In this landmark judgment, the Bombay High Court, in a writ petition filed by State Bank of India, scrutinized the jurisdictional validity of reassessment notices under Section 148 of the Income Tax Act, 1961. The core legal issue was whether the reassessment, initiated on grounds that deductions for diminution in value of restructured advances were contingent and not allowable, constituted a permissible ‘reason to believe’ income escaped assessment or an impermissible ‘change of opinion.’ The Court, applying settled Supreme Court precedents like Techspan India and Kelvinator, emphasized that when a claim is explicitly made in the computation of income and the original assessment under Section 143(3) disallows other claims while not disallowing this one, it implies the Assessing Officer applied his mind and allowed it. The absence of explicit mention in the assessment order does not negate this, as orders typically detail disallowances, not allowances. The Court distinguished Revenue’s reliance on cases like Southern Technologies, noting it was available at the time of original assessment and not invoked then, and found no fresh information post-assessment to justify reopening. This decision reinforces the sanctity of Section 143(3) assessments and curbs arbitrary reassessments based on mere reconsideration, providing crucial protection for assessees against jurisdictional overreach by tax authorities.