Pop Quiz: What's Your WIP Schedule Telling You About Your Projects Right Now?

If you're not sure, keep reading.

"WIP schedule" is a term most construction business owners have heard, usually from an accountant or a lender, but far fewer could explain what it actually means or why it matters to their bottom line. WIP stands for Work in Progress. It's used to calculate the costs and revenue for your active projects based on percentage complete and not simply what's been spent or what clients have paid so far.

That distinction matters more than it might seem. Under U.S. GAAP, certain construction contracts require revenue to be recognized over time when the applicable criteria are met. This means a contractor needs a systematic way to measure progress toward completion. WIP reporting may be necessary to properly account for these construction contracts under the applicable revenue recognition rules.

During the building phase, the expenses you've incurred are not always ones you're allowed to expense immediately, and the payments you've collected from clients do not always represent revenue you've actually earned. A WIP schedule helps reconcile that gap by providing a clearer picture of a project's true financial position at any point in time. It shows how much has been earned, what has been spent, what remains to be spent, and whether the project is still expected to be profitable.

Here's everything you need to know.

Why WIP Matters to a Construction Business

A WIP schedule gives you information about what's happening with your active projects, such as how much has been spent, how much is remaining, and how much money is tied up in the work. Ideally, your gross income and net profit each month should reflect what's actually happening on your jobs. If WIP isn't being calculated accurately, the numbers on your books may not tell the true story of how your projects are performing. The biggest benefit is having that understanding while the project is still active, not after it's already finished.

Track Every Dollar Spent

None of this works without good data. Costs need to be tracked by project so you can see what's been spent and what's remaining. Without that level of detail, it becomes much harder to understand where a project stands financially or to calculate WIP accurately. Every project has its own costs and its own contract price, therefore the details matter.

Why WIP Needs to Be Completed Every Month

Projects change every month. Costs are incurred, work gets completed, and the amount remaining to spend can shift. Calculating WIP monthly, rather than only at project close, gives you a way to keep up with those changes and catch shifts in profitability or cash flow while there's still time to act on them.

Change Orders Can Change Your WIP Calculation

When a client adds work or makes additional selections, the total contract price increases. That needs to be reflected in your WIP calculation. If the contract price isn't updated, your percentage-complete calculation can be significantly off. Keeping the contract price current, even something as simple as updating it quarterly for change orders and selection overages, can make a tremendous difference in how a project is reflected financially.

What Is Cost to Complete?

Knowing what you've spent on a project isn't enough. You also need to know what's left to spend. For example, if you've spent $500,000 so far but still expect to spend another $300,000 to finish the job, that remaining cost is a critical part of the picture. Cost to complete helps you understand what a project will require financially before the work wraps up, and it's a key input for gauging future cash flow and profitability.

How WIP Helps You Understand Cash Flow

The financial position of an active project can shift as work progresses. For example, a job that looked fine a few months ago may require more cash than expected. Accurate, up-to-date WIP helps you see those changes coming instead of relying only on what's currently sitting in the bank.

Underbilling and Overbilling

Comparing a project's actual progress and costs against what's been billed tells you where you stand. If the work has progressed further than what's been billed, you may have an underbilling situation. If you've billed ahead of the work completed, that's overbilling. Neither should be looked at in isolation. You need to understand how billing compares to actual progress. This is one more reason to process WIP every month, while projects are still active.

What Happens When Profit Margins Start Slipping

Profit margins can change as a project moves forward. A few examples include, costs may run higher than expected, the amount remaining to spend can shift, and change orders can alter the contract price. Processing WIP regularly, rather than waiting until a project is finished, lets you catch it when a margin starts slipping while there's still a project to manage and adjust.

What Accurate WIP Can Tell You About Your Business

Put it all together, and accurate WIP can tell you a lot: true profitability, how much has been spent to date, how much remains, your cost to complete, and your future cash flow. It can flag underbilling or overbilling and show you when a profit margin is starting to slip. But the information going in has to be accurate. Costs tracked by project, contract prices to include new change orders and selections, and the WIP calculation must be updated every month.

That's the real value of WIP. It's not just another report. It's information you can use to understand your projects and make better decisions.

Track every dollar spent. Track it by project. Process your WIP every month.