The WIP Schedule a Buyer Actually Trusts

Short answer

A work in progress schedule is the most important document in a construction company's financial package, because revenue, gross margin, and cash timing are all decided there before they reach the income statement. Buyers, sureties, and lenders read the WIP schedule first. Unexplained margin movement between periods costs a contractor more credibility than a slow quarter ever will.

Most contractors treat the WIP schedule as something the CPA assembles at year end. Treated that way, it is a compliance document. Treated as a monthly management report, it is the single best early-warning system a construction business has.

What a WIP schedule is and what it produces

A work in progress schedule is a job-by-job report that shows, for every open contract, the contract value, costs incurred to date, estimated costs to complete, percent complete, revenue earned to date, and the amount billed to date, with the difference between earned and billed carried to the balance sheet as an over or under billing.

Most contractors carrying bonding report on a percentage of completion basis, because a surety expects revenue recognized as the work is performed rather than as invoices go out. That means the WIP schedule is not a report about your financial statements. It produces them. Earned revenue on the schedule becomes revenue on the income statement, and the billing position on the schedule becomes an asset or a liability on the balance sheet.

The practical consequence is that an error in a cost-to-complete estimate is not an estimating error. It is a financial reporting error, and it flows straight through to reported profit.

Over and under billings are what a reviewer reads first

Billing position tells a reader whether a contractor is being financed by its customers or is financing them, and it is the first thing an experienced reader looks at.

An overbilling, shown as billings in excess of costs and estimated earnings, means you have invoiced ahead of the work performed. The cash is in your account and the work is not done. A company running heavily overbilled across its portfolio is being funded by its customers, and that funding reverses as those jobs finish.

An underbilling, shown as costs and estimated earnings in excess of billings, means you have performed work you have not invoiced. You are funding the customer, and the reader will ask whether that is contract structure or a billing process that cannot keep up.

Neither position is wrong on its own. What matters is the trend across periods and whether you can name the reason for a specific job's position. A contractor who can say "job 412 is underbilled because a change order is pending approval and we do not bill unapproved work" is describing a control. A contractor who cannot explain why a job is underbilled is describing an unknown.

The number to watch is the swing. A portfolio that flips from meaningfully overbilled to meaningfully underbilled between quarters is telling a story about either estimating or billing discipline, and a reviewer will want to know which.

Margin fade is the number that decides your credibility

Margin fade is the decline in a job's gross margin between the estimate at contract signing and the actual result at completion, and any serious buyer will calculate it across your completed job history whether or not you have calculated it yourself.

Fade is the direct test of your estimating system. A contractor whose completed jobs finish close to their estimated margins has a system that works, and a reader will believe the margins on the jobs still open. A contractor whose jobs routinely finish below estimate has an estimating problem, and the consequence is that nobody believes the margin sitting in the open WIP either. That second effect is the expensive one, because it discounts work you have not finished yet.

The Fade Test

Pull your last twenty completed jobs. For each one, record the gross margin estimated at contract signing and the gross margin actually achieved at completion. Then write down two numbers: the average difference and the spread between the best and worst outcomes.

That is the Fade Test, and the point of it is ownership. Those two numbers are going to exist in a buyer's model regardless. Producing them yourself, with a note on the outliers, turns a finding into a disclosure. It also tells you something useful in its own right, because the spread usually matters more than the average. A contractor who averages a small fade with a wide spread has an estimating process that works on some job types and not others, which is a fixable problem once it is visible.

Run it annually and keep the history. Two years of Fade Test results showing the spread narrowing is one of the strongest financial exhibits a construction business can hand somebody.

What a single estimate revision does to reported profit

A change in estimated cost to complete moves percent complete, which moves earned revenue, which moves reported gross profit on the job, all in the period the estimate changes.

Here is the arithmetic, with every figure assumed purely for illustration. Assume a contract worth $2,400,000. Assume costs incurred to date of $1,200,000 and an original estimated total cost of $2,000,000, which makes the job 60 percent complete. Earned revenue is therefore $1,440,000 and gross profit recognized to date is $240,000. Assume you have billed $1,700,000, so the job is overbilled by $260,000.

Now assume the field revises estimated total cost to $2,200,000. Percent complete falls to roughly 54.5 percent. Earned revenue falls to about $1,309,000, gross profit recognized to date falls to about $109,000, and the overbilling grows to about $391,000. Nothing changed in the field except the estimate, and reported gross profit on that job dropped by roughly $131,000 in a single month.

That is why cost-to-complete estimates belong in a monthly review with the project managers rather than in a year-end true-up. A contractor who updates estimates monthly reports small, explainable movements. A contractor who updates them once a year reports one large one, in the month nobody wants a surprise.

Retainage is a receivable with a timeline attached

Retainage is the portion of each progress billing a customer withholds until the work is accepted, and it belongs on the balance sheet tracked separately from trade receivables because it is not collectible on normal terms.

The questions a reviewer asks about retainage are consistent: how much is outstanding, on which jobs, how old is it, and what conditions release it. Retainage sitting against jobs that closed a long time ago is the flag, because it usually means either a dispute nobody documented or a collection process that stopped at substantial completion.

The reporting requirement follows from the questions. Retainage receivable and retainage payable tracked in their own accounts, aged by job, with the release condition noted. A contractor who can produce that schedule in one report is answering a question. A contractor who has retainage buried inside trade receivables is going to spend a week rebuilding it, and the rebuild will surface something.

What your monthly close has to produce

A construction close is not finished when the bank account reconciles. It is finished when the WIP schedule ties to the general ledger.

Four ties do the work. Contract value on the schedule to signed contracts plus approved change orders. Costs incurred to date to the job cost detail in the general ledger. Over and under billings to the balance sheet accounts that carry them. Earned revenue on the schedule to revenue on the income statement.

Change orders deserve their own rule, because unapproved change orders inside a contract value are the most common way a WIP schedule quietly becomes fiction. Only approved change orders should adjust contract value. Pending ones get tracked on a separate schedule and disclosed as pending. That discipline costs you some reported revenue in the short term and buys you a schedule somebody can rely on, which is worth more.

None of this requires construction-specific software you do not already have. It requires the close to include the WIP schedule as a deliverable rather than as something assembled when the surety asks.

Where to start if you are eighteen months out

Three moves, in order of what they cost you.

Run the Fade Test this month on your last twenty completed jobs. It costs an afternoon and it tells you whether your estimating is the problem or the estimating is fine and the reporting cadence is the problem.

Then move the WIP schedule into the monthly close, with cost-to-complete estimates reviewed with the project managers before the books close rather than after. This is the change that produces small explainable movements instead of large annual ones.

Then clean up the balance sheet presentation: retainage in its own accounts and aged, over and under billings tied out, pending change orders on their own schedule. That is the version a buyer, a surety, and a lender can all read without asking you a follow-up question.

The transaction side of a construction sale, meaning what buyers pay for and how a contractor gets taken to market, is covered by our M&A colleagues in how to sell a construction business at Texas Exit Advisors.

Where Thryve fits

Thryve Accounting & Advisory works with contractors on the close that makes all of the above routine: a WIP schedule produced monthly and tied to the general ledger, cost-to-complete estimates reviewed on a schedule, retainage aged in its own accounts, change order discipline that keeps contract value honest, and job-level margin reporting that gives you the Fade Test as a by-product rather than as a project.

Contractors who run this way find out about a bad job in month three, when something can still be done about it. Contractors who do not find out at completion, which is also when their financial statements find out.

If your WIP schedule is something your CPA assembles once a year, that is the gap, and closing it improves how you run the business well before it improves how the business sells.

Last reviewed: September 2026. This article is general information, not legal, tax, or accounting advice specific to your business. Contract accounting practices, reporting bases, and retainage terms vary by contract, state, surety, and circumstance, and the reporting basis you use for financial statements may differ from other reporting you are required to file. All dollar figures above are illustrations built on assumptions stated in the sentences that carry them. Talk to your own CPA about how any of this applies to you.