The debate over whether Illinois should change its flat income tax to a structure taxing higher rates for higher earners is expected to be expensive as groups on both sides of the issue prepare for November 2020 election. Supporters have said the progressive income tax proposal will bring the state an additional $3.2 billion in tax revenue. Opponents have questioned those revenue projections. The proposed change will appear on ballots in November 2020. Voters will have the final say at the ballot box. (The Center Square)