Enforcement Rules of the Household Registration Act Article 30
For the census and household registration, there shall check and record the household in which existing residents have resided or are expected to reside for three and more months.
中文原文 戶籍法施行細則第30條
戶口調查及戶籍登記，應查記戶內居住已滿或預期居住三個月以上之現住人口。