The geniuses in IL used to have a tax rate of 5%. Then they decided to try and outdo Brownback and cut the IL tax rate. Kansas experiment https://en.wikipedia.org/wiki/Kansas_experiment As Dorothy said "Toto this doesn't look like Kansas". Well that didn't work so they raised the rate back up almost. lol https://www2.illinois.gov/rev/research/taxrates/Pages/income.aspx When the graduated State income tax arrives you will thank N. IL I've heard rumors about that since last December on supplemental income over $1M. The boys in Chicago will probably move to IN and work from home. That trickle down you are experiencing is someone peeing down your leg.