Regulations Governing the Establishment and Management of Offshore Island Duty-Free Shops Article 20

Where the value or quantity of goods sold by offshore island duty-free shops to travelers exceeds the limits prescribed in the preceding Article, the offshore island duty-free shops shall, with respect to the excess portion, calculate the duties and taxes payable in accordance with the Customs Act, the Commodity Tax Act, the Tobacco and Alcohol Tax Act, and the Value-added and Non-value-added Business Tax Act, collect the same from the travelers on behalf of the competent authority, and issue a sales note inclusive of the aforesaid duties and taxes to the travelers for their retention.Duties and taxes collected by offshore island duty-free shops from travelers pursuant to the preceding paragraph shall be reported to the competent Customs Office and remitted in the form of a consolidated declaration payment no later than the fifteenth day of the following month.
中文原文 離島免稅購物商店設置管理辦法第20條
離島免稅購物商店銷售予旅客之貨物,其金額或數量逾前條所定限額者,離島免稅購物商店應就超額部分,依關稅法、貨物稅條例、菸酒稅法、加值型及非加值型營業稅法規定計算稅額,代向旅客收取,並開立含上列稅款之售貨單交付旅客收執。
離島免稅購物商店依前項規定向旅客收取之稅款,應於次月十五日前向海關彙報並繳納。

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