The extension deadline to file your state individual income tax is today, Oct 15. The Michigan Department of Treasury is reminding Michiganders that if you requested an extension on your filing, the deadline to complete it is today.
As of Oct. 12, Treasury has processed more than 5.2 million individual income tax returns and issued $3.89 billion in refunds. Individual income tax returns are received and processed year‑round, with most arriving between late January and April 15 during the filing season.
State individual income tax returns due under an extension must be received by the Treasury on or before Oct. 15, 2026. Returns can be sent through the U.S. Postal Service postmarked today or e-Filed.
