Enforcement Rules of the Customs Act Article 20

With regard to the imported goods subject to Customs duty as specified in Article 37, Paragraph 1, Subparagraph 1, of the Act, the cost of repair or assembly shall be taken as the basis for the calculation of Customs value to assess Customs duty. However, if the goods are shipped abroad for repair at no cost to the buyer and this can be evidenced by the free repair warranty contained in the original sales contract or invoice(s) or the correspondence between the buyer and the seller, such goods shall be exempted from Customs duty when they are re-imported.The cost of repair or assembly, referred to in preceding paragraph, shall not include the cost of freight and insurance.In the absence of documents evidencing the repair or assembly costs or free repair arrangement in respect of imported goods on which import duty is leviable or exempt under the provisions of the preceding paragraph 1, Customs may take an amount equal to one tenth of the Customs value of the re-imported goods after repair or assembly for assessment of Customs duty.In the absence of the Customs value of the identical goods or similar goods imported at the time of exportation of the re-imported goods subject to Customs duty under Article 37, Paragraph1, Subparagraph 2, of the Act, the Customs value of the re-imported goods shall be assessed by reference to the Customs value of the identical or similar goods imported on a date close to the date of exportation of the re-imported goods. In the absence of the Customs value of the identical goods or similar goods imported as referred to in the preceding sentence of this paragraph, the difference between the Customs value of the goods re-imported after having been processed abroad and the FOB value of the goods originally exported shall be taken as the basis in determining the Customs value of the re-imported goods.At the time of exportation and re-importation, the name, quantity and specifications of the goods subject to or exempt from Customs duty under Article 37 of the Act shall be indicated in detail on the export declaration and the import declaration, and a statement shall be made thereon that the goods are being shipped abroad for repair, assembly or processing. In addition, any damage or defect which requires repair or assembly, and the name, specifications, and quantity of the goods after processing shall be indicated on the exportation declaration.Where actual circumstances require an amendment of the name, specifications and quantity of the processed goods, referred to preceding paragraph, reasons for such amendment shall be stated in the import declaration during re-importation for inspection and approval purposes.
中文原文 關稅法施行細則第20條
依本法第三十七條第一項第一款規定課稅之進口貨物,以其修理、裝配所需費用作為完稅價格課徵關稅。
但運往國外免費修理之貨物,如其原訂購該貨之合約或發票載明保證免費修理,或雙方來往函電足資證明免費修理者,復運進口免稅。
前項修理、裝配所需費用,不包括運費及保險費。
依第一項規定課稅或免稅之進口貨物,不能提供修理、裝配費或免費修理之有關證件者,海關得按貨物本身完稅價格十分之一,作為修理、裝配費之完稅價格計課。
依本法第三十七條第一項第二款規定課稅之進口貨物,如原貨出口時,無同樣或類似貨物進口之完稅價格時,得參照接近原貨出口日期之同樣或類似貨物進口之完稅價格核估,無同樣或類似貨物進口之完稅價格時,得就加工復運進口貨物之完稅價格與原出口貨物離岸價格之差額課徵之。
依本法第三十七條規定課稅或免稅之貨物,其出口及復運進口時,均應於出口或進口報單詳列品名、數量及規格等,並聲明係運往國外修理、裝配或加工者。
同時將應修理或裝配之損毀缺失情形或加工後之物品名稱、規格及數量等於出口報單載明。
前項加工後之物品名稱、規格及數量,因事實需要須予變更者,應於復運進口時,於報單敘明理由,以憑核對。

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