Unique Document Identification Number (UDIN) is a unique number assigned to every document certified or attested by a Chartered Accountant (CA) or a Company Secretary (CS) in India. It is an initiative launched by the Institute of Chartered Accountants of India (ICAI) and the Institute of Company Secretaries of India (ICSI) to prevent forgery and to ensure authenticity of documents
UDIN got mandatory for all certificates issued by Chartared Accountants.
UDIn (Unique Number) got mandatory for GST and Tax audit Report.
UDIN got mandatory for all other audits, attest and assurance function.
UDIN is a 18-digit alpha-numeric number which is generated online by the CA or CS at the time of certifying or UDIN verification or attesting any document. The number is linked to the name and membership number of the certifying professional, the date of certification, and the client details. Once the UDIN is generated, it is unique to the document and cannot be used again.
UDIN is mandatory for all documents certified or attested by a CA or CS in practice, including audit reports, certificates, tax returns, financial statements, and other documents issued by them. The objective of UDIN is to create a secure and transparent system that helps in preventing the circulation of fake documents and promoting ethical practices.
Last 2 digit of the current year.
Membership number issued by ICAI.
Alpha- numeric system generated code.

A Unique Document Identification Number (UDIN) is a secure, auto-generated code issued by professional regulatory bodies like ICAI to verify the authenticity of certificates, reports, and d
Whether you're submitting audit reports, certification forms, or financial statements, generating a Unique Document Identification Number ensures compliance and enhances the credibility of your professional documents.
In conclusion, UDIN is a significant step towards creating a secure and transparent system for document certification and attestation in India. The initiative not only helps in preventing the circulation of fake documents but also promotes ethical practices among the professionals. With UDIN, stakeholders can easily verify the authenticity of the documents and trust the certification or attestation done by the CAs and CSs. One need to follow below steps for UDIN generation:




UDIN stands for Unique Document Identification Number, which is a unique number assigned to every document certified or attested by a Chartered Accountant (CA) or a Company Secretary (CS) in India.
Only CAs and CSs in practice can generate UDIN for documents certified or attested by them.
Yes, UDIN is mandatory for all documents certified or attested by a CA or CS in practice, including audit reports, certificates, tax returns, financial statements, and other documents issued by them.
UDIN is generated online by the certifying professional at the time of certifying or attesting a document. It is a 15-digit alpha-numeric number that is unique to the document and linked to the name and membership number of the certifying professional, the date of certification, and the client details.
No, once a UDIN is generated, it is unique to the document and cannot be used again for any other document.
The purpose of UDIN is to prevent the circulation of fake documents and promote ethical practices by creating a secure and transparent system for document certification and attestation.
Stakeholders can verify the authenticity of a document by visiting the UDIN portal (www.udin.icai.org) and entering the relevant details such as the name of the certifying professional, the document number, and the date of certification.
No, there is no fee for generating UDIN. It is a free service provided by the ICAI and the ICSI to promote transparency and authenticity in document certification and attestation.
The benefits of UDIN include preventing the circulation of fake documents, promoting ethical practices, and creating a secure and transparent system for document certification and attestation
Yes, UDIN is currently applicable only in India and is a unique initiative launched by the ICAI and the ICSI in the country.