Act Governing Relations between the People of the Taiwan Area and the Mainland Area Article 66

Where any of the people of the Mainland Area inherits the estate of any of the people of the Taiwan Area, the heir shall submit a written statement of inheritance to the court of the place of the deceased's domicile within three years from the date of the commencement of succession; those who fail to submit within the aforementioned time limit are deemed to waive the rights of inheritance.Where any of the people of the Mainland Area inherits the estate of any serviceman in service or any retired serviceman who had no heir in the Taiwan Area and whose estate had been administered by the competent authorities prior to the coming into force of this Act, the statement of inheritance referred to in the preceding paragraph shall be submitted within four years.Where the commencement of succession took place prior to the coming into force of this Act, the time limits referred to in the preceding two paragraphs shall be calculated from the date of the coming into force of this Act.
中文原文 臺灣地區與大陸地區人民關係條例第66條
大陸地區人民繼承臺灣地區人民之遺產,應於繼承開始起三年內以書面向被繼承人住所地之法院為繼承之表示;逾期視為拋棄其繼承權。
大陸地區人民繼承本條例施行前已由主管機關處理,且在臺灣地區無繼承人之現役軍人或退除役官兵遺產者,前項繼承表示之期間為四年。
繼承在本條例施行前開始者,前二項期間自本條例施行之日起算。

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