estimate and the purchase. Construction input prices have moved several points over six-month windows in recent years (BLS Producer Price Index, inputs to construction). On a job quoted weeks before the material is bought, that drift comes straight out of margin.

Leak 4: the financing cost of slow receivables (about 1 point)

A job you collect on in 35 to 55 days is a job you financed for the customer. At a bank prime rate around 6.75% (Federal Reserve H.15) plus a small-business spread, the carry on that receivable is a real cost that never shows up on the job P&L. It is small per job and large across a year of open receivables.

Add the four leaks and a 45% bid margin lands near 24% in the bank.

How to rebuild your true margin from your own books

You do not need new software to check this. You need one job and four adjustments.

1. Start from the quoted gross margin on a representative recent job (say 45%).
2. Re-cost the labor. Take the field wage, multiply by 1.35 to 1.60 for burden (payroll taxes, workers comp, and benefits), then divide the day's cost across only the billable hours (roughly 61% of the paid day), not the clock hours. Recompute the job at that rate.
3. Add back callbacks. Multiply your callback rate (8 to 14% is the benchmark, use your own if you track it) by the average return-trip labor cost, and spread it across your jobs.
4. Subtract the AR carry. Take (average days to collect divided by 365) times your annual cost of capital (roughly 9 to 11% all-in) times the job's revenue.

The gap between the bid margin and the rebuilt margin is where the business quietly loses money on jobs that looked fine. This is the same phantom-margin problem that shows up when 91% of jobs have no cost data attached, and it traces back to the systems never reconciling, which is why your field platform and accounting never agree.

Why this is directional, and why that is fine

The 45-to-24 figure is an illustration of the mechanism, not a measured population statistic. The input costs (burden ranges, callback rates, wage anchors, prime rate) are sourced to named public data; the specific point-impact of each leak depends on your trade, mix, and discipline. The point is not the exact number. The point is that the gap is real, it is large, and it is invisible until you rebuild the job with fully loaded costs.

Related reading:

• Why you don't know your real job margin
• Why QuickBooks job costing is broken for contractors
• Gross profit per hour: the complete guide
• Callback cost calculator