What is the 55% domestic content threshold under BABA?

The 55% domestic content threshold is the line a manufactured product has to clear to count as domestic under Build America, Buy America. Put plainly, more than 55 percent of the product's total component cost has to come from components mined, produced or manufactured in the United States. Miss it and the product is non-compliant on its face, even if it was assembled in an American factory. This guide covers the number itself, the escalating threshold it gets confused with, and the one date in 2026 that genuinely changes who the test applies to.

What the threshold actually measures

The 55 percent is a share of component cost, not of the finished product's price. You take the cost of the US-origin components, divide by the total cost of all components, and compare to 55 percent. Assembly labour, overhead and profit are not components and sit outside the sum. Our guide on how domestic content is calculated walks the arithmetic in full.

It only applies to manufactured products

This is the part teams most often get wrong. The 55 percent threshold is specific to the manufactured-products category. Iron and steel products are judged all-or-nothing, with every manufacturing step required to happen in the United States, and construction materials use their own pass-or-fail standard. Applying a percentage to a steel beam is a category error. Confirm the category first, then reach for the number.

No, the 55 percent is not scheduled to rise

This is the most common piece of misinformation about BABA, and it comes from mixing up two domestic-content regimes that use similar language and different numbers. The Buy American Act, which governs what the federal government buys directly for itself, is on a published escalating schedule. Build America, Buy America, which governs federally-funded infrastructure built by somebody else, sits at greater than 55 percent with no scheduled increase. If you are a contractor on a grant-funded water or highway project, BABA is your regime and 55 percent is your number.

A manufactured product is produced in the United States if the cost of the components of the product that are mined, produced, or manufactured in the United States is greater than 55 percent of the total cost of all components. (BABA standard, per OMB M-24-02 and 2 CFR 184.3)

What 1 October 2026 actually changes

There is a real date, and it is about WHO the test applies to rather than what the number is. FHWA ran a general waiver from 1983 that exempted manufactured products from Buy America on federal-aid highway projects entirely. A final rule published on 14 January 2025 terminated it and phased the requirement in. Projects obligated on or after 1 October 2025 must have their manufactured products assembled in the United States, with no component-cost test. Projects obligated on or after 1 October 2026 must meet that final assembly requirement and the greater-than-55-percent component-cost test.

So the same traffic signal controller, on the same shelf, is compliant on a highway project obligated in September 2026 and non-compliant on one obligated in October 2026. What governs is the date your federal funds were obligated, not the date you run the check. The threshold matrix shows the phase schedule alongside the standard, read from the same ruleset the calculator uses so the two cannot drift apart.

A quick sanity check

Knowing your percentage precisely beats assuming it, because the test is unforgiving at the line: greater than 55 percent means a product at exactly 55.0 percent fails. Headroom above the number is worth having for the ordinary reason that component costs move between quote and delivery, not because the threshold is going to move. The OMB Made in America Office is the authority on the governing standard.