TNTAP: Navigating in a Period Watch this video to learn how to navigate and perform various actions with a period, including how to amend a return and make a payment. October 18, 2018 20:04 Related articles Can I change a return in TNTAP? Do I have to reapply in TNTAP? How do I apply for a Certification of Ownership? Do I need an IFTA license? How are penalties and interest computed?