Set-aside assessment scope: seized third-party search material must be processed under search assessment procedure, else assessment invalid.

Admissibility of additional legal grounds filed late was permitted because they raised pure questions of law apparent on the record and caused no prejudice; the Tribunal exercised plenary power to admit them. On the principal issue, material seized in third party search proceedings that was not before the appellate authority at the time of set aside falls within the search/undisclosed income regime and must be processed under the statutory search assessment procedure; using such material to complete a regular set aside assessment exceeded the AO's jurisdiction and rendered that assessment invalid, leading to dismissal of the Revenue's appeal.

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Issues: (i) Whether the Revenue's additional legal grounds filed after long delay are admissible; (ii) Whether the Assessing Officer in a set-aside de novo assessment could lawfully rely upon seized third party material that was not before the appellate authority at the time of set aside, and whether the assessment made on that basis was maintainable.

Issue (i): Admissibility of additional grounds of appeal filed by the Revenue after long delay.

Analysis: The additional grounds were legal questions arising on the face of the record and concerned jurisdictional and legal principles already engaged by the parties. Admission was considered in light of the Tribunal's plenary powers under the appeal statute to decide pure questions of law without necessitating fresh factual inquiry. The long delay was examined against the nature of the grounds (pure law, record-based) and the absence of prejudice to the other side.

Conclusion: The additional grounds are admitted; admission is upheld in favour of the Revenue.

Issue (ii): Legality of AO relying on seized material not before the appellate authority in set-aside proceedings and validity of the resulting addition under the Income tax Act.

Analysis: The set-aside direction required the AO to make a fresh assessment in accordance with the appellate directions. Material that was not before the appellate authority at the time of set-aside and which arose from search proceedings of a third party was held to fall within the special search/undisclosed income regime and required initiation of separate statutory search assessment proceedings. The AO instead utilized seized third party material while completing the regular set aside assessment under the assessment provisions; the process bypassed the statutory route for search/undisclosed income and thereby exceeded the lawful mandate of the set aside assessment. Given that the assessment impugned was founded on material obtained after the set aside and on which separate statutory procedure should have been invoked, the assessment was held to be beyond the permissible scope of the set aside proceedings. The Tribunal did not proceed to decide merits of the addition because jurisdictional defect rendered the assessment bad in law.

Conclusion: The Assessing Officer exceeded jurisdiction by completing the set aside assessment on the basis of seized third party material without initiating the appropriate search/undisclosed income proceedings; this conclusion is in favour of the Assessee.

Final Conclusion: The admitted additional legal grounds were considered and, on the principal issue, the set aside assessment based on seized third party material not before the appellate authority was quashed as beyond the mandate of the set aside proceedings; the Tribunal dismissed the Revenue's appeal without adjudicating the merits of the addition.

Ratio Decidendi: Where an appellate authority sets aside an assessment with directions for a fresh assessment, material that comes to light subsequently from search/undisclosed income operations and was not before the appellate authority must be dealt with under the statutory regime applicable to search/undisclosed income assessments rather than being incorporated into and concluded within the regular set aside assessment; using such subsequently discovered search material in the set aside assessment without invoking the appropriate statutory search assessment process renders the assessment invalid.

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