The statute of limitations for Michigan is 6 years.
Yes, if you did not properly report income and expenses, you would need to go back and amend the returns for the past 6 years.
The years that you owe, you would have to pay along with interest and penalties.
However, for refunds, you can only go back 4 years. You would still make the changes to the other returns, but you would not get the refund if it was on a return further back than 4 years of when the return was due.
For the IRS, the time you need to go back will depend on how much you are off. If you are off by 25% or more, then you would need to go back 6 years. If it is less than 25%, then they go back 3 years. You can also only claim a refund for up to 3 years back.
If you do not have the previous years version of TurboTax you can still download 2021, 2022 and 2023 here.
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