Land Tax Act Article 41

In accordance with the provisions of Articles 17 and 18, for land eligible for a special tax rate, the landowner must submit an application at least forty days before the commencement of the Land Value Tax collection period each year. Applications submitted after this deadline will have the special rate applicable starting the following year. For previously approved land whose use has not changed, no application is required for subsequent years.When the reason or fact justifying the application of the special tax rate ceases to exist, the landowner must promptly report this to the competent tax authority.
中文原文 土地稅法第41條
依第十七條及第十八條規定,得適用特別稅率之用地,土地所有權人應於每年地價稅開徵四十日前提出申請,逾期申請者,自申請之次年開始適用。
前已核定而用途未變更者,以後免再申請。
適用特別稅率之原因、事實消滅時,應即向主管稽徵機關申報。

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