This article was co-authored by Darron Kendrick, CPA, MA. Darron Kendrick is an Adjunct Professor of Accounting and Law at the University of North Georgia. He received his Masters degree in tax law from the Thomas Jefferson School of Law in 2012, and his CPA from the Alabama State Board of Public Accountancy in 1984. This article has been viewed 315,421 times.

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To turn someone in to the IRS, start by gather any evidence you have access to, such as bank statements of unreported income and the names and contact details of any witnesses of fraud, to substantiate your claim. Once you’ve collected as much evidence as you can, download the correct form from the IRS website or call them to order one. For example, if you’re reporting a business or individual of violating tax laws, you’ll need form 3949-A. After you have the right form, fill in the details of the criminal’s fraudulent activities and send it to the address indicated on the form. If you choose to remain anonymous throughout the process, leave your personal details blank. For more tips from our Financial co-author, including how to appeal an IRS decision, read on!