You know roughly what your bonding capacity is, because your bonding agent told you at your last renewal. What you usually can't see is what it is today — after this month's change orders, the job that's fading, and the two projects you just billed. Your bonding capacity in construction isn't a fixed credit line. It's a number your surety reads off your work-in-progress schedule, and it moves every month whether you're watching it or not.
Here's the gap nobody on the bonding-capacity SERP closes: every guide explains what bonding capacity is and that a clean WIP helps. None tells a Controller how to actually track the number month to month from live project financials, or what moves it up. This post does both. We'll cover how bonding capacity is calculated, how it's read straight off your WIP schedule, what erodes it, and a repeatable monthly workflow to grow it. WIP Ready reads your bonding capacity off live Procore financials, and we'll show that view at the end.
What is bonding capacity in construction?
Bonding capacity is the total surety credit a general contractor qualifies for, expressed as two limits. The first is a single-job limit: the largest bond a surety will write on one project. The second is an aggregate limit: the total value of all bonded work the contractor can carry at once. Both limits are set by the surety, and both move with the contractor's financials.
The two limits work independently, and the smaller one binds. "If your single-job limit is $2 million, you cannot bond a $3 million project no matter how much aggregate room you have left." Projul Aggregate works the same way: "If your aggregate is $5 million and you already have $4 million in bonded backlog, the surety will only consider bonding another $1 million in new work." (Projul) Neither number is permanent — "a bad quarter can shrink your capacity. A strong year-end statement can expand it." (Projul)
How is bonding capacity calculated?
Bonding capacity is calculated from your financials, with working capital as the single biggest lever. Most sureties want working capital equal to at least 5–10% of annual revenue, and the rules of thumb for capacity itself are multiples of that working capital. The exact formula varies by surety; there is no universal number. But the inputs are consistent, and your WIP schedule supplies most of them.
The three Cs: character, capacity, and capital
Sureties underwrite on the "three Cs" — character, capacity, and capital. (Projul) Character is your track record and how you treat subs and owners. Capacity is whether you can actually staff and execute the work. Capital is the financial strength behind the promise. Of the three, capital is the one you measure on a statement, and the one a current WIP keeps honest.
Working capital: the number that moves your limits most
Working capital — current assets minus current liabilities — is the most important number a surety looks at. "Most sureties want working capital equal to at least 5–10% of annual revenue, and many will support $10 to $15 in backlog for every $1 of working capital." (Projul) That second figure is the lever: every dollar of working capital you can defend buys you ten to fifteen dollars of bonded backlog. This is where working capital bonding lives — the question of how much bonded work your liquidity can carry.
The directional rules of thumb for the limits themselves come from the same place. One surety broker pegs single-project capacity at "5–10 times your working capital or net worth" for contractors with strong operations and a clean completion history. Winter-Dent For the aggregate, many growing commercial GCs "aim for bonding capacity equal to 1.0–1.5 times annual revenue." ABC Carolinas Treat both as directional, not formulas — each surety sets its own standards, and other metrics (net worth, debt-to-equity, multi-year profitability, current ratio, days sales outstanding) feed the same decision. (Projul)
How does your WIP schedule determine your bonding capacity?
Your available bonding capacity is read directly off your WIP schedule, on a cost-to-complete basis. The surety takes your aggregate limit and subtracts the bonded work still in progress. That remaining-work figure comes straight from the backlog column on your WIP. "If your aggregate limit is $8 million and your WIP shows $7.5 million in active bonded work on a cost-to-complete basis, the surety knows there is very little room for another project." Grit Insurance
That makes the WIP the document that decides how much room you have left. Underwriters read it to answer four questions: are your jobs profitable, are you billing accurately, are you overextended, and are your cost estimates reliable? (Projul) The WIP uses percentage-of-completion accounting under ASC 606 (earned revenue measured on a cost-to-cost basis), which is exactly how the surety derives remaining bonded backlog from each job's contract value and percent complete.
One rule sits above all of it: the WIP must reconcile to your financial statements. If your financials show profit but the WIP shows jobs losing money, the underwriter stops trusting both documents. (Grit Insurance) A WIP built by hand from stale exports is where that reconciliation quietly breaks.
Take Meridian Construction Group, the fictional GC whose numbers run through this series. Its WIP totals row shows $35.85 million in remaining bonded work across six projects. That backlog figure is the "active bonded work" the surety subtracts from the aggregate limit: the remaining capacity, read straight off the WIP. The 1.0% projected margin on its Lincoln HS Renovation job is the other thing the underwriter sees, and it's the subject of the next section.
What kills bonding capacity? (The three financial patterns to avoid)
Three patterns on a WIP erode bonding capacity faster than anything else: profit fade that signals unreliable estimating, underbilling that inflates working capital with cash you may never collect, and a stale or infrequent WIP that tells the underwriter nothing about today. Each one is visible in a column on your schedule before it shows up in a renewal decision.
Profit fade — and how it signals estimating failure to underwriters
Profit fade — a job's projected margin shrinking as estimated costs climb — tells an underwriter your estimates aren't reliable, and that's the fourth of the four questions they read the WIP to answer. A single faded job is ordinary variance. A pattern is a credibility problem: "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) These profit-fade patterns erode surety confidence, and confidence is what sets your limit.
Underbilling that inflates your working capital
Underbilling (earned revenue you haven't billed yet) can quietly inflate the working capital your surety is crediting you for, and underwriters know to discount it. The clearest illustration comes from the surety side. In an Old Republic Surety analysis, underbillings inflated one contractor's working capital by nearly $3 million, overstating its financial position and the surety program it qualified for. Old Republic Surety / NASBP
The mechanism is worth understanding, because it's about timing as much as accounting. One job was 97% complete at year-end carrying $296,000 in underbillings. Six months later, at 99% complete, those underbillings had grown to $419,000 despite ongoing losses. The underwriter read the trend as a low likelihood of collection and disallowed those amounts from the contractor's working-capital calculation. (Old Republic Surety / NASBP) Underbilling that grows on a losing job isn't liquidity. It's a markdown waiting to happen, and it shrinks the working capital that drives your capacity.
Stale or infrequent WIP that tells underwriters nothing about today
A year-end-only WIP gives the surety a single snapshot to make twelve months of decisions on, and that costs you capacity all year. The surety relies on the WIP "to understand what is actually happening in your business right now, not six months ago when your fiscal year ended." (Projul) When the only WIP on file is stale, the underwriter prices in the uncertainty. A clean, current schedule does the opposite, which is the whole point of the workflow below.
How do I increase my bonding capacity? (The monthly workflow)
You increase your bonding capacity by producing an accurate WIP every month, reconciling it to your financials, reading your remaining capacity off it, and sending it to your surety proactively, even when they didn't ask. The lever isn't a one-time financial-engineering move. It's frequency and accuracy, because a clean current WIP is what raises the surety's confidence and therefore your limit. Here is the six-step workflow to run every close.
- Pull current Procore project financials. Costs to date, contract values, and approved change orders for every active project. This is the objective data: it lives in Procore already, and it's the foundation the rest of the WIP sits on.
- Collect each PM's Estimate-to-Complete (ETC). The one number Procore doesn't hold is the project manager's judgment of what's left to spend. Collect it structured and attributed, with a note field, so every ETC has a name and a timestamp behind it.
- Build or update the WIP schedule. Use percentage-of-completion on a cost-to-cost basis under ASC 606: percent complete = costs to date ÷ EAC, earned revenue = contract value × percent complete. This is where you produce the WIP from Procore data rather than rebuilding it from scratch.
- Reconcile the WIP to your financial statements. Before anything leaves the building, confirm the WIP and the financials tell the same story. A disconnect makes the underwriter distrust both. (Grit Insurance)
- Read your available bonding capacity off the WIP. Take your aggregate limit and subtract the active bonded work, the remaining backlog on a cost-to-complete basis. The difference is your room for new work. (Grit Insurance)
- Send it to your surety proactively. Don't wait to be asked. Monthly submission gives the underwriter a real-time view of your business and builds the confidence that expands limits.
Tracking the number month over month is the outcome of running this loop, not a chart you read once. Finalize January's WIP, then February's, and the change in your remaining capacity is the difference between the two totals rows, which is exactly the trend a surety watches across submissions.
There's one practical reason most contractors don't do this monthly: the WIP takes days to rebuild by hand. If producing the schedule is a 2–3 day Excel project, monthly proactive submission is impossible, and you default to year-end. WIP Ready closes the WIP in about 45 minutes instead of 3 days (wipready.com), which is what turns monthly submission from a heroic effort into a routine one.
How often should I send my surety a WIP?
Send your surety a WIP monthly if you can, and quarterly at the absolute minimum. Sureties reward proactive submission even when they haven't asked: it "builds confidence and gives the underwriter a real-time view of your business." (Projul)
Frame frequency as a capacity lever, not a compliance checkbox. A year-end-only WIP means the surety is making decisions for twelve months based on a single snapshot, while projects come and go and your capacity actually changes throughout the year. (Grit Insurance) If you're actively pursuing capacity increases or carrying heavy backlog, monthly is the cadence that keeps your limit reflecting your real position.
How WIP Ready surfaces your bonding capacity from Procore
WIP Ready gives Finance a fast read on bonding capacity without rebuilding anything. You enter the limit your surety set and the working capital you carry; the dashboard shows how much of that limit your active backlog is consuming and how much room is left, refreshed from live Procore financials every cycle. It's the at-a-glance version of the six-step workflow above: the same inputs, surfaced instead of hand-assembled.
For Meridian, that read looks like this: $35.9 million of active backlog against a $75 million aggregate limit, 47.9% utilized, $39.1 million of room left. Treat the dashboard as your management gauge, the number you watch between submissions. The WIP schedule itself carries the precise cost-to-complete backlog your underwriter actually reads. Both move off the same Procore data every close, so when the dashboard tells you you're tightening on capacity, the WIP you hand the surety will say the same thing.
Here's the honest boundary, because it matters for credibility with your underwriter. WIP Ready surfaces and tracks the inputs your surety reads: current backlog, working capital, profit fade, utilization. It does not set your limit and it does not replace the underwriter. Each surety has its own standards, and the rules of thumb in this post are directional, not formulas. WIP Ready reads from Procore and never writes back; it's a reporting layer, not an accounting system. And it never invents the ETC; the PM who knows the job owns that number, which is exactly why the resulting WIP holds up with the bonding agent.
Frequently asked questions
What is a contractor's bonding capacity? Bonding capacity is the total surety credit a general contractor qualifies for, expressed as two limits: a single-job limit (the largest bond a surety will write on one project) and an aggregate limit (the total bonded work the contractor can carry at once). Both are set by the surety and move with the contractor's financials. (Projul)
How do I calculate my bonding capacity? There's no universal formula, but working capital is the biggest driver. Most sureties want working capital equal to at least 5–10% of annual revenue, and many support $10 to $15 of backlog per $1 of working capital. Directional rules of thumb put single-project capacity at 5–10× working capital and aggregate capacity at roughly 1.0–1.5× annual revenue — each surety sets its own standards. (Projul; ABC Carolinas)
What does a surety look at when evaluating a contractor? Sureties underwrite on the three Cs — character, capacity, and capital — and read your WIP schedule to answer four questions: are your jobs profitable, are you billing accurately, are you overextended, and are your cost estimates reliable? The WIP must reconcile to your financial statements, or the underwriter distrusts both. (Projul; Grit Insurance)
How does working capital affect bonding capacity? Working capital — current assets minus current liabilities — is the single most important number a surety looks at, because capacity is largely a multiple of it. Many sureties support $10 to $15 of bonded backlog for every $1 of working capital, so defending more working capital directly buys more bonded work. (Projul)
Does underbilling affect my bonding capacity? Yes. Underbilling inflates the working capital your surety credits you for, and underwriters discount underbillings that look uncollectible. In one Old Republic Surety analysis, underbillings inflated a contractor's working capital by nearly $3 million, and late-stage underbillings on a losing job were disallowed entirely from the working-capital calculation. (Old Republic Surety / NASBP)
What is the difference between a single bond limit and an aggregate bond limit? A single-job limit is the largest bond a surety will write on one project; an aggregate limit is the total value of all bonded work you can carry at once. The smaller one binds — a $2 million single-job limit blocks a $3 million project regardless of aggregate room, and $4 million of bonded backlog against a $5 million aggregate leaves only $1 million for new work. (Projul)
How do I increase my bonding capacity? Produce an accurate WIP every month, reconcile it to your financials, read your remaining capacity off it, and send it to your surety proactively. A clean, current, frequent WIP raises underwriter confidence, and that confidence translates into higher limits and faster approvals. The lever is frequency and accuracy, not a one-time move. (Grit Insurance)
How often should I send my surety a WIP? Monthly ideally, quarterly at minimum. Sureties reward proactive submission even when not asked, because it gives the underwriter a real-time view of your business. A year-end-only WIP means the surety decides for twelve months on a single snapshot. (Projul; Grit Insurance)
How WIP Ready helps
Your bonding capacity is read straight off your WIP — so if your WIP is stale, you're leaving capacity on the table. The fix isn't financial engineering; it's a current WIP, every month, that the surety can trust. "A clean, accurate, current WIP gives the surety confidence… That confidence translates directly into higher bonding limits and faster approvals." (Grit Insurance) WIP Ready pulls your Procore financials, collects structured ETC from each PM, produces the ASC 606 schedule, and surfaces your bonding capacity from the same data — closing the WIP in about 45 minutes so monthly submission is routine, not heroic.
See your bonding capacity from your next Procore close at wipready.com. No migration, no new accounts — it reads from Procore and never writes back.
