How do I get a username and password to file business tax online? Business tax can now be filed in TNTAP. Click here for help creating a TNTAP logon. July 27, 2018 03:13 Related articles How do I file business tax online? How do I renew my business licenses? My local clerk said I would have to renew through the Department of Revenue. What is my business tax classification? How do I manage additional login IDs? What information do I need to create a TNTAP login or gain access to an account in TNTAP?