In the case where a person who has acquired property by inheritance or bequest has given all or part of that property by gift, by the due date for filing the return under Article 27, paragraph (1) or Article 29, paragraph (1) of the Inheritance Tax Act relating to that inheritance or bequest (or, for property acquired due to the occurrence of a reason prescribed in Article 4, paragraph (1) or (2) of that Act after the filing of those returns, the return under Article 31, paragraph (2) of that Act relating to that acquisition), to the State or a local government, or to a corporation, from among incorporated public interest associations, incorporated public interest foundations and other corporations conducting business for public interest purposes, that is specified by Cabinet Order as one that contributes significantly to the promotion of education or science, the improvement of culture, contribution to social welfare or other enhancement of the public interest, the value of the property so given by gift is not included in the basis for calculating the taxable value for inheritance tax relating to that inheritance or bequest, except in the case where it is found that the gift would result in an unjust reduction of the burden of inheritance tax or gift tax on the person who made the gift, that person's relatives or other persons having a special relationship with those persons as prescribed in Article 64, paragraph (1) of that Act.
相続又は遺贈により財産を取得した者が、当該財産の全部又は一部を当該相続又は遺贈に係る相続税法第二十七条第一項又は第二十九条第一項の規定による申告書(これらの申告書の提出後において同法第四条第一項又は第二項に規定する事由が生じたことにより取得した財産については、その取得に係る同法第三十一条第二項の規定による申告書)の提出期限までに国若しくは地方公共団体又は公益社団法人若しくは公益財団法人その他の公益を目的とする事業を行う法人のうち、教育若しくは科学の振興、文化の向上、社会福祉への貢献その他公益の増進に著しく寄与するものとして政令で定めるものに贈与をした場合には、当該贈与により当該贈与をした者又はその親族その他これらの者と同法第六十四条第一項に規定する特別の関係がある者の相続税又は贈与税の負担が不当に減少する結果となると認められる場合を除き、当該贈与をした財産の価額は、当該相続又は遺贈に係る相続税の課税価格の計算の基礎に算入しない。