Taiwan’s Packaging Monopoly Is the Real AI Chokepoint
Nvidia has locked up majority capacity at TSMC's advanced packaging facilities through 2026, exposing a critical blind spot in US industrial policy and revealing that chip assembly—not fabrication—now limits AI deployment.
Nvidia has secured over 50% of TSMC’s advanced packaging capacity through 2026, creating a bottleneck that limits AI accelerator availability even as global wafer fabrication expands. The constraint is CoWoS (Chip on Wafer on Substrate), a specialised assembly process that transforms raw silicon wafers into deployable AI chips by stacking logic dies with high-bandwidth memory. TSMC is the only mass-market provider of this technology, and demand has outstripped supply for two consecutive years.
This concentration of packaging power in a single vendor located in a geopolitically contested region creates systemic risk that recent US industrial policy failed to address. The CHIPS Act allocated $50 billion to domestic wafer fabrication but only $3 billion to Advanced Packaging, according to Congressional Research Service analysis. The US Department of Commerce acknowledged that “advanced packaging is the current state of the art, but the U.S. has little to no capacity for advanced packaging at present.”
Google Cuts Production Target as Nvidia Locks Capacity
The constraint is already affecting deployment schedules. Google reduced its 2026 TPU production target from 4 million to 3 million units due to limited access to TSMC’s CoWoS capacity, per Korea Economic Daily. Nvidia booked an estimated 800,000 to 850,000 wafers of TSMC’s 2026 CoWoS capacity, clearing the path for Blackwell Ultra and Rubin architectures while crowding out competitors.
“Our CoWoS capacity is very tight and remains sold out through 2025 and into 2026.”
— C.C. Wei, TSMC CEO
The top four AI chip designers consumed approximately 90% of global CoWoS capacity and HBM supply in 2025 while accounting for only 12% of advanced logic die production, according to Epoch AI. This reveals packaging as a tighter constraint than wafer fabrication itself—a counterintuitive dynamic given that fabrication has dominated policy discussions and capital allocation.
Taiwan’s Irreplaceable Role Beyond Fabrication
TSMC roughly doubled its CoWoS capacity from 35,000 wafers per month in late 2024 to 80,000 by end of 2025, with plans to reach 130,000 wafers per month by end of 2026, per Tom’s Hardware. Despite this 63% year-over-year expansion, capacity remains oversubscribed through at least mid-2026 according to management guidance cited by Fusion WW.
Taiwan produces around 90% of the world’s most advanced chips smaller than 10 nm and Taiwanese companies represent approximately 57% of worldwide chip packaging and testing revenue, according to Everstream Analytics. This concentration makes Taiwan a single point of failure for AI Infrastructure beyond its already-critical role in fabrication.
The packaging gap is particularly visible in US policy execution. TSMC’s Arizona Fab 21 produces 4nm and 5nm wafers domestically, but those wafers are shipped back to Taiwan for final assembly. TSMC plans to move advanced packaging tools into Arizona in late 2027 with production starting in 2028, leaving a 1.5 to 2-year window where domestic fabrication exists without domestic packaging capability.
The CHIPS Act’s Missing Link
While wafer fabs received tens of billions in investment under the CHIPS Act, advanced packaging saw comparatively modest allocation despite being equally critical to semiconductor performance. Analysis by industry observers notes that backend bottlenecks—packaging, masks, substrates—have become the new constraint as wafer output expanded, yet policy priorities remained focused on fabrication capacity.
- Nvidia secured 70% of TSMC’s 2025 CoWoS capacity and over 50% for 2026, creating a structural bottleneck for competitors
- Google cut 2026 TPU production by 25% due to packaging constraints despite adequate wafer supply
- US CHIPS Act allocated $3 billion to packaging versus $50 billion to fabrication, leaving the critical assembly chokepoint in Taiwan
- TSMC Arizona wafers are shipped to Taiwan for packaging until domestic facilities come online in 2028
The mismatch between fabrication investment and packaging capacity means that even if the US achieves domestic wafer production at scale, final assembly remains concentrated in a single facility in Taiwan. This creates residual geopolitical risk that defeats the strategic intent of supply chain diversification.
What to Watch
TSMC’s 2026 capacity expansion to 130,000 wafers per month will determine whether packaging constraints begin to ease or whether Nvidia’s priority allocations continue to crowd out other AI chip designers. Intel and Samsung are developing alternative packaging technologies, but neither has demonstrated CoWoS-equivalent capability at scale. The timeline for TSMC Arizona’s packaging facility—tool move-in late 2027, production 2028—sets the earliest date for meaningful reduction in Taiwan dependency. Any acceleration or delay in that schedule will signal whether US industrial policy can close the packaging gap before geopolitical risk materialises. Monitor whether AMD, Google, and other hyperscalers secure dedicated packaging capacity or remain dependent on TSMC’s oversubscribed allocation system through 2027.