Michigan Treasury Mistakenly Sent 27,000 Tax Adjustment Letters

Roughly 27,000 Michigan taxpayers received erroneous "Notice of Adjustment" letters from the state this month. The Michigan Department of Treasury confirmed the mistake was caused by a system change.

The letters, dated April 7 and April 28, 2026, indicated that state tax refunds had been changed. Typically, such notices mean a refund was applied to a state debt like unpaid taxes, child support, or agency fees.

What Taxpayers Need to Know

The good news: taxpayers do not need to take any action. According to Treasury officials, the error was limited to the letters themselves. All taxpayer prepayments are correctly accounted for and properly listed in Michigan Treasury eServices.

"Taxpayer prepayments are accounted for, and are correctly listed in Michigan Treasury eServices," the department stated. Corrected letters will be issued soon.

How to Check Your Account

Residents can verify their tax status through the state's online portal:

• Visit Michigan Treasury eServices
• Access the Citizen Portal to view refund status and tax records
• Check that estimated payments and credit carry-forwards are properly recorded

The eServices portal allows taxpayers to file state returns, make electronic payments, view records, and communicate directly with Treasury.

What Is a Notice of Adjustment?

A "Notice of Adjustment to Income Tax Refund or Credit" is an official state letter indicating that a tax refund has been modified. Common reasons include:

• Application to unpaid state taxes
• Child support debt
• Other state agency fees

In this case, the notices were sent in error due to a technical glitch during a system upgrade.

Frequently Asked Questions

Q: Should I respond to the Notice of Adjustment letter?
A: No. The Michigan Department of Treasury says taxpayers do not need to take any action at this time.

Q: How can I verify my tax prepayments are correct?
A: Log into Michigan Treasury eServices to view your account status, refund information, and payment history.

Q: Will I receive a corrected letter?
A: Yes. The Treasury department is issuing corrected letters to all affected taxpayers.