New Company Registration for Wisconsin

Disclaimer: This article is not intended to be tax, legal, financial, or HR advice. Rules and regulations change over time and can vary by location. Consult with a lawyer, accountant, Tax, or HR expert for specific guidance.

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Register for Taxes with Middesk

Homebase has partnered with Middesk to make tax registration easier for you.

• Middesk can register you across all 50 states for withholdings/income tax (SIT) and unemployment insurance (SUI)
• Middesk will continue to support your ongoing compliance by processing and surfacing your state mail for your review
• Middesk offers registrations for select PFMLs and local jurisdictions as well

To get started, sign up here and check out this tutorial.

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Wisconsin Withholding Tax & State Unemployment Insurance Tax (Combined)

For registration with both the Wisconsin Department of Revenue and the Wisconsin Department of Workforce Development, go through the state’s One Stop Business Registration.

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Wisconsin Withholding Tax

Tax Agencies: Wisconsin Department of Revenue & Wisconsin Department of Workforce Development

Obtaining a Wisconsin Withholding Tax Account Number Online

• For registration directly with the Wisconsin Department of Reveneu, go through My Tax Account, the agency’s online application for filing and paying business taxes.
  • In most cases, the employer will receive an email containing the account number within 1-2 business days.

Obtaining a Wisconsin Withholding Tax Account Number Via Paper Form

• Fill out Form BTR 101, Application for Wisconsin Business Tax Registration.
• Mail to the agency.
• Allow 15 business days for processing of paper applications.

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State Unemployment Insurance (SUI) Tax

Tax Agency: Unemployment Insurance Division of the DWD

Obtaining a Wisconsin SUI Tax Account Number Online

Employers can register directly with the Wisconsin DWD on the agency’s website, UI Employer Online Services.

• • User Guide for Online Registration

Obtaining a Wisconsin SUI Tax Account Number Via Paper Form

Fill-in Form UCT-1-E, 2021 Wisconsin Employer Report, is used by Wisconsin employers to apply for a SUI account number and register a Wisconsin based business.