Five states, including Karnataka, Tamil Nadu and Telangana, have shown interest in rolling out Aadhaar-based authentication for GST registration.

The biometric-based authentication was discussed at the third National Co-ordination Meeting of senior Central and State GST officers.

Currently, two states, Gujarat and Andhra Pradesh, and the Union Territory of Puducherry have launched the Aadhaar authentication of taxpayers on a pilot basis.

GST authorities have so far been using OTP-based Aadhaar authentication to establish the identity of the applicants, seeking registration.