As per Section 39(9), where the omission / incorrect particulars are pointed out by the department during audit/inspection/scrutiny/enforcement, the assesse can rectify such omissions/incorrect particulars in the returns. In the month/quarter in which such omission/ incorrect particulars are noticed, the due tax and interest shall be payable thereon.
(ICAI FAQ PUBLICATIONS 06-09-2017 RETURNS : FAQ NO. 25)