- 1). Gather as much documentation as you can about the deception. While you don't need to make copies of the fraudulent forms, taking down detailed information such as taxpayer identification, dates, amounts, names and addresses will prove helpful to your report.
- 2). Fill out Information Referral Form 3949-A, which is available on the Internal Revenue Service website (IRS.gov). Fill out as much information as you can about the suspect taxpayer, especially in Section 5a, which asks for a description of the violation and the amounts involved. Attach additional sheets if needed.
- 3). Write a letter if you do not want to use the form. Include as much of the following information as possible:
Name and address of the person you're reporting
Taxpayer ID (such as Social Security number)
Description of the violation, including how you discovered it
Years and estimated dollar amount involved - 4). Include your name, address and other contact information in either the form or the letter. This is not required, but may be helpful to the identification. You may request that your identity remain confidential.
- 5). Mail your report to:
Internal Revenue Service
Fresno, CA 93888. - 6). Use a different form when reporting abusive tax promotions and promoters. To report abusive tax professionals like CPAs, lawyers or enrolled agents, fill out the Referral Form for Reporting Abusive Tax Promotions and/or Promoters found in the Reference section and mail to the address listed on the first page of the form.
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