If you run a construction company, you already know that keeping a job on time and on budget is tough. But here's something that surprises many contractors: you can finish a job on time, keep your crew busy all year long, and still run out of money. How does that happen? The answer almost always comes back to one thing — not properly tracking your Work in Progress, or WIP.
In this post, we're going to break down what WIP is, why it matters so much, and what happens to contractors who ignore it. We'll keep things simple, because this is one of those topics that's too important to get buried in accounting jargon.
What Is Work in Progress (WIP)?
Work in Progress is a financial snapshot of every open job your company is currently working on. Think of it like a health report for each project. It tells you three main things:
How much work you've actually done (what you've earned)
How much you've billed the customer (what you've invoiced)
Whether those two numbers are in balance
When you've billed more than you've earned, that's called overbilling. When you've earned more than you've billed, that's called underbilling. Both of these can cause real problems for your business if you're not watching them closely.
A WIP schedule — the document that tracks all of this — is updated regularly (ideally every month) and covers every open job at the same time. It's not complicated to understand, but it does require discipline to maintain.
Why Does WIP Tracking Matter So Much?
1. Your Profit Reports Can Lie to You
This is the big one. Many contractors look at their bank account or their profit-and-loss statement and think everything is fine. But those numbers can be misleading if your WIP isn't being tracked properly.
Here's a simple example. Say you land a $500,000 job. In the first month, you bill $200,000 but you've only completed about $100,000 worth of work. Your bank account looks great — but in reality, you've spent that extra $100,000 in advance. That money isn't profit. It's a liability. You still owe the customer $100,000 worth of work.
If you spend that money thinking it's profit, you're going to hit a wall later in the job when costs keep coming in but there's nothing left to bill. Contractors have gone out of business because of exactly this situation.
WIP tracking exposes this problem before it becomes a crisis. It shows you the difference between what you've billed and what you've earned, so you're never fooled by a healthy-looking bank account.
2. Overbilling Can Tank Your Reputation with Banks and Bonding Companies
Your banker and your surety (the company that provides your performance and payment bonds) look at your WIP schedule every time you need a loan or a new bond. They're not just looking at your revenue numbers — they're looking at your billing patterns.
If they see a lot of overbilling across your jobs, that's a red flag. It tells them you might be pulling money out of future work to cover today's costs. That's a sign of cash flow problems, even if your income statement looks fine. Banks and bonding companies can — and will — reduce your credit line or your bonding limit if your WIP looks bad.
On the other hand, if your WIP is clean and balanced, it shows them that you run a tight ship. That makes it easier to get the financing and bonds you need to take on bigger, more profitable work.
3. It Helps You Catch Failing Jobs Early
No contractor wants to think about a job going bad. But it happens — costs run over, materials get more expensive, a subcontractor causes delays. The sooner you catch these problems, the sooner you can take action.
A monthly WIP review lets you compare your estimated costs to complete against your actual costs so far. If the numbers aren't matching up, that's your early warning system. Maybe your labor costs are running higher than expected. Maybe a material supplier raised prices. Whatever the cause, seeing it early gives you time to adjust — whether that means having a conversation with the owner about a change order, cutting costs elsewhere, or just making sure you don't make the same mistake on the next bid.
Contractors who don't track WIP tend to find out a job is losing money right at the end — when it's too late to do anything about it.
4. It Gives You a True Picture of Company Health
A single job is easy to track in your head. But what about when you have 10 open jobs? Or 25? At that scale, it becomes impossible to know how your company is really doing without a WIP schedule.
Your WIP schedule rolls up every open job into one place. It shows you which jobs are profitable, which ones are struggling, and whether your overall company is in a strong financial position. It's the single most important financial document a contractor can have.
Lenders, CPAs, and sureties all say the same thing: a contractor who maintains a clean, accurate WIP schedule every month is a contractor they can trust. That trust translates directly into better loan terms, bigger bonding capacity, and a stronger business.
The Two Biggest WIP Mistakes Contractors Make
Mistake #1: Only Updating WIP at Year-End
Some contractors treat WIP like a tax document — something you hand to your accountant once a year. That's a mistake. By the time you find out a job is in trouble at year-end, it's usually too late to fix it.
Monthly WIP reviews are the standard in the construction industry for a reason. A lot can change on a job in 30 days. Material costs go up. Work slows down. A subcontractor falls behind. You need current information to make good decisions.
Mistake #2: Using Billings Instead of Earned Revenue
This is a subtle but important point. Some contractors report revenue based on what they've billed rather than what they've actually earned (based on how far along the job is). This approach — sometimes called the cash basis method — can make your income look higher or lower than it really is.
The correct approach, called the percentage-of-completion method, ties your revenue to how much work is actually done. Under this method, if a job is 40% complete, you recognize 40% of the total contract value as earned revenue — regardless of what you've billed. This gives you a much more accurate picture of where you really stand.
Most banks, sureties, and CPAs require percentage-of-completion reporting for any meaningful financial review. If you're not using it, you're likely making business decisions based on inaccurate numbers.
How to Build a Simple WIP Process
You don't need expensive software to start tracking WIP properly. Here's what you need at a minimum:
For each open job, track:
Original contract amount (and any approved change orders)
Total estimated cost to complete the job
Costs incurred to date
Billings to date
Calculated percent complete (costs to date ÷ total estimated costs)
Earned revenue (contract amount × percent complete)
Overbilled or underbilled amount (billings vs. earned revenue)
Once you have this information for every open job, you roll it all up into your WIP schedule. Most construction accounting software — like Sage, Viewpoint, or Foundation — can generate this report automatically if your job costs are entered correctly.
The key is consistency. Set a monthly close date, review every open job, and make sure your project managers are giving you accurate cost-to-complete estimates. That last part is critical — your WIP is only as good as the numbers going into it.
What Good WIP Management Looks Like in Practice
A contractor who manages WIP well typically does a few things consistently:
They meet with their project managers once a month to review costs and update cost-to-complete estimates for every open job. They review the WIP schedule with their CPA or CFO to make sure revenue is being recognized correctly. They share the WIP with their banker and bonding agent as part of their regular financial reporting. And they use the WIP as a feedback loop — if a job is overbilled, they slow down future billings. If a job is underbilled, they make sure to catch up on invoicing before too much time passes.
This kind of discipline separates contractors who grow steadily over time from those who always seem to be scrambling, even when they're busy.
The Bottom Line
Tracking WIP isn't just an accounting exercise. It's one of the most powerful tools you have for running a profitable, stable construction business. It tells you the truth about where each job stands, warns you about problems before they get out of hand, and gives your lenders and bonding company the confidence to support your growth.
If you're not reviewing a WIP schedule every month, the most important thing you can do right now is start. Work with a CPA who understands construction accounting, get your project managers trained on cost-to-complete reporting, and make WIP review a regular part of how you run your business.
The contractors who do this consistently tend to stay in business longer, grow bigger, and sleep better at night — and that's worth a lot.