Unique Document Identification Number

Unique Document Identification Number (UDIN) is an 18-digit number assigned to documents attested by practicing Chartered Accountants. It is a system-generated unique number that is generated for every new document.

Key Points

  • The use of UDIN for all the certificates issued by CAs has been mandated by the Institute of Chartered Accountants of India (ICAI), from 1st July 2019.
  • The UDIN generated by CAs can be searched in the UDIN portal by entering the name, contact, and Mail address of the person seeking information.
  • The first 2 digits of UDIN represents the current financial year. The next 6 digits are the Membership No. of the CA who has generated the ID. The last 10 digits are system generated random number.
  • The income-tax e-filing portal had already made it mandatory to quote UDIN for documents certified by a chartered accountant with effect from April 27, 2020, in compliance with the Income Tax Act, 1961.
  • This has been done to find out fake or incorrect Tax audit reports that are not authenticated with the ICAI.

Tax Department to validate UDIN from ICAI

The Income Department would validate the UDIN of CAs when they upload audit reports, with the Institute of Chartered Accountants of India (ICAI). It will be compulsory to validate UDIN while submitting a report or certificate or within 15 days of submitting such a report or certificate on the e-filing portal. If the validation is not done then the certificate will become invalid.


Institute of Chartered Accountants of India (ICAI) is India’s professional accounting body which regulates Chartered Accountancy in the country. The body sets standards for financial audits in the country. It was established in the year 1949 under the Chartered Accountants Act, 1949. ICAI is the 2nd largest professional accounting as well as finance body of the world.

Written by IAS POINT

No comments yet.

Leave a Reply