Contractor Surety Bonds: Bonding Capacity and Cost
Contractor Surety Bonds: Bonding Capacity and Cost
A contractor with $150,000 of working capital may be able to bond a single job of about $1.5 million. On a $1 million job with an 8% margin, a 2% bond premium takes a quarter of the profit and a 4% premium takes half. Surety bonds look like insurance, but they are underwritten and repaid like credit, and the contractor's balance sheet and credit decide both how big it can grow and how sharply it can bid.
What you'll learn
A bond is credit, not insurance
A contractor bidding on public work, and on much private work, must provide surety bonds: a guarantee from a surety company that the contractor will perform the job and pay its subcontractors and suppliers. The bond looks like insurance and is sold by insurance companies, but it works like credit. If the surety pays a claim, it expects the contractor, and usually the owners personally, to pay it back. The premium is not a charge for pooled risk; it is a fee for lending the surety's balance sheet to a contractor it expects never to fail.
| Bond | What it guarantees | Who it protects |
|---|---|---|
| Bid bond | The contractor will sign the contract and provide performance and payment bonds if it wins | The project owner |
| Performance bond | The work will be completed according to the contract | The project owner |
| Payment bond | Subcontractors, laborers and suppliers will be paid | Those lower in the payment chain, who often cannot file liens on public property |
On federal work, bonds are mandatory. The Miller Act requires performance and payment bonds on federal construction contracts above $150,000, and most states have similar laws, often called Little Miller Acts, for state and local projects. Many private owners and general contractors require them as well. For a growing contractor, bonding capacity sets the size of the jobs it can win.
How sureties decide
Surety underwriters look at what any lender would, often summarized as character, capacity and capital.
- Capital. Working capital and net worth, taken from financial statements. Larger programs require reviewed or audited statements prepared by a CPA familiar with construction accounting.
- Capacity. Experience with jobs of similar size and type, and the backlog already committed.
- Character. Track record, references and, for smaller contractors, the owners' personal credit.
- Work in progress. A schedule showing each open job's contract value, cost to date, billings and estimated profit. Per our retainage analysis, retainage and underbilling can make a profitable contractor look short of cash.
Every bond comes with an indemnity agreement. The contractor, and typically its owners and their spouses, agree to reimburse the surety for any loss. Per our personal guarantee analysis, this is a personal guarantee in all but name, and it survives the job.
Bonding capacity, worked
Sureties set limits on the largest single job and on total bonded backlog. Practice varies, but limits are commonly expressed as multiples of working capital, with single-job limits often around ten times working capital and aggregate limits higher.
| Working capital | Single-job limit at 10× | Aggregate limit at 20× |
|---|---|---|
| $100,000 | $1,000,000 | $2,000,000 |
| $150,000 | $1,500,000 | $3,000,000 |
| $200,000 | $2,000,000 | $4,000,000 |
That makes owner distributions a growth decision. Per our growth cash analysis, contractors are especially exposed to the gap between doing work and being paid for it, and the same working capital that funds that gap is what sureties measure. A contractor that takes cash out at year end before its statements are prepared shows the surety a smaller balance sheet than it actually runs on.
What bonds cost
Premiums are a percentage of the contract value and fall as job size rises. Standard-market contractors with strong financials pay low single-digit percentages; contractors with weak credit or thin statements may pay several times as much, or need a specialist program.
| On a $1,000,000 job with an 8% expected margin | Standard rate (2%) | Higher-risk rate (4%) |
|---|---|---|
| Expected profit before bond | $80,000 | $80,000 |
| Bond premium | $20,000 | $40,000 |
| Premium as share of margin | 25% | 50% |
The bond premium is usually priced into the bid, so a contractor paying 4% competes against one paying 2% with a $20,000 handicap on a $1 million job. Per our job pricing analysis, margins on competitively bid public work are thin, and a cost difference of that size can decide who wins. Credit quality shows up directly in the bid price.
What happens when a claim is made
When an owner declares a contractor in default or a supplier claims on a payment bond, the surety investigates and chooses among paying the claim, financing the contractor to finish, arranging a replacement contractor, or disputing the claim. Whatever it pays, it then pursues under the indemnity agreement, including against the owners' personal assets. A claim also follows the contractor: it will be disclosed to every future surety and can end a bonding program.
- Most claims start as cash shortfalls, not bad work. Per our cash flow forecasting analysis, a contractor that sees a gap coming weeks ahead can arrange financing or renegotiate timing before a supplier goes unpaid.
- A failing subcontractor becomes the contractor's problem. Per our supplier failure analysis, prime contractors often require bonds from key subcontractors for the same reason owners require them from primes.
- Bonds are not liability insurance. Per our business insurance analysis, general liability, builder's risk and workers' compensation cover different losses, and the surety will expect them to be in place.
Calling the surety early is usually better than calling it late. Sureties can often help a contractor in difficulty finish a job more cheaply than they can pay a completion contractor after a default, and a contractor that brings a problem forward preserves a relationship that one that hides it does not.
Building bonding capacity
- Get statements a surety can rely on. Move from compiled to reviewed statements, and use an accountant who reports on a percentage-of-completion basis with a work-in-progress schedule.
- Retain earnings. Leave profit in the business to build working capital, and avoid year-end distributions that shrink the balance sheet the surety sees.
- Establish bank credit. An unused line of credit counts in the surety's favor as evidence of liquidity; per our business credit score analysis, the business's own credit file affects both the line and the bond rate.
- Grow in steps. Sureties prefer contractors whose largest job is not far above their largest completed job.
- Watch customer concentration. Per our customer concentration analysis, a backlog dominated by one owner or general contractor is a risk the surety will price.
- Consider the SBA program. The Small Business Administration's Surety Bond Guarantee Program guarantees a share of the surety's loss on bonds for small contractors who cannot obtain bonding through standard markets.
Business credit is part of bonding capacity
Sureties and the banks behind your line of credit both check your business credit file. HL Hunt Business Credit Builder reports on-time payments to business credit bureaus every month, building the record that supports lower bond rates and larger programs.
The case against chasing bonded work
Bonded public work brings large, creditworthy customers and steady volume, but it comes with costs that do not appear in the premium. The indemnity agreement puts personal assets behind every job. Payment bonds and prompt-payment rules protect subcontractors but not the prime contractor, which may wait months for change orders and retainage. Low-bid procurement rewards the lowest price, and research on procurement has shown that bidders close to insolvency may bid aggressively low because they have little left to lose, which sureties are meant to screen out but cannot always. Per our standard contract analysis and escalation clause analysis, public contracts often leave cost risk with the contractor. For some contractors, private work with negotiated terms and no bond requirement earns better returns on the same capital. The decision should rest on margin after bond cost, payment timing and personal exposure, not on contract size alone.
Frequently asked questions
A surety guarantees performance and payment, then recovers any loss from the contractor and its owners under an indemnity agreement.
Mainly from working capital, net worth and experience. Single-job limits are often around ten times working capital.
A percentage of contract value. On a $1 million job, 2% versus 4% is a quarter versus half of an 8% margin.
On federal construction contracts above $150,000 under the Miller Act, on most state public work, and often by private owners.
Key takeaways
- Surety bonds guarantee performance and payment, and the surety expects to be repaid for any claim.
- Owners usually sign a personal indemnity agreement that works like a personal guarantee.
- The Miller Act requires performance and payment bonds on federal construction contracts above $150,000.
- Single-job bonding limits are often around ten times working capital.
- Distributing $50,000 instead of retaining it can cost about $500,000 of single-job capacity.
- On a $1 million job with an 8% margin, a 2% premium takes 25% of profit and a 4% premium takes 50%.
- Reviewed statements, retained earnings, bank credit and stepwise growth build capacity.
- Weigh bonded work on margin after bond cost, payment timing and personal exposure.
References
- Miller Act, Bonds of Contractors of Public Buildings or Works, 40 U.S.C. §§ 3131–3134.
- Federal Acquisition Regulation, Part 28, Bonds and Insurance, 48 C.F.R. Part 28.
- U.S. Small Business Administration. Surety Bond Guarantees, 13 C.F.R. Part 115.
- Calveras, A., Ganuza, J.-J., & Hauk, E. (2004). Wild Bids. Gambling for Resurrection in Procurement Contracts. Journal of Regulatory Economics, 26(1), 41–68.
This guide is educational and does not constitute legal, surety or financial advice. Working capital multiples, premium rates, contract values and margins are stylized illustrations; actual bonding limits and rates vary by surety, contractor and market. Bond requirements and thresholds are set by federal, state and contract terms that can change. Consult a surety agent and counsel for your situation.