2015 Tax Periods and Later
Michigan Treasury Online (MTO) and the Business Tax Call Center will be unavailable from 5 p.m. on Wednesday, August 29 until 8 a.m. on Tuesday, September 4, 2018. This outage is necessary for system/server maintenance and no business tax records will be accessible during this planned outage. We anticipate a higher than normal call volume on September 4-7 and appreciate your patience if you experience an extended call wait time. Once complete, this maintenance should not have any additional impact on taxpayers.
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