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Ask a Question

Access the eServices Business Tax Portal

eService Business Taxes is a portal where you can ask account specific or general questions that Treasury can reply to electronically. To submit a question, you will need details about the business and the Letter ID off any notice being referenced. Online responses to questions may take seven business days to be available. If Treasury is unable to verify the information provided, the response will include a request to resubmit with updated information.

For additional resources and helpful information visit the Business Tax eServices Portal Help Center.

Update Account

Make updates to your account on Michigan Treasury Online

Log on to Michigan Treasury Online (MTO) to update business details, authorized representative information, and to file or pay tax returns.

Other ways to contact the Department of Treasury


Michigan Department of Treasury
P.O. Box 30427
Lansing, MI 48909