Taiwan banks' AI fraud detection freezes thousands of accounts
Taiwan banks deployed AI fraud-detection systems in April 2025 that froze thousands of legitimate customer accounts based on false positive pattern matching, affecting daily financial functions such as mortgage and tuition payments. The Financial Supervisory Commission responded by directing banks to improve AI precision and provide faster account unlock services by September 2025.
What happened
Taiwan domestic banks began deploying AI systems in April 2025 to detect fraudulent accounts and freeze suspicious transactions. The AI flagged accounts for unusual activity patterns such as sudden large deposits, frequent small transactions, or anomalies in transaction timing compared to established account behavior.
Thousands of legitimate customers reported their accounts were frozen without clear cause, including salary transfer accounts used for regular bills and loan payments. Customers faced freezes lasting approximately three months and reported being denied access to funds for essential expenses such as mortgage payments and school fees.
Reported impact
Public complaints escalated, with lawmakers reporting constituent grievances in the Financial Committee. Customers described account freezes as disruptive to daily financial life, and some reported being required to provide accounting records at bank counters to resolve freezes.
The Financial Supervisory Commission reported that in early 2025 warning account numbers (θ¦η€ΊζΆ) surged to 150,000 from a prior level of 66,000, prompting the AI deployment as a control measure.
Index analysis
The AI system triggered false positives on normal account activity, such as fixed monthly salary deposits that varied slightly or occasional larger transactions. The system lacked sufficient granularity to distinguish between legitimate customer behavior and fraud indicators.
Governance controls
In response to public outcry, the Financial Supervisory Commission in September 2025 directed banks to improve AI model precision, establish dedicated unlock telephone lines, and provide 24-hour account unlock services. The commission also required banks to authorize phone-line staff to resolve simple cases within one hour.
Classification
Sources and evidence
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