The costs that most often drain contractor profit are the ones never tied to a job: labor burden (payroll taxes, workers' comp, benefits), callbacks and warranty rework, small tools and consumables, fuel and vehicle costs, disposal and dump fees, permits, equipment rental, card processing fees, and change orders that were done but never billed. Each one is small on a single job and significant across a year.
Most contractors know their big costs: materials, crew wages and subcontractors. Margin usually disappears somewhere else, in costs that are real but never show up on the job they belong to. When those costs sit in general overhead, every job looks more profitable than it was, and pricing stays too low.
1. Labor burden
A technician's hourly wage isn't the cost of that hour. Employer payroll taxes, workers' compensation insurance, benefits and paid time off all add to it. If job costing uses wages only, labor on every job is understated. Many contractors price from the wage and wonder why profitable-looking jobs don't add up to a profitable year.
2. Callbacks and warranty work
Return trips to fix or finish work cost labor, fuel and sometimes materials, and they generate no new revenue. If callbacks are recorded as general expenses, they're invisible. Tracking them against the original job (or at least as their own category) shows which job types, crews or suppliers are causing them.
3. Small tools and consumables
Blades, bits, fasteners, caulk, tape, safety gear and replacement hand tools are bought constantly and rarely coded to a job. Individually trivial, together they can be a meaningful share of job cost.
4. Fuel and vehicle costs
Fuel, maintenance, insurance and vehicle payments are a direct cost of getting crews to the work. For service companies with many short jobs, drive time and fuel can be a large part of the cost of each ticket.
5. Disposal and dump fees
Debris hauling, dumpster rental and dump fees are often paid on a company card and recorded to a general account. For roofing, remodeling, restoration and junk removal, disposal can be one of the largest costs on the job.
6. Permits and inspections
Permit fees, inspection fees and re-inspection fees belong to the job. When they're coded to overhead, jobs look cheaper to deliver than they are, and failed re-inspections disappear from view.
7. Equipment rental and idle equipment
Rented equipment kept longer than needed, or owned equipment sitting unused while still being financed and insured, is a real cost. Rental charges should be coded to the job; owned equipment costs need a deliberate way of being recovered through pricing.
8. Card processing fees
Customer card payments carry processing fees. If revenue is recorded net of fees, or fees land in a general bank-charges account, the cost of accepting cards on each job is hidden.
9. Change orders done but never billed
Extra work agreed on site and never written up is pure margin loss: the labor and materials are spent and the revenue never arrives. Reviewing change orders against invoices at job closeout catches them while they can still be billed.
10. Subcontractor paperwork gaps
Keep current certificates of insurance on file for every subcontractor. Depending on your policy, uninsured subs can add cost at your insurance audit, which arrives months after the job is finished. Your insurance agent can tell you how your policy handles this.
Why these stay hidden
None of these costs are unusual. They stay hidden because they're recorded without a job, split inconsistently, or lumped into overhead. The fix is structural (a chart of accounts and job setup that give each cost a place) and ongoing (someone reviewing job cost coding every month).
How Bookkeepers Lane helps
We set up job costing in QuickBooks Online so labor, materials, subcontractors, equipment and job-specific costs are tied to the job that incurred them, and review job cost coding as part of every monthly close. The result is job gross profit you can trust, and pricing decisions based on what the work really costs.
Want to see what this looks like for your business?
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