04/29/2026
The State of Michigan has sent out approximately 27,000 letters with the wrong information. See below
Michigan Treasury Letter Error — What You Need to Know
Michigan taxpayers have received erroneous “Notice of Adjustment” letters from the Michigan Department of Treasury due to a system change. About 27,000 letters were sent between April 7 and April 28, 2026, and in some cases between March 30 and April 17, 2026, depending on the batch WZZM13+2.
What the Letters Said
The letters incorrectly indicated that:
Your 2025 tax return had been adjusted.
You may have estimated payments due or credit carryforwards.
In some cases, they claimed refunds had been cut or that you owed money, even though your bank records and payment history showed otherwise Hoodline+1.
Why the Error Happened
The Michigan Treasury confirmed the issue was confined to the letters themselves, not the underlying tax filings or prepayments. The problem was caused by an unintended change during a system update WZZM13+2. Your actual tax account in Michigan Treasury eServices remains correct.
What You Should Do
No action is required at this time — the Treasury says you do not need to respond WZZM13+1.
Corrected letters will be issued soon WZZM13+1.
If you received an uncashed refund check in the letter, do not cash it. Return it with a written explanation to:
Michigan Department of Treasury, P.O. Box 30788, Lansing, MI 48909 Hoodline+1.
Check your bank records and log in to Michigan Treasury eServices to confirm your prepayments and refunds are posted correctly Hoodline+1.
If you have questions, contact the Individual Income Tax Contact Center at 517‑636‑4486 or submit an inquiry online Hoodline+1.
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