If you both filed separately, you and your spouse would have two different set of returns. It is not a combined form. Therefore, you would enter your information in one return and your spouse's income in another. There is no allocation or calculations necessary. Since each return will only show their tax information, each return would be calculated specifically for each spouse.
Both of your returns would still need a 1040 and an Iowa return.
For more information, please see How do I switch from filing jointly to filing separately?
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