Regulations Governing Visiting, Residency, and Permanent Residency of Aliens Article 10

Any foreign national who invests in Taiwan, who is employed in Taiwan pursuant to Article 46, Paragraph 1, Subparagraphs 1 to 7 or Article 48, Paragraph 1, Subparagraph 1 or 3 of the Employment Services Act, who is a professional worker under Article 4, Subparagraph 4, Items 3 to 5 or Articles 8 to 11 of the Act for the Recruitment and Employment of Foreign Professionals, or who has obtained approval for residency from the Ministry of Foreign Affairs, may apply for an extension of residency with the NIA before his/her duration of residency expires. His/Her spouse, any of his/her children below the age of 18 or any of his/her children aged 18 or older who is unable to support himself/herself due to physical/mental disability may, if originally permitted for residency, also apply for such extension.The Alien Resident Certificate of any applicant whose application for an extension of residency under the preceding paragraph has been approved shall be extended for 6 months commencing on the day following the completion of the original authorized period of residency. Before the extension expires, he/she may apply for another extension if necessary, provided that the total cumulative period of residency extension shall not exceed one year.
中文原文 外國人停留居留及永久居留辦法第10條
外國人來臺投資,或依就業服務法第四十六條第一項第一款至第七款、第四十八條第一項第一款、第三款應聘來臺,或從事外國專業人才延攬及僱用法第四條第四款第三目至第五目、第八條至第十一條之專業工作,或經外交部專案許可居留,於居留期限屆滿前,本人、其原經許可居留之配偶、未滿十八歲子女及年滿十八歲因身心障礙無法自理生活之子女,得向移民署申請延期居留。
依前項規定申請延期居留經許可者,其外僑居留證之有效期間自原居留期限屆滿之翌日起延期六個月;延期屆滿前,有必要者,得再申請延期居留一次,總延期居留期間最長為一年。

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