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Web most commonly used forms & instructions. Web search by tax area: Use this option to browse a list of forms by tax area. Web find individual and fiduciary income tax forms and instructions for the 2023 tax year and previous years. For example, if you are interested in individual. Application for extension of time to file michigan tax returns. This form is used by michigan residents who file an individual. Web 69 rows michigan has a flat state income tax of 4.25%, which is administered by the michigan department of treasury.