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Unique Document Identification Number (UDIN) - A Complete Guide

Updated on: 16 Jan, 2024 05:49 PM

UDIN is a certificate issued by a Chartered Accountant representing the trueness and fairness of that document. UDIN holds immense value as it is a testament that there has been no misrepresentation of information in the attested document, and the stakeholders can rely on the information provided in that document. In this guide, we talk about what is UDIN number, its applicability, the steps to generate UDIN, and the UDIN verification process.

What is UDIN?

UDIN number stands for Unique Document Identification Number, is an 18-digit number that is unique in nature and is generated by the system for every document attested/certified by practicing chartered accountants.

In these 18 digits, the

  • First 2 digits are YY - The last 2 digits of the current year. For instance, 96 from the year 1996.
  • Next 6 digits are MMMMMM - The membership number of ICAI.
  • Next 10 Digits are AANNNAANNN – Alpha-numeric system-generated code.

When is UDIN Applicable?

As per ICAI, it is mandatory for all practicing CAs to obtain UDIN for all the certificates issued by them if the certification depicts that the document has a true and fair view. Only CAs having a certificate for practice can register on the UDIN portal and generate UDIN for the documents/certificates attested by them. It is mandatory for the following services -

  • All certificates issued from 1st Feb 2019.
  • GST and Income Tax Audit from 1st April 2019.
  • All audit and assurance functions from 1st July 2019.

CA-generated UDIN can be searched on the UDIN portal by typing the name, email ID, and contact of the person making the request.


How to Register on UDIN Portal?

The full-time practicing Chartered Accountants are required first to register themselves on the UDIN portal to start generating UDIN for attested documents.

Step 1. Visit this link.

Step 2. Select ‘first-time user’ and then enter the 6-digit membership number, date of enrolment, and date of birth, and click on ‘send OTP.’

Step 3. Enter the OTP received on email and the mobile number registered with ICAI. As soon as you click on continue, system-generated login credentials are sent to you on your e-mail address registered with ICAI.


How to Generate UDIN for a Document?

  • Step 1. Visit this link and log in using the credentials sent to your email address. You can change the password for the UDIN portal. It is best if you do it after logging in for the first time.
  • Step 2. Click on ‘Generate UDIN.’
  • Step 3. Enter the details such as email ID, name, firm registration number, membership registration number, firm name, client reference code/number, keywords, and values, and click on submit OTP.
  • Step 4. An OTP is sent to the mobile number or the email address registered with ICAI. Once you enter the OTP, you can preview the details entered and verify them. If everything is correct, you can click submit.
  • Step 5. Now, you can generate the UDIN.

How to do UDIN Verification?

UDIN is an initiative that was taken by the government to prevent the misrepresentation of Chartered Accountants and put a check on third persons posing as Chartered Accountants and forging signatures to mislead authorities.

UDIN can help the respective authorities check the validity of the documents issued by the Chartered Accountants. Since UDIN can only be generated via the UDIN portal, it validates that the document has been thoroughly checked and certified by a practicing Chartered Accountant.

UDIN Verification Process

UDIN can be verified by clicking on ‘Verify UDIN’ on the UDIN portal and following the below-mentioned steps -

  • Step 1. Click on ‘Verify UDIN.’ After this, a window asking you to enter a few details will open.
  • Step 2. Enter the details such as mobile number, email ID, and name of the authority.

How to Verify Documents using UDIN?

Once a UDIN has been generated for any document, the details within this document cannot be modified in any way. However, if a situation arises in which the document requires some changes or complete revocation/cancellation, then you can search for the document on the UDIN portal and click on ‘Revoke.’


Frequently Asked Questions

Q- How to correct the error in the form with a valid UDIN after it has been issued?

If there is a mistake or an error in the form attached with a valid UDIN after it has been uploaded, then you can only revise the form by revising it with a new UDIN and revoking the old/existing UDIN of the submitted form.


Q- What kind of documents can be verified through UDIN?

UDIN is applicable to both digitally and manually signed reports that have been uploaded online. If there is no field on the digitally signed online reports mentioning the UDIN, then you can generate it and keep it safe to provide if asked by the stakeholders.


Q- Is there any limit on the generation of UDIN?

As per the rules of UDIN laid out by the Central Government, there is no limit on the number of UDINs a CA can generate. Also, the UDIN generated does not have any expiry until revoked by the authority.


CA Abhishek Soni
CA Abhishek Soni

Abhishek Soni is a Chartered Accountant by profession & entrepreneur by passion. He is the co-founder & CEO of Tax2Win.in. Tax2win is amongst the top 25 emerging startups of Asia and authorized ERI by the Income Tax Department. In the past, he worked in EY and comes with wide industry experience from telecom, retail to manufacturing to entertainment where he has handled various national and international assignments.