Wisconsin Franchise Tax Information

For corporations, Wisconsin has a couple of filings that resemble franchise taxes, either in name or format, that are typically filed by an accountant: an annual report filing and a franchise tax filing.

Wisconsin's complex annual report for corporations

Foreign-registered corporations in Wisconsin must report on "Capital representation" in Wisconsin on the state's annual report (Form Corp18), which is used to calculate the filing fee. It requires detailed financial information; as a result, this is typically filed by an accountant.

When is Wisconsin's annual report due?

Foreign corporations must file their annual report by March 31 each year. 

The first annual report is due during the first calendar quarter following the entity's initial registration in Wisconsin. 

For example, if the entity registered in Wisconsin on February 1, the first annual report would be due March 31 of the following year, and then annually by March 31 thereafter.

Failure to file the annual report can result in administrative dissolution or revocation of authority to do business in Wisconsin.

Wisconsin’s franchise tax

Wisconsin also has franchise taxes that must be filed each year for certain entities. Wisconsin’s franchise tax more closely resembles corporate income taxes than the average franchise tax filing in other states. The state has a concise Q&A on corporate taxes on its website.

For corporations, Wisconsin franchise taxes are typically filed by an accountant, as they are virtually identical to corporate income taxes. A corporation will only pay franchise taxes or corporate income taxes in a given year, not both.

Talk to your tax accountant to determine which tax you may owe. Franchise tax applies to foreign corporations (that are not tax-exempt) doing business in Wisconsin, as well as to domestic corporations. 

Exemptions

Certain entities are exempt from Wisconsin franchise and income taxes, including:

  • Certain nonprofit organizations
  • Insurance companies subject to premium taxes
  • Other entities specified under Wisconsin statutes

Consult with your tax advisor to determine if your entity qualifies for any exemptions.

When are Wisconsin franchise taxes due?

Form 4 and 6 (Corporation franchise or income tax return) are due:

  • April 15th if your taxable year end is December
  • Otherwise, the 15th day of the 4th month after the end of the taxable year
  • For fiscal years ending June 30: 15th day of 3rd month after end of fiscal taxable year (September 15)

Penalties for non-compliance

Wisconsin imposes penalties for late or missed franchise tax filings, including:

  • Late filing penalties and interest charges
  • Administrative dissolution or revocation of authority for continued non-compliance
  • Loss of good standing status with the Department of Financial Institutions

Discern helps you track Wisconsin compliance

Wisconsin's dual reporting requirements (annual reports to DFI and franchise taxes to DOR) create ongoing compliance obligations that multiply when managing entities across multiple states. 

While Discern does not file Wisconsin franchise taxes (these require an accountant due to the detailed financial information involved), Discern can file your Wisconsin annual reports, notify you when franchise taxes are due, and provide guidance and tracking to help you stay compliant.

Ready to simplify your multi-state compliance? Book a demo to see how Discern streamlines entity management across all 50 states and DC.

A picture showing CTA Wisconsin Guidance Review
Author
The Discern Team
Published Date
November 28, 2025
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