Screen Shot TC 971 AC 501 The screen shot reflects how TS IDTVA uses TC 971 AC 501 to mark identity theft victim's accounts.Enter 971 in the TC> field;In the SECONDARY-DT field enter the tax year affected by the identity theft incident in the format MMDDYYYY;In the MISC field enter your specific BOD/Function, Program Name, and Tax Administration Source, see Exhibit 25.23.2-1, Acronyms and Definitions: andIn the remarks field enter Identity Theft