You can notify DOR by mail or fax. Steps include:
When completing the form, include:
If you are only changing the business name on your account and your federal employer identification number (FEIN) did not change, provide the following information:
You may call our office at (608) 266-2776 to update your DBA. For legal name changes, fax the above information to (608) 327-0232, ATTN: Registration Unit, email
DORRegistration@wisconsin.gov, or mail it to the address below. We will mail you a new Wisconsin Business Tax Registration Certificate when we process your request.
If a new federal employer identification number (FEIN) is issued to you by the Internal Revenue Service (IRS), you must submit a new Wisconsin Business Tax Registration to DOR.
Note: If you are required to submit a new Business Tax Registration, you should inactivate the previous tax accounts once the new tax accounts are established.
Send changes to DOR using one of these methods:
If you have questions on how to update contact information for
government officials, contact us at (608) 266-8207.
To sign up for one of the department's email distribution lists,
Subscribe to DOR E-News.
This form is only for government entities. Businesses must update their bank information through
My Tax Account.
MS 5-77Wisconsin Department of Revenue Customer Service Bureau PO Box 8949 Madison, WI 53708-8949 Phone: (608) 266-2776 Fax: (608) 267-1030 Email:
October 11, 2023