Although not disclosed yet, a sweeping US-Taiwan trade bargain could propel TSMC’s Arizona ambitions to $465 billion, reshaping tariffs, fabs and supply-chain strategy.
Taiwan Semiconductor Manufacturing Company (TSMC) is preparing a significant expansion of its US manufacturing footprint, with plans that could lift its total investment in Arizona to as much as $465 billion. The move is reportedly linked to a proposed US-Taiwan trade arrangement that would reduce tariffs on Taiwanese exports to 15%.
According to Reuters, citing the New York Times, the package is still under negotiation. A separate Reuters update mentioned that Taiwan and the US have reached a broad consensus on tariff talks and are working towards a final meeting. Neither TSMC nor US officials have confirmed the figures or timelines, though.
If approved, the plan would see TSMC add at least five new semiconductor fabs in Arizona. This would be in addition to projects already announced. The overall roadmap could rise to about 11 fabs, supported by two advanced packaging plants and a local research and development centre.
However, details on process technologies for any additional facilities remain undisclosed.
At present, TSMC has formally committed $165 billion to Arizona. This includes an extra $100 billion announced in March 2025, on top of an earlier $65 billion pledge. The first Arizona fab began high-volume production on its N4 process in late 2024. A second fab is structurally complete and is targeting N3 production in 2028. A third facility, which started in April 2025, is planned for N2 and A16 nodes by the end of the decade.
TSMC has also positioned itself for further growth. It recently acquired around 900 acres (about 364.217 hectares) of adjacent land near its north Phoenix site for roughly $197 million. This provides space for future facilities, but land is unlikely to be the main constraint.
Meanwhile, scaling to 11 fabs would place pressure on labour, equipment and utilities. Lead times for critical tools, especially EUV lithography, remain long. Demand for advanced packaging skills, power and water would intensify across the Phoenix region.
The reported tariff linkage adds political weight to the expansion. For TSMC, however, attention will remain on near-term signals. Permits, construction schedules and capital guidance will be closely watched. Its next quarterly update, due on 15 January 2026, may offer early clues on whether these plans move from speculation to commitment.
