Advocates have been moving for months to give Illinois a progressive income tax. Instead of the same flat rate for everyone, those who make more would pay more.
Backers of the plan argue most Illinoisans would get a tax cut.
Senator Don Harmon, a Democrat from Oak Park, says this provides the state a new choice, instead of extending the 2011 income tax hike or making deep cuts to services.
"We can continue an unfair, regressive tax at 5 percent, or we can cut government services, the services upon which folks rely by 20 percent across-the-board," Harmon said.