Enforcement Rules of the Customs Act Article 47

For goods subject to Customs duty under Article 55, Paragraph 1, of the Act, the original duty-payer, the present holder, the transferor or transferee of the imported goods shall, within 30 days following the date of change in usage or transfer of ownership, submit an application for payment of import duty to the Customs at the original port of entry or a designated Customs with the following documents attached:1. The original invoice for such imported goods;2. The duty memo of Customs duty payment, if the goods were imported under duty reduction;3. The relevant documents for the granting of duty exemption or duty reduction.In the absence or in the partial absence of the related required documents as stipulated in the preceding paragraph, Customs shall assess the Customs duty on such goods in accordance with the Act.
中文原文 關稅法施行細則第47條
依本法第五十五條第一項規定應補繳關稅之貨物,其原進口時之納稅義務人、現貨物持有人、轉讓人或受讓人應自變更用途或轉讓之翌日起三十日內,檢同下列證件,向原進口地海關或經指定之海關申請補繳進口關稅:
一、原進口發票。
二、減徵關稅之進口貨物,檢附已繳進口稅收據。
三、核准減免關稅之有關證件。
前項申請補稅之貨物,未檢附證件或證件不全者,其應補繳之稅額,由海關逕行核定。

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