How should I proceed after receiving a letter stating that my tax return is under audit?

If you receive a letter stating your tax return is under audit, the letter will explain in detail which years are under audit, what documentation the audit will require, and where you should send the documentation. You may contact the auditor assigned your case directly with additional questions. The letter will contain the auditor’s telephone number and email address. Email communication is preferred. (Question and answer last reviewed June 24, 2024)