In a notification, the ministry said these changes have been notified as part of Know Your Customer (KYC) details for small saving schemes backed by the government. Before this, investments in small saving schemes were allowed without the submission of one's Aadhaar number.
PAN-Aadhaar linking: Failure to link your PAN and Aadhaar cards comes with its own set of consequences. Read this story to know what will happen if PAN card becomes inoperative?