Regulations Governing the Offsetting or Refund of Duties and Taxes on Raw Materials for Export Products Article 30

In the case of tax refund for raw materials used by export products, if it is subsequently discovered that there is an over-refund or an under refund of duties and taxes, the competent authority shall notify the relevant factories or firms to make up the amount over-refunded or to receive a further refund.Factories and firms whose duty refund cases for raw materials used for export products have been determined by the Customs and whose duties to be recovered resulted from the post-clearance audit implemented by Customs have been paid, under the condition that no regulations of the Anti-smuggling Act have been violated, may apply for the duty refund within two months from the day following the date of duty payment.
中文原文 外銷品沖退原料稅辦法第30條
外銷品原料退稅案件核定後查有溢退或短退稅者,經辦機關應向有關廠商追繳或補退,或由廠商自動補繳或申請發還。
廠商申辦外銷品原料退稅案件經核定後且經海關依關稅法第十三條規定實施事後稽核補徵稅款,未違反海關緝私條例相關規定者,得於稅款完納之翌日起二個月內申請退稅。

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