To ensure that there is no delay in the application process, the documents that are to be submitted have to be valid and correct. The lists of documents required for a Fastag are:

Age proof Address Proof
Passport Passport
Voter ID Aadhaar Card
Birth Certificate Voter ID
Photo ID Card issued by Central / State Govt Telephone Bill
Affidavit by Notary / Oath Commissioner LIC Policy Statement
SSLC Certificate Ration card