JEFFERSON CITY, Mo. (AP) – A Missouri judge is preparing to hear arguments on a proposed ballot measure that would replace the state’s income tax with a broader sales tax.

The case focuses on the summary that would appear on the ballot and the cost estimate. Cole County Circuit Judge Pat Joyce scheduled a hearing on those issues Thursday morning.

The group Let Voters Decide is working to put a state constitutional amendment on taxes before voters later this year. Supporters have until early May to gather enough signatures to get the measure on the ballot.