You can buy a tag from an official Tag issuer or a participating bank. Once the Tag is issued, it will be activated and ready for use within 24-48 business hours. Following are the documents required to get the FASTag: 1) Certificate of Registration of Vehicle 2) Passport size photo of the vehicle owner 3) KYC documents for ID and Address Proof (either of these- Voter Id Card, Driving Licence, PAN Card or Passport) and Aadhaar Card