How to Find a Wisconsin Business Tax Identification Number

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You can also see how often a business has filed under that ID number.
You can also see how often a business has filed under that ID number. (Image: eyegelb/iStock/Getty Images)

Businesses, like individuals, must file taxes with the federal government and their respective state governments. In Wisconsin, businesses need a tax identification number to file taxes with the Wisconsin Department of Revenue. You can find a business’ tax identification number through the Department of Revenue website.

Visit Department of Revenue Website

Navigate to the Wisconsin Department of Revenue website and click on the “Businesses” tab. Next, click on the link for “Look up Wisconsin tax number and filing frequency.” Pick the “Look up account number and filing frequency” link on the next page.

Enter Information

Choose whether you want to look up filings for withholding or sales tax. If the business is a sole proprietorship, choose the option to search by Social Security number. Otherwise, choose to search by the business’ federal employee identification number. Enter whatever ID number you chose, as well as the business’ name or sole proprietor’s last name and zip code. If you get a “no information available” message, either the information entered was incorrect or no tax data exist for that company.

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