Because you worked in Illinois while you lived in Missouri part year 2024 and then moved and worked in Texas, you must choose-
File as a part-year resident Missouri return, where all your 2024 yearly income will be taxed by Missouri and a credit for the tax paid to Illinois is available.
This means the income from Texas will be taxed on the Missouri return with no state tax credit on the Texas income.
or
File as a part-year non-resident and only pay tax on the income earned while you lived in Missouri (and worked in Illinois) with no tax credit available.
This means only the income you earned in Illinois will be double-taxed, not the income from Texas.
According to the state of Missouri:
"I was a resident of Missouri working in Kansas. In May, I moved to Texas. What forms are needed for filing my Missouri return?"
"You must complete Form MO-1040, along with either Form MO-CR (Missouri resident credit) or Form MO-NRI (Missouri income percentage), whichever is to your benefit. Remember, you cannot claim both. As a part-year Missouri resident, you may claim a resident credit for taxes paid to Kansas, leaving the income earned in Missouri and Texas as taxable income on your Missouri return; OR you may claim a Missouri income percentage, taxing you only on the Kansas income you earned while living in Missouri. Be sure to calculate your Missouri return using both Forms MO-CR and MO-NRI to determine which will result in the lowest Missouri tax liability."
@Andrew N
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