The Wisconsin Department of Revenue is protecting taxpayers using strong fraud protection safeguards. Those protection efforts include relying on tips from the public to help identify potential tax fraud. If you suspect an individual or business is not complying with the tax laws, you may report this information anonymously to us.
Online referral forms
When reporting any type of suspicious activity or identifying remote sellers that should be collecting sales or use tax, please provide as much information as possible to assist us in properly identifying the taxpayer and the reason the individual or business is being referred. Examples include: the name and address of the suspect or remote seller, why you think tax fraud is being committed, how much money is involved, any personal or financial information you have concerning the suspect, etc.
Email, Mail, or Fax:
Use the button on the upper right corner of the form to send via email. These forms may also be mailed or faxed to us, see the mailing address and fax number listed on each form.
Your identity can be kept confidential. However, it helps if you provide your contact information in case we have questions about the information you submitted. Under state privacy laws, we can't disclose what, if any, action we take based on information you provide. We do not offer rewards for reporting this information.
Learn more about our
Protecting Taxpayer efforts. 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 visit the
IRS website for assistance.
January 10, 2019
Updates were made to the code or formatting on this page as of August 26, 2015. This date does not reflect the effective date or any other date relating to the content of this page.