Nationality Act Article 9

A foreign national applying for naturalization shall provide a certificate of loss of original nationality within one year from the day of permission for naturalization or from the day of reaching the age at which he/she may renounce nationality under the laws of his/her original country.A foreign national who fails to provide a certificate of loss of original nationality within the prescribed period shall be subject to revocation of permission for naturalization. However, an application for a deadline extension may be filed if the inability to submit said certificate is due to legal or administrative restrictions of his/her original country as verified by the Ministry of Foreign Affairs.Foreign nationals shall not be allowed to reside in Taiwan before submitting a certificate of loss of original nationality as prescribed in the preceding two Paragraphs.A foreign national may be exempted from submitting a certificate of loss of original nationality if any of the following circumstances apply:1. He/she applies for naturalization under Subparagraph 3 of Paragraph 1 of Article 5.2. He/she applies for naturalization under Paragraph 1 of Article 6.3. He/she cannot obtain a certificate of loss of original nationality for reasons not attributable to himself/herself.