“Section 151(1)”

An Assessing Officer cannot initiate reassessment proceedings under Section 147 of the Income Tax Act based on a mere change of opinion. Reassessment is permissible only when there is fresh tangible material leading to the belief of income escapement, not merely a review of existing facts.

When a notice under Section 148 of the Income Tax Act is issued, the Assessing Officer is bound to furnish reasons for reopening upon the assessee's request and must dispose of the assessee's objections to the notice by passing a speaking order.

For reassessment proceedings under Section 148, the Assessing Officer only needs prima facie material to have a reason to believe income has escaped assessment. Conclusive proof or evaluation of the sufficiency and correctness of such material is not required at the stage of issuing the notice.

For reassessment proceedings, the 'reason to believe' that income has escaped assessment must be based on some material and not mere suspicion, establishing a live link between the information and the belief. Furthermore, for reassessment beyond four years, there must be a specific finding of the assessee's failure to disclose fully and truly all material facts.

The Assessing Officer loses jurisdiction and the entire reassessment becomes invalid if no addition is made in respect of the income that formed the basis of the reopening. Explanation 3 to Section 147 does not permit assessing other escaped income unless an addition is made for the original income forming the reason to believe.

Notices issued under the unamended Section 148 of the Income-tax Act between April 1, 2021, and May 4, 2022, must be treated as notices issued under the new Section 148A(b) of the amended law. This requires the Assessing Officer to follow the procedure prescribed under the amended reassessment provisions, including issuing an order under Section 148A(d) before a fresh notice under Section 148.

The principle of finality dictates that stale issues should not be reactivated, and lapse of time brings repose to judicial and quasi-judicial controversies. A Commissioner cannot substitute their judgment for the Assessing Officer's unless the assessment order is legally erroneous, not merely less elaborate, thus limiting revisionary powers under Section 263.

Reassessment proceedings initiated solely based on an investigation wing/appraisal report, without the Assessing Officer's independent application of mind to form a 'reason to believe' that income has escaped assessment, are beyond jurisdiction, bad in law, and void ab initio.