Code of Civil Procedure Article 91

Where the decision does not fix the amount of litigation expenses on the responsibility for litigation expenses, the court of first instance shall, on motion, fix the amount by a ruling after the conclusion of the action.A motion for fixing the amount of litigation expenses shall be filed with a statement of fees, a written copy or photocopy copy of such statement to be served upon the opposing party, and explanatory evidence of the stated fees.The amount of litigation expenses payable based on the amount fixed in accordance with the provision of the first paragraph or any other decisions shall be the amount fixed plus interest accrued at the statutory interest rate from the day after the date of the final and binding decision.
中文原文 民事訴訟法第91條
法院未於訴訟費用之裁判確定其費用額者,於訴訟終結後,第一審受訴法院應依聲請以裁定確定之。
聲請確定訴訟費用額者,應提出費用計算書、交付他造之計算書繕本或影本及釋明費用額之證書。
依第一項及其他裁判確定之訴訟費用額,應於裁判確定之翌日起,加給按法定利率計算之利息。

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