Enforcement Rules of the Customs Act Article 40

Application for duty exemption in respect of imported goods as compensation or replacement under Article 51, Paragraph 1, of the Act shall be filed with Customs within one month following the date of Customs release of the originally imported goods as indicated on the import declaration.Application for duty exemption of the imported goods in accordance with Article 51, Paragraph 2, of the Act shall be filed within three months following the date of installation and testing of the machinery and equipment, along with a document issued by the competent authorities certifying the date of testing of the machinery and equipment. In the absence of such document, the provisions of the preceding paragraph shall apply.
中文原文 關稅法施行細則第40條
本法第五十一條第一項規定賠償或調換進口之貨物之免稅,應於原貨物進口之翌日起一個月內向海關申請,其起算日期以進口報單所載之海關放行日期為準。
依本法第五十一條第二項規定,於安裝就緒試車之翌日起三個月內申請核辦者,應檢具目的事業主管機關證明試車日期之文件,如未能檢具者,仍應依前項規定辦理。

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