Enforcement Rules of the Customs Act Article 15

Where there are two or more transaction values available with respect to identical goods as referred to in Article 31, Paragraph 1, of the Act, the applicable transaction value shall be determined in accordance with the following order of precedence:1. The transaction value of identical goods produced by the same manufacturer shall be given precedence in application over the transaction value of identical goods produced by other manufacturers.2. The transaction value of identical goods at the same commercial level and in substantially the same quantity as the goods being valued shall be given precedence in application.3. Where there are two or more transaction values of identical goods available, the lowest value shall be given precedence in application.The provisions of the preceding paragraph shall apply mutatis mutandis to the transaction value of the similar goods as referred to in Article 32, Paragraphy1, of the Act.
中文原文 關稅法施行細則第15條
本法第三十一條第一項所定同樣貨物交易價格有二種以上時,其交易價格,依下列順序認定之:
一、同一廠商生產之同樣貨物之交易價格,應較其他廠商生產之同樣貨物之交易價格優先適用。
二、同樣貨物與進口貨物交易型態相同及交易數量相當者,其交易價格應優先適用。
三、同樣貨物之交易價格有二種以上時,以最低者為準。
前項規定,於本法第三十二條第一項所定類似貨物之交易價格準用之。

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