How do I contact Treasury for Michigan Business Tax (MBT) matters?

Important: Unless otherwise noted in "Why was my MBT return adjusted?" FAQs, if additional information is required to adjust or correct the original return, a complete amended return, including all forms, schedules and attachments must be submitted to the MBT Returns address below. Please remember to mark the box on the first page of the return to indicate that this is an amended return.

• Michigan Business Tax Correspondence Address (No MBT Returns):
  • Customer Contact Division, MBT Unit
    Michigan Department of Treasury
    P.O. Box 30059
    Lansing, MI 48909

• Michigan Business Tax Returns:

With Payment:

• Michigan Department of Treasury
  P.O. Box 30113
  Lansing, MI 48909 

Without Payment:

• Michigan Department of Treasury
  P.O. Box 30783
  Lansing, MI 48909
   
• Michigan Business Tax Phone Number:
  • 517-636-6925
     
• Collections Phone Number:
  • 517-636-5265

• Collections Correspondence Address:
  • Michigan Department of Treasury
    Collection Division
    P.O. Box 30199
    Lansing, MI 48909