A lot of contractors finish a job, collect the check, and assume they made money because there’s cash in the account. But revenue is not profit. The only way to know if a job was actually profitable is to track every cost tied to that project and subtract it from what you collected. If you’re not doing that at the job level, you’re guessing.

Start with direct costs. Every hour of labor on that job, every material purchase, every subcontractor invoice, every equipment rental, every permit fee. These all need to be coded to the specific project, not lumped into general expenses. When costs sit in a general bucket, you have no idea which jobs are making money and which ones are eating your margin.

The biggest blind spot for most contractors is their own time. If you spent three weeks on a job and didn’t account for your labor, the job looks way more profitable than it actually was. Put a dollar amount on your hours. If you’d have to pay someone $45 an hour to do what you did, that cost belongs on the job.

Then there’s overhead. Your truck payment, insurance, tool replacement, phone bill, office costs, and bookkeeping fees don’t disappear just because they’re not tied to one specific job. A portion of those expenses needs to be allocated across your active projects. A simple way to do this is to calculate your total monthly overhead and divide it proportionally based on job revenue or labor hours. Skip this step and every job looks more profitable on paper than it really is.

Compare your actual costs to the original estimate. You bid the job at $18,000 expecting $6,000 in materials and $4,000 in labor. If materials came in at $7,200 because of a design change and labor ran $5,500 because the job took longer than planned, your margin just shrunk significantly. You need to see that gap in real time, not three months later when you’re wondering where the money went.

Change orders deserve their own tracking. Additional work the client requested is new scope with a new budget. Don’t mix it into the original numbers or you’ll never know whether you estimated the base job correctly.

All of this requires construction job costing set up properly in your accounting system. QuickBooks Online can handle it when configured with projects, cost categories, and the right chart of accounts. The tool isn’t complicated, but it does require discipline. Every receipt, every timesheet, every sub invoice needs to be coded to the right job as it happens.

The contractors who track profitability by job make better decisions. They learn which types of work carry the best margins. They spot problem jobs early enough to course correct. They stop underbidding because their estimates are built from real historical data instead of gut feelings. If you need help getting this kind of visibility into your numbers, our virtual bookkeeping services in Florida are built for exactly this. Knowing your true profit per job changes how you run the business.