Federal-aid highway contractors face a hard shift on October 1, 2026, when FHWA's Buy America rules require manufactured products to clear a domestic component cost threshold above 55%, on top of US final assembly. Missing that bar can mean rejected materials, project delays, and re-sourcing costs no schedule can absorb. The deeper exposure is documentation: proving domestic content across every supplier and BOM line, on demand, under audit. Manual certificate chasing and spreadsheet tracking rarely survive that scrutiny, which is why BABA readiness for contractors now depends on continuous, evidence-backed compliance instead of end-of-project scrambles. This contractor BABA readiness guide breaks down the FHWA Buy America deadline 2026, what qualifies under domestic content compliance, and how to build audit-ready supplier documentation before obligation dates hit. It also shows where compliance automation and CORA-driven compliance intelligence replace fragile manual workflows.