What Your WIP’s Warning Signs Actually Mean

Under billings, profit fade and missed change orders can all show up in the same WIP report, and at a glance they can look like variations of the same problem. They aren’t. Reading WIP report warning signs correctly means understanding what each one points at, because the fix for one can make another worse, and a construction company that treats them all the same can end up solving the wrong problem more often than not.

Over Billings and Under Billings Don’t Age the Same Way

Over billings and under billings behave differently over time, and that difference matters more than either number on its own. CFMA’s cash management guidance notes that over billings tend to turn into profit, while under billings tend to turn into margin fade and potential job losses. That doesn’t mean every under billing is a problem. Catching up on invoicing after a busy month, or billing slightly behind because paperwork lagged the field, is normal and usually corrects itself the following period. What matters is the trend across several months, not the number on any single WIP. A small under billing that shows up once is noise. The same under billing showing up and growing month after month is a pattern, and a pattern is worth investigating before it becomes something a bank or surety notices first. Sureties in particular tend to read a rising under billing as a sign that estimating discipline or billing practices need attention, regardless of how the contractor explains it.

A Growing Under Billing Rarely Means Just One Thing

A growing under billing can mean one of a few different things, and they call for different responses. Sometimes it really is a timing issue: work got done, billing lagged behind it, and the next invoice catches everything up. Sometimes it’s a loss that hasn’t been recognized yet, sitting unrecorded as an under billing because the estimated cost to complete hasn’t been corrected to reflect what’s happening on the job. And sometimes it’s profit fade in progress, a job bid at 15% margin sliding to 12%, then 10%, then 8%, invisible if the only person watching checks once a month.

Catching it early means treating jobs over 70% complete as their own category, worth a deep dive with the project manager and the controller or CFO rather than a glance at the schedule. That conversation should confirm whether the remaining costs to complete still match the work that’s left, and whether any additional work performed warrants a change order to recoup the cost. Once that’s settled, the estimated costs to complete and estimated billings get updated to reflect it, so the margin on the job reflects where it actually stands.

Getting these tracked at the level of individual construction contract accounting is what separates a company that catches profit fade early from one that discovers it at year end, when correcting the estimate means correcting the whole year’s financials at once.

A Red Flag Isn’t Always What It Looks Like

A red flag doesn’t always mean what it looks like it means, and that’s exactly why it deserves a closer look instead of an assumption. Take a job sitting at 96% complete with an over billing on the schedule, but only 3.3% gross profit. On the surface, that combination reads as a healthy, nearly finished project. Underneath it, that thin margin at that stage of completion is worth questioning before anyone accepts the over billing at face value. The projected total costs might be a little overstated, which would lower the percent complete and could eliminate the over billing entirely once corrected. Or retainage payable might not have been recorded yet, throwing off both sides of the schedule. CFMA’s WIP framework points to the same habit: look past what a single number appears to say and check it against what the job’s actual trajectory supports.

Change Orders Slip Through the Cracks Too

Change orders performed but never captured are the other classic way a WIP drifts away from reality. The process itself isn’t black and white. A verbal approval on the job site can turn into a disputed recollection weeks later. Paperwork sometimes gets started before anyone signs it because the schedule is tight and the documentation feels like it can wait. Email threads bury the actual scope and price under rounds of back and forth until nobody’s quite sure what was agreed to. Every one of those gaps eventually shows up as an under billing, because the work got done but never made it into the numbers that support billing for it. Bringing change order tracking into the same system that drives job costing closes that gap before it distorts the WIP. It also gives project managers one place to point to for what was approved and when, instead of a stack of emails nobody can reconstruct months later when a bank or surety starts asking questions.

Read Your WIP Report Warning Signs Before They Read You

WIP report warning signs only earn their keep when someone reads them for what they mean, rather than simply logging that they showed up. Under billings, profit fade and missed change orders each call for a different response. James Moore’s team helps construction companies build WIP reporting that catches these signals early. Contact us when you’re ready to make sense of what your WIP is telling you.

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