Where Do You Report Suspected Tax Fraud Activity?
If you suspect or know of a company or person who is not complying with the tax laws, you can report their activity by phone, mail or your local IRS walk-in office.

Tax Shelter Hotline
The IRS Office of Tax Shelter Analysis serves as a clearinghouse for information about potentially improper tax shelter activity. You can submit information by mail, telephone, fax, or e-mail.

Report Abusive CPAs, Attorneys or Enrolled Agents
Special e-mail address to report actions by unscrupulous tax professionals to the IRS Office of Professional Responsibility.