GST meaning · updated October 2026

Aadhaar authentication under GST explained

Aadhaar authentication is the identity check the GST system runs on the promoters, partners or authorised signatory of a business. It is done through an OTP on the Aadhaar-linked mobile number or, for applicants the system flags, through biometric verification at a GST Suvidha Kendra.

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Where it is required

The check is built into Rule 8 and Rule 10B of the CGST Rules. A new applicant opts for Aadhaar authentication while filing REG-01. If the applicant does not opt for it, or if the system's risk analysis flags the application, the officer can require physical verification of the place of business before approving registration.

  • New registration applications in REG-01
  • Applications for revocation of cancelled registration
  • Refund applications, including refunds of IGST paid on exports
  • Biometric verification at a GST Suvidha Kendra for applicants the system flags

How the OTP route works

After the application is submitted, an authentication link goes to the mobile number and email of each person named for verification. That person enters their Aadhaar number and the OTP sent to the Aadhaar-linked mobile. The link has a limited validity, so it should be completed the same day.

Common problems

  • The Aadhaar-linked mobile number is old or inactive, so the OTP never arrives
  • The name on Aadhaar does not match the name on PAN
  • Only one partner completes the link when several were selected
  • A biometric appointment is booked but documents carried do not match those uploaded

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This guide explains the law in general terms as of October 2026. Time limits and requirements can depend on the facts of your case and on the notice you received.

Questions

Aadhaar authentication — FAQs

Is Aadhaar authentication compulsory for GST registration?+
It is optional at the application stage, but skipping it can lead to physical verification and a longer approval time. For revocation and refund applications, the registered person needs to have completed Aadhaar authentication.
What happens if I am asked to visit a GST Suvidha Kendra?+
You book an appointment from the link in the intimation, visit with original documents, and have your photograph and biometrics captured. The application moves forward only after this is completed within the allowed time.
Can a company director who is not an Indian resident complete it?+
Persons without Aadhaar cannot use the OTP route, so the application proceeds without it and is processed with document checks and, where needed, physical verification.
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