Can I register my new business on TNTAP? Yes. If you have never been registered in Tennessee, please go to TNTAP and click “Register a New Business” under the Registration heading. May 27, 2018 14:42 Related articles How do I register for sales and use tax? Creating a TNTAP logon Can I choose to save and come back to registering my business through TNTAP? How do I get a copy of my resale certificate? What is the nexus standard for out-of-state retailers?