Business Taxes IconRegistration - Ask a Question

  • For account specific questions, you will need to include the business's identification number and address as well as your relationship to the business. Additionally, if responding to a notice we sent to you, include the Letter ID printed at the top of page one.

    For SUW account specific questions, visit

  • Ask a Question

    Ask a General Question Online

    Online responses to questions cannot contain any sensitive information and may take up to five business days to be available. Account-specific responses will instead be mailed to the legal address on your account.

Other ways to contact the Department of Treasury with questions about your business taxes.

  • Phone Number

    Call Us



  • Mailing Address

    Mail Us

    P.O. Box 30427

    Lansing, MI 48909