Overbilling vs. Underbilling: What Your WIP Is Telling You
Over and underbillings aren't just accounting adjustments. They're signals about cash, billing discipline, and jobs that are quietly losing money.
BF
BuildFlash Finance Team · 6 min read
Every job on your WIP is either overbilled, underbilled, or right on. Each tells a different story about cash and risk.
Side by side
| Overbilling | Underbilling | |
|---|---|---|
| Meaning | Billed more than earned | Earned more than billed |
| Balance sheet | Liability | Asset |
| Cash effect | Cash ahead of the work | Work ahead of the cash |
| Common causes | Front-loaded SOV, mobilization billing | Missed billings, unapproved change orders, overruns |
| Surety view | Fine in moderation | Often discounted |
What to do about each
For underbillings, check whether a pay app is late, a change order is stuck, or costs are running over estimate. For overbillings, make sure the cash is reserved for the remaining work, not spent on overhead.