OIG performs independent, objective reviews of Treasury programs and operations, except for those of the Internal Revenue Service (IRS) and the Troubled Asset Relief Program (TARP), and keeps the Secretary of the Treasury and Congress fully informed of problems, deficiencies, and the need for corrective action. The Treasury Inspector General for Tax Administration (TIGTA) performs oversight related to IRS. A Special Inspector General and the Government Accountability Office (GAO) perform oversight related to TARP.