49 CFR 661 Buy America: Content Test, Waivers, and Audits

49 CFR Part 661, the Federal Transit Administration’s Buy America rule, requires that rolling stock bought with FTA funds contain more than 70 percent U.S.-made content by cost and undergo final assembly in the United States. It applies to every FTA grant recipient and flows down through every contractor and subcontractor. Purchases at or below $150,000 are exempt by statutory waiver; everything above that must comply in full or secure a waiver.

What the Rule Covers and Who Has to Follow It

The regulation reads “rolling stock” broadly. It covers buses, vans, railcars, locomotives, trolley cars, trolley buses, ferry boats, and support-service vehicles.¹ Train control, communication, and traction power equipment procured alongside those vehicles are covered as well.²

Under the FAST Act, a general public interest waiver exempts all purchases of $150,000 or less from Buy America, regardless of the size of the underlying project.³ That floor is fixed by statute and will not rise with the federal simplified acquisition threshold.

The grantee — usually a transit agency — carries the primary compliance burden. It must put a Buy America notice in every bid solicitation covered by the rule and require a Buy America certificate from each bidder as a condition of a responsive bid.⁴

The Two-Part Compliance Test

A rolling stock procurement has to pass two tests at the same time. Failing either one means the bid does not comply, and the manufacturer must either obtain a waiver or lose the award.

Domestic Content of More Than 70 Percent

The cost of components and subcomponents produced in the United States must exceed a minimum percentage of the total cost of all components. For any procurement initiated in fiscal year 2020 or later, that threshold is more than 70 percent.⁵ The current level was phased in under the FAST Act.⁶

Final Assembly in the United States

Final assembly of the vehicle must take place in the United States.⁵ Final assembly means creating the finished vehicle from individual elements through real manufacturing processes, not bolting together pre-assembled modules shipped in from abroad.

The regulation sets minimum assembly activities for each vehicle type. A new rail car generally requires U.S. installation and interconnection of propulsion controls, braking, auxiliary power, HVAC, communications, motors, wheels and axles, suspensions and frames, plus in-plant testing. A new bus requires U.S. installation of the engine, transmission, axles, cooling and braking systems, HVAC, pneumatic and electrical systems, doors, seating, grab rails, destination signs, wheelchair lifts, and road testing before delivery.⁷ A manufacturer whose process falls short of those minimums can ask FTA for a case-by-case determination.

How Domestic Content Is Calculated

The math is where most compliance work happens, and every dollar figure is auditable.

Components and Subcomponents

A component is any article incorporated directly into the finished vehicle at the final assembly location. A subcomponent is incorporated into a component rather than into the vehicle itself.⁸ The rule only reaches two levels down. Raw materials that go into subcomponents are not tracked.

A component counts as “manufactured” only when its subcomponents have been substantially transformed into a functionally different article. Bolting parts together without changing their function does not qualify.⁸ A component can be manufactured at the final assembly plant, but only if the component manufacturing is a separate and distinct process from the vehicle assembly.

When a Component Qualifies as Domestic

For a component to count as domestic, it must be manufactured in the United States and more than 70 percent of its subcomponents by cost must themselves be of domestic origin. FTA extended the same phased threshold to the subcomponent level within each component.⁹ A subcomponent is domestic if it is manufactured in the United States.⁸

The result is an all-or-nothing rule at the component level. If a component clears the threshold, its entire cost counts as domestic in the overall vehicle calculation. If it falls short, the entire cost counts as foreign. No partial credit.⁸

What Goes Into Cost

The cost of a component or subcomponent is what the bidder pays a subcontractor or supplier for it. Transportation to the final assembly location is included in the cost of foreign components and subcomponents. If the bidder makes the component itself, cost includes labor, materials, an allowance for profit, and attributable overhead.⁸ Labor for final assembly of the vehicle is excluded from the calculation entirely.⁵ It is actual cost that matters, not the bid price.

Car Shells and Frames Above $300,000

Where the average vehicle cost exceeds $300,000 and the car shells or frames are not produced in the United States, U.S.-produced steel or iron used in those foreign shells or frames still counts toward domestic content.⁵

Certifications and Audits

Every bidder must submit a Buy America certificate with its bid. There are two forms: a Certificate of Compliance, in which the bidder commits to meeting both the content and final-assembly requirements, and a Certificate of Non-Compliance, in which the bidder acknowledges it cannot meet them but may seek a waiver.² Submitting neither, or both, makes the bid nonresponsive.

A bidder who makes an inadvertent or clerical error, such as checking the wrong box, has ten days after bid opening to submit a sworn written explanation with supporting evidence to the FTA Chief Counsel. The grantee cannot award the contract until the Chief Counsel rules on the correction. Claiming ignorance of how Buy America works does not count as an inadvertent error.⁴

The certification, once submitted, locks the bidder in. In sealed-bid procurements, the original certification controls. In negotiated procurements, the certification with the final offer controls. A bidder that certifies compliance cannot later seek a waiver.⁴

Pre-Award and Post-Delivery Audits

Grantees must run both a pre-award and a post-delivery audit for every rolling stock procurement. The pre-award audit verifies the manufacturer’s compliance plan before award. The post-delivery audit confirms the manufacturer delivered what it promised.¹⁰ Both involve reviewing itemized component and subcomponent lists, confirming countries of origin, and verifying the domestic content math. Grantees should keep the documentation for later FTA review.

Waivers

The FTA Administrator can waive Buy America in three situations.

Public interest waiver. Applied when compliance would be inconsistent with the public interest. This is the broadest and most discretionary category, and FTA has used it to create categorical exemptions such as the $150,000 small purchase waiver.¹¹
Non-availability waiver. Applied when the required materials are not produced domestically in sufficient and reasonably available quantities or at a satisfactory quality.¹¹
Unreasonable cost waiver. Applied when including a domestic item would raise the contract cost by more than 25 percent. The test is the lowest responsive bid with a foreign item multiplied by 1.25, compared to the lowest responsive bid with a domestic item; if the domestic bid is higher, the waiver applies.¹¹

Before granting any waiver, FTA must publish a detailed written explanation in the Federal Register and on DOT’s website, then allow a reasonable comment period.⁵ FTA also reports all waivers granted each year to Congress. There are no quiet waivers.

What Noncompliance Costs

If a winning bidder cannot back up its certification, the regulation first requires corrective action with no increase to the original bid price. A manufacturer cannot certify, win on price, and then renegotiate when domestic sourcing turns out to cost more.¹² If the manufacturer refuses to correct and the contract has not been awarded, it loses the award. If the contract has already been signed, the manufacturer is in breach.

Willful refusal to comply can trigger debarment or suspension, cutting the manufacturer off from all federal contracts and financial assistance government-wide.¹³ Debarment typically runs three years and can rest on the agency’s own evidence of fraud, false statements, or nonperformance.¹⁴ For the grantee, noncompliance puts FTA funding at risk; the agency can withhold funds or demand repayment of amounts already disbursed.

What Build America, Buy America Changed

The Build America, Buy America Act (BABA), enacted with the 2021 Infrastructure Investment and Jobs Act, set up a broader government-wide domestic preference framework. It did not replace the FTA rolling stock rules. FTA’s existing standards for iron, steel, and manufactured products remain in force.¹⁵ BABA’s main effect on FTA-funded work is adding domestic preference requirements for construction materials and introducing additional waiver procedures. For rolling stock, 49 CFR Part 661 and 49 USC 5323(j) still govern.

1
eCFR. 49 CFR 661.3 – Definitions
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eCFR. 49 CFR 661.12 – Certification Requirement for Procurement of Buses, Other Rolling Stock and Associated Equipment
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Federal Transit Administration. FTA Issues Guidance Letter on Buy America Small Purchase Waivers
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eCFR. 49 CFR 661.13 – Grantee Responsibility
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Office of the Law Revision Counsel. 49 USC 5323 – General Provisions
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Federal Transit Administration. FTA Issues Final Buy America Policy for Phased Increase of Domestic Content for Procurement of Transit Rolling Stock
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eCFR. 49 CFR 661.11 – Rolling Stock Procurements
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eCFR. 49 CFR 661.11 – Rolling Stock Procurements
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Federal Register. Notice of Policy on the Implementation of the Phased Increase in Domestic Content Under the Buy America Requirements
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Federal Transit Administration. Conducting Pre-Award and Post-Delivery Audits for Rolling Stock Procurements
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eCFR. 49 CFR 661.7 – Waivers
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eCFR. 49 CFR 661.17 – Failure to Comply With Certification
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eCFR. 49 CFR 661.19 – Sanctions
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U.S. Department of Transportation. Suspension and Debarment
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Federal Transit Administration. Buy America