Regulations Governing the Management of Private Airfields Article 9

If a private airfield allows aircraft belonging to others to use and a fee is thereof charged for such use, the fee calculation rate shall be reported to CAA, which shall review and submit it to MOTC for its approval.
中文原文 民營飛行場管理規則第9條
民營飛行場供他人航空器使用而收取費用者,其費率應報請民航局核轉交通部核定之。

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