“full and true disclosure”

An Assessing Officer cannot reopen an assessment under Section 147 based on a mere change of opinion regarding the same material available during the original assessment. Reopening requires fresh, tangible material or information that leads to a reason to believe income has escaped assessment.

Reassessment proceedings under Section 147 are valid even after a scrutiny assessment under Section 143(3), provided the Assessing Officer forms a reason to believe, based on definite, specific, and reliable information, that income escaped assessment due to the assessee's failure to fully and truly disclose material facts.

The assessee's duty is limited to disclosing all primary, material facts necessary for assessment, including entries, documents, and other evidence. It is for the Assessing Officer to draw inferences of fact and law, and the assessee is not obligated to offer such inferences.

Reassessment proceedings initiated under Section 147 beyond four years from the end of the relevant assessment year are invalid unless the assessee failed to disclose fully and truly all material facts necessary for assessment. Without such failure, the notice issued under Section 148 is time-barred and without jurisdiction.

Reassessment proceedings are invalid if the reasons recorded for initiating action under section 148 are not served on the assessee within the limitation period prescribed by section 149. Furthermore, reassessment cannot be based on a mere change of opinion without tangible material, particularly when the assessee has made a full and true disclosure of material facts.

An Assessing Officer cannot issue a notice under Section 148 to reopen an assessment when all material facts were already before the AO during the original assessment, even if the AO failed to apply their mind at that time. Such an action constitutes an impermissible review of a concluded assessment rather than a reassessment based on fresh tangible material.

Reassessment initiated under Section 147/148 is invalid if the Assessing Officer relies on material obtained post-recording of reasons, or if it amounts to a mere change of opinion on facts fully and truly disclosed by the assessee during the original assessment. An assessee's obligation extends only to the full and true disclosure of primary facts, not to provide further assistance or inferences.

Sanction under Section 151 granted in a mechanical manner, without application of mind, vitiates reassessment proceedings under Sections 147 and 148. The court also laid down guidelines for the Revenue to follow when reopening assessments, emphasizing the need to provide reasons and approval documentation to the assessee.