(6)Nothing contained in sub-sections (1) and (2) shall apply to the following classes of assessments, reassessments and recomputation which may, subject to the provisions of [sub-sections (3), (5) and (5A)], be completed—(i)where the assessment, reassessment or recomputation is made on the assessee or any person in consequence of or to give effect to any finding or direction contained in an order under section 250, section 254, section 260, section 262, section 263, or section 264 or in an order of any court in a proceeding otherwise than by way of appeal or reference under this Act, on or before the expiry of twelve months from the end of the month in which such order is received or passed by the Principal Commissioner or Commissioner, as the case may be; or(ii)where, in the case of a firm, an assessment is made on a partner of the firm in consequence of an assessment made on the firm under section 147, on or before the expiry of twelve months from the end of the month in which the assessment order in the case of the firm is passed.
