Bonding capacity and surety prequalification

Why the surety is so careful

A surety bond is not insurance for the contractor. Before it writes a bond, the surety has the company, and usually its owners and their spouses personally, sign an indemnity agreement. If the surety pays a claim, it expects the contractor to repay it. So the surety underwrites the way a lender does: it asks whether this contractor can finish this work and pay its bills. See bid bond vs performance bond vs payment bond for what each bond covers.

What underwriters look at

Sureties often summarize it as character, capacity and capital.

• Character: the owners' reputation, how they have handled past disputes, references from owners, architects, subs and suppliers.
• Capacity: experience with work of this type and size, the key people and their history, equipment, and whether the job is in a region and trade the company knows.
• Capital: the financial statements, working capital, net worth, debt, bank line of credit and profitability.

The paperwork that goes with it usually includes:

• year-end financial statements prepared by a CPA, with larger programs asking for a review or audit level rather than a compilation
• a work-in-progress schedule showing each job's contract value, cost to date, estimated cost to complete, billings and gross profit
• a schedule of completed jobs
• a business plan or backlog outlook
• personal financial statements for the indemnitors

The contractor financial ratios guide works the current ratio, working capital and debt to equity that the underwriter reads first. Over and underbillings on the WIP schedule matter too, because underbilling can hide a job losing money. The free over and under billing calculator works one job by cost to cost.

A worked capacity check with invented terms

Each surety sets its own method. Some size a program partly as a multiple of working capital or equity, and the multiple varies by surety and contractor. For this example only, assume a surety that sets the aggregate limit at 10 times working capital and the single job limit at 4 times working capital.

The contractor has current assets of $1,150,000 and current liabilities of $730,000.

• Working capital: 1,150,000 - 730,000 = $420,000
• Aggregate limit: 420,000 x 10 = $4,200,000
• Single job limit: 420,000 x 4 = $1,680,000

Its uncompleted bonded backlog is $2,900,000. It wants to bid a $1,500,000 job.

• Room left in the aggregate: 4,200,000 - 2,900,000 = $1,300,000
• The job fits the single job limit (1,500,000 is less than 1,680,000) but not the aggregate (1,500,000 is more than 1,300,000).

Check: 2,900,000 + 1,500,000 = 4,400,000, which is 200,000 over 4,200,000, and 1,500,000 - 1,300,000 = 200,000.

The contractor's options are to wait until $200,000 more of the backlog is completed, add working capital (at 10 times, 200,000 / 10 = $20,000 more would do it on these terms), or ask the surety to make an exception for this job. Check: (420,000 + 20,000) x 10 = 4,400,000. The free bonding capacity estimator runs this check with multiples you enter; it is a rough estimate, and only a surety sets real limits.

How capacity grows

• Profitable, well-documented jobs. The completed jobs schedule is the track record.
• Retained earnings. Profit left in the company raises working capital and equity. Large owner draws do the opposite.
• Better financial statements. Moving from a compilation to a review or audit gives the surety more confidence in the numbers.
• Steady growth. A sudden jump in job size worries underwriters more than gradual steps.
• A surety bond producer who knows the market. Producers place the account with a surety and present the contractor's file.

Owner prequalification is a separate step

Owners prequalify bidders too, especially on large or public work. They may ask for a qualification statement with experience, key staff, safety record, financial information and a letter from the surety stating the bonding available. Public agencies in some states have formal prequalification rules for certain work, and those rules differ by state and agency. The OSHA 300 log guide covers the safety records these forms ask for.

Common mix-ups

• Treating capacity as a fixed number. It changes with each financial statement, each job and the surety's view of the market.
• Counting the full contract value of open jobs. The aggregate usually counts work not yet completed.
• Thinking a bond protects the contractor. It protects the obligee, and the contractor repays the surety.
• Stating one multiple as the rule. Sureties use their own methods.

On the NASCLA exam

The bulletin lists subject areas, not topics. We place bonds and surety under Procurement and Contracting Requirements, 31 of the 115 scored questions. The NASCLA Contractors Guide to Business, Law and Project Management fits by its title, so tab its bonding and financial management topics.

Practice it

Work the ratios for an invented balance sheet in contractor financial ratios, then size a bid bond on what is a bid bond.

Take the free 10-question check

Start the free 10-question check. It is weighted to the twelve NASCLA subject areas, needs no signup and explains every answer, so you see which area to study first.

The NASCLA Commercial course has a lesson for each of the 12 subject areas that shows which listed reference to open and how to apply it, original practice questions with every answer worked, and four timed practice exams of 115 questions on a 330-minute clock. Your scores come back by subject area, so you know where the next study hour goes. See the course.

Not affiliated with or endorsed by NASCLA or PSI. NASCLA and PSI are named only to identify the exam and its test vendor.

Sources

Show the list

• PSI Candidate Information Bulletin 1458, content outline and reference list, updated 7 Jul 2026. Retrieved 5 Nov 2026.
• NASCLA Commercial Exam, NASCLA. Retrieved 5 Nov 2026.
• All examples use invented numbers and an invented surety method. Real sureties set their own limits.