What It Is and explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
UDIN (Unique Document Identification Number) authenticates documents certified by chartered accountants. Here is what it is and how to generate it.
What UDIN is
- A unique number generated by CAs on the ICAI UDIN portal
- Attached to certificates, audit reports and attestations
- Lets anyone verify that a CA genuinely signed the document
How to generate
- Log in to the ICAI UDIN portal
- Enter the document details and figures
- Generate and mention the UDIN on the document
Why it matters
UDIN curbs forged certificates and fake attestations in the name of CAs.
Frequently Asked Questions
What is UDIN?
A unique number CAs generate to authenticate the documents they certify.
How is UDIN generated?
On the ICAI UDIN portal by entering the document details.
Why was UDIN introduced?
To prevent forged certificates signed in the name of CAs.
Can UDIN be verified?
Yes — anyone can verify a UDIN on the ICAI portal.
Need help with this?
TaxClue's CA/CS experts handle GST, income tax and compliance end-to-end — fully online, transparent pricing.
Talk to an expert →