Enforcement Rules of the Income Basic Tax Act Article 7

With respect to the securities transaction income referred to in Subparagraph 1, Paragraph 1, Article 7 of the Act, the method for estimating the transaction cost incurred from such transaction shall be identical with the calculation method adopted under Article 44 and Article 48 of the Income Tax Act and under Article 46 of the Enforcement Rules of the Income Tax Act.
中文原文 所得基本稅額條例施行細則第7條
本條例第七條第一項第一款所定之證券交易所得,其交易成本之估價,應與其依所得稅法第四十四條、第四十八條及同法施行細則第四十六條規定擇採之計算方法一致。

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