Understanding Section 139(9) In Income Tax And How To Respond To It Any Errors In Your ITR Filing Can Result In ‘Defective Return’ These Errors Can Be Either Missing Details Like Income From All Sources, TDS Mismatch With Income, Missing Audit Reports, Etc I-T Dept Will Send Defective Return Notice Under Section 139(9) Via Password Protected Email Email Will Be Password Protected, You Need To Enter PAN and DOB In DDMMYYYY Format In Lowercase Ensure That You Respond Within 15 Days So Your ITR Doesn't Become Invalid Respond With The Revised Return Or Seek Deadline Extension To Complete Revisions If Needed