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What Is A UDIN Number For CA: Know More About It

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This is the question every CA has in the beginning, what is a UDIN number for CA? and it is very important to get to know not only CA, every common person should know about it. UDIN is the ‘Unique Document Identification Number’. The Institute of Chartered Accountants generated the UDIN generation method on their portal for assurance and more clarity of documents issued by Chartered Accountants.  

This attestation has very much value and this attestation plays an important role in the documents issued by Chartered Accountants are not false or fraudulent. Before the UDIN, The Institute of Chartered Accountants of India, realized fake certificates by non-CAs, misrepresenting themselves as Chartered Accountants leading to misleading authorities and stakeholders. As a solution to this matter, ICAI started to generate a UDIN number for every CA for surety of document issuing by Chartered Accountants.

What Is  UDIN Number For CA?

UDIN stand’s for the ‘unique document identification number’. This is the number for CA who are in practice to ensure the documents issued by them are true and real. Udin unique document identification number plays a very important role in document attestation. On February 1, 2019, it comes into existence. Udin issued by the income tax office.

Where To Mention Udin In Tax Audit Report?

Members may be aware that Unique Document Identification Number UDIN has been made mandatory in the following phases as per the decision taken in the 379th meeting of the Council held on 17-18 December 2018, for that matter CA has  compulsory to know what is UDIN number for CA?:

  • Practicing CAs w.e.f. All certifications made by 1 February 2019.
  • All GST and Tax Audit Reports w.e.f. 1 April 2019.
  • All other certified works w.e.f. 1 July 2019.

On 4 March 2019 hosted on ICAI's website.

To bring uniformity in the manner of signing audit reports by members of ICAI, it has been decided to require members of ICAI to also mention UDIN immediately after the membership number of ICAI while signing audit reports. 

This requirement shall be in addition to other requirements relating to the auditor's signature prescribed in relevant laws or regulations and standards on auditing. UDIN  issued by the Income Tax Department. It is very important to get knowledge about what is  UDIN number for CA?

Registration Procedure:

  1. First, go to the official website of the Institute of Chartered Accountants (ICAI).
  2. Select “Sign up for the first time”, enter your 6-digit membership number, date of birth, and enrollment date, then click on the ‘Send OTP’ button.
  3. You have to enter the OTP received on SMS and Email and click on “Continue”. Login details will be sent to the registered email address.

Generate UDIN for Tax Audit:

Firstly every CA has to know what is UDIN number for CA? and after he needs to generate the UDIN.

1) Visit the portal of the Institute of Chartered Accountants (ICA).

2) Login with the received information on your email address and if you want to change the password then you can change the password whenever you want.

3) Then click on the option “Generate UDIN” respectively on the screen.

4) Fill in all the details blanks which are Member Registration Number, Name, E-mail Address, Firm Registration Number, Firm Name, Customer Reference Code/Number, Document Description, Document Date, Keywords, and Values.

5) Keyword is a word that defines a specific value mentioned in the document.

6) If a Chartered Accountant is validating an individual's sales, for example, one of the keywords may be 'Sales' with an appropriate sales as per its value.

7) You must provide at least 3 or 5 keywords with their respective value.

8) Enter the received OTP on email and mobile and verify the details accordingly.

9) If you want to make some changes, click on “Back”. Otherwise, click on the "Submit" button.

10) You cannot edit the details once submitted, so make sure you enter all the correct information.

11) After submitting it, UDIN will be generated respectively.

This explains the question of how to prepare UDIN for a tax audit. CA needs to know what is  UDIN number for CA?

Requirements To Generate UDIN

Not only for CA, everyone should know about what is UDIN number for CA? These all are the requirements of UDIN

  • You have to select the correct document type.
  • Make sure you mention the date of signing the document.
  • There are three fields for entering financial data in the document. However, if there are no financial figures in the document, only two fields are mandatory, mention zero.

Verification of UDIN

ICAI makes it compulsory for every CA. So, every CA has to study what is  UDIN number for CA?

However, there may be situations in which the document may require either certain modifications or complete cancellation. In this scenario, UDIN can be revoked by searching the document on the UDIN portal and clicking on the 'Revoke Tab'.


For strengthening the practice side of Company Secretaries, ICSI has started using UDIN (Unique Document Identification Number) by all Company Secretaries for verification and authentication of service documents who are in practice from 1st October 2019. For every CA and CS it is very important to know what is  UDIN number for CA? and what is a UDIN number for CS?

Rules governing the use of UDIN have been added by the provisions of Volume (I), Part 2 of the Second Schedule, 2006 to the Company Secretaries (Amendment) Act, 2006 where the ICSI Council has incorporated the provisions of mandatory use of UDIN for verification and enforcement by Company Secretaries. Validation of documents whenever providing their services in the transaction.

Use of UDIN by Company Secretaries

  • Ensure forgery of multiple attestations/certificates
  • Enable shareholders/stakeholders to attest documents to be verified by the Company Secretary
  • Ensure easy adherence to guidelines on maintenance of a register of services rendered by members in mandatory authentication and practice.
  • Enable auto-filling of details of registered CS members in the practice every time verification or authentication is triggered.

At the time of signing the certificate, UDIN gets generated.

Update UDIN on E-Filing Portal: -

Previous members have reported invalid UDIN in the e-filing system of the Income Tax Department in several cases. Some technical changes have been made to their lighting. Members are encouraged or requested to update any previous invalid UDIN on the e-filing portal and please note that the last date for updating UDIN in electronic form is 30 June 2022. All members are also encouraged to prepare UDIN carefully by selecting the relevant field.

Extended date for e-filing portal on 4th July 2022

Firstly everyone should know about what is  UDIN number for CA?

Members are informing the Income Tax Department about invalid UDINS on e-filing on the portal. Keeping this in mind certain changes have been made. Members are advised to try again to update the invalid UDIN on the e-filing portal. But ICAI gives more time to CAs to verify and upload UDIN correctly. The extended date for updating UDIN is till 30 September 2022.


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