In case of under-assessment or a mistaken order, A.O. can rectify the mistake u/s 154 or make a reassessment u/s 147

If an assessment happens to be an under-assessment or a mistaken order, the course open to the AO is either to rectify the mistake u/s 154 or to make a reassessment u/s 147. While, it is correct, as held in EID Parry 216 ITR 489 (Mad), that the AO has to choose between the two and cannot initiate both proceedings at the same time, the principle of constructive res judicata made applicable by the Madras High Court that the AO having initiated rectification proceedings u/s 154 should stick to the same only and cannot drop that and proceed u/s 147 is not acceptable

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