Customs Act Article 63

I. Customs duty paid on raw materials used in the manufacture of articles intended for export is refundable following exportation of the finished products according to the standards for the raw materials in the quantity required for normal production, unless the item of duty refund has been cancelled by the MOF by public notice or the amount of the refundable duty, or percentage of it in the FOB price of the finished products is lower than the floor prescribed by the MOF.II.Customs duty leviable on raw materials may be recorded in books with guarantees provided by the manufacturers and offset following the exportation of the finished products.III.Manufacturer may apply for a duty refund or an offsetting of the accounts for export products, with relevant export documents, within one year and six months following the date on which the raw materials were released for importation. After the expiration of the prescribed time limit, the application for a duty refund or offset shall be rejected.IV.The time limit referred to in the preceding paragraph may be extended under special circumstances approved by the MOF. Such an extension shall not exceed one year.V. Regulations governing the refund and offsetting of customs duty paid on raw materials, the approval standards and calculations of such a refund or offset, application procedure, time limits, guarantees provided, records of the offset on accounts and any other required matters shall be prescribed by the MOF.
中文原文 關稅法第63條
外銷品進口原料關稅,除經財政部公告取消退稅之項目及原料可退關稅占成品出口離岸價格在財政部核定之比率或金額以下者,不予退還外,得於成品出口後依各種外銷品產製正常情況所需數量之原料核退標準退還之。
外銷品進口原料關稅,得由廠商提供保證,予以記帳,俟成品出口後沖銷之。
外銷品應沖退之原料進口關稅,廠商應於該項原料進口放行之翌日起一年六個月內,檢附有關出口證件申請沖退,逾期不予辦理。
前項期限,遇有特殊情形經財政部核准者,得展延之,其展延,以一年為限。
外銷品沖退原料關稅,有關原料核退標準之核定、沖退原料關稅之計算、申請沖退之手續、期限、提供保證、記帳沖銷及其他應遵行事項之辦法,由財政部定之。

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