In the case where, with regard to the net operating loss caused by a disaster prescribed in Article 80, paragraph (5) (Refund by Carryback of Loss) that has arisen in the interim period prescribed in that paragraph of a domestic corporation (hereinafter referred to as the "net operating loss caused by a disaster" in this Article), the domestic corporation (including another group tax sharing corporation, if the domestic corporation is a group tax sharing corporation) was subject to the provisions of Article 80, the amount equivalent to the net operating loss caused by a disaster that was used as the basis of the calculation of the amount to be refunded by filing the interim return based on provisional closing of accounts prescribed in that paragraph (if the domestic corporation is a group tax sharing corporation, the amount that was treated as the amount used as the basis of the calculation of the amount to be refunded pursuant to the provisions of paragraph (13) of that Article) is included in gross profits, when calculating the amount of income for the business year containing the interim period.