Job costing is the single most important financial practice for a contracting business — and the one most commonly skipped. Most contractors know their total annual revenue and rough profit, but they don’t know which specific jobs made money, which lost money, or why. Job costing gives you that answer: for every project you complete, you know exactly what it cost, what you charged, and what you actually made. This guide explains what job costing is, how to set it up in QuickBooks, and how it transforms your business.
What Is Job Costing?
Job costing is the process of tracking all revenue and costs associated with a specific project — from the first dollar of labor to the last material purchase — and comparing the total cost to the revenue generated to determine that project’s profitability. It’s essentially running a mini P&L for each individual job. The result tells you your gross margin (profit after direct costs) for every project you complete. Over time, job cost data accumulates into a powerful dataset showing you your average margin by project type, client type, location, or crew — giving you the data to make smarter bids, smarter hiring decisions, and smarter business strategy.
Why Most Contractors Don’t Job Cost
Despite being fundamental, most small contractors don’t do proper job costing. The reasons are consistent: it requires discipline to assign every expense to a specific job; it requires the right QuickBooks setup; and nobody ever showed them how to do it. Many contractors also resist job costing because they’re afraid of what they’ll find — that some of their most “successful” jobs were actually money-losers. That fear is understandable. But not knowing doesn’t make the problem go away. It just means you keep making the same pricing mistakes with no data to guide improvement.
What to Track in Job Costing
For each project, job costing should track: direct labor (hours worked by each crew member and their loaded labor rate), materials (every purchase assigned to the project — lumber, pipe, wire, fixtures, whatever is specific to this job), subcontractors (every invoice from subs working on this job), equipment rental, permit fees and inspection costs, any disposal or cleanup costs specific to the job, and the revenue billed to the client (progress invoices and final invoice). Revenue minus all of these costs equals the job’s gross profit. Gross profit divided by revenue equals gross margin percentage.
Setting Up Job Costing in QuickBooks Online
In QuickBooks Online (Plus or Contractor plan), job costing is handled through the Projects feature. To activate it: go to Settings > Account and Settings > Advanced > Projects, and turn it on. Then for each new job, create a Project (give it a name that identifies the job — client name + job type + year works well). When you create invoices, bills, expenses, or time entries, assign them to the appropriate Project. QuickBooks automatically calculates the total revenue, total costs, and profit for each project and shows it on the Project Profitability report.
The Project Profitability Report: Your Most Valuable Report
The Project Profitability report in QuickBooks shows all active and completed projects with total income, total costs broken out by cost type (labor, materials, subcontractors, other), and gross profit and gross margin percentage for each. Run this report monthly. Sort by margin percentage. The data will tell you which job types consistently produce your best margins, which are chronically underperforming, whether labor or materials are the primary driver of overruns, and how your estimates compare to actuals over time. This is your most important business intelligence as a contractor.
Using Job Cost Data to Improve Your Bids
After 6–12 months of job costing, you have real data for every project type you work on. Use it to refine your estimates: compare your estimated labor hours to actual labor hours for similar jobs — if you consistently underestimate labor, adjust your estimate template upward. Compare estimated material costs to actual — if materials consistently run over, build in a higher contingency. Identify which job types have the best margins and focus your marketing and sales effort on winning more of them. Identify which have poor margins and either raise your prices or stop pursuing that work type. Data-driven bidding is the competitive advantage that separates contractors who grow profitably from those who just grow busier.
Frequently Asked Questions
Can I do job costing without QuickBooks?
Yes, but it’s significantly harder. A dedicated spreadsheet can track job costs, but it requires manual entry of every transaction and produces no integration with your invoicing or bill payment workflow. Other platforms like Xero and FreshBooks have some project tracking, but QuickBooks Online’s Projects feature is the most complete and integrated solution for contractor job costing. The time investment in setting up QuickBooks correctly pays for itself many times over.
How long does it take to see meaningful job costing data?
After completing 10–15 jobs with full cost tracking, you’ll start to see patterns. After 6 months, you have enough data for reliable bidding benchmarks. After 12 months, you have seasonal patterns, year-over-year comparisons, and a comprehensive dataset that fundamentally improves your bidding accuracy and business strategy.
For more information, see our guide on bookkeeping for general contractors managing multiple jobs.
For more information, see our guide on setting up job costing in QuickBooks.
For more information, see our guide on how to price your services profitably.
For more information, see our guide on cash flow management on projects.
Bookkeeping Champs Sets Up Job Costing That Works
Bookkeeping Champs sets up QuickBooks job costing for contractors throughout Los Angeles, Ventura County, and the San Fernando Valley — including proper Chart of Accounts, Projects activation, and training on how to use the data to improve your margins. Call (818) 679-4451 today.
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