Enforcement Rules of Stamp Tax Act Article 3

The "common currency" depicted in Article 3 of the Act shall mean the New Taiwan Dollar in Taiwan, Kinmen, Matzu and other offshore islands.
中文原文 印花稅法施行細則第3條
本法第三條所稱通用貨幣,在臺灣地區及金門馬祖等外島,係指新台幣。

English translation for reference only; the Chinese text prevails. Not legal advice.