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Registration - 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

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.

Update Account

Make updates to your account on Michigan Treasury Online.

Contact Us

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

Call Us

Phone Number



Mail Us

Mailing Address

P.O. Box 30427

Lansing, MI 48909