Michigan - Timeframe to Keep Copy of Return and File for Refund
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For Michigan returns, you must file for a refund within four years of the due date of the return and keep a copy of your return and all supporting schedules for six years.
If you are due a refund, you must file a return within four years of the due date to obtain the refund. Keep a copy of your return and all supporting schedules for six years.
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