In 2014, lawmakers put a similar advisory referendum on the ballot calling for state millionaires to pay 3% on income exceeding $1 million, with proceeds specifically earmarked for schools. Nearly two-thirds of voters on that question — 64% — backed the idea.

The question asks if the state constitution should be amended to create an additional 3% tax on income greater than $1,000,000.

Illinois voters approved three nonbinding ballot questions, including one asking whether the highest earners should be taxed to fund property tax relief.

The measure calls for the creation of a 3% tax on individual income over $1 million to use to reduce the property tax burden.

The ballot asked if voters would support a 3 percent surcharge on incomes over $1 million to support property-tax relief.