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State tax filing
if you claim to be domiciled in Illinois (Domicile (Home of Record) - The place an individual intends to be his/her permanent home; a place that he/she intends to return whenever absent. A domicile, once established, continues until the individual moves to a new location with the true intention of making his/her permanent home there. An individual can only have one domicile at a time) IE you intend to return after your stint in MO you are a full-year Illinois resident.
for Misssouri, you don't meet its definition of non-resident so you would be a part-year resident.
the result: you file a Mo return as part-year resident only reporting your income earned there. this return must be prepared before Illinois. for Illinois yo pay tax on the MO income and then get a credit for the income taxed by both Il and Mo.