TSMC makes promises to Arizona as packaging capacity gathers in Taiwan

The plan on paper and the money approved

TSMC's announced investment plan for Arizona is worth 265 billion dollars. According to a Focus Taiwan report of 26 September, however, Taiwan's Ministry of Economic Affairs has approved applications totalling 44 billion dollars against this plan since December 2020. The approved amount is roughly one sixth of the announced plan. The largest tranche was a 20-billion-dollar capital increase granted in July 2026. That approval covered a 12-inch wafer fab and 1 advanced packaging facility in Arizona.

The gap on its own is not a retreat. Overseas investments from Taiwan are approved tranche by tranche, and in March 2025 TSMC added 100 billion dollars to its plan, targeting 6 advanced fabs, 2 packaging facilities and 1 research centre. Even the number of approvals is unclear. On 2 July Focus Taiwan described the 20-billion-dollar approval as the sixth, while on 26 September it referred to 7 applications in total. The real yardstick is the Taiwanese side of the same ledger. The company operates 19 advanced facilities on the island and is building 13 new fabs and packaging plants. TSMC raised its 2026 capital expenditure guidance from 52–56 billion dollars in April to 60–64 billion dollars. In other words, a single year's spending budget exceeds the 44 billion dollars approved for the US over roughly 6 years.

The bottleneck is packaging, and it is growing in Chiayi

Advanced packaging is the production stage that combines several chips in a single package to raise the performance of AI accelerators. Its most sought-after form is CoWoS, the TSMC technique that places a processor and high-bandwidth memory (HBM) on the same substrate. According to a Taipei Times report of 28 September, Taiwan's National Science and Technology Council has launched a 1-month public consultation on the 198.65-hectare third phase of Chiayi Science Park. TSMC plans 5 additional packaging plants there. Together with 2 facilities in the first phase and 3 in the second phase due by 2031, the park's total will rise to 10.

The comparison is striking. The Arizona plan includes 2 packaging facilities, while the target in Chiayi is 10 facilities in a single park. According to the Taipei Times, the demand comes from CoWoS orders placed by Nvidia, AMD and Apple. The memory side pulls in the same direction. A Seoul Economic Daily report of 20 September said Samsung will raise monthly HBM wafer starts from about 180,000 to 250,000, and the share of the HBM4 family will rise from 40% to 80%. Our reading is this: the more HBM output grows, the heavier the load on the CoWoS line that joins this memory to the processor. As of 2026, the weight of that line sits in Taiwan.

Summit uncertainty feeds concentration

The Xi–Trump summit ended on 24 September without a joint statement. According to NBC News, the tariff truce was extended to 10 January instead of 10 November, but no change to chip export controls was announced. A Focus Taiwan report of 25 September said Xi asked the US to oppose Taiwanese independence; Taipei rejected the call the same day. The summit produced no decision on the 14-billion-dollar US arms package, which has been pending since May.

In the same week Taipei turned to its own capacity. According to a Taipei Times report of 28 September, the Ministry of National Defense has prepared a programme for about 200 Hsiung Feng anti-ship missiles. It is worth 22 billion NT dollars (692.3 million US dollars) and runs over 2027–2035. In Washington, Congress is hardening its stance. A Roll Call report of 23 September said the Senate's 2027 defence bill package contains 3 chip bills, one of which writes an 18-month ban on the most powerful AI chips into law.

Our reading is that these two trends reinforce each other. As US security support turns into a bargaining chip, as the 14-billion-dollar package illustrates, Taipei's incentive to keep its most critical production on the island grows. This incentive is known as the "silicon shield": the assumption that keeping production the world cannot do without on the island secures outside support. That is why the gap between 265 billion and 44 billion dollars may not close before 2027. The other side of the risk is equally clear. In a blockade or a crisis in the Strait, the global supply of AI chips would depend on a single park that is set to host 10 packaging facilities.

What to watch over the next 3 months

The first indicator is the approval list of Taiwan's Ministry of Economic Affairs. If a new application for the second packaging facility in Arizona follows the 20-billion-dollar tranche of July 2026, the plan on paper moves closer to reality. The second indicator is the Chiayi timetable. The 1-month public consultation will be followed by a feasibility study and approval from the Executive Yuan; if these steps accelerate, the concentration thesis strengthens. The third indicator is 10 January. If the truce is again extended for only a short period on that date, chips and Taiwan will have been deferred once more. The fourth indicator is the yuan. USD/CNY closed at 6.7132 on 25 September; a sustained move above 6.80 would show that trade tensions are being repriced. Finally, the start date of volume production at the first-phase facilities should be tracked. The Taipei Times says June 2026 while BigGo gives 2027; until this contradiction is resolved, Chiayi's actual capacity could not be verified.