Work-in-progress (WIP) accounting is one of the most important financial management tools in the construction industry. Because construction projects often span months or years, contractors cannot rely on simple point-in-time accounting to understand job performance. Instead, they need a reliable way to track progress, costs, revenue, billings, and projected profit throughout the life of each contract.
That is where WIP reporting comes in. A well-prepared WIP schedule helps contractors, project managers, lenders, sureties, and accounting teams evaluate the financial health of active jobs and identify problems early. It provides visibility into whether a project is on track, whether profit is holding, and whether the company is billing ahead of or behind the work performed.
For many long-term construction contracts, revenue is recognized over time under U.S. GAAP based on the guidance in ASC 606, Revenue from Contracts with Customers. One common way to measure progress toward completion is the cost-to-cost method, which compares costs incurred to date against total estimated costs. In practice, many contractors still refer to this framework as the percentage-of-completion method or “POC,” even though current financial statement presentation is governed by ASC 606.
Used correctly, WIP reporting is not just an accounting exercise. It is a risk management tool, a profitability monitoring tool, and a decision-making tool. For construction businesses trying to grow while protecting margins and cash flow, few reports matter more.
Revenue Recognition in Construction: Why WIP Matters
Construction accounting is different from accounting in many other industries because the billing cycle and the revenue recognition cycle are not always the same.
A contractor may invoice the customer according to a contract billing schedule, milestone schedule, or monthly pay application. But invoicing alone does not determine how much revenue has actually been earned for financial reporting purposes. Under many long-term contracts, revenue is recognized over time as performance obligations are satisfied.
That distinction is critical.
- Billings reflect what has been invoiced to the customer.
- Earned revenue reflects the value of work performed to date under the applicable revenue recognition method.
If a company confuses billings with earned revenue, the result can be distorted financial statements, misleading job profitability, and poor cash flow decisions.
WIP reporting bridges that gap by comparing project activity, incurred cost, estimated cost to complete, revenue earned, and amounts billed. In other words, the WIP schedule translates day-to-day project performance into useful financial insight.
The Core Mechanism: Measuring Progress Using Cost-to-Cost
For many construction companies, the most common way to measure progress on long-term contracts is the cost-to-cost method. This approach uses actual costs incurred to date as a percentage of total estimated costs.
The basic formula is:
Percentage Complete = Costs to Date ÷ Total Estimated Costs
Once the percentage complete is determined, earned revenue can be estimated by multiplying that percentage by the total contract price.
Earned Revenue = Percentage Complete × Contract Price
This approach sounds straightforward, but it depends heavily on the quality of the contractor’s estimating process. If the total estimated cost is unrealistic, every downstream number becomes less reliable.
That is why cost-to-complete estimates are so important. A WIP report is only as accurate as the assumptions behind it. If job forecasts are stale, overly optimistic, or not updated for change orders, labor issues, or material cost increases, the WIP schedule may create a false sense of profitability.
Key Components of a Construction WIP Report
A construction WIP report combines several financial and operational data points into one schedule. Each component matters because each one affects how management interprets the health of a job.
Contract Price
This is the total expected value of the contract, including approved change orders and any other amounts the company expects to earn under the agreement. If the contract value is incomplete or outdated, earned revenue calculations will also be wrong.
Estimated Total Cost
This is the current projection of what the project will cost from start to finish. It includes costs already incurred plus the estimated cost to complete the remaining work.
This number is often the most sensitive variable on the WIP schedule. Even small changes in the estimate can materially change percentage complete, earned revenue, and expected profit.
Costs to Date
These are the actual costs incurred on the project as of the reporting date. Depending on company policy and financial reporting practices, this may include direct job costs and certain allocable indirect costs.
Percentage Complete
This is the project’s progress measure based on costs incurred relative to total estimated costs.
Earned Revenue
This is the portion of contract revenue recognized based on the company’s progress toward completion. Under a cost-to-cost approach, it is calculated from the percentage complete.
Billings to Date
This is the cumulative amount invoiced to the customer as of the reporting date. Billings affect cash flow and customer collections, but they do not automatically equal earned revenue.
Estimated Gross Profit
This is the projected contract price minus total estimated cost. Changes in this amount over time can reveal improving or deteriorating job performance.
Overbillings vs. Underbillings
One of the most closely watched parts of any WIP schedule is the relationship between earned revenue and billings to date.
In construction practice, contractors commonly refer to this relationship as overbillings and underbillings. Under current GAAP, these positions may be presented in financial statements as contract liabilities and contract assets, depending on the facts and the company’s reporting.
Even though the industry still uses the older terminology every day, understanding both sets of language is important.
Overbillings
Overbillings occur when billings to date exceed earned revenue.
In practical terms, this means the contractor has invoiced the customer ahead of the revenue recognized on the job. In financial statement terms, that position is often associated with a contract liability.
Overbillings are not automatically bad. In fact, they can improve short-term cash flow and reduce working capital strain. But they can also create risk if the company spends that cash too aggressively. If later project costs rise or progress slows, the contractor may need to complete substantial work without comparable future billings coming in.
Underbillings
Underbillings occur when earned revenue exceeds billings to date.
In practical terms, this means the company has performed work that has not yet been fully billed. Depending on the facts and presentation, that position may be reflected as a contract asset or a similar unbilled position.
Underbillings are not always a red flag, but persistent underbillings deserve attention. They can indicate delayed billing, weak project administration, disputed work, unapproved change orders, or jobs where performance is outpacing the billing process. Any of those issues can create cash flow pressure.
Illustrative Scenario
Assume a project has:
- Contract Price: $1,000,000
- Estimated Total Costs: $800,000
- Costs to Date: $400,000
The calculations would be:
- Percentage Complete = $400,000 ÷ $800,000 = 50%
- Earned Revenue = 50% × $1,000,000 = $500,000
Now compare two billing scenarios:
| Scenario | Billings to Date | Earned Revenue | Over/Underbilling | Typical Interpretation |
| Overbilling | $600,000 | $500,000 | $100,000 | Billing ahead of earned revenue |
| Underbilling | $400,000 | $500,000 | ($100,000) | Earned revenue exceeds billing |
This simple example shows why the WIP report matters. Two jobs with the same physical progress can look very different from a cash flow and reporting standpoint depending on how they have been billed.
Profit Fade and Profit Gain
Another major value of WIP reporting is its ability to reveal changes in projected profitability.
Profit Fade
Profit fade happens when the estimated gross profit on a project decreases over time. This usually means one or more assumptions in the original job forecast were too optimistic or that circumstances changed during execution.
Common causes include:
- inaccurate estimating
- labor overruns
- productivity issues
- material price increases
- scope changes not reflected timely
- unapproved or poorly managed change orders
- unexpected site conditions
Profit fade is one of the most important warning signs in a contractor’s financial reporting. If management spots it early, the company may still be able to control costs, improve billing, renegotiate scope, or otherwise reduce the damage.
Profit Gain
Profit gain is the opposite. It means the estimated gross profit on the project has improved over time. This can happen when execution is more efficient than expected, labor performs well, costs are controlled effectively, or change orders are priced and approved favorably.
Neither profit fade nor profit gain should be ignored. Both tell management something important about estimating accuracy, operational performance, and forecasting discipline.
Step-by-Step WIP Accounting Example
To show how all of this works in practice, consider the following hypothetical project:
- Contract Price: $1,000,000
- Initial Estimated Total Cost: $800,000
- Initial Estimated Gross Profit: $200,000
Project Status at Month 3
| Metric | Value | Calculation |
| Costs to Date | $200,000 | Actual costs incurred |
| Revised Estimated Total Cost | $800,000 | No change |
| Percentage Complete | 25.00% | $200,000 ÷ $800,000 |
| Earned Revenue | $250,000 | 25.00% × $1,000,000 |
| Billings to Date | $300,000 | Amount invoiced |
| Over/(Under)billing | $50,000 | $300,000 – $250,000 |
| Current Estimated Gross Profit | $200,000 | $1,000,000 – $800,000 |
| Profit Fade/(Gain) | $0 | $200,000 – $200,000 |
At Month 3, the project is overbilled by $50,000. The contractor has billed ahead of earned revenue, and the projected gross profit remains unchanged.
Project Status at Month 6
Now assume that costs increase due to unforeseen conditions.
| Metric | Value | Calculation |
| Costs to Date | $500,000 | Actual costs incurred |
| Revised Estimated Total Cost | $850,000 | Updated forecast |
| Percentage Complete | 58.82% | $500,000 ÷ $850,000 |
| Earned Revenue | $588,235 | 58.82% × $1,000,000 |
| Billings to Date | $550,000 | Amount invoiced |
| Over/(Under)billing | ($38,235) | $550,000 – $588,235 |
| Current Estimated Gross Profit | $150,000 | $1,000,000 – $850,000 |
| Profit Fade/(Gain) | ($50,000) | $150,000 – $200,000 |
By Month 6, the estimated total cost has increased, reducing projected gross profit from $200,000 to $150,000. That $50,000 decline is profit fade. The project has also shifted from an overbilled position to an underbilled one, which means the contractor has now earned more revenue than it has billed.
This is exactly why regular WIP review matters. A contractor that only looks at billing activity may miss the fact that profitability is slipping and working capital is tightening at the same time.
Best Practices for Accurate WIP Reporting
A WIP schedule is only useful if the information behind it is current, complete, and consistent.
Update the WIP Schedule Regularly
For most contractors, monthly WIP reporting is the minimum practical standard. Waiting until year end to evaluate job performance is risky because cost overruns, profit fade, and billing issues can build for months before anyone addresses them.
Involve Both Operations and Accounting
Project managers usually know more about field conditions, scheduling problems, production issues, and change order status. Accounting teams usually have stronger visibility into job cost recording, billings, collections, and financial reporting. The best WIP schedules are built through collaboration between both groups.
Reconcile to the General Ledger
The WIP schedule should align with the company’s accounting records. If costs on the WIP do not reconcile to the General Ledger, management may be making decisions based on unreliable data.
Update Change Orders Promptly
Approved change orders should be reflected in contract values and cost forecasts as quickly as possible. Pending change orders may also need separate internal tracking so management understands where margin and cash flow risk exists.
Be Realistic About Cost to Complete
Optimism is one of the biggest threats to accurate WIP reporting. If estimators or project managers understate the cost to finish a job, percentage complete and earned profit can be overstated. Conservative and disciplined forecasting usually leads to better long-term decision-making.
Use Better Systems Where Possible
Manual spreadsheets are common, but they can create version-control issues, broken formulas, and delayed updates. Construction accounting software and integrated job costing systems can improve consistency, speed, and visibility.
Who Uses the WIP Report and Why
The WIP schedule matters to more than just the accounting department.
Owners and Executives
Leadership uses WIP reporting to monitor portfolio performance, evaluate risk exposure, understand projected profitability, and make staffing, financing, and growth decisions.
CFOs and Accounting Teams
Finance and accounting teams rely on WIP schedules to support revenue recognition, financial statement preparation, internal reporting, cash flow forecasting, and lender or surety conversations.
Project Managers
Project managers use WIP schedules to compare actual performance to estimates, identify cost overruns, manage billing position, and understand whether a project is helping or hurting the company.
Sureties and Bonding Companies
Sureties review WIP reporting to assess a contractor’s backlog quality, profitability, work-in-progress exposure, operational discipline, and overall financial strength.
Banks and Lenders
Lenders often look at WIP schedules when evaluating a contractor’s liquidity, financial stability, and borrowing capacity. A weak WIP can signal operational or cash flow problems even when topline revenue looks strong.
CPAs and Auditors
External accountants and auditors use WIP-related information to understand contract activity, test financial reporting positions, evaluate estimates, and assess whether reported revenue and balances are supportable under the applicable accounting framework.
Common WIP Accounting Mistakes to Avoid
Even experienced contractors can make WIP mistakes that distort their numbers.
Treating Billings as Revenue
This is one of the most common errors. Billing the customer does not automatically mean that revenue has been earned for financial reporting purposes.
Using Stale Cost Forecasts
A WIP schedule based on outdated estimated costs is misleading. The longer inaccurate estimates stay in the schedule, the more management decisions will drift away from reality.
Ignoring Change Orders
Unrecorded or poorly tracked change orders can distort both contract value and projected cost, making reported profitability unreliable.
Failing to Reconcile Job Cost Data
If project data in the WIP schedule does not tie back to the accounting system, the schedule may look polished while still being wrong.
Overlooking Persistent Underbillings or Overbillings
Either condition can be a warning sign. Chronic underbillings can strain cash flow. Chronic overbillings can mask future funding pressure if the remaining work is expensive.
Conclusion
WIP accounting is not just a back-office reporting exercise. In construction, it is one of the clearest windows into job performance, margin health, billing position, and financial risk.
A strong WIP schedule helps contractors understand whether work is progressing as expected, whether revenue recognition is reasonable, whether projected profit is holding, and whether the business is managing cash flow responsibly.
For many contractors, the day-to-day language of WIP still includes terms like percentage of completion, overbillings, and underbillings. But the broader financial reporting framework should be understood in the context of current accounting guidance, including ASC 606 and the related presentation of contract assets and contract liabilities where applicable.
When estimating is disciplined, forecasts are updated regularly, and operations and accounting stay aligned, WIP reporting becomes far more than a compliance task. It becomes a strategic tool for protecting profitability and supporting better decisions.
Frequently Asked Questions
What is a WIP schedule in construction?
A WIP schedule is a report that tracks job costs, estimated costs to complete, earned revenue, billings, and projected profit on active construction projects. It helps management understand the financial status of each job.
How do you calculate percentage complete?
A common method is the cost-to-cost approach: divide costs incurred to date by total estimated contract costs.
What is the difference between earned revenue and billings?
Earned revenue reflects the amount recognized based on progress toward completion under the applicable accounting method. Billings reflect the amount invoiced to the customer.
Are underbillings always bad?
Not necessarily. But repeated or growing underbillings may point to billing delays, disputed work, weak project administration, or unapproved change orders, all of which can pressure cash flow.
Why do sureties and lenders care about WIP reports?
They use WIP reporting to evaluate financial strength, project execution, profitability trends, and whether the contractor appears able to complete current and future work successfully.
