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
- Report suspected fraud by completing
Wisconsin Tax Information Referral Form.
- Report remote sellers that should be collecting Wisconsin sales or use tax by completing
Wisconsin Remote Seller Referral Form.
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.
Submit by Email, Mail, or Fax:
Use the button in the upper right corner of the form to send by email. These forms may also be mailed or faxed to us using the information 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 efforts to protect taxpayers. 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.
March 19, 2021
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.