Bid Bonds in Public Construction: Costs, Indemnity, and Release

Bid bonds in public construction are financial guarantees, issued by a surety company, that promise a government agency the contractor will sign the contract and provide the required performance and payment bonds if their bid wins. If the winning bidder walks away, the surety pays the agency the difference between that bid and the next acceptable one, up to the bond’s penal amount. Three parties are involved: you (the principal), the agency soliciting the bid (the obligee), and the surety standing behind your promise. The surety is not an insurer absorbing a loss. It’s closer to a co-signer, and it expects to be made whole for anything it pays out.

When a Bid Bond Is Required

Federal construction contracts over $150,000 require performance and payment bonds under the Miller Act (40 U.S.C. §§ 3131–3134), and federal procurement rules require a bid guarantee as a condition of submitting a sealed bid on those covered projects. For contracts between $35,000 and $150,000, the contracting officer picks from alternative payment protections like irrevocable letters of credit or escrow agreements.¹

On federal projects, the bid guarantee must be at least 20% of the bid price and cannot exceed $3 million.² That’s a higher percentage than you’ll see on most state and local projects, where 5% to 10% of the bid amount is the usual range.

Every state has its own bonding statute for publicly funded construction, commonly called a “Little Miller Act.” The specifics vary, but the contract value that triggers mandatory bonding at the state level typically falls between $20,000 and $100,000. The one rule that doesn’t vary: submitting a bid without the required guarantee gets you disqualified on the spot at the public bid opening.

For federal work, the surety also has to be acceptable to the government. Corporate sureties must appear on the Department of the Treasury’s Listing of Approved Sureties (Circular 570), and the listing sets each surety’s underwriting limit — the maximum it can guarantee on a single bond.³ State and local agencies set their own expectations, but most want a surety licensed in the state where the work will happen.

What a Bid Bond Costs

Here’s the part that catches new bidders off guard: a bid bond usually costs you nothing upfront. Surety companies generally don’t charge a separate premium for the bid bond itself, especially for contractors who bid regularly. The surety treats it as the gateway to the performance and payment bonds that follow a contract award, and those carry premiums calculated as a percentage of the contract value.

The SBA’s Surety Bond Guarantee Program charges no fee for bid bond guarantees. Performance and payment bond guarantees through that program carry a fee of 0.6% of the contract price. State insurance departments regulate the premiums sureties can charge, and sureties cannot require you to buy unrelated insurance products as a condition of issuing a bond.⁴

What the Surety Will Ask For

Getting approved means handing the surety a full financial and operational profile. The underwriter is answering two questions: can you handle this specific project, and how much total work can you carry at once? Plan to provide:

CPA-prepared financial statements covering at least two fiscal years, which the surety uses to evaluate liquidity and debt.
Certificates showing general liability and workers’ compensation coverage.
A list of completed projects with owner references so the underwriter can verify your technical ability for this type of work.
The bid invitation or Notice to Bidders from the agency, which includes the project number, bid opening date, and estimated contract value.

You’ll fill out an application, usually through a licensed surety broker, specifying whether the bond is for a fixed dollar amount or a percentage of your bid. Errors in the project number or bid date can get your entire proposal rejected by the agency, so check those against the solicitation carefully.

Single-Project and Aggregate Capacity

Your surety sets two limits that govern how much bonded work you can run at once. The single-project limit is the largest individual job the surety will guarantee. The aggregate limit is the maximum combined value of all your bonded work. If you have a $5 million single-project limit and a $25 million aggregate, bonds up to $5 million move quickly as long as your total backlog stays under $25 million. A new project that pushes you past the aggregate triggers a separate review.

These numbers aren’t fixed. They reflect the surety’s current comfort with your financials, experience, and work-in-progress, and they tend to grow as you complete bonded work profitably.

Personal Indemnity

One detail worth knowing before you sign: the general agreement of indemnity almost always requires a personal guarantee from the company’s owners, not just the corporate entity. If the surety ever pays a claim, that agreement makes you personally responsible for reimbursing every dollar, including legal costs. The surety’s willingness to issue the bond rests on having recourse against the people behind the company.

Submitting the Bond

For established firms with an existing bonding relationship, turnaround on an approved application is often 24 to 48 hours. First-time applicants should expect a week or more, because the surety is building a file from scratch.

Once the bond is issued, you sign it with your authorized company signature. Electronic bonds using secure digital signatures are standard now. Attach the executed bond to your sealed bid package and submit it before the deadline. Public agencies enforce bid deadlines strictly. A package arriving one minute late gets rejected no matter how competitive the price is, so keep delivery confirmation.

Alternatives to a Surety Bond

Federal procurement rules let you substitute other forms of security for a traditional bid bond:⁵

U.S. bonds or notes deposited at par value equal to the required bond amount, with a power of attorney authorizing collection on default.
Certified checks, cashier’s checks, bank drafts, or money orders drawn to the order of the federal agency for the full bond amount.
An irrevocable letter of credit from a federally insured financial institution, requiring no documentation beyond a written demand for payment. A separate letter of credit is needed for each bond.

Combining different types of security is permitted. State and local agencies may accept similar alternatives, with specifics that vary by jurisdiction.

When the Bond Is Released

A bid bond guarantees you won’t withdraw during the acceptance period in the solicitation. On federal solicitations using an irrevocable letter of credit as the guarantee, the letter must stay valid for at least 60 days after the bid acceptance period closes.⁵ Traditional bid bonds follow a similar timeline and typically expire once the contract is awarded and the winning contractor executes the required performance and payment bonds.

If you bid but weren’t selected, you can request release of your guarantee. Federal agencies are required to return security or its equivalent once the obligation ends.⁵ With a standard surety-backed bond there’s nothing physical to return; the surety’s obligation simply terminates. The second-lowest bidder’s bond is typically held until the winner has fully executed the contract, in case that bidder has to be called up.

What Happens If You Withdraw After Winning

Walking away from a winning bid triggers real financial consequences. The agency declares the bid bond forfeited, and the surety pays the obligee the difference between your bid and the next lowest responsible bid, up to the penal amount of the bond. On federal projects at 20% of the bid price, that exposure can be significant.²

The surety doesn’t absorb that loss. Under the indemnity agreement, you reimburse every dollar paid out, plus the surety’s legal fees and expenses. Because most indemnity agreements include personal guarantees, the obligation reaches past the business entity into the owners’ personal assets. Courts consistently enforce these agreements.

The reputational damage runs alongside the financial hit. Your surety may reduce your bonding capacity, tighten scrutiny on future applications, or decline new bonds. Other sureties learn about the default during underwriting. For contractors who depend on public work, a single default can effectively shut them out of the market for years.

Defective Bid Bonds and Clerical Errors

A technical defect in your bid bond isn’t always fatal. Federal contracting officers can waive noncompliance with bid guarantee requirements in several situations:⁶

Only one bid was received. The contracting officer may require the bond before award rather than rejecting the sole bid.
The bond amount is too low but still equals or exceeds the gap between your bid and the next-highest acceptable bid.
The bond was received late and the late receipt qualifies under general late-bid rules.
The bidder’s signature is missing from the bond, but the bond was submitted with a signed offer and is otherwise proper.
The date is wrong or missing on an otherwise acceptable bond.
The United States isn’t listed as obligee, but the bond correctly identifies the bidder, solicitation number, and project location.

The contracting officer has to determine in writing that accepting the defective bond won’t harm the government’s interests. State and local agencies set their own rules on defective bonds, and some are much less forgiving.

Math errors in the bid itself are treated separately. Courts distinguish mechanical errors like transposed numbers, dropped zeros, or an omitted line item from judgment errors like underestimating material costs or guessing wrong on labor hours. Mechanical mistakes generally qualify for relief from the bid. Judgment errors do not. Courts typically require that the mistake be serious enough that enforcement would be unfair, that it wasn’t caused by gross negligence, and that the agency can be returned to its original position without serious harm beyond losing the low bid. Notice is critical: tell the agency as soon as you discover the error, ideally before it has acted on your bid. Some states set statutory deadlines as short as 48 hours after the bid opening.

SBA Surety Bond Guarantee Program

Small contractors who can’t get bonded on their own may qualify for help through the SBA’s Surety Bond Guarantee Program. The SBA guarantees part of the surety’s risk, which makes sureties more willing to issue bonds to firms they would otherwise turn down. To qualify, the business must meet SBA size standards, and the contract cannot exceed $9 million for non-federal work or $14 million for federal contracts.⁷

The SBA charges no fee for bid bond guarantees, removing a potential cost barrier for small firms trying to break into public construction.⁷ Performance and payment bond guarantees carry a 0.6% fee on the contract price. You still have to satisfy the surety’s evaluation of credit, capacity, and character. The SBA guarantee doesn’t waive underwriting; it just gives the surety a reason to take a chance on a less-established firm.

1
Acquisition.GOV. FAR 28.102-1 General
2
eCFR. 48 CFR Part 28 Subpart 28.1 – Bonds and Other Financial Protections
3
Acquisition.GOV. FAR 28.202 Acceptability of Corporate Sureties
4
eCFR. 13 CFR 115.32 – Fees and Premiums
5
Acquisition.GOV. FAR Part 28 – Bonds and Insurance
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Acquisition.GOV. FAR 28.101-4 Noncompliance With Bid Guarantee Requirements
7
U.S. Small Business Administration. Surety Bonds