Labor Insurance Act Article 11

For workers mentioned in article 6, all insured units shall compile a list and notify the insurer on the same day when the insured persons join the enterprise, or the association, start training courses, separate from the enterprise, withdraw from the association, or end the training courses. The beginning or the ending of such insurance coverage shall start from the day on which the lists were sent out by the insured unit. In case the insured unit fails to send out the list on the same day when the insured persons report for work, join the association, or begin training courses, the day following the day on which such a list is actually sent out to the insurer shall be counted as the day on which the coverage takes effect. In such a case. the insured units shall be fined according to the provisions of article 72 of this Act.
中文原文 勞工保險條例第11條
符合第六條規定之勞工,各投保單位應於其所屬勞工到職、入會、到訓、離職、退會、結訓之當日,列表通知保險人;其保險效力之開始或停止,均自應為通知之當日起算。
但投保單位非於勞工到職、入會、到訓之當日列表通知保險人者,除依本條例第七十二條規定處罰外,其保險效力之開始,均自通知之翌日起算。

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