Get as much detail about the suspected tax fraud as possible. This may include, but is not limited to, the name and address of the suspect, as well as any additional information surrounding the alleged fraud.
Visit the IRS homepage and download form 3949-A, Information Referral.
Complete the form by typing directly into it. Print the completed form.
Write a separate letter addressed to the IRS, specifically asking to be kept anonymous throughout the course of the investigation. You must date and sign the letter. According to the IRS, “your identity can be kept confidential.” However, since form 3949-A does not give you the option to remain anonymous during the investigation, make the request in writing.
Send your completed form 3949-A and letter via certified mail to the following address:
Internal Revenue Service Fresno, CA 93888
Expect to receive confirmation about the receipt of your report and request from the IRS.
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