Regulations Governing the Implementation of the Common Standard on Reporting and Due Diligence for Financial Institutions Article 41

A Preexisting Entity Account with an aggregate account balance or value that does not exceed USD 250,000 as of 31 December 2018, is not required to be reviewed, identified, or reported.A Preexisting Entity Account that has an aggregate account balance or value that exceeds USD 250,000 as of 31 December 2018, or as of the last day of any subsequent calendar year, shall be reviewed in accordance with the procedures set forth in Article 42 and Article 43.
中文原文 金融機構執行共同申報及盡職審查作業辦法第41條
既有實體帳戶於中華民國一百零七年十二月三十一日帳戶總餘額或價值未逾二十五萬美元者,無須進行帳戶之審查、辨識或申報。
既有實體帳戶於中華民國一百零七年十二月三十一日或其後任一曆年度之末日帳戶總餘額或價值逾二十五萬美元者,應依第四十二條及第四十三條規定程序進行審查。

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