On October 1, 2026, Federal Highway Administration Buy America rules reach their strictest phase. Every manufactured product on a federal-aid highway project obligated on or after that date must clear the BABA 55% domestic component cost test on top of U.S. final assembly. The exposure is concrete: a product at exactly 55.0% fails, and one supplier price increase or a single substituted foreign part can push a previously compliant product under the line with no warning. For manufacturers of lighting, ITS/TMS equipment, guardrail, signage, and precast components, that turns domestic content compliance into a moving target measured across every distinct bill of materials, not once per project.
This worked example on the BABA 55% domestic component cost test breaks the calculation down component by component: what counts, what is excluded (final assembly labor, product-level overhead, and profit), how to value purchased versus in-house components, and why an imported subassembly counts in full as a single foreign component. It also covers the documentation that substantiates the ratio for an FHWA or recipient audit. The Build America, Buy America framework and BOM-level compliance tracking show how CORA-powered regulatory intelligence keeps the 55% calculation current as supplier costs and origins shift. Certivo, an AI-native compliance platform and system of record, calculates domestic content at the BOM level and flags the components that tip a product under the threshold.
See the complete worked example : https://www.certivo.com/blog-details/how-to-calculate-baba-s-55-domestic-component-cost-a-worked-example
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