Using TNTAP as a Third Party This video provides information on how to use the Tennessee Taxpayer Access Point (TNTAP) application as a third-party representative. November 19, 2018 15:39 Related articles TNTAP: Gaining Access as a Third Party I am a CPA or tax preparer. How will I gain access to my clients’ accounts? Which tax types are available in TNTAP? My certificate of exemption has expired. Does the Department of Revenue automatically reissue these exemption certificates? How do I make an estimated payment in TNTAP?