①A person who has filed a return under Article 27 or Article 29, or a return filed after the deadline for such a return (including a person who has received a determination regarding inheritance tax), may file an amended return in the case where there is a shortfall in the amount of inheritance tax already finalized because a cause prescribed in paragraph (1), items (i) through (vi) of the following Article has occurred.

②A person prescribed in the preceding paragraph must, if there is a shortfall in the amount of inheritance tax already finalized because a cause prescribed in Article 4, paragraph (1) or (2) has occurred, file an amended return with the competent district director with jurisdiction over the place for tax payment within 10 months from the day following the day on which the person came to know that that cause had occurred (or, if the person comes not to have a domicile and residence in the area where this Act is enforced within that period without filing a notification of a tax agent under Article 117, paragraph (2) (Tax Agent) of the Act on General Rules for National Taxes, by the day on which the person comes not to have that domicile and residence).

③The provisions of the preceding paragraph do not apply if a reassessment under Article 35, paragraph (2), item (v) has been made before the deadline for filing the amended return prescribed in that paragraph.

④A person who has filed a return under Article 28, or a return filed after the deadline for that return (including a person who has received a determination regarding gift tax), may file an amended return if there is a shortfall in the amount of gift tax already finalized because the person has come not to acquire property by inheritance or bequest owing to the occurrence of a cause prescribed in paragraph (1), items (i) through (vi) of the following Article.