Offshore Banking Act Article 4-1

An offshore banking branch may authorize a bank which has been designated by the CBC to engage in foreign exchange businesses (a "Designated Bank") to handle the business activities set out in paragraph 1 of the preceding article. Such businesses handled by a Designated Bank shall be booked in its offshore banking branch.The businesses which may be authorized to be handled by the Designated Bank include cross- straits financial activities approved by the competent authorities in accordance with the Act Governing Relations between the People of the Taiwan Area and the Mainland Area. The control and supervision of such activities shall be handled in accordance with the regulations related to cross straits financial activities. The offshore banking branch shall coordinate and be responsible for such control and supervision.If the Designated Bank charges the offshore banking branch reasonable fees for handling any of the offshore banking's activities in order to pay for operating costs, such fees shall be booked as the Designated Bank's income and be duly subject to taxation; if the Designated Bank does not charge the offshore banking branch any such fees, the costs for handling the offshore banking branch's businesses may not be booked as expenses.
中文原文 國際金融業務條例第4-1條
國際金融業務分行得將前條第一項各款業務,委託經中央銀行指定辦理外匯業務之同一銀行(以下簡稱指定銀行)代為處理,指定銀行處理時,應帳列國際金融業務分行。
前項國際金融業務分行得委託指定銀行代為處理之業務範圍,包括經主管機關依臺灣地區與大陸地區人民關係條例許可辦理之兩岸金融業務;其控管作業應依兩岸金融業務往來相關規定辦理,並由國際金融業務分行統籌負責。
指定銀行代為處理國際金融業務分行之各項業務,向國際金融業務分行收取合理對價以支應其營業費用者,該收入應列為指定銀行之所得,並依規定申報繳稅;指定銀行未向國際金融業務分行收取對價時,其代為處理各項業務之費用,不得以費用列支。

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