Business Tax Help Click on the headings below for more information about each topic. Are you new to TNTAP? Create a TNTAP logon. Here is what you need. Here is a video on how to do it. Here are some written instructions. Do you have a TNTAP logon and need access to your business tax account? Here are the steps. Here is a helpful video. What's changed with business tax? What does consolidated mean? Wondering how to file your taxes by city/county? Here is a video on how to file. Want to know more about authentication codes? What is it? Why did I not get it? Ready? Go to TNTAP. Still have questions? Search for answers on Revenue Help or submit your question to us.