TSMC's Arizona mega-fab costs US$165 billion and still runs 30% dearer than Taiwan

TSMC's Arizona complex has become one of the most expensive industrial builds ever attempted: NT$5.2 trillion (US$165 billion) across a 1,149-acre site north of Phoenix. One fab is already producing chips, two more are under construction, and when the site is fully built out TSMC expects nearly a third of its most advanced chips to be made in the US.

The decision to reshore was strategic — driven by Washington's push and by US customers like Apple, NVIDIA, AMD and Qualcomm that wanted domestic supply. But the cost of making that decision work on American soil has been far above a Taiwanese build. Operations are reported to cost roughly 30% more than comparable Taiwan sites, driven by higher tariffs and transport costs for importing materials from home.

The overrun is not only money. Permitting takes at least twice as long as in Taiwan, and TSMC was forced to help draft about 18,000 technical rules to meet local requirements at a cost of NT$1.1 billion. A shortage of skilled workers pushed the company to import hundreds of technicians from Taiwan, which triggered lawsuits from US workers and backlash from local unions.

The project secured NT$207.9 billion in federal CHIPS Act subsidies, but the episode is a case study in a decision made strategically and paid for operationally: the incentives cover building the plant, not running it at a permanently higher cost in a market with fewer of the skills and suppliers the model was built on.