Customs Act Article 59

I. Export processing factories may be registered, with the approval of Customs and under its supervision, as bonded factories. Raw materials imported and stored by bonded factories for manufacturing or processing into exported products shall be exempt from customs duties.II.Finished products processed or manufactured by bonded factories, and raw materials exempted from customs duties in accordance with the provisions of the preceding paragraph, shall not be moved out of bonded factories, unless approved by Customs and unless duties have been paid on products or raw materials in the form when they were moved out of bonded factories.III.Self-use machinery and equipment imported by a bonded factory shall be exempt from customs duty. Nonetheless, in case where the aforementioned machinery and equipment are exported to the tax area within five years following the date of importation, the duty-payer of such goods shall pay Customs duty in accordance with relevant laws and regulations governing the importation of goods.IV.Bonded factories shall apply to the relevant Customs office for registration. Regulations governing the qualification, conditions, capital requirements, application procedure, installation and equipment, registration and any registration changes, certificate application and renewals, processing, management, clearance, recoverable duty procedures for domestic sales of bonded goods and any other required matters shall be prescribed by the MOF.
中文原文 關稅法第59條
外銷品製造廠商,得經海關核准登記為海關管理保稅工廠,其進口原料存入保稅工廠製造或加工產品外銷者,得免徵關稅。
保稅工廠所製造或加工之產品及依前項規定免徵關稅之原料,非經海關核准並按貨品出廠形態報關繳稅,不得出廠。
保稅工廠進口自用機器、設備,免徵關稅。
但自用機器、設備於輸入後五年內輸往課稅區者,應依進口貨品之規定,補繳關稅。
保稅工廠業者應向所在地海關申請登記;其應具備之資格、條件、最低資本額、申請程序、設備建置、登記與變更、證照之申請、換發、保稅物品之加工、管理、通關、產品內銷應辦補稅程序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.