The Miller Act (40 U.S.C. 3131-3134) governs payment bonds on federal construction projects, but its coverage rules generate persistent confusion across the construction industry. General contractors, subcontractors, and suppliers all face questions about thresholds, notice requirements, filing deadlines, and the interplay between bond claims and lien rights.

This FAQ addresses the 15 questions that come up most frequently in practice. Each answer is grounded in the statutory text and federal court interpretations through 2025. State-level bond requirements (Little Miller Acts) are referenced where they differ meaningfully from the federal statute.

Federal Threshold and Applicability

Q1: What is the $150,000 federal threshold for payment bonds?

The Miller Act requires a payment bond on every federal construction contract exceeding $150,000. This threshold applies to the prime contract value between the federal agency and the general contractor. It does not apply to individual subcontract values. If the prime contract is $200,000, a payment bond is required even if no single subcontract exceeds $50,000.

The threshold was set at $25,000 when the Miller Act was enacted in 1935, raised to $100,000 in 1999, and adjusted to $150,000 by the Federal Acquisition Streamlining Act. Unlike some procurement thresholds, the Miller Act threshold is not indexed for inflation and requires legislative action to change.

For contracts between $35,000 and $150,000, the contracting officer has discretion to require payment protection, but it may take the form of alternative payment protections rather than a full surety bond.

Q2: Does the Miller Act apply to every type of federal construction project?

The Miller Act applies to contracts for "the construction, alteration, or repair of any public building or public work of the Federal Government." This covers new construction, renovations, infrastructure projects, and repair work on federally owned facilities. It also covers projects on military installations, national parks, federal courthouses, and government office buildings.

The statute does not apply to supply contracts (delivering materials without installation), service contracts (janitorial, security), or contracts where the federal government is not the owner (such as federally funded but state-owned highway projects, which fall under state Little Miller Acts instead).

Contract Type	Miller Act Applies?	Alternative Protection
Federal building construction over $150K	Yes	N/A
Federal building renovation over $150K	Yes	N/A
Federal infrastructure (bridges, dams) over $150K	Yes	N/A
Federal supply contract (no installation)	No	None required
State highway with federal funding	No	State Little Miller Act
Federal contract $35K - $150K	Discretionary	Alternative payment protection
Federal contract under $35K	No	None required

Q3: Do state projects follow the same rules as federal projects?

No. Every state has its own Little Miller Act governing bond requirements on state-funded and municipal construction projects. While the core concept is the same (payment bonds protect subs and suppliers on public projects where lien rights do not exist), the details differ substantially.

Key variations across states include the contract threshold that triggers the bond requirement (ranging from $10,000 in Pennsylvania to $200,000 in Florida for state-level contracts), who is covered (some states extend coverage to third-tier parties), notice requirements (some states require preliminary notices rather than just 90-day notices), and filing deadlines (ranging from 6 months to 2 years depending on the state).

A contractor operating in multiple states must track each state's specific requirements. Our state-by-state bond claim guide covers all 50 states.

Coverage and Eligibility

Q4: Who exactly is protected by a Miller Act payment bond?

The Miller Act protects two tiers of claimants. First-tier claimants are subcontractors and suppliers who have a direct contract with the prime contractor (the GC). Second-tier claimants are subcontractors and suppliers who have a direct contract with a first-tier subcontractor. Third-tier parties and beyond have no Miller Act protection.

Within these tiers, the statute covers parties who furnish "labor or material" for the project. Courts have interpreted "material" broadly to include equipment rentals, fuel, consumable supplies, and temporary facilities when they are used primarily for the bonded project. Professional services (engineering, design, testing) receive inconsistent treatment across federal circuits.

For a detailed breakdown of each coverage tier with examples, see our Miller Act coverage tiers guide.

Q5: Who bears the burden of proof in a Miller Act bond claim?

The claimant bears the initial burden of proving four elements: (1) the project is a federal construction project covered by the Miller Act, (2) a payment bond was furnished, (3) the claimant furnished labor or materials for the project, and (4) the claimant has not been paid.

For second-tier claimants, there is an additional burden: proving that proper written notice was sent to the prime contractor within 90 days of the last date of furnishing labor or materials.

Once the claimant establishes these elements, the burden shifts to the surety or the GC to raise defenses. Common defenses include that the work was defective, that the amount claimed is inaccurate, that the claimant is actually third-tier and outside coverage, or that payment was already made.

Q6: Are design professionals (architects, engineers) covered under the Miller Act?

This is one of the most contested coverage questions in Miller Act jurisprudence. The statute covers "labor or material," and courts have debated whether professional design services qualify as "labor" within the statute's meaning.

The prevailing view in most circuits is that design professionals who provide services that are directly integrated into the construction work (shop drawings, field engineering, construction-phase design services) have stronger coverage arguments than those providing pre-construction design services. However, no circuit has provided a bright-line rule. Design professionals on federal projects should consult legal counsel about their specific coverage status before relying on bond claim rights as their sole payment protection.

Notice and Filing Requirements

Q7: What is the notice timeline for Miller Act bond claims?

The Miller Act imposes different notice requirements depending on the claimant's tier.

First-tier claimants (those with a direct contract with the GC) need not provide any notice before filing a bond claim. Their direct contractual relationship with the GC is sufficient.

Second-tier claimants must send written notice to the prime contractor within 90 calendar days of their last date of furnishing labor or materials. The notice must state with substantial accuracy the amount claimed and identify the first-tier subcontractor for whom the work was performed.

Filing timeline for all claimants: No bond claim suit may be filed earlier than 90 days after the claimant's last day of work. The suit must be filed no later than one year after the last day on which labor or materials were furnished for the overall project (not the claimant's specific scope).

Q8: How should the 90-day notice be delivered to ensure compliance?

The statute requires "written notice" but does not mandate a specific delivery method. Best practices based on court decisions:

Certified mail with return receipt requested is the gold standard. The signed receipt provides conclusive evidence of delivery date and recipient identity.

Overnight courier with tracking (FedEx, UPS) provides similar delivery confirmation and is often faster.

Personal delivery with a signed acknowledgment from the GC's representative works but requires careful documentation of who received the notice.

Email is risky as a sole delivery method. While some courts have accepted email notice, others have not directly addressed the question. Never rely on email alone. Send it as a backup alongside a physical mailing.

Fax is similarly risky and increasingly impractical.

The notice should be addressed to the prime contractor's principal office, the project site office, or both. If the GC has a designated agent for notices (specified in the contract documents), send to that agent as well.

Q9: Can you file a Miller Act bond claim AND a mechanics lien on the same project?

On a purely public project (government-owned land and buildings), no. Public property is exempt from mechanics liens, so the payment bond is the exclusive remedy. This is precisely why the Miller Act exists: to replace the lien remedy that is unavailable on public property.

On a bonded private project, yes. Some private project owners or lenders require payment bonds even though the work is on private property. In these cases, subcontractors and suppliers may have both lien rights and bond claim rights. They can pursue both remedies simultaneously, but they cannot recover the same amount twice. Once the debt is satisfied through one remedy, the other is extinguished to the extent of the recovery.

On a project involving both public and private property (such as a mixed-use development on a public-private partnership), the analysis becomes project-specific. Legal counsel should evaluate which remedies apply to which portions of the work.

Bond Claim Process

Q10: How do you find out if a federal project has a payment bond?

Every federal construction project over $150,000 is required to have a payment bond, so the answer is almost always "yes." The practical question is obtaining a copy of the bond and identifying the surety.

From the contracting officer: Any person who has supplied labor or materials for the project can request a copy of the payment bond from the contracting officer. The contracting officer is obligated to provide it. This request can be made in writing to the federal agency that awarded the contract.

From the GC: The prime contractor should provide bond information upon request. If the GC is unresponsive, go to the contracting officer.

From public records: Federal contract awards are published on SAM.gov (System for Award Management) and USASpending.gov. These databases identify the prime contractor but may not include bond details. The bond itself is maintained in the contract file at the awarding agency.

Q11: What documentation should you prepare before filing a bond claim?

Strong documentation is the difference between a claim that gets paid in 60 days and one that drags on for a year. Prepare the following before filing:

A copy of your contract or purchase order with the party that owes you
All invoices submitted and the dates they were submitted
Delivery tickets, time sheets, or other proof of furnishing labor or materials
Payment records showing amounts received and amounts outstanding
All correspondence regarding the payment dispute (emails, letters, meeting notes)
A copy of the 90-day notice (for second-tier claimants) with proof of delivery
Any lien waivers exchanged on the project, to demonstrate which payments were accepted and which remain outstanding
The payment bond itself, or at minimum the surety's name and bond number

Q12: What happens after you file a Miller Act bond claim?

Once the claim is filed as a civil action in federal district court (the district where the project is located), the surety company is served and begins its investigation. The typical process unfolds as follows:

The surety assigns a claims examiner who contacts both the claimant and the GC. The examiner requests documentation from both parties. This investigation period usually lasts 30 to 90 days.

If the claim is straightforward (clear documentation, undisputed amount, GC acknowledges the debt), the surety may pay the claim directly and pursue reimbursement from the GC under the indemnity agreement.

If the claim is disputed (GC contests the amount, claims defective work, or disputes the claimant's tier status), the case proceeds through federal litigation. Mediation is common. Settlement rates on Miller Act claims exceed 70% before trial.

Strategic Considerations

Q13: Does filing a bond claim damage the subcontractor's future relationship with the GC?

This is the pragmatic question that keeps many subcontractors from exercising their legal rights. The honest answer is that bond claims do create tension. GCs track which subs file claims, and some GCs exclude prior claimants from future bid lists.

However, several factors mitigate this concern. First, if a GC is not paying you, the relationship is already damaged. Second, the Miller Act specifically protects the right to file claims, and retaliatory conduct by a GC (blacklisting, bid manipulation) may create additional legal liability. Third, professional GCs distinguish between legitimate claims (where the GC's own payment failure caused the claim) and frivolous or aggressive claims.

The practical advice: exhaust direct negotiation first. Document your efforts. If the GC will not resolve the dispute, file the claim. Protecting your company's financial health is more important than preserving a relationship with a GC who does not pay.

Q14: Can a GC require subcontractors to waive their Miller Act rights?

Federal circuit courts are divided on this question. Some circuits have upheld contractual waivers of Miller Act rights as valid exercises of freedom of contract. Others have struck down such waivers as contrary to the statute's protective purpose.

The safest guidance: subcontractors should resist signing waivers of Miller Act rights. If a subcontract contains such a waiver, the sub should negotiate its removal or consult legal counsel before signing. Even in circuits where waivers are technically enforceable, they may be subject to challenge on unconscionability or public policy grounds.

GCs should be cautious about including such waivers in their subcontracts. If a waiver is later invalidated by a court, the GC gains nothing. If it is enforced, the GC may face reputational consequences and difficulty attracting quality subcontractors on future federal projects.

Q15: How do Miller Act claims affect the GC's bonding capacity?

Every Miller Act claim against a GC's payment bond reduces the GC's available bonding capacity and increases future bond premiums. The surety posts a reserve equal to the estimated claim value, which reduces the GC's aggregate bonding program. Even after the claim is resolved, the claims history follows the GC for three to five years in surety underwriting reviews.

Multiple claims in a short period can trigger a surety review that results in reduced bonding limits, increased premium rates, additional financial reporting requirements, or in severe cases, termination of the bonding program. For GCs whose business depends on federal projects, protecting bonding capacity is a financial imperative that makes prompt subcontractor payment the most cost-effective risk management strategy available.

Frequently Asked Questions

What is the penalty for a federal agency that awards a contract over $150K without requiring a payment bond? There is no penalty for the agency, but the failure to require a bond may give subcontractors and suppliers a direct claim against the federal government for unpaid amounts. Courts have held that when an agency fails to require a bond in violation of the Miller Act, the government may be liable for the amounts that would have been covered by the bond.

Can a surety deny a valid Miller Act claim? A surety can investigate and contest claims but cannot arbitrarily deny valid claims. If a surety wrongfully denies a claim, the claimant can pursue litigation against both the surety and the GC. Courts may award attorney's fees and interest on wrongfully denied claims, though the Miller Act itself does not provide for attorney's fees in all circuits.

Is there a minimum claim amount under the Miller Act? No. The $150,000 threshold applies to the prime contract value, not individual claims. A supplier owed $500 has the same claim rights as one owed $500,000, provided they meet the tier and notice requirements. However, the practical cost of pursuing small claims through federal litigation may exceed the recovery amount, making alternative dispute resolution more appropriate.

Can a payment bond be required on a federal project under $150K? The contracting officer has discretion to require payment protection on contracts between $35,000 and $150,000. This protection may take the form of a surety bond, but alternatives are permitted: an irrevocable letter of credit, a tripartite escrow agreement, or other forms approved by the agency. Below $35,000, no payment protection is required.

How long does it typically take to resolve a Miller Act claim? Resolution timelines vary widely. Simple, undisputed claims may be paid by the surety within 60 to 90 days. Disputed claims that proceed to litigation average 12 to 18 months. Complex cases involving multiple claimants, counterclaims for defective work, or disputes over tier status can extend to two years or more. Mediation, which most federal courts encourage, resolves approximately 70% of contested claims.

Does the Miller Act apply to subcontracts on military construction overseas? The Miller Act applies to construction projects "in the United States." Military construction on overseas bases falls under different statutes and regulations (including FAR 28.102 and DFARS provisions). Coverage varies by location and agreement with the host country. Contractors on overseas military projects should consult the specific contract terms and applicable regulations.

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