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Treasury: Annual State Individual Income Tax System Maintenance Begins on Thursday

Dec. 8, 2021

System upgrades in preparation for next year's individual income tax filing season will begin this week, according to the Michigan Department of Treasury.

Effective after 5 p.m. on Thursday, Dec. 9, the state Treasury Department will suspend processing state individual income tax refunds due to annual tax processing system upgrades required for the upcoming 2022 tax filing season. Individuals will be able to check the status of their refunds or returns after Jan. 10, 2022.

Most timely filed refunds for tax year 2020 have been processed.

"I want to first and foremost thank taxpayers for their patience as we conduct our annual system upgrade in preparation for the 2022 individual income tax filing season," said Deputy State Treasurer Glenn White, who oversees the state Treasury Department's Revenue Services programs. "As soon as we are operational again in January, we will resume processing tax returns and issuing refunds. We look forward to serving taxpayers in the new year."

At the close of each calendar year, the Michigan Department of Treasury undergoes system maintenance in preparation for the upcoming individual income tax filing season. The Internal Revenue Service and other states have similar end-of-the-year maintenance schedules.

For the 2021 filing season, the state Treasury Department processed nearly 5 million 2020 tax year individual income tax returns, processing 3.4 million refunds and providing an average refund of $634.

Individuals who are eligible for unemployment tax treatment due to the federal American Rescue Plan Act and have yet to adjust their 2020 state individual income tax return are encouraged to file their amended returns as soon as possible. An amended state tax return could reduce the amount of tax owed or provide a tax refund for 2020 state individual income taxes.

To learn more about Michigan's individual income tax, go to


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Press Contacts: Danelle Gittus or Ron Leix, Treasury Public Information Officers, at 517-335-2167