prpri Unique Document Identification Number (UDIN) for Practising CAs Unique Document Identification Number (UDIN) for Practising CAs

UDIN: An Advanced Solution for Document Verification-  Unique Document Identification Number (UDIN) is a unique number which is to be generated for every document certified /attested by practicing Chartered Accountants and will be registered with UDIN Portal at (with effect from 1st July, 2018).

UDIN aims to address the concern of documents/certificates issued by any other person not being practicing Chartered Accountants.

Also Read-

UDIN mandatory with effect from 1st January, 2019 for Practising CAs

UDIN for Chartered Accountants (FAQs)


Unique Document Identification Number (UDIN)

It has been observed that at many instances financial statements and documents are being certified/attested by third persons in lieu of our CA members. These statements misleads various authorities/other stake holders who rely upon them.

To address above, an innovative concept of Unique Document Identification Number (UDIN) has been conceptualized and developed by Professional Development Committee of ICAI which was also being demanded by various regulators. UDIN is a unique number, which will be generated for every document certified/attested by Practising Chartered Accountants and registered with the UDIN portal. The portal is available at

Accordingly, the Council at its 374th meeting decided to implement UDIN, therefore it has been made recommendatory with effect from 01st July, 2018, and later on it would be made mandatory.

The portal offers the facility to various Regulators/Banks/Authorities/Other Stakeholders to check the authenticity of the documents certified by Practicing Chartered Accountants who have registered on the said portal. It would help them in tracing of forged/wrong documents prepared by any third person in the name of Chartered Accountant, as a person other than Chartered Accountant will not be able to upload the documents on this portal.

For Process and related Frequently-Asked Questions, please visit .

For any other further assistance/clarification, you may reach us at 011–30110440/444 or email at .


FAQs on Unique Document Identification Number (UDIN)

1. What is Unique Document Identification Number (UDIN)?

Unique Document Identification Number (UDIN) is a unique number, which will be generated by the system for every document certified/ attested by a Chartered Accountant and registered with the UDIN portal available at

2. What is the Algorithm of UDIN?

Algorithm of UDIN comprises of the following:

1. The Membership Number of the Member attesting the document/ certificate.

2. The Date (dd/mm/yy) when certificate is issued.

3. The Document Serial Number allotted automatically by system.

15 digit UDIN

3. Why UDIN?

It has been noticed that financial statements and documents were being certified/ attested by third persons, in lieu of Chartered Accountants. As these statements are being relied upon by the authorities as true statements and certificates, UDIN can be generated by a practicing CA by registering his/her documents/ certificates on UDIN Portal for verification.


4. Who can generate UDIN?

A practising Chartered Accountant can generate a UDIN for certificate/ document attested by him either in individual capacity or as a partner.

5. Whether UDIN is mandatory for the CA members of ICAI for each certification done?

At present, this facility is recommendatory. But ICAI is mulling to make the same compulsory in near future, so as to curb the menace of fake or forged documents.

6. What is the link to crosscheck whether the certificate number so indicated is valid?

The Certificate Number can be cross checked at https://udin.icai .org?mode=searchudin 

7. How many UDINs can be generated by a CA? Is there any limit?

There is no restriction on the number of UDINs to be generated by a CA.

8. How to create an account on the UDIN portal?

To register at UDIN portal, please take the following steps:

Step 1: Enter the homepage 

Step 2: Click button “For first time sign up, click here”

Image 1

Step 3: Enter your six-digit Membership No., Date of Birth and Date of Enrollment, and click the “Send OTP”

An OTP will be sent to you at the mobile and email, as registered with the ICAI.

Step 4: Enter OTP received and click “Continue”, you will receive username and system generated password at the mobile and email, as registered with the ICAI.

9. How to Sign in?

Go to the link

and Enter your Membership No, Password and click “Login”

10. Should the password be changed after login for safety?

The password generated is encrypted to ensure its appropriate safety. However, Members may change the password at any time. “Change Password” menu can be used to change the password.

  • Sign in.
  • Under “Sign-in”, select “Change Password” menu.
  • Enter your current Password.
  • Enter your new password, then click send OTP. You will receive an OTP rget pa sword? on your mobile and email, as registered with the ICAI.

15. How to generate a Unique Document Identification Number (UDIN)?

” After login, click “Generate UDIN”

” Enter details such as, your Client Reference Code/Number, Document Issued, Document Description, Date of Document, Keywords/Values (minimum three) with in the document and click the button “Send OTP”. Firm Registration Number (F RN) is Optional.

” An OTP will be sent to you at the mobile and email, as registered with the ICAI.

” Enter OTP received and click the button “Preview”. You will see the details you have entered for generating the UDIN.

” If there is any change in the content, you should click the button “Back” or else click the button “Submit”

” A UDIN will be generated and you can use that UDIN on the document for which it has been generated

UDIN that have been generated would be displayed as watermarked on document(s) else the UDIN can be mentioned on the document(s) using a pen. “List UDIN” menu can be used to print the UDIN.

16. Can one see the various certificate numbers generated?

Yes, one can see and search the various certificates number generated using the search option.

17. Is any modification possible in case incorrect information such as client reference code/number, Document Issued Under, Document Description, Date of Document, Keywords within the document, etc., has been submitted?

No change is possible in the data already registered by a Chartered Accountant in the online system. Therefore, members are requested to thoroughly check the details in preview option before submission of their application.

Information filled in can be edited/ modified any number of times before the submission. But once it is submitted, it cannot be edited.

18. Can a Certificate number once generated be revoked or cancelled?

The UDIN once generated can be withdrawn or cancelled with narration. Hence if any user search for this UDIN, appropriate narration indicated by Member with the date of revoke will be displayed for reference.

19. What is the validity of a UDIN on the portal for viewing by a third party?

As of now, there is no time limit.

20. Is UDIN mandatorily required to be registered for the search?

Yes, UDIN will be available for search by the end user only after registration.

21. What are the key values and are they necessary?

While registering the certificate for generation of UDIN, the member has to compulsorily provide Key values (minimum three and maximum five), which are found in the document or certificate generated. Key values can be any financial figure extracted from the attested statement or certificate such as Turnover Net profit, Utilization amount, Import amount, Export amount, Duty refund, Refund, Net worth, Revenue, Input tax credit, Loan amount, Total Assets, Net owned funds, Profitability, Capital To Risk Asset Ratio (CRAR), Statutory Liquidity Ratio, Gross fixed assets, Net loss, Misc. expenditure, Total capital investment, Sanction amount, Other (please specify any key words), etc.

22. What happens if while registering on UDIN Portal, the information is not accepted or the password is not sent?

Credentials do not match with the database as maintained by the regional offices. Probably, the database maintained does not have the correct email ID or mobile number, or the regional offices may have entered the same wrongly. For example, entering multiple email IDs in one field, providing space before the email IDs, etc.

You may reach the PDC Department at (011) 3011 0444, 0444 or by writing to For all issues relating to the data regarding enrolment dates, DOB, email IDs, phone number corrections, etc., please get in touch with the respective regional offices. 

Western Region

ICAI Tower, C-40, G-Block, Bandra Kurla Complex, Bandra (E)

MUMBAI – 400 051

Phone : [+91] (22) 3367 1400 / 1500

[+91] (22) 3367 1462, 463

E-mail:; wirc@icai. in;


Northern Region

ICAI Bhawan, 52-53-54, Institutional Area, Vishwas Nagar, Shahdara, Near Karkardooma Court

DELHI – 110 032

Phone: [+91] (11) 3989 3990, 3021 0600

[+91] (11) 3021 0636, 629




Central Region

ICAI Bhawan, Plot No.9, Block No.A-1, Lakhanpur

Kanpur 208024 (UP)

Phone: [+91] (512) 3092600

[+91] (512) 3092634, 681



Eastern Region,

ICAI Bhawan, 382/A, Prantik Pally Rajdanga, (Near Acropolis Mall & Garden High School), Kasba, KOLKATA – 700 107

Phone: [+91] (33) 3084 0210 / 03

[+91] (33) 3084 0296, 289




Southern Region

ICAI Bhawan, 122, Mahatma Gandhi Road

Post Box No. 3314, Nungambakkam

CHENNAI – 600 034

Phone: [+91] (44) 3989 3989, 3021 0300

[+91] (44) 3021 0355, 391





23.Is online generation of UID number is mandatory? Or, if the UID number is generated offline, can the same be entered in back date?

Yes, it is mandatory that the numbers to be generated online only.

24. How will the UDIN appear on the documents?

UDIN that have been generated would be displayed as watermarked on document(s) else the UDIN can be mentioned on the document(s) using a pen. “List UDIN” menu can be used to print the UDIN.


25. Can UDIN be generated as per the category of the area of certificate?

Yes, UDIN can be generated in the specific area of certificate, like Goods & Service Tax Act, banks, Companies Act, Income-tax Act, finance and capital market, public finance and government accounting, etc,.

Log Out

Click logout, when you wish to leave this application. Please note, there is a provision of automatic logout, if there is no activity for five minutes.

For any assistance/ clarification, members may call us at (011) 30110444 or email at

How to Register on UDIN website and How to Generate and Revoke UDIN- Download Process Chart


More Under CA, CS, CMA


  1. M Poorna Vijaya Bhoopalan says:

    Hello Sir,
    I am Advocate how can i get the UDIN number if not possible means if any other way is there to as a tax practitioner

Leave a Comment

Your email address will not be published. Required fields are marked *

Search Posts by Date

August 2021