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Contractor WIP Schedules and Surety Bonding: What Underwriters Look For
How sureties read a construction WIP schedule, how underbillings and overbillings work, and which level of CPA financial statements bonding may require.
When a contractor asks for a higher bonding limit, the surety wants to know one thing above all: can this company finance the work it has already started? Revenue and backlog do not answer that. The answer lives in the work-in-progress (WIP) schedule and the CPA-prepared financial statements behind it. This guide explains what sureties read in a WIP schedule, how underbillings and overbillings are calculated, and which level of CPA reporting your surety may ask for.
What sureties weigh
A profitable income statement and a full backlog are a starting point. Underwriters typically also look at:
- Working capital, liquidity and available credit
- Tangible net worth and debt
- Consistency of earnings over several years
- How current and reliable the financial reporting is
- Job cost controls and estimates to complete
- The size and risk of the backlog
- Management experience and track record
- Bonded work already outstanding
Each surety sets its own criteria by bond type, project and risk. There is no single threshold that applies everywhere.
What a WIP schedule shows
A WIP schedule is a job-by-job report that ties project data to the financial statements. Field names differ between contractors, but most schedules include:
| Group | Typical fields |
|---|---|
| Contract | Job number, customer, original contract, approved change orders, pending change orders shown separately, revised contract value |
| Cost | Costs to date, estimated cost to complete, estimated total cost |
| Progress and revenue | Percent complete where applicable, revenue earned to date |
| Billing | Billings to date, underbilling or overbilling |
| Profit | Estimated total gross profit, profit recognized to date, remaining profit or loss |
| Status | Expected completion date |
Consistent definitions, solid source records and one cutoff date for every job matter more than the exact layout.
Underbillings and overbillings
An underbilling means revenue earned to date is higher than billings. It can come from billing milestones lagging the work, change orders not yet billed, retainage or estimates that need updating. Large underbillings make sureties ask about cash conversion and collectability, but they are not automatically losses or a sign of poor management.
An overbilling means billings are ahead of earned revenue. It provides cash, but it also represents work still owed. Sureties check whether there is enough margin and cash left to finish jobs that have already been billed. Overbillings used to fund overhead rather than the project draw scrutiny.
Patterns matter more than any single figure. Modest underbillings from normal billing lag read very differently from repeated margin fade across several jobs or aggressive front-loaded billing.
A worked example
Using a cost-to-cost percentage of completion method, for illustration only:
| Item | Amount |
|---|---|
| Revised contract value | $2,000,000 |
| Costs to date | $900,000 |
| Estimated cost to complete | $900,000 |
| Estimated total cost | $1,800,000 |
| Estimated gross profit | $200,000 (10% margin) |
| Percent complete | $900,000 of $1,800,000, or 50% |
| Revenue earned to date | 50% of $2,000,000, or $1,000,000 |
If the contractor has billed $800,000, the job is underbilled by $200,000. If it has billed $1,200,000, it is overbilled by $200,000. The economics of the job are the same in both cases; only the billing position changes. Real calculations also account for retainage, eligible costs, change orders and the applicable accounting framework.
Margin fade and gain
Margin fade is a drop in expected profit as the job progresses, often from labor productivity problems, material price swings, subcontractor issues, delays, rework or disputed change orders. Margin gain is the reverse. Both show up only if estimates to complete are updated honestly every month, not guessed at year end.
WIP is only as good as job costing
Reliable WIP needs timely labor allocation, material and subcontractor costs accrued in the right period, equipment charges, tracked change orders and commitments, realistic remaining hours, and job cost reports reconciled to the general ledger at a consistent month-end cutoff. Missing accruals make jobs look more profitable than they are. An internal management report, a bookkeeping cleanup and a package prepared for a surety are three different levels of rigor.
Compilation, review or audit
| Engagement | Assurance | What the CPA does |
|---|---|---|
| Compilation (AR-C 80) | None | Helps management present the statements in an acceptable framework without testing balances or expressing a conclusion |
| Review (AR-C 90) | Limited | Performs inquiry and analytical procedures and reports whether any material changes appear needed |
| Audit | Reasonable | Performs audit procedures and gives an opinion on whether the statements are fairly presented |
Smaller programs may accept compiled statements; larger bond lines often call for a review, and some require an audit. A review does not test every job, and an audit gives reasonable rather than absolute assurance. Never call one engagement by another’s name. Our article on reviews, compilations and audits goes deeper.
How the WIP schedule itself is covered depends on the engagement terms and standards. Ask your surety and CPA whether the schedule must accompany the statements, whether the CPA reports on it as supplementary information, and whether a set format or date is required.
What a bonding package may contain
- Financial statements at the required level of service
- A WIP schedule reconciled to the books
- Prior-year comparisons and interim statements if requested
- Receivable and payable agings
- Backlog and contract schedule
- Debt, credit line and equipment details where requested
- Explanations for margin fade, loss jobs, disputes or large underbillings
- Owner or guarantor financial information if the surety asks
Before you ask for a higher limit
- Get the surety’s exact reporting requirements, reporting date and engagement level.
- Close the books and reconcile job cost records.
- Update every active job’s estimate to complete.
- Investigate large under or overbillings and margin changes.
- Reconcile the WIP schedule to the ledger and statements.
- Prepare supporting schedules and written explanations.
- Leave time for CPA procedures and adjustments.
- Submit and answer follow-up questions promptly.
Better financial information strengthens a submission, but no CPA can guarantee approval or a specific bond limit.
Common mistakes
- Updating WIP only at year end
- Stale estimates to complete and missing cost accruals
- Counting pending change orders as earned revenue
- Hiding margin fade or loss jobs
- Confusing billings with earned revenue
- A WIP total that does not tie to the ledger
- Submitting a lower level of CPA work than requested
- Starting the CPA work a week before a bid deadline
How CPA Torrance supports contractors
We help contractors build the records a surety relies on: bookkeeping and ledger reconciliation, job cost and WIP preparation support, review of estimates to complete and margin trends, and coordination with your surety on reporting requirements, subject to engagement acceptance and the services we offer. Contractors juggling several active jobs often add fractional CFO support for cash flow visibility. We do not claim surety partnerships or promise underwriting outcomes. Book a 15-minute call to talk about your reporting needs.
Frequently asked questions
What is a construction WIP schedule?
A job-by-job report of contract values, costs to date, estimated total costs, billings and earned revenue or profit.
Why do sureties care about it?
It shows billing discipline, job cost accuracy, margin trends and whether the contractor can finance work underway.
What is the difference between an underbilling and an overbilling?
An underbilling means earned revenue exceeds billings; an overbilling means billings exceed earned revenue.
Do I need audited statements for bonding?
Not always. The surety decides based on the bond program and your circumstances, so confirm with your bond producer.
What separates a compilation from a review?
A compilation gives no assurance. A review gives limited assurance through inquiry and analytical procedures.
This article is general information, not tax advice for your situation. Deadlines and rules can change; confirm with a tax professional before acting.
