Business Taxes IconMBT/CIT - Ask a Question

  • For account specific questions, you will need to include the business’s indentifcation number and address as well as your relationship to the business. Addtionally, if responding to a notice we sent to you include the letter ID and/or Notice Date printed at the top of page one.

  • 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.

  • Review Our Response

    Review Our Response to Your Question

    To retrieve our response to your question, you will need the Service Request number that was sent to you via email after submitting your question, as well as the email address and phone number that you used when you initially asked the question.

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 30059

    Lansing, MI 48909