Your bonding agent has scheduled the annual renewal meeting, and you have 60 to 90 days. Before you hand over the package, your surety underwriter will read your WIP report the same way they read every other one: by running five diagnostic tests on the schedule, in roughly the same order, looking for the same five patterns. Most contractors find out they failed one of those tests in the meeting — when the underwriter asks a question they don't have a clean answer for.
This post is how to read a WIP report the way the underwriter will, so you run those five tests yourself first. For each one you get what to look at, the pass/fail threshold, what a failure signals to the surety, and how to correct it before the package leaves your desk. The broader reason this matters more in 2026 is in what a hardening surety market means for your WIP; the short version is that underwriters now want interim, job-level transparency and have "less patience for repeated 'one-time' explanations in WIP schedules" (TSIB, 2026 Surety & Construction Forecast). A schedule that needs a phone call to explain costs you capacity. Run these tests first.
What is the surety underwriter actually doing when they read your WIP?
A surety underwriter reads your WIP to answer four questions: are your jobs profitable, are you billing accurately, are you overextended, and are your cost estimates reliable? Every diagnostic test below maps to one of those four questions. When the WIP answers all four cleanly, the underwriter gains confidence. As Grit Insurance Group puts it, "a clean, accurate, current WIP gives the surety confidence… That confidence translates directly into higher bonding limits and faster approvals" (Grit Insurance Group).
The WIP is the framing on top of the financial-statement foundation — the surety reads it "to understand what is actually happening in your business right now, not six months ago when your fiscal year ended" (Projul), and your available capacity is read straight off it. The five tests are not a formal scoring system; they are the four questions a surety answers when they open your WIP translated into things you can check on your own screen. If you need the foundation first (what each column is and how the schedule is built), start with what a WIP schedule is; this post assumes you already maintain one and walks the audit.
The five-test diagnostic checklist
The surety underwriter does not run these as a checklist with a score at the bottom. They are simply the five patterns that reliably trigger a follow-up question, a request for backup, or a disallowance. Running them yourself before the meeting tells you which ones you'll have to explain, and whether your explanation is strong enough to hold up under a skeptical read. The goal is not to pass an audit you administer to yourself; it's to know, before the underwriter does, where your WIP is going to draw a question. A WIP that needs a verbal caveat to explain a growing underbilling is a WIP that costs you capacity, because the 2026 underwriter has run out of patience for the same one-time explanation three quarters running (TSIB). Here are the five, in the order an underwriter tends to work through them.
Test 1: Are your ETCs current? (Date-freshness check)
Pass/fail in one line: any estimate to complete (ETC) that hasn't moved across two consecutive WIP periods on a job still incurring costs is stale, and a stale ETC tells the underwriter your percent-complete math can't be trusted.
What to look at. Check the date each project manager last updated their ETC, their estimate of the cost remaining to finish the job. In a Procore-based WIP, that timestamp lives on the cost-to-complete submission. If you don't track a submission date, look instead at whether the ETC dollar figures are actually changing period over period across your last three WIP snapshots. A number that never moves on an active job is the tell.
The threshold. An ETC unchanged across two consecutive monthly WIPs on a job that has incurred new costs in that window is stale. The opposite failure matters too: an ETC that keeps climbing on the same job. As one bonding guide puts it, "if your estimated costs to complete keeps climbing on the same project, your original estimate was wrong and you are chasing the number. That destroys credibility" (Projul).
What a failure signals. The surety underwriter reads a stale ETC as a reason the whole WIP-to-GL comparison is suspect. Either nobody is re-forecasting, or the PM doesn't want to update because the number has gotten worse. Either way, the percent-complete and earned-revenue figures built on that ETC are now in doubt.
How to correct it. Push every PM to re-submit their ETC before the package goes to the surety, and bring the dated, attributed submissions to the meeting. (For the mechanics of collecting those numbers monthly, the ETC collection step is its own walkthrough. This audit assumes the collection already happened.)
Test 2: Is your margin moving in the right direction? (Gain/fade trend)
Pass/fail in one line: a single period of fade is explainable, but a job whose estimated gross profit has declined for three consecutive WIP periods is a near-automatic follow-up question from the underwriter.
What to look at. For each active job, compute the gain or fade in estimated gross profit: original estimated gross profit (contract value minus original estimated cost at completion) against current estimated gross profit (contract value minus current EAC). Then line this period's estimated margin up against the prior two or three periods. You want flat or improving. You do not want a staircase heading down.
The threshold. One period of fade has a story. Margin declining across three consecutive WIP periods on the same job is the pattern. Three consecutive periods is a practitioner rule of thumb here, not a published surety standard. A job that keeps fading usually means it is in worse shape than the numbers show, because project managers tend to be optimistic about what it will take to finish. The surety reads the pattern, not the explanation. Northstar Financial Advisory is blunt about the stakes: "chronic profit fade is one of the strongest negative signals a surety can see on your financial statements, and it is often the primary reason bonding capacity is denied or reduced" (Northstar Financial Advisory). If your completed-jobs history shows the same pattern (finishing below bid margin again and again), the underwriter stops trusting your estimating across the board.
What a failure signals. Chronic fade reads as poor estimating, field overruns the office hasn't caught, or a job the PM hasn't been straight about. And the 2026 market has "less patience for repeated 'one-time' explanations in WIP schedules" (TSIB). "This one job was unusual" no longer survives being said three quarters in a row.
How to correct it. For any job on a three-period slide, attach a written explanation to the WIP (the change order in dispute, the subcontractor default, the scope you absorbed) rather than letting the underwriter find the trend and ask. If you want the mechanics of how fade is calculated and what it does to the income statement, that's covered in profit fade in construction.
Test 3: Are your late-stage underbillings collectable? (Underbilling aging)
Pass/fail in one line: any job that is 90% complete or more carrying an underbilling that has grown or held flat since the prior period is a disallowance candidate, and a disallowed underbilling cuts your adjusted working capital dollar-for-dollar.
What to look at. Filter your WIP to jobs at 90% complete or higher by the percent-complete column. For each, read the underbilling balance, the costs-and-earnings-in-excess-of-billings figure. A late-stage underbilling is the one the surety interrogates hardest, because the window to bill and collect it is closing.
The threshold. A 90%+-complete job whose underbilling has grown or held flat since the prior WIP is the pattern. The clearest published example comes from a surety underwriter directly: in an Old Republic Surety analysis, one contractor's project "97% complete at year-end — carried $296,000 in underbillings. Six months later, with the project 99% complete, underbillings had grown to $419,000, despite ongoing losses. This trend indicated a low likelihood of collection, leading to the disallowance of these amounts from the contractor's WC calculation" (Mahki Abner, Associate Underwriter, Old Republic Surety Company, in the NASBP Pipeline, June 24, 2025). Across that file, underbillings had inflated the contractor's working capital by nearly $3 million.
What a failure signals. If the surety underwriter believes a late-stage underbilling won't convert to cash, they disallow it from your adjusted working capital. An uncollectible underbilling overstates your working capital by exactly its dollar amount. And because adjusted working capital drives the bonding multiple, the disallowance shrinks your capacity at that same 10×–20× multiple.
How to correct it. Bill the work, or document precisely why you can't yet (the unapproved change order, the disputed scope, the pending owner sign-off) and show a credible collection path. If the underbilling truly isn't collectable, the surety will find it; better that you've already written it down. The over/under billing mechanics explain why a late-stage underbilling is so much more dangerous than an early one.
Test 4: Does your WIP match your books? (WIP-to-GL reconciliation)
Pass/fail in one line: the WIP must tie to the general ledger; as a working rule of thumb, treat any reconciliation gap larger than about 1% of total contract revenue as a credibility flag. A disconnect makes the underwriter doubt both documents at once.
What to look at. Pull the total earned revenue off your WIP (the sum of the earned-revenue column) and compare it to the revenue on your income statement for the same period. Pull total underbillings and match them to the costs-and-earnings-in-excess-of-billings current-asset line on the balance sheet. Pull total overbillings and match them to the billings-in-excess-of-costs current-liability line. All three should tie exactly, or within a documented rounding tolerance.
The threshold. As a rule of thumb, treat a gap larger than about 1% of total contract revenue as a flag. (This is a practitioner tolerance, not a published surety standard; the underlying expectation is simply that the WIP and the books tell the same story.) A material disconnect is worse: the WIP shows profitable work while the GL shows losses, or the reverse. Grit Insurance Group says your WIP and financial statements "should tell the same story"; when they don't, the underwriter is left to "question the accuracy of both documents" (Grit Insurance Group). There is no acceptable version of a signed WIP that doesn't tie to the trial balance.
What a failure signals. A reconciliation gap means either the WIP is being maintained separately from the accounting system, which is manual-error risk, or someone adjusted one side without the other, which is control risk. Both tell the underwriter the package may not be accurate, and they apply that doubt to every other number on the schedule.
How to correct it. Tie the three control totals before the package goes out, and keep the worksheet that proves they tie. If the WIP and the GL are built in two different places by two different people, that gap will reopen every month. The durable fix is to build the WIP off the same cost ledger the financial statements draw on, so the totals tie by construction instead of by hand-matching after the fact.
Test 5: Is your overbilling position backed by cash? (Overbilling coverage ratio)
Pass/fail in one line: overbilling is only healthy if the cash it generated is still on hand; one published threshold is that net overbilling above 10–12% of total backlog starts to draw surety questions.
What to look at. Sum total overbillings (the billings-in-excess-of-costs figure) across all active jobs, and set that next to your current cash and short-term liquid assets. Then set total overbillings against total backlog. Finally, scan individual jobs for any single project whose overbilling runs unusually large relative to its contract value.
The threshold. Northstar Financial Advisory puts the portfolio line at backlog: "if your net overbilling exceeds 10% to 12% of total backlog, the surety will ask questions." On a single job, the same source flags an overbilling of 15% or more of the total contract value as a front-loaded-billing or "job borrow" signal, meaning one job's advance billings are funding losses on another. Job borrow is one of the more serious things a surety can find, because it means the cash on your balance sheet isn't actually available to finish the work it was billed against.
What a failure signals. The underwriter wants overbilling to be matched by cash on hand. You billed ahead and you collected, which is fine. Overbilling without the corresponding cash means the advance billing has already been spent, and the work still has to be performed. That is a future-performance risk the surety has to carry, and it discounts the working-capital picture your balance sheet is showing.
How to correct it. Where the cash isn't there, be ready to explain where it went and how completion will be funded. Where a single job is heavily front-loaded, expect the billing-schedule question and have the contract terms ready. The underbilling formula and balance-sheet treatment cover how the overbilling figure is built in the first place.
What should you do if a test fails?
After all five tests, any failure needs either a documented explanation or a correction before the package leaves your desk. The surety prefers a clean WIP to a verbal caveat every time. The target is to walk into the renewal meeting with a schedule that answers all four of the underwriter's questions (profitable, billing accurately, not overextended, estimates reliable) without requiring a follow-up phone call. Run that same audit monthly and the clean, current WIP starts growing your program over time, not just renewing it. That is how you track and increase your bonding capacity instead of defending it once a year.
The underwriter reads the tests in the order above; you fix them in a different one. If more than one test fails, fix them in this order: (1) WIP-to-GL reconciliation first, because it undermines the credibility of everything else; (2) underbilling aging, because it's a direct disallowance against your working capital; (3) the gain/fade trend, because it governs whether your future estimates are believed; (4) the overbilling ratio, because it's a cash-coverage risk; and (5) ETC freshness, which is the easiest to fix. Fix it regardless.
One thing this post deliberately doesn't do is catalog why each of these patterns frightens an underwriter, or the other red flags that don't show up as one of these five tests. For the full list of patterns that cause underwriters to cut capacity — and why each one matters to your bonding program — see what surety underwriters actually look for in your WIP report. This post is the process; that one is the taxonomy.
Frequently asked questions
How far in advance should a GC audit their WIP before a surety renewal? 60 to 90 days before your annual renewal meeting. That window gives you enough time to correct an underbilling aging problem, push project managers to refresh their estimates to complete, and reconcile the WIP to the general ledger before the package is assembled. Corrections made after the package has already gone to the surety carry less weight than a clean schedule that never needed them.
What is the underbilling ratio and what threshold concerns a surety underwriter? The underbilling ratio is total underbillings measured against your backlog (or, as some sureties frame it, against equity or working capital). As a rule of thumb a small underbilling balance is normal, but once it climbs into the low-double-digit percentages an underwriter will ask why you are earning work faster than you are billing it — treat these cutoffs as directional, not as a published surety standard. Late-stage underbillings — on jobs 90%+ complete — draw the hardest scrutiny, because the window to collect is narrow. A surety can disallow an uncollectible underbilling from your working capital outright (Old Republic Surety, via NASBP).
Can overbilling hurt my bonding capacity? Yes, if it is not backed by cash. Overbilling improves short-term cash flow and can look healthy — until the surety underwriter checks whether the cash is still on hand. If overbillings were consumed to fund losses on other jobs (called job borrow), the reported working capital is partly illusory. One published threshold: net overbilling above 10–12% of total backlog, or a single job overbilled by 15% or more of its contract value, starts to draw surety questions (Northstar Financial Advisory).
What happens if my WIP does not reconcile with my general ledger? A WIP-to-GL mismatch makes the underwriter question both documents at once. If the WIP shows profitable work and the income statement shows losses, the surety underwriter cannot tell which is right and will assume the worse case. Grit Insurance notes that your WIP and financial statements should tell the same story; when they don't, the underwriter is left to "question the accuracy of both documents" — costing you confidence before they even reach the balance sheet.
How does profit fade affect my bonding capacity? Consistent profit fade — jobs finishing at lower margins than bid — signals poor estimating accuracy, which directly undercuts the underwriter's confidence in your cost-to-complete figures. If your current EAC can't be trusted, neither can your percent-complete or earned-revenue numbers, and the WIP loses its value as the document that sets your capacity.
What does adjusted working capital mean for bonding capacity, and how does an underbilling affect it? Adjusted working capital is the surety's conservative version of working capital — current assets minus current liabilities after the surety strips out assets it doubts will convert to cash, including receivables aged over 90 days and underbillings from jobs showing profit fade or low collectibility. That figure sets your bonding program — as a general rule of thumb a surety "may allow a contractor to bond 10 times the amount of adjusted working capital" (SuretyCFO), with the aggregate program commonly running in a 10×–20× band depending on the surety. An underbilling that gets disallowed reduces adjusted working capital dollar-for-dollar, shrinking your capacity at the same multiple.
How WIP Ready helps
WIP Ready runs the first three of these tests for you, continuously, instead of in a scramble 60 days out. Because every ETC comes in as a dated, attributed submission from the PM, not a number chased over email, the freshness check in Test 1 is just reading a timestamp. The gain/fade trend in Test 2 is tracked per job across periods, and the underbilling aging in Test 3 is on the dashboard before you ever export the package to your agent. The figures the WIP needs from your project data tie to the same Procore cost records the books run on, which is what keeps the Test 4 reconciliation honest. None of that replaces your judgment on a hard job. It just means you walk into the renewal already knowing where the underwriter will look. If that's the cycle you'd rather run, see wipready.com.
