Article 5. In respect to a person whose house or household property had been heavily damaged because of the earthquake disaster, his increased income tax impossible upon the class A income as prescribed in Art. 1, No. 1 of the Increased Income Tax Law (the income shall hereinafter be called "the class A income"), shall be, as prescribed by the Minister of Finance, abated or exempted as the following; provided, however, this shall not apply in respect to a person the sum total of whose income from real estate referred to in Art. 10, par. 1, No. 1 of the Income Tax Law and whose class A and B business incomes referred to in No. 3 of the same Article, as accrued in 1946, exceed 50,000 yen: