Can IRP registrations be processed through the mail or electronically? Yes, the easiest way to do your registration is online through the Tennessee Taxpayer Access Point (TNTAP). Forms are available here. July 16, 2018 20:35 Related articles How do I renew my IRP account? How do I open a new IRP account? What Motor Carrier functions can I do online through TNTAP? Will TNTAP replace the old system for IRP for doing things such as transfers, renewal and supplements? When do my IFTA license and decals expire?