We both filed form MO-NRI and marked Nonresident of Missouri, with Illinois as state of residence during 2021. We also both marked Remote Work (though my wife has no income).
We indicated zero Missouri income on page 2 of form MO-NRI.
As of this year, I have corrected my withholding to Illinois instead of Missouri. I no longer have Missouri withholding.
As for address, there is the address of the Missouri DOR on the letter head. That's it. No specific address is listed for me to file a protest. Our address on the form is our Illinois residence.
