What are the working hours of CPC? myITreturn Helpdesk Updated May 20, 2016 11:31 Follow Taxpayers can contact CPC from 8:00am to 8:00pm from Monday to Friday. Working hours of CPC, CPC office, Income tax Here we provided the working hour of CPC. Have you filed your Income-tax return yet? Click here to start now. Related articles "Assessee wants to know email id for CPC? " What is CPC help line number? Can I make rectification or other correspondence with CPC in paper form? Various e-filed Return / Refund status "Assessee is not able to call on toll free number from abroad? " Comments 0 comments Please sign in to leave a comment.