Unique Document Identification Number (UDIN)

Last Updated at: Feb 02, 2021
Unique Document Identification Number (UDIN)
The ICAI has recently announced a One-time Condonation Scheme to regularize UDINs. Under this Scheme, the members will be allowed to generate the earlier missed UDINs for the documents signed between 1st February 2019 to 31st December 2020. The scheme will be made available from 1st January 2021 till 31st January 2021.


The government recognised that certain miscreants forge their signatures to pretend to be professional and accredited Chartered Accountants. Posing to be Accountants helps them issue certificates, which leads to companies being misled. As a result, the Institute of Chartered Accountants of India developed a technique to ensure that such forgery does not occur. The ICAI began issuing a Unique Document Identification Number, better known as the UDIN to every document. It has become operative from October 1st, 2019. It ensures accountability and transparency in tax administration. 

In this blog, we will take a look at the UDIN, UDIN registration, and why the Unique Document Identification Number is so essential.

  1. What is the Unique Document Identification Number?

  2. UDIN Portal and UDIN Registration Process

  3. How to generate UDIN When Needed

  4. UDIN Login and Format

  5. Verification of Documents Via UDIN Number 

  6. Importance of UDIN

What is the Unique Document Identification Number?

The Unique Document Identification Number, better known as the UDIN, is a unique number that is available through the UDIN portal. This number is a part of every registered Chartered Accountant-issued certificate, making the certificate more authentic and credible. Every document attested by a professional Chartered Accountant has a UDIN attached to it. The number helps authorise the report, as it means that the certificate was verified by a CA who is a part of the UDIN portal.

UDIN Portal and UDIN Registration Process

To get access to a Unique Document Identification Number, full-time Chartered Accountants must first register on the UDIN portal. Doing so helps them generate the UDIN for all documents that they authorise and certify. Here’s how to register on the UDIN portal.

  1. First and foremost, go to the official UDIN portal, the link for which has been given below;
  2. https://udin.icai.org/?mode=myicai
  3. Next, click on First-time Users from the homepage.
  4. Enter your membership ID, date of enrolment with the website, and date of birth. 
  5. Next, click on the Send OTP button. 

Send OTP button

Source: https://udin.icai.org/FAQ-UID.pdf

  1. Enter the OTP you received on your registered mobile number/email ID, and click on the Continue button.
  2. On doing so, the UDIN portal will send you the required login credentials to your registered Email ID. 

How to generate UDIN When Needed

After registering on the UDIN portal, to generate UDIN when needed, here’s what you need to do;

  • Go to the official link of the UDIN portal
  • Login to the UDIN portal using your credentials.

UDIN portal

Source: https://udin.icai.org/FAQ-UID.pdf

  • From the homepage, click on Generate UDIN.

Generate UDIN.

  • Enter details such as name, email ID, Membership number, firm name, and document description.
  • After you finish, double-check the data and click on the Send OTP button.
  • Next, you will receive an OTP on your registered email ID/mobile number.
  • Enter the OTP, recheck the details entered, and then the UDIN will be generated. 

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UDIN Login and Format

The UDIN login happens using the login credentials that the UDIN portal sends you once you enter the OTP they sent to your phone. You can use these credentials to log in to the portal whenever you require a UDIN number for any documents. Furthermore, you also have the option to change the password whenever you want to. It is recommended that you do so after logging in for the first time.

The UDIN is a unique 15-digit number of the following format:

Additionally, the first six digits refer to your Membership Number with the ICAI.

Digits seven through twelve refer to the date of issuance of the certificate. The format of the date is DD/MM/YY.

The last three digits serve as a serial number by which the UDIN portal references the document. X-X-X-X-X-X / X-X-X-X-X-X / X-X-X = (Membership Number) – (DDMMYY) – (Serial. Number)

serial number by which the UDIN portal

Verification of Documents Via UDIN Number

After the generation of the UDIN Number, all the details regarding the document are a part of the UDIN portal. Furthermore, such information with the UDIN cannot have changes or modification. In some instances, after verification, certain aspects can be changed or cancelled. Such situations lead to the original UDIN being revoked, through a function on the website. However, to do so, the concerned professional has to give a valid reason.

Importance of UDIN

The UDIN number is an idea by the ICAI as a means to curb malpractice and misrepresentation by miscreants posing as professional Chartered Accountants. Organisations can check the authenticity and validity of documents submitted and issued by CAs through this system. Also, as the UDIN generation occurs only through the UDIN portal, law enforcers do not have to worry about forging and misrepresentation anymore. Furthermore, the Firm Registration Number, Date of Document, and Reference Code can be used to check the document through the UDIN portal.

UDIN Helpline

  • (011) 3011 0444
  • udin@icai.in