Where, under the terms of the gift, bequest, devise, or inheritance, the payment, crediting, or distribution thereof is to be made at intervals, then, to the extent that it is paid or credited or to be distributed out of income from property, it shall be treated for purposes of paragraph (2) as a gift, bequest, devise, or inheritance of income from property. Any amount included in the gross income of a beneficiary under subchapter J shall be treated for purposes of paragraph (2) as a gift, bequest, devise, or inheritance of income from property.