You’ve probably handed a banker or bonding agent a report you didn’t fully understand, or worse, been asked for one you didn’t have. That report is almost always a WIP schedule, and getting WIP schedule construction accounting right is the difference between running your business on gut feel and running it on real numbers. A WIP schedule tells you whether each active job is heading toward the margin you bid or quietly slipping away from it, and if nobody has ever walked you through one properly, this is that explanation.
The mechanics are the same for contractors everywhere, from residential builders in California to commercial contractors in the Southeast, and so is the pain when the numbers don’t add up. The financial reporting behind a good WIP schedule is what makes the rest fall into place.
What You’ll Learn
- How a WIP schedule shows whether each active job is tracking toward a profit or a loss before it closes
- What overbilling and underbilling mean, and why both create problems with lenders and sureties
- How the percentage-of-completion method drives WIP reporting and shapes what your financial statements show
- Why surety underwriters rely on your WIP schedule, and how a clean one can support your bonding capacity
- Why most contractors without a WIP schedule are bidding and managing cash on instinct, even though the numbers already exist in their job data
What Is a WIP Schedule, Really?
A WIP (work-in-progress) schedule is a financial report that tracks each active construction job by comparing the revenue earned to date with the costs incurred and the percentage of work completed. In plain terms, it tells you whether the job you’re running right now is making money, before you find out at close-out.
A WIP schedule is the financial tool that tells a construction business owner whether a job is profitable while there’s still time to do something about it.
Most contractors receive a P&L once a month and assume that’s the whole picture, but it isn’t. A P&L tells you what happened across the whole business, while a WIP schedule tells you what’s happening on each individual job right now.
How Do You Read a WIP Schedule Without an Accounting Degree?
At its simplest, a work-in-progress schedule is a table where each row is a job and the columns tell that job’s story:
| Column | What It Tells You |
|---|---|
| Contract value | The total agreed price of the job, including approved change orders |
| Costs incurred to date | What you’ve actually spent on the job so far |
| Estimated cost at completion | Your best estimate of what the whole job will cost when it’s finished |
| Percentage complete | Costs incurred divided by estimated total cost |
| Earned revenue | Contract value multiplied by percentage complete |
| Billed to date | What you’ve actually invoiced the owner |
| Over- or underbilling | The gap between earned revenue and billed to date |
Here’s how it plays out on a real job. Say you bid a $500,000 commercial tenant improvement and estimated total costs of $400,000, expecting $100,000 in margin. Three months in, you’ve spent $240,000, which means you’re 60 percent complete by cost, so your earned revenue is $300,000. If you’ve only invoiced $250,000, you’re underbilled by $50,000, and if you’ve invoiced $340,000, you’re overbilled by $40,000.
That single row tells you more about the health of the job than any P&L ever will.
What Do Overbilling and Underbilling Actually Mean?
This is where most contractors get tripped up, and it’s where construction job cost tracking either earns its keep or exposes what’s been missing.
Overbilling isn’t a cash flow advantage. It’s a liability on your balance sheet, and it raises a red flag for every lender and surety underwriter who reviews your financials.
Overbilling means you’ve invoiced the owner for more than the share of work actually completed. It feels like free money because the cash is in the bank, but it isn’t, because that money is owed back to the job in the form of work you still have to perform.
Underbilling is the opposite problem. You’ve done the work but haven’t invoiced for it yet, so cash you’ve already earned is sitting on the table.
Both create trouble:
- Overbilling ties up cash you’ll need to finish the work.
- Underbilling ties up cash you’ve already earned.
- Lenders read persistent overbilling as a sign of weak billing discipline.
- Sureties read either extreme as a sign that job costs aren’t under control.
Why Do Your Surety and Your Banker Care About Your WIP?
Your bonding capacity isn’t just about your balance sheet. It’s about whether the underwriter believes you can finish the work you already have, and the WIP schedule is how they check. The Surety & Fidelity Association of America explains that sureties are assessing whether a contractor has the capability and financial strength to complete a project, and a clean WIP schedule tells the underwriter three important things:
- Your job costs are being tracked as the work happens.
- Your billing lines up with the work actually completed.
- You know what your backlog is worth in real dollars rather than bid dollars.
When any of those signals is missing, bonding capacity gets restricted, and the same goes for your lender. A line of credit tied to your receivables looks very different when the underlying WIP shows overbilling and underbilling patterns that suggest you’re running the business on cash timing rather than actual job performance. That’s why cash flow management and accurate WIP reporting directly affect the terms you’re offered.
What Happens When a Contractor Has No WIP Schedule?
The consequences of running without one aren’t theoretical. They show up as:
- Jobs that close $40,000 short with no clear explanation of where the margin went
- Bonding limits that don’t reflect what your business could actually handle
- Change orders that were performed but never billed, quietly eroding the margin you bid
- Cash flow that feels unpredictable even when your backlog looks strong
- Bids priced on instinct because the real cost data isn’t available in time
- A banker asking a question at renewal that you can’t answer without going back to your bookkeeper
The pattern is nearly always the same. The contractor is working hard, winning good work, and running crews well, while the financial side stays a black box until something goes wrong.
What Is the Percentage-of-Completion Method?
The percentage-of-completion method recognizes revenue and costs on long-term construction contracts as the work progresses, rather than waiting until the project is finished.
The percentage-of-completion approach is the engine behind every credible WIP schedule. Without it, your financial statements don’t reflect the true position of your active projects.
Under US GAAP, this falls under the revenue standard, ASC 606, which recognizes revenue over time on most construction contracts, usually measured by comparing costs incurred to date with total estimated costs. It’s the approach your CPA follows when preparing reviewed or audited financial statements for your surety or bank.
Tax reporting has its own rules. Under Internal Revenue Code Section 460, most long-term construction contracts must use the percentage-of-completion method for tax purposes, with exceptions for smaller contractors that fall under the inflation-adjusted average gross receipts test and for home construction contracts. The One Big Beautiful Bill Act broadened that exception to cover more residential construction contracts entered into in tax years beginning after July 4, 2025, so if you build residential projects, it’s worth a conversation with your tax CPA.
You don’t need to memorize the code sections. The point is that this isn’t optional accounting theory. It’s how your financials are supposed to be built.
How Do You Get Your WIP in Order Without Doing It Yourself?
A proper WIP process needs three things: accurate job cost data flowing in as the work happens, someone who knows how to structure the schedule correctly, and a monthly close that produces the report on a predictable cycle.
Most contractors don’t have all three. A part-time bookkeeper can enter transactions, and a CPA can prepare year-end statements, but the gap between them, the monthly WIP that actually tells you what’s happening on your jobs, is where an outsourced accounting partner who understands construction earns their keep.
Picture a contractor whose WIP schedule has been prepared only once a year for the bonding renewal. When it’s rebuilt monthly, the owner discovers that two jobs have been heavily overbilled for months, which made cash look healthier than it really was, while a third job is underbilled because a large change order was never invoiced. Fixing the billing on all three evens out cash flow, and at the next renewal the surety gets a WIP schedule that’s consistent with the financial statements instead of one that raises new questions.
Key Takeaways
- A WIP schedule tells you whether a job is profitable while you can still act on it.
- Overbilling is a liability rather than free cash, and lenders know how to read it.
- The percentage-of-completion method drives what your financial statements actually show.
- A clean, consistent WIP schedule supports your bonding capacity and banking terms.
- Getting WIP schedule construction accounting right is a financial leadership function, not just a bookkeeping task.
Questions Contractors Ask About WIP Schedules
What is a WIP schedule in construction?
A WIP schedule is a financial report that tracks each active construction job by comparing the revenue earned to date with the costs incurred and the percentage of work completed. It shows whether each job is trending toward the margin you bid, or away from it, before the job closes.
Why does my surety keep asking for a WIP schedule?
Surety underwriters use the WIP schedule to judge whether your business is financially strong enough to complete the work you have in progress. A clean, consistent schedule shows that your job costs are under control and your billing matches the work completed, which directly affects how much bonding capacity you qualify for.
What is the difference between overbilling and underbilling on a construction job?
Overbilling means you’ve invoiced the owner for more than the share of work actually completed, while underbilling means you’ve invoiced less. Overbilling creates a liability on your balance sheet, underbilling ties up cash you’ve earned but not yet invoiced, and lenders and sureties treat persistent patterns of either as a sign of weak financial management.
Can my bookkeeper prepare a WIP schedule?
A general bookkeeper can enter job cost data, but producing a meaningful WIP schedule requires an understanding of construction accounting, including percentage of completion, job cost allocation, change order tracking, and retention billing. A bookkeeper without construction experience usually won’t know how to structure or interpret one correctly.
How often should a construction company update its WIP schedule?
At a minimum, your WIP schedule should be updated monthly as part of your financial close. Companies with large active contracts or frequent bonding and banking reviews benefit from an even tighter cycle, because it gives a more current picture of job performance.
Ready to Know What Your Jobs Are Actually Doing?
If you’re running jobs without a WIP schedule you trust, you’re making decisions on incomplete information. Book a free 30-minute discovery call with Michelle to talk through where your current reporting stands and what a proper WIP process would look like for your business. There’s no pitch, just a conversation.
About the author: Michelle Ahrens is the founder of Hugh Ledger Accounting. She has more than 27 years of accounting and finance experience, including over 20 years preparing WIP schedules, job cost reports, and financial packages for construction companies, their sureties, and their lenders.
This article is provided for informational and educational purposes only and does not constitute formal tax, legal, or accounting advice. Please consult a qualified professional regarding your specific situation.