How Do You Report Suspected Tax Fraud Activity?

If you suspect or know an individual or company is not complying with the tax laws, you may report this activity by completing Form P-626, Wisconsin Tax Information Referral Form. We do not offer rewards for reporting this information. You may submit the form via email using the button on the upper right corner of the form, or you may print a completed form to send by fax or mail.

Mail or fax it to:

Wisconsin Department of Revenue
Audit Bureau
Mail Stop 5-257
PO Box 8906
Madison, WI 53708-8906
FAX: (608) 221-6637

If you have questions, call (608) 266-2772.

Although you are not required to identify yourself, it is helpful to do so in the event we need to contact you for additional information. Your identity can be kept confidential.

Privacy and disclosure laws prohibit the Department of Revenue from sharing information on any action taken based on information you provide.

If you are a tax professional who has experienced a data breach or theft of information which could potentially result in fraudulent refund activity, please contact the IRS for assistance at

November 21, 2016