Short answer: it depends on your project's obligation date, not on when you ship the product or sign the contract. The Build America, Buy America Act (BABA) 55% rule that takes effect on October 1, 2026 applies to manufactured products permanently incorporated into Federal-aid highway projects that are obligated on or after that date. If your project was obligated earlier, a different domestic-content test applies, or none at all.

This guide gives procurement, contract, and compliance teams a clear scoping decision path before you spend budget re-sourcing components that may not be in scope. For a fuller framework overview, see Certivo's Build America, Buy America Act framework page.

If you are unsure where your portfolio stands, you can start with a compliance risk assessment to map which product lines and projects fall inside the new requirements.

Key Takeaways

📌 The BABA 55% rule applies to manufactured products in FHWA Federal-aid projects obligated on or after October 1, 2026.

⏳ Scope is set by the project obligation date (the FHWA construction authorization, or E-76), not the ship date or contract signature date.

📊 BABA splits products into three categories, each with a different test: iron and steel, manufactured products, and construction materials.

⚠️ Misclassifying a product across those categories changes which domestic-content test applies and can create a false sense of compliance.

🔗 FHWA runs its own Buy America program under 23 U.S.C. 313; other federal agencies implement BABA under 2 CFR Part 184 with separate timelines and waivers.

🏭 Suppliers to lighting, traffic systems, ITS/TMS equipment, and similar categories are among the most affected.

🤖 At portfolio scale, tracking which SKUs are in scope across many projects with different obligation dates is a data problem, not a one-time review.

What the October 1, 2026 BABA 55% Rule Actually Changes

On January 14, 2025, the Federal Highway Administration (FHWA) published a final rule that terminated its longstanding general waiver for manufactured products and set new Buy America requirements at 23 CFR 635.410. The rule took effect in March 2025, but it phases in by project obligation date, per the FHWA final rule in the Federal Register (90 FR 2932).

There are two phases:

• October 1, 2025 (final assembly requirement): Manufactured products must be manufactured (final assembly) in the United States.

• October 1, 2026 (55% requirement): Manufactured products must be assembled in the United States and have more than 55% of total component cost, by value, from components mined, produced, or manufactured in the United States.

The U.S. GAO major-rule report (B-337017) confirms both phase-in dates. For the wider 2026 picture, Certivo's guide on Buy America Act compliance in 2026 covers preparation steps beyond scoping.

The Three BABA Categories and Their Different Tests

BABA does not treat every item the same way. Before you can answer "does BABA apply to my product," you have to classify each item into one of three categories, because each carries a different domestic-content test. Getting the category right is the single most important scoping step, and it is where the distinctions in Certivo's Buy American vs Buy America vs BABA breakdown become practical.

Iron and Steel

For iron and steel products, all manufacturing processes must take place domestically, including any coating application. This standard is not new and is not subject to the 55% cost test.

Manufactured Products

This is the category the October 1 rule reshapes. A manufactured product is an item processed into a specific form and shape, or combined with other items, and delivered to the work site in that form. From October 1, 2026, it must clear both the final assembly and the 55% component-cost tests.

Construction Materials

Construction materials (for example non-ferrous metals, plastic and polymer-based products, glass, lumber, drywall, and engineered wood) follow the OMB standard in 2 CFR Part 184: every manufacturing process must occur in the United States. There is no 55% cost test for this category. A product wrongly placed here would face the wrong test entirely.

BABA category tests for iron steel manufactured products and construction materials

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The Trigger That Trips Most Suppliers: Project Obligation Date, Not Ship Date

The most misunderstood part of the rule is the trigger. Coverage is decided by when the project is obligated, meaning when FHWA obligates federal funds to the construction phase, evidenced by the Authorization to Proceed (Form E-76). It is not decided by when you deliver the product or invoice the buyer.

FHWA states that projects obligated before the phase-in dates are not subject to the new requirements, because the point of obligation is when federal requirements, including Buy America, attach to a project. This is documented in the FHWA Manufactured Products Final Rule Q&A.

This is exactly the nuance Certivo's public infrastructure procurement guide under BABA addresses for recipients and their suppliers.

Contract Date vs. Obligation Date: Why Signing Before October 1 Does Not Exempt You

A common assumption is that a contract signed before October 1, 2026 locks in the older, lighter requirement. That is not how FHWA scopes it. The controlling event is the federal obligation of construction funds, not the date the prime contractor and supplier signed a purchase order or subcontract.

If the contract was executed earlier but the project obligates federal funds on or after October 1, 2026, both tests apply to the manufactured products going into that project. Conversely, a later contract on a project already obligated before the trigger date does not pull those products into the new requirement. When the same SKU ships to multiple projects with different obligation dates, the same part can be in scope on one job and out of scope on another. This split-scope reality is part of why domestic-content tracking is becoming heavier work, a theme Certivo covers in how tariffs and reshoring are increasing material compliance workloads.

How to Find Your Project's Obligation Date

Suppliers rarely see the E-76 directly, so obligation dates usually come from upstream. Practical steps:

1. Ask the funding recipient or prime contractor for the construction-phase Authorization to Proceed (E-76) date for the specific project.

2. Confirm it is the construction phase, not preliminary engineering or right-of-way. Buy America for construction materials and products attaches to the construction authorization.

3. Get it in writing and tie it to the contract or project number, so the obligation date travels with your compliance evidence.

4. Flag mixed-funding projects. Where a NEPA-defined project mixes federal and non-federal phases, Federal-aid requirements can still reach non-federal work under 23 U.S.C. 313. Confirm scope with the recipient.

Classification Pitfalls That Change Which Test Applies

Because each category carries a different test, a classification error is a compliance error. Two pitfalls recur:

Manufactured product misfiled as a construction material. These face different standards. A manufactured product must meet the 55% component-cost test from October 1, 2026; a construction material must have all manufacturing processes in the U.S. and has no cost test. Filing an item in the wrong bucket produces attestations against the wrong requirement.

Excluded materials and mixtures. Certain inputs (for example cement, cementitious materials, and aggregates) are treated as excluded materials. Under 23 CFR 635.410(c)(1)(iv), mixtures of excluded materials delivered to a work site without final form are not classified as manufactured products and are not subject to the manufactured-products requirements.

Accurate classification depends on knowing what each product is made of, which is fundamentally a bill-of-materials exercise. Certivo's track compliance by BOM use case shows how BOM-level material mapping supports correct category assignment and, in turn, correct attestations.

BABA product scoping decision path for manufacturers and procurement teams

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Are There Exceptions? De Minimis, Small Grants, and Product-Specific Waivers

BABA and FHWA guidance recognize limited exceptions, but they are narrow and often agency-specific:

• De minimis: A cumulative portion of non-compliant items may be permitted, generally up to a small percentage of covered project costs with a dollar cap. Confirm the exact figure with your funding agency.

• Small grants: Projects at or below the applicable Simplified Acquisition Threshold may fall outside BABA. That threshold is updated periodically, so verify the current value.

• Product-specific and public-interest waivers: Agencies can issue targeted waivers where domestic products are unavailable or non-competitive.

Based on currently available regulatory guidance, FHWA added de minimis and small-grant Q&As to its Buy America materials, and these provisions should be confirmed against current FHWA Buy America guidance and your State DOT. Do not assume a general BABA waiver from another agency applies to an FHWA Federal-aid project.

Does This Apply Outside FHWA?

Not identically. FHWA administers its own Buy America program under 23 U.S.C. 313 and 23 CFR 635.410, with the phase-in dates described above. Other federal agencies implement the broader BABA Buy America Preference through OMB's 2 CFR Part 184, each with its own effective dates, guidance, and general applicability waivers.

For manufacturers selling into transit (Federal Transit Administration), water, energy, broadband, or building programs, the category tests are similar in spirit, but the timelines, thresholds, and waivers can differ. The strategic risk of assuming one agency's rule fits another is a recurring theme in Certivo's analysis of where compliance breaks down across global supply chains. Suppliers into government programs should map each program separately, as outlined for government and public sector manufacturers.

A Practical Scoping Decision Path

Use this sequence for each product and project combination:

1. Federal-aid? Confirm the project uses Title 23 (FHWA) funds. If not, this specific rule may not apply.

2. Obligation date? Get the construction-phase E-76 date. Compare it to October 1, 2025 and October 1, 2026.

3. Category? Classify the product as iron/steel, manufactured product, or construction material.

4. Test? Apply the correct standard for that category and obligation window.

5. Exceptions? Check de minimis, small-grant, or waiver eligibility with the recipient or FHWA.

6. Document. Retain the obligation date, classification rationale, and supplier attestations as audit-ready evidence.

This is the upstream work that has to happen before proving compliance, and it aligns with a proactive posture rather than a reactive one, as described in Certivo's manage compliance risk proactively use case.

Managing Scope at Portfolio Scale

For a single product on a single project, this analysis is a spreadsheet exercise. For a manufacturer selling hundreds of SKUs into dozens of Federal-aid projects, each with its own obligation date and category mix, it becomes a data problem. The same part can be in scope on one project and out of scope on another, and the answer changes as new projects obligate.

This is where Certivo functions as the system of record for product compliance. The platform maps products to the correct BABA category at the BOM level, links each SKU to project-specific obligation dates, and flags which items on which projects fall under the final assembly and 55% tests. CORA-powered regulatory intelligence tracks the underlying requirements and updates, so scoping stays current rather than being re-run manually each quarter. The goal is not to eliminate compliance risk, but to reduce surprises, speed evidence retrieval, and keep declarations audit-ready. See the Certivo platform features and the trade and customs compliance solution for how this fits a broader domestic-content program.

To see where your portfolio stands against the October 1, 2026 trigger, book a compliance risk assessment and get a view of which SKUs and projects are in scope.