If you suspect or know of an individual or company that is not complying with the tax laws, report this activity. Reports of suspected tax fraud can be made by phone, mail or your local IRS walk-in office.

By phone:  

You can contact the IRS toll free at 1-800-829-0433.

International callers may call their US Embassy or call 215-516-2000 (this is not a toll-free number).

By mail:

Written correspondence can be mailed to the service center where you file your return. Addresses can be found at; Where to File Addresses

Although you are not required to identify yourself, it is helpful to do so. Your identity can be kept confidential. You may also be entitled to a reward.

If you are a taxpayer who lives outside the United States, the IRS has full-time permanent staff in 7 U.S. embassies and consulates. Contact My Local Office Internationally has telephone numbers and addresses of these offices.

Walk-in Offices:

IRS Taxpayer Assistance Centers locations can be found at Contact My Local Office. 

If you are a taxpayer who lives outside the United States, the IRS has full-time permanent staff in 7 U.S. embassies and consulates. Contact My Local Office Internationally has telephone numbers and addresses of these offices.

Frequently Asked Questions - 1.13 IRS Procedures: Reporting Fraud

Criminal Investigation (CI)

Tax Fraud Alerts