During Taiwan's May tax filing season, many people have received emails claiming that their digital citizen certificates must be updated within 48 hours or their tax filing and government online services may be affected. Taiwan's Criminal Investigation Bureau warned that these emails are phishing scams impersonating the Ministry of the Interior or certificate management authorities to trick users into clicking suspicious links, downloading software, or entering personal information.

Police said the scam emails often use phrases such as “urgent security update notice,” “log in immediately,” or “failure to update may affect tax filing” to create panic and pressure. The messages also use official government names and digital certificate references to appear legitimate. Authorities recently discovered fake websites encouraging users to download the “HiCOS Client Card Management Tool,” increasing the risk of personal data leaks.

The Criminal Investigation Bureau noted that digital citizen certificates are linked to tax filing, labor and health insurance inquiries, and various government online services. If related data is exposed, users may face identity theft or financial risks. Police emphasized that government agencies will not ask citizens to update certificates or submit personal information through suspicious emails. People are advised to manually enter official website addresses or call the 165 anti-fraud hotline if they receive questionable messages.