What is the cost of a TNTAP account? There is no cost for a TNTAP account. March 30, 2017 14:55 Related articles How do I close a location in TNTAP? What is the due date for a franchise and excise tax return that covers less than 12 months? How will I know if my request was successful? Which tax types are available in TNTAP? How do I file business tax online?