Chartered Accountants’ (CAs) attestation of documents holds immense value in the financial world. It plays a pivotal role in confirming the accuracy and reliability of various documents, including audit reports that ensure the truth and fairness of financial statements. One significant development in this realm is the introduction of UDIN, which stands for Unique Document Identification Number.

♦ Purpose of UDIN

  • To combat fraudulent individuals posing as Chartered Accountants, issuing misleading documents.
  • The Institute of Chartered Accountants of India (ICAI) introduced UDIN as a security measure for documents.

♦ What is UDIN?

  • UDIN is a unique number generated on the UDIN portal for each document attested by a registered Chartered Accountant.

♦ Registration on UDIN Portal

  • Full-time Practicing Chartered Accountants (CAs with COP) must register to generate UDINs.
  • Steps for registration include providing personal details, receiving OTP, and obtaining login credentials.

♦ Generating UDIN for a Document

  • After registration, CAs can generate UDINs for their documents.
  • Steps include logging in, entering document details, receiving OTP, verifying details, and generating UDIN.

♦ Format of UDIN

  • UDIN consists of 15 digits:
    • First 6 digits: Membership Registration Number.
    • Next 6 digits: Date of certificate issuance (DD/MM/YYYY).
    • Last 3 digits: Serial number of the document from the UDIN portal.
    • A UDIN (Unique Document Identification Number) typically consists of 15 alphanumeric characters. Here’s an example of a UDIN number:


In this example:

    • The first six characters “X12345” represent the Membership Registration Number of the Chartered Accountant.
    • The next six characters “120922” represent the date of issuance of the certificate in DD/MM/YYYY format, which in this case is September 12, 2022.
    • The last three characters “001” represent the serial number of the document as generated by the UDIN portal.

Unique Document Identification Number

♦ UDIN Verification

  • UDIN helps verify the authenticity of documents issued by Chartered Accountants.
  • Authorities like banks and tax departments can use UDIN for validation.
  • Documents can be located using UDIN, Firm Registration Number (FRN), Client Reference Code, and more via the UDIN portal.

♦ Verification of Documents using UDIN

  • Once generated, UDIN-linked document details cannot be modified.
  • For changes or cancellations, the UDIN can be revoked through the portal with a reason provided.
  • Revoked UDINs remain on the portal but are marked as “Revoked.”

♦ UDIN Helpline

  • For inquiries or assistance related to the UDIN portal, contact:
    • PDC Department – (011) 3011 0444
    • Email:

♦ Preventing Document Misrepresentation

  • UDIN is an essential measure to prevent the misuse of CAs’ signatures and credentials.
  • It enhances transparency and accountability in financial reporting and auditing processes.

♦ Benefits of UDIN

  • Enhances trust and transparency in financial documents.
  • Reduces the risk of fraudulent documents and certifications.
  • Holds CAs accountable for their certified documents.
  • Streamlines document verification processes for authorities and institutions.

♦ Secure and Transparent Document Attestation

  • UDIN ensures that only valid and authorized documents are accepted by regulatory bodies and stakeholders.
  • CAs are encouraged to comply with UDIN requirements to maintain professional integrity and credibility.

♦ Frequently Asked Questions (FAQs) on UDIN (Unique Document Identification Number):

1. What is UDIN, and why is it important?

UDIN stands for Unique Document Identification Number. It is a unique identifier assigned to documents attested or certified by Chartered Accountants (CAs). UDIN enhances document authenticity and helps prevent fraud by verifying the legitimacy of CA-issued documents.

2. Who can generate UDIN?

Only Chartered Accountants (CAs) registered with the Institute of Chartered Accountants of India (ICAI) can generate UDINs for documents they attest.

3. What types of documents require a UDIN?

UDIN is primarily generated for certificates and documents attested by CAs, including audit reports, financial statements, tax audit reports, and various certifications.

4. How do I register on the UDIN portal?

Full-time Practicing Chartered Accountants (CAs with COP) can register on the UDIN portal by providing personal details, receiving an OTP (One-Time Password), and obtaining login credentials from the portal.

5. How do I generate a UDIN for a document?

After registering on the UDIN portal, CAs can log in, enter document details, provide keywords and values, and receive an OTP for verification. Once verified, the UDIN is generated and can be used on the document.

6. What is the format of a UDIN?

A UDIN comprises 15 digits: The first six digits represent the Membership Registration Number of the CA, the next six represent the date of certificate issuance (DD/MM/YYYY), and the last three represent the serial number of the document.

7. Can I modify or delete details after generating a UDIN?

No, once a UDIN is generated for a document, its details cannot be modified or deleted. However, in certain situations, a UDIN can be revoked with a reason provided.

8. How can I verify a document using a UDIN?

Stakeholders, including regulatory authorities and banks, can verify the authenticity of documents issued by CAs by entering the UDIN on the official UDIN portal. The system will confirm the document’s legitimacy.

9. What are the benefits of UDIN?

  • Enhanced trust and transparency in certified documents.
  • Reduced risk of fraudulent documents.
  • Accountability for CAs.
  • Streamlined document verification for authorities and institutions.

10. How can I contact the UDIN helpline for assistance?

For inquiries or assistance related to the UDIN portal, you can contact the UDIN helpline at PDC Department – (011) 3011 0444 or via email at

In conclusion, UDIN is a crucial tool for ensuring the credibility and authenticity of documents attested by Chartered Accountants, thereby promoting transparency and accountability in the financial sector. It serves as a valuable resource for both CAs and stakeholders who rely on their services.

Author Bio

Qualification: CA in Practice
Company: ANRA & Associates
Location: Delhi, Delhi, India
Member Since: 11 Apr 2019 | Total Posts: 15
ANRA have team of experienced professionals committed to work as your growth partners I am a Partner with the ANRA & Associates practice and is based in New Delhi & Gurgaon. I have working experience in Accounts Management, Direct and Indirect taxation, registrations, Foreign Compliances View Full Profile

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December 2023