In Illinois retirement distributions aren't taxable even if you live in Illinois.
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In addition, a SCOTUS decision provided states can't tax non-residents on retirement distributions
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The Pension Income Tax Limits Act (PITLA), enacted after December 31, 1995, prohibits states from imposing income taxes on certain retirement income for individuals who are not residents or legally domiciled in that state. In other words, if you receive retirement distributions from a state retirement plan and you are a non-resident at the time of receipt, those distributions may not be subject to that state's income tax
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don't even bother to file an Illinois return unless you have other Illinois source income
