House Tax Act Article 6-1

House tax takes the date of the end of February each year as the base date for tax liability. The tax amount is determined by the local competent tax authority based on the house tax registration information and is levied once every year from May 1 to May 31. The tax period is from July 1st of the previous year to June 30th of the current year.For newly built, added or renovated houses, if the construction is completed in the current period, the tax will be charged on a monthly basis, and if it is no more than one month, it will not be counted; if it is demolished in the current period, the same applies.For houses that are newly built, added or renovated from March 1st to June 30th of each year, the house tax for that period will be collected in the next period; for houses that were demolished from July 1st of the previous year to the end of February of the current year, house tax shall be levied for the months that the house has not yet been demolished.
中文原文 房屋稅條例第6-1條
房屋稅以每年二月之末日為納稅義務基準日,由當地主管稽徵機關按房屋稅籍資料核定,於每年五月一日起至五月三十一日止一次徵收,其課稅所屬期間為上一年七月一日起至當年六月三十日止。
新建、增建或改建房屋,於當期建造完成者,按月比例計課,未滿一個月者不計;當期拆除者,亦同。
每年三月一日起至六月三十日止新建、增建或改建完成之房屋,該期間之房屋稅併入次期課徵;上一年七月一日起至當年二月末日止拆除之房屋,其尚未拆除期間之當期房屋稅仍應課徵。

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