How do I apply for an EIN?

How to Apply for an EIN in Wisconsin

An Employer Identification Number (EIN) is essential for most businesses in Wisconsin to handle taxes, payroll, and banking. It is issued by the IRS and identifies your business for federal tax purposes.

Steps to Apply for an EIN

• Determine Eligibility: Your business must be located in the United States or U.S. territories and have a valid Taxpayer Identification Number (such as a Social Security Number).
• Gather Required Information: You will need your business legal name, address, type of entity, and the name and SSN or ITIN of the principal officer or owner.
• Apply Online: The fastest and most efficient method is to apply through the IRS EIN Online Assistant available on the IRS website. This service is available Monday through Friday during business hours.
• Apply by Mail or Fax: Alternatively, you can complete IRS Form SS-4 and send it by mail or fax to the IRS. Processing times are longer compared to the online method.
• Receive Your EIN: If applying online, you will receive your EIN immediately upon completion. For mail or fax applications, expect a processing period of up to four weeks.

Operational Considerations for Wisconsin Businesses

• Business Registration: After obtaining your EIN, register your business with the Wisconsin Department of Financial Institutions if required for your business type.
• State Taxes and Payroll: Use your EIN to register for Wisconsin state taxes and unemployment insurance with the Wisconsin Department of Revenue and Department of Workforce Development.
• Recordkeeping: Keep your EIN confirmation letter securely as it is necessary for tax filings, opening business bank accounts, and payroll setup.
• Compliance: Ensure your EIN is used consistently on all federal and state tax documents to maintain compliance and avoid processing delays.

As of 2026, applying for an EIN remains a straightforward and essential step for Wisconsin businesses to establish their federal tax identity and streamline operational processes such as payroll and tax reporting.