Illinois has a 3% income tax on adjusted gross income. It is a mistake to say it is “one of the lowest in the nation” due to the fact we pay other taxes, too. Illinois counties collect property taxes and sales taxes on purchases (state and local).
Even if you say the Illinois state income tax is “lower” (We are rank 31 of 50 states), our property taxes are “higher” (10 of 50 states). Our state sales taxes are also ” higher” (16 of 50 states). I could not find information on where we rank with local sales taxes but… Shopping at Woodfield gets you a 10% tax on the goods purchases (which includes the 6.25% Illinois sales tax). We have to assume that Illinois is “higher” for local sales taxes.
It is important to look at “total tax burden” per individual or family or corporate entity. I got this information just “googling”.