TSMC's Taiwan fabs stop for 90 days over military action

Current status (as of 16 Oct 2026)

• Nothing has stopped yet. TSMC reported a record Q3 2026 on 15 Oct 2026: revenue NT$1,494.24B, and it guided Q4 revenue to US$52–54B (pr.tsmc.com/english/news/3346). Its Taiwan fabs are running normally.
• The 2026-12-31 entry is zero. A qualifying stoppage would have had to start by about 2 Oct 2026, and none did.
• Pressure on Taiwan is rising, but stays below a blockade.
  • China's coast guard ran a special operation east of Taiwan in June 2026 and hailed 198 ships. It began new patrols in July. A militia boat was seen off the east coast. China warned Taiwan to "bear the consequences" after a water-cannon incident at Pratas. A Chinese carrier group is in the western Pacific.
  • None of this interdicts shipping. There have been no full war games around Taiwan since Justice Mission 2025 in December 2025 (Taipei Times, 13 and 15 Oct 2026; RealClearDefense, 4 Aug 2026; Reuters, 4 Jul 2026).
• Near-term risk looks lower.
  • US officials told Reuters (1 Oct 2026) that a Chinese invasion before 2028 is "increasingly unlikely." Their reasons are China's military purges (two of the top military commission's seven seats are filled) and Beijing waiting on Taiwan's January 2028 election. If the governing DPP wins again, "2028 becomes pretty sporty."
  • Trump and Xi met in May and September 2026 and are due to meet again in November and December.
  • Polymarket prices an invasion by end-2027 (any inhabited Taiwan-held territory) at about 10%, down from 27% in March. By end-2026 it is about 2%. Long-dated long shots on Polymarket are usually overpriced.

Reference class and base rate

China has not carried out a major military campaign against Taiwan since 1958. Experts and markets mostly treat a blockade as more likely than an invasion. I estimate the chance that China starts an invasion or full blockade of Taiwan's main island by mid-2031 at about 10%. I assume roughly 1.2% for 2027, 2.2% for 2028, and 2.7% a year for 2029–31. This is below Metaculus and Manifold, which are thinly traded and run high, and close to US intelligence and real-money markets once you adjust for long-shot pricing.

What else has to happen (conditional chain, about 0.24)

1. Every Taiwan fab stops, with no commercial wafers anywhere, for 90 straight days.
   • Invasion: about 0.75.
   • Full blockade: about 0.27. Taiwan holds 10–14 days of LNG and about 7 weeks of coal. The CSIS "Lights Out?" wargames had power falling to about 20% by week 9 of a blockade with no resupply. But escorted convoys, a short blockade, or the government giving TSMC priority power could keep at least one fab running, and that breaks the count.
   • Quarantine-style inspection regimes: about 0.03.
   • A useful check: through more than seven months of the 2026 Iran war and Hormuz disruption, TSMC never stopped.
2. TSMC publishes an explicit statement confirming the stoppage, its duration, and the cause.
   • TSMC does publish disruption updates; it did after earthquakes in 2016, 2024 and 2025 (news/1883, news/3204).
   • Against that, its 2025 Form 20-F avoids naming China or a blockade and speaks only generically of "military conflicts." Wartime information controls or a Chinese takeover would also suppress statements.
   • I put this at about 0.4 under invasion and 0.65 under blockade.

Combined: 40% invasion × 0.75 × 0.4, plus 60% blockade × 0.27 × 0.65, gives about 0.225, rounded up to 0.24. A small quarantine path adds about 0.1 percentage points.

Timing

I modelled a quarterly hazard for the start of a conflict. Publication lags the conflict by 1–4 quarters: at least 90 days of stoppage, then a TSMC update or quarterly report. The cumulative result is about 0.02% at March 2027, 0.2% at end-2027, 0.6% at end-2028, 1.2% at end-2029, 1.85% at end-2030 and 2.45% at end-2031.

Strongest case against my estimate

• Higher: If Metaculus-type odds are right (about 30% for a blockade by 2030), and a war almost certainly halts all fabs and TSMC certainly discloses it, the answer would be 7–15%. I give this some weight but not much: real-money markets and US officials are much lower.
• Lower: China may keep to grey-zone pressure or wait for a friendlier government in Taipei after 2028. Partial operations or vague wording would also fail the strict criteria. Together these could put the answer below 1%.

My figure sits between the two.

Question. By the last day of each quarter, has TSMC reported that production at its Taiwan fabs was stopped for at least 90 consecutive days because of military action, a blockade, or a quarantine?

Definitions.

• TSMC: Taiwan Semiconductor Manufacturing Company Limited, including its consolidated manufacturing subsidiaries.
• Taiwan fabs: TSMC-operated wafer-fabrication facilities physically located in Taiwan. The stoppage must cover all such facilities that were in commercial production immediately before the interruption, simultaneously; a shutdown of only some fabs, process nodes, or production lines does not count. Overseas fabs, packaging and testing plants, and facilities still under construction are outside the scope.
• Production stopped: commercial wafer fabrication has ceased, rather than merely declined. Maintenance, security, preservation of equipment, and noncommercial research or restart testing do not constitute resumed production. Processing commercial wafers at any covered Taiwan fab breaks the consecutive-day period, even if output remains below normal. A halt in shipments alone does not count.
• 90 consecutive days: one uninterrupted interval of at least 2,160 hours. TSMC must report an elapsed duration of at least 90 days or supply dates establishing that duration; separate interruptions cannot be added together. If only dates are given, use the difference between the reported stop and restart dates, or between the stop date and the date through which TSMC explicitly confirms the stoppage continued. An unspecified “three months” is insufficient unless dates establish at least 90 days.
• Military action, blockade, or quarantine: actual armed-forces operations, or an enforced interdiction or inspection regime restricting transport to or from Taiwan for military or political-security purposes, including one enforced by a coast guard. A public-health quarantine, ordinary customs inspections, tariffs, export controls, or sanctions without such interdiction do not qualify. No particular actor, declaration of war, or legal characterization is required.
• Because of: TSMC expressly attributes the qualifying stoppage to at least one of these causes. Direct damage and indirect consequences—including loss of power, materials, transport, personnel access, or repairs necessitated by the event—count. The military operation or restriction need not itself last 90 days. Mere coincidence with a conflict does not count.

Resolves YES if a qualifying TSMC publication confirms that the Taiwan-wide production stoppage has already lasted at least 90 consecutive days and attributes it to a qualifying cause. Multiple TSMC publications may jointly establish the facts, but the publication completing the evidence must explicitly confirm the uninterrupted duration or continuous stoppage through a stated date; silence after an initial shutdown announcement is insufficient. The stoppage may still be ongoing.

Resolves NO if no qualifying confirmation has been published by the quarter-end. Forecast shutdown durations, hypothetical risk disclosures, partial production cuts, interruptions confined to individual fabs, and earthquake-, accident-, drought-, or disease-related stoppages without a qualifying cause do not count.

Resolving source. TSMC-authored public statements and filings only: releases on tsmc.com or pr.tsmc.com; reports, presentations, and company-published earnings materials on investor.tsmc.com; and TSMC filings with the U.S. Securities and Exchange Commission (CIK 1046179, including Forms 20-F and 6-K) or Taiwan's Market Observation Post System (issuer 2330). The company's annual Form 20-F is an established source, for example its 2025 Form 20-F. Apply Public confirmation (A2) with this narrower, TSMC-only source rule: third-party reports and executive interviews alone cannot resolve YES. Apply Resolution date (A3) and the Resolution window. Treat the reported stoppage duration as an observation under the Observation period convention; its period must end after the opening date.