They also tax senior’s Social Security payments.
Elections have consequences.
Taxing SS was up a few years back and did not pass.
Illinois does not tax distributions received from:
qualified employee benefit plans, including 401(K) plans;
an Individual Retirement Account, (IRA) or a self-employed retirement plan;
a traditional IRA that has been converted to a Roth IRA;
the redemption of U.S. retirement bonds;
state and local government deferred compensation plans;
a government retirement or government disability plan, including military plans;
railroad retirement income;
retirement payments to retired partners;
a lump sum distribution of appreciated employer securities; and
the federally taxed portion of Social Security benefits
https://www2.illinois.gov/rev/questionsandanswers/Pages/99.aspx