Underbilling is hiding the loss
Underbilling looks like a timing problem. Often it's a job that has gone over, and nobody has said so yet.
A WIP schedule compares cost incurred to cost to complete. When you've spent more than you've billed, either you're behind on billing or the job is losing money. Those are two very different problems, and they look identical until someone runs the schedule.
Three moves, in order
Step 07: Monthly cadence
Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month.
Other problems step 07 solves
Other things that go wrong
What owners ask
Underbilling construction WIP?
Underbilling looks like a timing problem. Often it's a job that has gone over, and nobody has said so yet. A WIP schedule compares cost incurred to cost to complete. When you've spent more than you've billed, either you're behind on billing or the job is losing money. Those are two very different problems, and they look identical until someone runs the schedule.
Which part of the system fixes this?
The step is number 07, monthly cadence. Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month. It's drawn from chapter 7 of CONTROL: The Construction Financial Operating System.
Is this normal for my trade?
Across the 48 trades in the benchmark reference, net profit at $1M–$5M averages 7% before taxes. If you're well under that and this page describes your month, the two are usually the same story. The published average tells you where the pack sits, and your own job costing tells you where you sit, which is the number that pays payroll.
Where do I start?
Run a WIP schedule monthly, and get the cost to complete from the person running the job.
Can I fix this without touching anything else?
You can try, and it doesn't hold. Step 07 depends on step 03, overhead calculation and step 04, estimating system and step 05, software and bookkeeping alignment and step 06, project management. Install it ahead of those and it produces numbers nobody trusts, which is worse than the problem you started with.
Josh Luebker ran commercial construction projects before he ran the numbers behind them, on data centres, military bases, hospitals, and high-rises. He wrote CONTROL: The Construction Financial Operating System, which is an eight-step framework for commercial subcontractors, and it publishes on October 1, 2026. He is a master electrician who moved into the office and kept the field vocabulary.
Sulphur Prairie Operations LLC maintains the benchmark reference behind these figures. Every edition is reconciled against the newest CFMA survey release before it publishes here. Where a figure changes between editions, the older edition keeps its year in the title so a citation to it stays correct.