Bonding Capacity: How Sureties Set Single-Job and Aggregate Limits

Underwriters often frame the review as character, capacity and capital. Federal rules use similar words: SBA's surety bond regulation directs participating sureties to evaluate a principal's credit, capacity and character. SBA's program page also tells small contractors they must meet the surety company's requirements on all three. The terms describe a way of reading a contractor rather than a scoring formula.

Character is the record of finishing jobs, paying subcontractors and suppliers and handling disputes. Capacity is the ability to perform: the people who run jobs, the equipment, the cost controls and experience with work of the same type, size and location. Capital is the financial strength to absorb a bad job. A contractor strong in two can still be limited by the third, depending on the surety's guidelines.

The level of CPA work behind the statements often tracks the size of program a surety will consider. In California, the Board of Accountancy treats audits and reviews as attest engagements whose reports only a CPA with attest authority may sign, while a compilation is not an attest engagement. Many sureties write smaller programs on compiled or reviewed statements and ask for audits as requests grow, though the step points vary by surety.

Public owners set their own floors, as the table shows. Ask the surety which level it expects before the fiscal year closes, because changing levels after year-end can push the statements past the bids they were meant to support. Send the notes and supplemental schedules with the statements, and keep the internal WIP tied to the CPA's figures.

Working capital, current assets minus current liabilities, carries payroll, materials and retention until owners pay, and underwriters commonly adjust it before relying on it. Receivables well past due, retention on disputed jobs, amounts owed by owners or affiliates and large underbillings may be discounted or set aside, while the current portion of equipment debt weighs against it. The adjusted figure typically drives the conversation.

Net worth gets similar treatment. Goodwill, loans to shareholders and investments in affiliates that have not signed the indemnity are often excluded, while owner loans may count closer to equity when subordinated to the surety in writing. Dividends and tax distributions that pull retained earnings out can shrink capacity just as backlog grows, and equipment-heavy civil firms face questions about how much fleet debt competes with working capital.

Open work is what uses capacity, so the surety reads the WIP schedule for what remains: cost still to incur, gross profit still to earn and when each job will finish. A backlog with thin remaining margin, or one that bunches several mobilizations into the same quarter, can use more capacity than its contract values suggest. Unbonded private work and joint venture shares are commonly added to the picture.

Send the bid list with the WIP: the jobs expected over the next six to 12 months, their likely bond amounts and how they overlap current work. An underwriter who sees the pipeline can plan the aggregate around it. Payment bonds often run to the full contract amount on public work, so a large award can fill the aggregate even when the performance bond is set lower.

Sureties read the bank line as the second source of cash after working capital. A line that is available, largely unused and renewed ahead of maturity supports capacity, while a line drawn to fund payroll or pressed against its borrowing base usually prompts questions. Underwriters typically ask for the loan agreement, balance, borrowing base and maturity date, then compare the line with receivables and seasonal swings in the WIP.

Letters of credit issued under the same line reduce what is left for the jobs, whether they collateralize a wrap program deductible or stand in for a subdivision or permit bond. The California Labor Commissioner's model prequalification questionnaire treats a line-of-credit letter as supplemental information only, not a substitute for the required financial statements, and many sureties read a bank letter the same way.

Capacity rests on the balance sheets behind the general indemnity agreement, not on the operating company alone. Sureties commonly ask the company, its parent and affiliates and the owners to sign, often with spouses. They also read the individuals' personal financial statements. Adding a holding company or real estate affiliate as an indemnitor may support a larger program, but it also places those assets behind every bond the surety writes for the group.

The reverse holds too. Moving cash or equipment into an entity that has not signed, or the exit of an owner who has, can reduce the capital behind the program even when the operating company looks unchanged. Some established firms negotiate limits on personal indemnity as the corporate balance sheet grows, depending on the surety. Counsel should review any change in signers.

Contract bonds are written against a contract price, a schedule and a margin the surety can follow on the WIP, and the exposure typically shrinks as the job is built. Subdivision improvement bonds behave differently. The developer is the principal, and there is no contract price or billing to track, so the surety reads the funding for the improvements, the engineer's estimate and the bonds already open. Phased tracts can stack bonds for years.

Encroachment and right-of-way permit bonds are often small, but a utility or paving contractor may carry dozens across cities, counties and the state DOT, each open until the permit is closed out and the bond released. Maintenance and warranty bonds run after acceptance for a stated period, and sureties may weigh them lighter because the work is built. Both stay on the surety's books until released, so an unmanaged stack can crowd the aggregate.

Capacity does not return at substantial completion. A performance bond typically stays open through acceptance and any warranty period the contract carries, and a payment bond remains exposed until claim deadlines pass. Until the surety sees evidence that an obligation has ended, it usually keeps the bond in the aggregate, even when the crews left months earlier.

Closing out is largely paperwork. Get written acceptance, confirm final payment and the release of retention, collect any agency letter releasing a permit or maintenance bond and send copies to the surety. A contractor that sends releases before the surety's status inquiry tends to see the room return sooner, and the completed job's final margin then feeds the next review.

Public owners run their own financial screen. In California, Public Contract Code section 20101 lets cities, counties and special districts prequalify bidders on a standardized questionnaire and financial statement, and the Labor Commissioner publishes a model questionnaire for them. Under that law the questionnaires and financial statements are not public records, though the names of contractors applying are.

The model asks for reviewed or audited statements and a notarized statement from an admitted surety, not an agent or broker, that current bonding capacity is sufficient, along with the capacity available; the annual version asks for aggregate and per-project figures. It also asks whether a surety has completed a contract for the firm after a default in the past five years, paid bond claims or denied it bond coverage.

State DOTs keep their own rules. TxDOT's Confidential Questionnaire uses an audited statement less than one year old and sets bidding capacity from net working capital multiplied by a factor TxDOT determines. A firm can hold more agency capacity than its surety will support, or the reverse. The lower number typically decides what it can bid.

SBA's Surety Bond Guarantee program backs bid, performance, payment and ancillary bonds for small businesses that meet SBA size standards. Its program page lists contracts up to $9 million for non-federal work and up to $14 million for federal contracts, and the regulation ties the higher figure to a federal contracting officer's certification that SBA's backing is necessary. The surety still underwrites the contractor.

Treasury limits the surety itself. Under 31 CFR 223.10, a company holding a Treasury certificate of authority may not underwrite a single risk greater than 10 percent of its paid-up capital and surplus, and section 223.11 handles larger amounts through co-insurance, reinsurance or, for some bonds, pledged assets. Circular 570 lists certified companies and their limitations. A contractor growing into larger public work should ask whether its surety's limitation fits its bid list.

Capacity typically grows in steps the surety can see coming. Agree on a plan before the fiscal year starts: the statement level the surety will want, the working capital and retained earnings that would support the next request and the job size it would consider after a successful finish. Then leave earnings in the business, keep the bank line unused and deliver interim statements and WIP schedules on the agreed calendar.

Grow the job size deliberately. A first contract well above the firm's completed history may be easier to support as a joint venture with an experienced partner, with bonded subcontractors on the riskiest scopes or after a comparable job closes at its bid margin. Report fade early, get finished bonds released and explain any loss before the underwriter finds it. None of these steps assures a particular limit.