The Michigan Department of Treasury has been made aware that some "Reminder of Tax Due" letters sent to taxpayers contain an incorrect toll-free (1-800) TTY number, which may connect callers to a potential scam. Taxpayers with questions regarding unpaid individual income taxes are asked to contact the Treasury directly at 517-636-4486. We apologize for any confusion or concern this may have caused.
Business Registration Contact Form
Contact Business Tax Registration
Send an email to a business tax customer service registration representative for general questions or account related information.
Letters regarding your 2021 filing frequency have been issued. If the filing frequency on the letter is consistent with how you are currently filing, please disregard that notice. Use the form on this page or contact Registration at 517-636-6925 if you need additional information.