Beginning on January 7, 2019 Streamlined Sales Tax Simplified Electronic Returns will need to be filed and paid using Michigan Treasury Online at mto.treasury.michigan.gov. Effective on that date, the current Simplified Electronic Return Electronic Filing site will no longer be available. Please log in early to Michigan Treasury Online to establish a Username and Password. You can direct any question to the Michigan Department of Treasury at (517) 636-6925.
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