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 Creating a TNTAP logon TNTAP: Filing a Business Tax Return What information do I need to create a TNTAP login or gain access to an account in TNTAP? Who must pay business tax? How do I renew my business licenses? My local clerk said I would have to renew through the Department of Revenue.