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.
Mail or fax it to:
Wisconsin Department of Revenue
Audit Bureau, Unit E
Mail Stop 5-144
P.O. Box 8906
Madison, WI 53708-8906
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.
Last updated December 19, 2012