S. 147 : Reassessment-After the expiry of four years-Business expenditure-Penalty imposed for breach of a civil obligation would be outside purview of Explanation 1 to section 37(1)-Assessing Officer who had specifically gone into the allowability of the claim-A mere assertion in the absence of any material would not constitute a ‘tangible material’ for purposes of reopening an assessment-Reassessment notice and order disposing the objection was quashed. [S. 37(1), 143(3), 148, Art. 226]