CBDT makes it mandatory to quote Document Identification Number
The CBDT vide Circular No. 19/2019 dtd. 14th August 2019 issued a notification wherein, the CBDT has made mandatory that no communication shall be issued by any income – tax authority relating to assessments, appeals, orders, statutory or otherwise, exemptions, enquiry, investigation, verification of information, penalty, prosecution, rectification, approval etc. to the assesse or any other person, on or after 1st October 2019 unless a computer – generated Document Identification Number (DIN) has been allotted and is duly quoted in the body of such communication.