The Michigan Department of Treasury (Michigan Treasury) has created a cause for confusion for some of its individual taxpayers with the incorrect distribution of notices regarding tax payments, adjustments or other filing inconsistencies. The Michigan Treasury is aware of concerns regarding these notices and is working to address the issue.  

In the meantime, our Michigan CPAs have compiled these FAQs to guide taxpayers on next steps should they receive a notice. 

How did the error happen?  

Beginning this year, the Michigan Treasury introduced a new online tax system for individual taxpayers as part of its efforts to modernize filing and improve security. This system replaced the previous individual income tax online services, however, has experienced some hiccups as part of the rollout.  The state has paused the programming which caused the problematic notices until future testing and input has been incorporated. 

Who is receiving incorrect notices?  

According to the Michigan Treasury, at least 27,000 individual taxpayers were incorrectly issued a Notice of Adjustment letter related to estimated payments, prior-year overpayments, payments submitted with returns, retirement and pension subtraction issues, property tax credit adjustments, underpayment of estimate penalties and refunds, and other inconsistencies, between April 7, 2026, and April 28, 2026.  

While some Michigan taxpayers may have received a notice by mistake, there are legitimate notices being mailed out too, so be sure to follow up accordingly.  

How can I confirm whether the notice is legitimate? 

If you believe you have received a notice in error, taxpayers are advised to either notify their dedicated individual tax accountant or visit Michigan Treasury eServices to see real-time information related to their account. Any erroneous notices have been removed from those shown on Michigan Treasury eServices. Corrected letters, dated May 19, 2026, have also been mailed to impacted taxpayers. 

What should I do if I receive an unexpected refund check?  

If a taxpayer receives an unexpected refund, whether in the form of a check or direct deposit, they should return that payment and notify the Michigan Treasury via Michigan Treasury eServices as soon as possible. To return a payment to the Michigan Treasury, mail the uncashed check and a statement on why you are returning the check such as “Refund issued in error” to: 

Michigan Department of Treasury 
Office of Financial Services 
P. O. Box 30788 
Lansing, MI 48909 

Here to Help  

Our Michigan-based individual tax pros continue to monitor updates from the Michigan Treasury as they work to resolve the issue. Taxpayers can also visit the organization’s dedicated Solutions Tracker page, which provides the latest information about identified issues and solutions. If you receive a notice and would like to obtain support, contact us today.