Unique Document Identification Number

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Querist : Anonymous

Querist : Anonymous (Querist)

16 February 2011 ICAI introduced Unique Document Identification Number for Practicing CAs.

what will be the procedure to use it. whether now we have to indicate Check digit / UDIN on each documents signed by us.

how could anybody trace document validity.

RAMESH KUMAR VERMA

RAMESH KUMAR VERMA (Expert)
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16 February 2011 for more info:-

https://www.icai.org/uid/?mode=login

Querist : Anonymous

Querist : Anonymous (Querist)

16 February 2011 In ICAI website it is not clear.

Aashok Kumar Sharma online

Aashok Kumar Sharma

(Expert)
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02 August 2025 The **Unique Document Identification Number (UDIN)** introduced by ICAI is a system to authenticate and track documents certified or signed by practicing Chartered Accountants. Here's a quick overview and how it works:

### What is UDIN?

* UDIN is a unique number generated by the ICAI portal for each document certified or signed by a CA.
* It helps in verifying the authenticity of certificates, reports, or any other documents issued by CAs.

### Procedure to use UDIN:

1. **Register/Log in on UDIN portal:**
Visit [UDIN portal](https://udin.icai.org/) and log in using your ICAI membership details.

2. **Generate UDIN for each document:**
For every certificate or document you sign, you must generate a UDIN by entering the required details (e.g., type of document, client name, date, etc.).

3. **Mention UDIN on the document:**
The generated UDIN should be mentioned on the document, usually near the signature or certification section, along with the date and your membership number.

4. **Verification:**
Anyone (clients, regulators, etc.) can verify the UDIN on the ICAI portal by entering the UDIN number to confirm the document’s authenticity.

### Is it mandatory?

* ICAI has made UDIN mandatory for various certificates and reports signed by CAs to curb fraudulent certifications.
* It’s best practice to generate and mention UDIN on all professional documents to maintain compliance.

### What about check digit?

* The UDIN itself is generated with an internal algorithm and includes a check digit or validation mechanism as per ICAI's system. You don’t need to add any extra check digit yourself.

### How to trace document validity?

* Anyone can go to the UDIN portal, input the UDIN number mentioned on the document, and verify the document’s details and authenticity online.

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If the ICAI website or portal feels unclear, you can also contact ICAI support or your regional ICAI office for detailed guidance and latest updates on UDIN use.

Would you like a step-by-step guide on generating UDIN from the portal?

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