Every contractor knows the bid matters. But the number that can quietly do the most damage is not always the bid. It is the cost-to-complete — especially when nobody can explain it.
We have seen this happen too often in construction companies. A project starts with a strong expected margin. The early WIP reports look fine. The project manager feels good. The field team says the job is on track. But month by month, the projected margin starts to slip.
Not enough to cause panic. Not enough to trigger a serious conversation. Just enough to make the numbers feel a little less comfortable each time.
Then, instead of asking what changed in the field, someone adjusts the remaining cost so the job still looks reasonable on paper. The cost-to-complete becomes the number needed to make the report work.
That is not forecasting. That is plugging. And in construction, plugging the cost-to-complete can create a serious cash flow problem.
The Problem With a “Plugged” Cost-to-Complete
A cost-to-complete estimate should answer a simple question: What will it actually cost to finish this job?
That number should be based on real project conditions: remaining labor hours, subcontractor commitments, material needs, equipment usage, pending change orders, productivity trends, and known field issues.
But when cost-to-complete is not tied to real job data, it becomes a balancing figure. It gets adjusted to protect the margin instead of revealing what is really happening.
If a job is 60% complete but has already burned through 75% of its labor budget, the remaining labor budget should not be based on hope. It should be based on current production reality. If crews are producing slower than estimated, the forecast needs to reflect that. If materials are running higher than expected, the forecast needs to reflect that. If change orders have not been approved, the forecast needs to reflect that risk.
The WIP schedule is only useful if it tells the truth.
Margin Fade Usually Starts Quietly
Margin fade rarely shows up all at once. It usually starts with small signals:
- A labor code runs slightly over budget.
- A subcontractor change has not been approved yet.
- A project manager assumes productivity will improve next month.
- A cost code is closed out too early.
- A remaining budget is reduced because the report “doesn’t look right.”
Individually, these may not look like major problems. Together, they can hide the fact that the job is losing margin long before the loss becomes obvious.
By the time the problem hits the financial statements, the opportunity to fix it in the field may already be gone.
Profit on Paper Is Not the Same as Cash in the Bank
When the cost-to-complete is understated, the job may appear more profitable than it really is. That can lead to premature confidence, poor cash planning, and bad decisions about taking on new work.
It can also make the company appear better-billed than it really is.
To be clear, overbilling is not automatically a problem. In construction, overbilling can be normal and even healthy when it is tied to contract terms, billing strategy, mobilization, and actual project status.
The problem is unsupported overbilling.
If the cost-to-complete is understated, overbilling may create a false sense of cash strength. The cash may look good today, but it may not really be profit. It may be money that will be needed later to finish the job.
You are not ahead. You are borrowing from the end of the job.
Why Banks and Bonding Agents Care
Contractors sometimes think WIP reporting is just an internal accounting requirement. It is not.
Your WIP schedule tells lenders and bonding agents whether your company understands its jobs, its margins, and its risk. They are not only looking at whether a job shows profit. They are looking at whether the profit appears believable.
Consistent margin fade, unexplained cost-to-complete changes, large underbillings, unsupported overbillings, and weak job cost support all raise questions.
A bonding agent wants to know whether your backlog is real. A banker wants to know whether your cash flow is sustainable.
If your WIP depends on numbers that cannot be defended, your financial statements lose credibility. And when credibility slips, borrowing capacity and bonding capacity can quietly shrink.
Questions Every Contractor Should Ask About Cost-to-Complete
A strong cost-to-complete review does not need to be complicated, but it does need to be disciplined. Start with these questions:
- What work remains to be completed?
- What labor hours are still required?
- How does recent productivity compare to the original estimate?
- What committed costs are still open?
- What costs have been incurred but not yet invoiced?
- Are pending change orders included, excluded, or separately tracked?
- Are we assuming productivity improvement without evidence?
- Did the cost-to-complete change this month? If so, why?
- Who approved the change?
- Can the project manager explain the remaining cost by cost code?
The goal is not to beat up the project team. The goal is to protect the company before a field issue becomes a financial crisis.
The Fix: Turn Cost-to-Complete Into a Forecast, Not a Guess
A reliable WIP process should connect accounting, project management, and field reality.
That means contractors should:
- Review actual costs against budget regularly, not just at the end of the job.
- Track labor productivity by cost code.
- Update committed costs for subcontracts and purchase orders.
- Separate approved change orders from pending change orders.
- Require explanations for major cost-to-complete changes.
- Compare estimated gross profit from month to month.
- Review overbillings and underbillings for cash flow risk.
- Hold a monthly WIP meeting with accounting, operations, and leadership.
The best contractors do not wait until closeout to find out whether a job made money. They monitor the job while there is still time to make decisions.
The Bottom Line
A cost-to-complete number should never be what someone needs to be true. It should be what the company reasonably expects to spend to finish the job.
When that number becomes a plug, the contractor loses visibility. Margin fades quietly. Cash flow gets distorted. Banks and bonding agents lose confidence. Leadership starts making decisions based on reports that feel accurate but are not telling the full story.
The WIP schedule should not be a comfort document. It should be a truth-telling tool.
At J&S Moore Financial Group, we help construction companies strengthen job costing, WIP reporting, cash flow visibility, and financial decision-making so owners can stop guessing and start leading with numbers they can trust.
If your cost-to-complete numbers are changing each month and nobody can clearly explain why, it may be time for a deeper review.
Need a Second Set of Eyes on Your WIP?
If your cost-to-complete numbers are changing each month and no one can clearly explain why, your WIP may be telling you what everyone hopes is true — not what the job is actually going to cost.
Schedule a Construction Profit & Cash Flow Review and we’ll help you identify whether your job cost reports are showing real margin, hidden fade, cash flow risk, or cost-to-complete assumptions that need a closer look.
Stop guessing. Start leading with numbers that tell the truth.
