An 8% gross margin one quarter and 39% the next isn’t good news to celebrate. It’s a sign that nobody can tell you what your real number is.
We saw that exact range recently while reviewing the books for an energy-services company. The crews were busy, the work was getting done, and revenue was coming in. But when gross profit moves that far from one period to the next, management can’t use it to price the next job, decide which work to chase, or tell whether the business is actually improving.
Whether the problem is inconsistent job costing, pricing, or accounting timing, financial consulting can help you get a clearer picture of where your business is actually making money.
What Does a Swing From 8% to 39% Gross Margin Tell You?
In a project-based business, some movement in margin is normal. A large job wraps up, the season changes, or a slow month spreads overhead across less work.
A swing this wide is different. It rarely means the business got dramatically better or worse. It’s more likely that the number itself isn’t reliable. If you can’t explain why one quarter came in at 8% and the next at 39%, you can’t tell which one reflects how the business really performs, so neither number helps you decide anything.
That uncertainty can cost you, turning project profitability into a guess and calling into question every pricing, hiring, and bidding decision.
What Usually Causes Big Gross Margin Swings?
When we see margins move this much, there are three usual suspects. Often it’s more than one.
An Accounting Timing Issue
Revenue and the costs that produced it land in different periods. A job gets invoiced in March, but the subcontractor bills and materials hit the books in April. Or work-in-progress adjustments aren’t made monthly, so costs sit on the balance sheet and get released all at once. One period looks great, the next looks terrible, and the jobs themselves performed about the same.
Inconsistent Pricing
Similar jobs get quoted differently, depending on who built the estimate, how busy the team was, or how hard the customer pushed. Without a consistent basis for labor rates, equipment, mobilization, and overhead, two jobs that look alike on paper can carry very different margins.
Job or Product Mix Shifting
Different service lines carry different margins. When the mix of work changes from month to month, the blended gross margin moves with it, even when every individual job performs exactly as expected. This one isn’t a problem on its own, as long as your reporting shows margin by service line so you can see it happening.
How Do You Find Out Which One Is Driving Your Margin?
Start with the accounting timing issue because it’s the easiest to rule out and it distorts everything else. Check whether revenue and costs for each job are recorded in the same period, whether work-in-progress is adjusted every month, and whether costs are coded to the right jobs.
Once timing is clean, look at margin by job and by service line. If margins still vary widely on similar work, pricing is the likely cause. If margins hold steady within each service line but the overall number keeps moving, it’s mix.
Pinning down which one it is should meaningfully stabilize margins because each cause has a different fix.
How Do You Tighten the Loop Between Estimating, Job Costing, and Post-Job Reviews?
In most project-based businesses, estimating, job costing, and post-job reviews happen in separate places, if the reviews happen at all. The fix is to connect them so each one informs the next.
Estimating
Build every bid from the same written assumptions: labor rates, equipment, mobilization, travel, and overhead. When those assumptions are documented, job costing has something concrete to compare against.
Job Costing
Track actual costs against the estimate, coded to the right job and phase, in the period they’re incurred. Good job costing shows you where a job is drifting while there’s still time to act on it, not after the invoice goes out.
Post-Job “Stand Downs”
A stand down is a short, structured review after each job wraps up. Compare the estimate to the actual result, identify what drove any difference, and decide what changes in the next bid. Anyone in energy services knows the term from safety. The same discipline works just as well for the numbers.
What comes out of each stand down feeds straight back into estimating. That’s what closes the loop.
What Does Stabilized Gross Margin Look Like?
Stabilized doesn’t mean flat. Margins will still move with the season, the mix of work, and the occasional difficult job.
But having a stabilized gross margin means you can explain every movement. Margin on similar work falls within a predictable range, estimates and actuals get closer over time, and you can forecast next quarter’s margin with reasonable confidence.
How long that takes depends on how long your jobs run and how much cleanup the books need first. You need several closed periods of clean data and enough completed jobs through a stand down before the pattern can be trusted. For most project-based businesses, that’s a matter of quarters, not weeks.
Why Does Project Profitability Matter Beyond the Income Statement?
A reliable margin changes more than your monthly report. It tells you which jobs to bid and at what price, which customers are worth growing, and where your crews create the most value.
It also matters to the people outside the business. Lenders, sureties, and future buyers all look at margin trends, and unexplained swings are one of the first things they question.
FAQs About Project Profitability
What is the difference between gross profit and gross margin?
Gross profit is the dollar amount left after subtracting the direct costs of delivering the work from revenue. Gross margin is that same figure expressed as a percentage of revenue, which makes it easier to compare jobs, periods, and service lines of different sizes.
What is a good gross margin for an energy-services company?
It varies widely by service line, contract type, and region, so there isn’t one right number. Your own history by service line is usually the most useful benchmark, and consistency matters as much as the level itself.
How often should job costing be reviewed?
Active jobs should be reviewed at least monthly as part of the close, so cost overruns show up while there’s still time to act. Each job should also get a final review once it’s complete, comparing the estimate to the actual result.
Should overhead be included in job costs?
Direct costs such as field labor, materials, subcontractors, and equipment belong in job costs. Some companies also allocate indirect field costs to jobs. Either approach can work, but the allocation needs to be consistent and trued up regularly, or it will distort margins on its own.
How can a WIP schedule affect gross margin?
A work-in-progress schedule matches revenue to the costs incurred on each job. If it isn’t updated monthly, revenue can be recognized ahead of or behind the related costs, which pushes margin up in one period and down in the next.
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Janine Smith is a Consulting CFO with TGG. She has a wealth of experience in accounting process development and management, supervising both TGG staff and client’s internal staff (banking, AR, AP, inventory management, payroll), and working with many different types of accounting software. She has worked with clients to develop KPIs that fit their current needs and coached them to support the goals of the business. One of her favorite tasks is budget development and using that as a tool to help organizations meet their goals.