Enforcement Rules of the Income Tax Act Article 61

Where the agent appointed in accordance with Paragraph 2, Article 72 and Paragraph 2, Article 73 of the Act and Paragraph 2, Article 60 of the Rules fails to file a tax return on behalf of the taxpayer within the prescribed period of time, the tax authority shall determine the taxpayer’s amount of income and amount of tax payable and shall notify the agent to pay in accordance with Article 79 of the Act.
中文原文 所得稅法施行細則第61條
本法第七十二條第二項、第七十三條第二項及本細則第六十條第二項規定受委託之代理人,未依規定期間代理申報納稅者,稽徵機關應依本法第七十九條規定,核定納稅義務人之所得額及應納稅額,通知其負責繳納之。

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