In 2019 (at least) Iowa had an "alternate tax calculation" (I don't know if this continued after 2019).
You have two choices: (1) look in your PDF output (I assume you saved it) for a worksheet called "Alternate Tax Calculation". If not, look on your IA 1040 just above line 39 and see if there is a smart worksheet called Alternate Tax Calculation.
If neither of those work, come back and tell us.
@stilllearningtaxes
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