Deemed information expands reassessment scope; officer must follow inquiry, show cause hearing and obtain prescribed higher approval. Deemed information expands grounds for treating income as escaped and permits issuance of notices under section 148. For non search cases, flagged risk management information or a final CAG objection constitutes such information. For search, survey or requisition scenarios meeting specified criteria, the AO is deemed to have information for the three preceding assessment years. Under section 148A the AO must, with requisite prior approvals, conduct any inquiry, issue a show cause notice (7-30 days), consider the reply and pass an order within one month from the end of the month in which the reply is received or the reply period expires; prior higher approval is required for orders below Joint Commissioner where Explanation 2 applies.