Reassessment under sections 147 to 151 is the most litigated corner of the Income-tax Act since the Finance Act 2021 rewrote it. A valid reopening now has to clear a sequence of gates: information suggesting escapement, a section 148A(b) show-cause, a reasoned 148A(d) order, sanction from the correct authority under section 151, and, after the 2022 Scheme, the faceless route mandated by section 151A. A defect at any gate is fatal to everything after it.
The rulings collected here map where the gates actually fail in practice: notices served beyond limitation, sanctions granted without application of mind, approvals from the wrong authority for the elapsed period, reopenings issued by the Jurisdictional AO where the faceless mechanism was mandatory, and notices that ignore an approved resolution plan or target a joint holder who contributed nothing to the purchase.
Each note states the one-line holding first, then the facts, the issue and what a practitioner should do differently on the next file. Every note is reviewed by a retired officer of the Income Tax Department who has sat on the sanctioning side of these very provisions.