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Corporate Income Tax - Ask a Question

Update Account

Access Michigan Treasury Online (MTO) to make a payment, manage Treasury business tax account information, and authorize a representative/power of attorney.

Michigan Treasury Online

Ask a Question

Taxpayers can utilize the Business Taxes eService to ask Treasury general or account-specific questions related to corporate income tax (CIT). Treasury provides responses to these questions electronically within 7 business days. If your question is related to a letter you received from Treasury, have a copy of the letter available to provide the Letter ID.

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

Business Taxes eService

Other ways to contact Treasury for CIT Tax


Michigan Department of Treasury
P.O. Box 30059
Lansing, MI 48909