Tax Collection Act Article 30

For the collection of information required for taxation, investigator(s) appointed by the tax authorities concerned or the Taxation Administration of the MOF may conduct an investigation into the relevant entity, organization, or individual, request the subject of an investigation to provide accounting books, receipts, or other relevant documents, or request the presence of a taxpayer at the office of the investigator(s) to answer questions, to which the subject of the investigation shall raise no objection.The investigation in the above paragraph shall not exceed the necessary scope for the collection of the information required for taxation.Where the subject of an investigation considers the manner of the investigation conducted by the investigator improper, he/she/it may request the authorities in which the investigator serves or the supervisory authorities to handle the same in an appropriate manner.The competent tax authorities or the Taxation Administration of the MOF shall issue receipts for receiving any and all accounting books, documentary evidence, or other relevant documents provided by the taxpayer and other related parties, and shall return the same to the provider(s) thereof within thirty (30) days from the date on which all such accounting books, documentary evidence, and other relevant documents are provided, unless there is a suspicion of tax evasion. Under special circumstances, the period of retention of such documents may be extended for another thirty (30) days, and shall be limited to only one extension, with the approval of the head of the competent tax authorities or of the Taxation Administration of the MOF.
中文原文 稅捐稽徵法第30條
稅捐稽徵機關或財政部賦稅署指定之調查人員,為調查課稅資料,得向有關機關、團體或個人進行調查,要求提示帳簿、文據或其他有關文件,或通知納稅義務人,到達其辦公處所備詢,被調查者不得拒絕。
前項調查,不得逾課稅目的之必要範圍。
被調查者以調查人員之調查為不當者,得要求調查人員之服務機關或其上級主管機關為適當之處理。
納稅義務人及其他關係人提供帳簿、文據或其他有關文件時,該管稽徵機關或財政部賦稅署應掣給收據,除涉嫌違章漏稅者外,應於帳簿、文據或其他有關文件提送完全之日起,三十日內發還之;其有特殊情形,經該管稽徵機關或賦稅署首長核准者,得延長發還時間三十日,並以一次為限。

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