How does job costing work for a trades business, practically?
Job costing means tracking everything a job actually costs and comparing it to what you billed. Every project gets four categories of costs. Materials, labor, subcontractor payments, and a share of your overhead all get assigned to the job they belong to. When the job closes, you see the true margin, not what you hoped you’d make.
Materials go to jobs as you buy them. When you pick up supplies at the hardware store or have materials delivered to a site, that purchase gets coded to the specific job in your accounting software. Wait a week to record it and you’ll either forget which job it was for or code it wrong. Same-day entry is the habit that makes job costing work.
Labor requires time tracking at the job level. Your crew logs hours to each project, and those hours times their loaded cost become the labor cost for that job. Loaded cost includes wages plus employer taxes and benefits. This is where clean payroll matters. If your payroll data is messy, the labor costs you assign to jobs won’t be accurate, and the whole job cost calculation falls apart.
Subcontractor payments need the same treatment. When you pay a plumber or electrician to do work on a specific project, that payment gets assigned to that job. This connects directly to your 1099 process. If you’re not tracking sub payments properly with W-9s on file and payments recorded correctly, you can’t accurately cost your jobs or stay compliant at year end. Small business bookkeeping services that understand trades work are essential for getting this right.
Overhead is trickier. Truck payments, insurance, tools, office costs, and your own time don’t tie to a single job. Most contractors allocate overhead as a percentage of direct costs or as a flat daily rate per project. The method matters less than picking one and using it consistently so you can compare jobs fairly.
When the job is done, you compare what went into it against what you billed. A $12,000 remodel might have $3,500 in materials, $4,000 in labor, $1,800 to subs, and $900 in overhead. That leaves $1,800 in gross margin, or 15%. Now you have a real number you can evaluate.
The payoff shows up on the next bid. Instead of guessing at materials and labor based on feel, you pull up similar past jobs and see what they actually cost. Your estimates start from data. That makes pricing decisions defensible and your margins predictable over time.
The machinery underneath job costing has to be clean for any of this to work. Crew payroll with accurate time tracking and subcontractor payments with proper documentation need to be right before job-level costs can be meaningful. ClearLedgers® works with home and field service businesses to build that foundation and set up job costing that produces real numbers. If you’re ready to know what your jobs actually make, book a consultation and let’s talk through what your business needs.
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