Enforcement Rules for the New Town Development Act Article 27

Where a landownership holder has applied for postponement of commencement under Paragraph 2, Article 54 of the Building Act and the application has been approved, and thus the time limit for construction and utilization as prescribed in Paragraph 1, Article 18 of the Act is exceeded, no additional land value tax will be levied. However, in case construction is still not commenced or finished upon expiration of the postponed period, thus making the building license invalid, additional land value tax will be levied for the period computed from expiration of the time limit for construction and utilization to commencement of building.
中文原文 新市鎮開發條例施行細則第27條
土地所有權人已依建築法第五十四條第二項規定申請開工展期並經核准,其因而超出本條例第十八條第一項限期建築使用期限者,不予加徵地價稅。
但展期後仍逾期不開工或逾期未完工致建造執照作廢者,追溯自其超出限期建築使用期限當年期起至開工建築當年期止,依該規定加徵地價稅。

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