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Retainage, work in progress (WIP), and percentage of completion describe different parts of construction accounting: contract payment terms, project status, and how revenue is recognized. In U.S. financial reporting, revenue follows the contractor’s performance under the contract—not simply the amount billed or collected. A WIP schedule helps compare progress and estimated job economics with billings, while retainage classification depends on the contractor’s right to payment. Federal tax accounting is a separate analysis and may produce different timing.
What do retainage, WIP, and percentage of completion mean?
These terms are related, but they are not interchangeable. Retainage is consideration withheld under a construction contract, often from progress billings until a milestone such as completion or acceptance. A contractor may also withhold retainage from amounts otherwise payable to subcontractors. The contract explains why money is held back and when it may become payable.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWork in progress (WIP) is a way to organize information about jobs that are still underway. A WIP schedule typically brings together a contract’s value, estimated total project cost, cost incurred to date, and requisitions or billings to date. Comparing those figures helps a contractor assess earned revenue and the remaining work and cost expected on each job. AICPA & CIMA describes WIP schedules as tools for calculating earned revenue at a reporting date and understanding what remains on a project (AICPA & CIMA’s WIP schedule overview).
Percentage of completion is common shorthand for measuring progress on a performance obligation that qualifies for revenue recognition over time. It is not a method that automatically applies to every construction contract. First, the accounting analysis must establish that the contractor satisfies the relevant performance obligation over time. Then the contractor selects an input or output measure that faithfully depicts the transfer of performance to the customer.
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In short: retainage is about payment terms; a WIP schedule is a project-level reporting tool; and a progress measure is used to recognize revenue when the accounting requirements are met. Keeping those distinctions clear helps prevent billing schedules and cash receipts from being mistaken for measures of performance.
How does a contractor decide whether revenue is recognized over time?
Under ASC 606, revenue is recognized as or when performance obligations are satisfied. For construction work, the contractor must evaluate the contract and applicable criteria before concluding that the obligation is satisfied over time. The job’s label, the length of the contract, or the fact that progress billings are submitted does not by itself settle that question.
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Where the obligation qualifies for over-time recognition, the contractor chooses how to measure progress. An input measure tracks resources or effort used, such as eligible costs, labor hours, time, or machine hours. An output measure tracks results delivered, such as units completed, milestones, or appraised results. Neither type is automatically best for every project. The selected measure should depict the performance transferred to the customer, use observable and reliable information where possible, and be applied consistently to similar obligations in similar circumstances.
For a cost-to-cost input measure, the contractor generally compares eligible costs incurred to date with the latest estimate of total eligible costs for the performance obligation. The calculation is only meaningful if the costs included relate to performance transferred. Costs that do not depict progress can distort the apparent percentage complete, so the contractor must assess the contract circumstances and cost composition rather than divide two totals without review.
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Estimates are not frozen when a job begins. At each reporting date, the contractor should reconsider progress, remaining costs, and other relevant estimates. If expected total costs rise, the cost-to-cost percentage can fall even though the contractor has incurred more cost and performed additional work. That is a reason to review the project forecast and accounting together—not to treat the prior estimate or prior billing as conclusive.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteHow does a WIP schedule connect costs, billings, and earned revenue?
A WIP schedule places job-level estimates and activity side by side so that the contractor can see how a job stands at a particular reporting date. A useful schedule commonly includes contract price, estimated total project cost, costs incurred to date, and requisitions or billings to date. The exact layout should fit the company’s accounting system and reporting framework, but the figures must be understandable and consistently prepared.
Under a simplified cost-based illustration, AICPA & CIMA describes a project with a $1 million budget and $250,000 of costs incurred as 25% complete. In that illustration, the contractor records 25% of revenue and gross profit at that point. It is an example of a cost-based premise, not a universal ASC 606 formula: the contractor still needs to establish that revenue is recognized over time, select an appropriate measure, assess which costs depict transferred performance, and update the estimates.
For example, suppose the reporting process indicates that the contractor has earned $300,000 of revenue on a job but has requisitioned $240,000 to date. The difference is a useful signal that earned performance and billing have not kept pace with each other. It does not mean the contractor has collected $300,000 in cash. Nor does it, without reviewing the payment conditions and contract, establish by itself which balance-sheet category applies. The schedule helps identify the difference; the contract and accounting analysis explain its presentation.
The AICPA & CIMA article quotes Rob Mercado, CPA, CCIFP, managing director at CBIZ: “The work-in-progress schedule allows us to calculate at that moment how much revenue was earned through that date.” Mercado also emphasizes the separation between requisition and revenue: “Requisition doesn’t mean anything. It’s just a cashflow mechanism. When a contractor requisitions for money, that’s not revenue. They have to incur costs to create revenue.” Those statements underscore why a progress payment request cannot stand in for the accounting analysis of performance (AICPA & CIMA’s discussion of WIP schedules).
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A schedule is most useful when its estimates and actual costs are current enough to support reporting and project oversight. It can prompt questions about whether a cost-to-complete forecast is still realistic, whether billing is tracking the contract’s payment terms, and whether the job’s earned revenue is ahead of or behind its billings. It is not a substitute for the underlying ledger, contract documents, or professional judgment.
Why don’t progress billings and revenue necessarily match?
Billing and revenue answer different questions. A requisition or progress billing requests payment according to the contract’s billing terms. Revenue reflects performance under the applicable accounting framework. Payment milestones may be set for cash-flow or administrative reasons and need not occur at the same time or in the same amounts as the transfer of performance.
When the recognized revenue and amounts billed differ, the contractor analyzes the resulting position under ASC 606. If the contractor has performed and recognized revenue but its right to consideration remains conditional on something other than the passage of time, the amount may be part of the contract asset analysis. If the customer has been billed and the contractor has an unconditional right to payment, that amount is generally a receivable. If billing or payment precedes the related performance, the contract liability analysis may apply. These categories depend on the facts and rights in the contract, not merely on whether a balance is informally called “underbilled” or “overbilled.”
In practice, the contractor should not collapse every difference into one net account without considering its nature. The FASB staff paper explains that contract assets and contract liabilities are presented net by contract, while unconditional receivables are presented separately. It also discusses disclosure when receivables include billed but unpaid retainage. Its guidance is explanatory: the paper states that it “does not change or modify current GAAP” and is not a comprehensive assessment of retainage accounting. Use it as an educational explanation, not as a substitute for current authoritative accounting guidance (FASB staff’s educational paper on retainage presentation and disclosure).
How is retainage classified under U.S. GAAP?
The word “retainage” does not determine whether an amount is a receivable or a contract asset. The central question is whether the contractor has an unconditional right to payment. If the customer’s payment obligation is unconditional and only the passage of time remains before payment is due, the balance is a receivable. If payment remains conditional on something else—such as a contractual completion or acceptance condition—the amount belongs in the contract asset or contract liability analysis as appropriate.
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Consider two contracts that both call a withheld amount “retainage.” Under one, retainage has been billed, the contractor has an unconditional right to payment, and the contract merely delays the due date. Under another, payment is not yet due unless the contractor completes a specified milestone or satisfies an acceptance condition. The labels match, but the payment rights may differ. The contractor should read the contract and assess the precise condition instead of classifying the balance based on the holdback label alone.
The same care applies to retainage a contractor withholds from a subcontractor. That is a payable-side contract matter, not the same balance as retainage held by the customer. The IRS’s construction industry guide discusses retainage in federal tax contexts as well as amounts withheld in construction arrangements; it does not make the payment terms irrelevant to financial statement classification (IRS Construction Industry Audit Technique Guide).
Because retainage can remain unpaid for a meaningful period, contractors should be able to explain what is billed, what is still conditional, what event releases the holdback, and whether the right to payment has become unconditional. The FASB staff paper addresses presentation and disclosure questions specifically for construction retainage. It cautions that its illustrations do not create requirements and that official FASB positions follow due process, so practitioners should verify the applicable accounting guidance for the reporting facts.
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Does federal tax accounting follow the book WIP schedule?
No. A WIP schedule prepared for financial reporting does not automatically determine taxable income. U.S. GAAP reporting and federal income tax accounting have different purposes and rules; tax treatment can depend on the contract category, accounting method, elections, and cost-allocation requirements. The IRS construction guide discusses methods and retainage timing, and it notes that tax cost allocation can differ from GAAP, including for uninstalled materials.
That distinction matters when a company uses a book cost-to-cost schedule. The cost set used to depict performance for financial reporting does not necessarily settle which costs count, or when they count, for a tax computation. Similarly, the treatment and timing of retainage for tax purposes depend on the taxpayer’s method and facts. A contractor should not copy a book WIP figure into a tax return calculation without applying the federal tax rules relevant to that contract and taxpayer.
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The IRS guide describes a particular federal tax completed-contract completion test involving the earlier of (1) 95% of contract costs incurred together with the customer’s intended use, or (2) final completion and acceptance. That specific test is not an ASC 606 threshold, nor is it a universal rule for every contractor or every tax situation. It should be read only in the tax context and scope described by the IRS guide; current Internal Revenue Code provisions and regulations should be checked for a real filing.
For a contractor working across book and tax reporting, a practical discipline is to keep the assumptions traceable: document the book measure and estimates, separately identify the tax method and relevant elections, and reconcile differences rather than forcing both systems into one calculation. A construction accountant or tax professional can assess the contract and filing facts when the treatment affects a return or financial statements.
What should a contractor review at each reporting date?
A disciplined close helps keep WIP, revenue, and retainage analysis aligned without confusing them. At a reporting date, review the following for each significant job:
- Contract terms and scope: Confirm the contract value and performance obligations being reported. Identify relevant changes to the job’s scope or payment conditions before relying on old assumptions.
- Over-time eligibility: Reassess whether the applicable ASC 606 criteria support recognizing the obligation over time. Do not infer eligibility from the existence of progress billings.
- Progress measure: Confirm that the selected input or output measure still faithfully depicts performance transferred. Check that the costs or outputs included relate to that performance and that similar obligations in similar circumstances use the measure consistently.
- Estimate to complete: Update estimated total costs and other inputs using current project information. A changed estimate can change the reported progress and earned revenue even when cash or billing activity has not changed.
- Billings and requisitions: Compare amounts billed with revenue recognized, but treat the comparison as a way to identify differences—not as proof of earned revenue.
- Retainage rights: For each held amount, identify whether it is billed and whether the right to payment is unconditional or still depends on a substantive condition. Separate customer-held amounts from retainage withheld from subcontractors.
- Book-to-tax differences: Keep the financial reporting calculation distinct from the federal tax calculation and retain support for the applicable method, elections, and cost treatment.
These checks make a WIP schedule more than a list of balances: it becomes a structured way to explain a job’s reported progress, expected remaining economics, and the timing difference between earned performance and billing. The schedule is only as dependable as the contract interpretation, cost data, and estimates behind it.
Frequently Asked Questions
What does “underbilled” mean on a construction WIP report?
It is common industry shorthand for a job where recognized revenue exceeds billings to date. The label describes a comparison, not a complete GAAP classification; payment conditions still determine whether the balance is a receivable or part of the contract asset analysis.
What does “overbilled” mean on a construction WIP report?
It commonly describes billings that are ahead of revenue recognized to date. The difference is not automatically profit or evidence of a problem: it should be interpreted alongside the contract’s billing terms, remaining performance, and balance-sheet presentation.
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Can a WIP schedule change after a job’s progress has been reported?
Yes. Updated job costs or revised estimates of total project cost can change the calculated progress and revenue picture at a later reporting date. That is why the schedule should be supported by current estimates rather than treated as a permanent statement of a job’s final economics.
