Each 1% tariff hike could add US$3.5B to US fab costs, SIA warns

The 21% figure is the real story, not the $3.5B. It exposes the most fragile layer beneath America's reshoring narrative: materials. Photoresist, specialty gases, high-purity targets remain locked into Japan, Germany, and Taiwan, China, with no credible domestic substitute within three years. The technical cascade is systemic, not point-specific. A tariff step-up inflates the entire BOM simultaneously, from Kr/Xe gas for EUV lithography to CMP slurry. With Shin-Etsu commanding over 60% of the photoresist market, the tariff premium gets passed through, not absorbed by equipment makers. The CHIPS Act's $52.7B subsidy logic rests on a controllable domestic cost base. Once tariffs erode that margin, IRR models for Arizona, Taylor, and Ohio fabs get repriced, and capacity ramp timelines slip past 2027. The competitive game is subtler. ASML and Applied Materials face a pincer: US customers demanding price concessions while non-US markets add tariff friction. Meanwhile, Japanese and Korean material suppliers may accelerate Southeast Asia capacity shifts to dodge tariffs, undermining the friend-shoring premise itself. 12-24 month call: that 21% ratio will likely decline, not rise. Firms will source from zero-tariff origins rather than domestic ones. Material fab build-out cycles of three to five years dwarf policy cycles. SIA is essentially doing the taxpayer's math: the bill for decoupling lands squarely on American consumers.