Since all your income is taxed in your resident state, adding any income can impact your Kansas return, as well as your Federal return.
For your spouse's non-resident Missouri return, adding Nebraska income to your Federal return may change the federal AGI carried over to start the MO calculations, but should have no tax affect, since no MO income was added.
Here's more info on How to File a Non-Resident State Return and How to Amend a Tax Return and How to Undo an Amendment.
@tbrandt20
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