On Tuesday, August 4, Missouri voters participated in the state’s primary election. In addition to selecting each party’s nominees, they voted on four proposed constitutional amendments. Amendments 1 and 2 were approved by overwhelming margins, while Amendments 4 and 5 were rejected by similarly decisive margins.
- Amendment 1, approved by more than 80% of voters, extends the 0.1% sales tax that funds Missouri’s state parks and soil and water conservation programs.
- Amendment 2, approved by about three-fourths of voters, requires all county tax assessors to be elected officials. This change affects only Jackson County, where the assessor is currently appointed.
- Amendment 4 was rejected by more than 80% of voters. It would have changed the approval threshold for constitutional amendments proposed through the initiative petition process, making it more difficult to alter the Missouri Constitution.
- Amendment 5 was also rejected by more than 80% of voters. It would have gradually repealed the state income tax while authorizing legislators to expand sales taxes under certain conditions.
While the MCC did not take an official position on any of these ballot measures, the Missouri bishops issued a statement on Amendment 5 on July 17, 2026, outlining considerations for voters and encouraging the faithful to vote according to their consciences.
Amendment 3, the pro-life measure that seeks to limit the number of abortions in the state, restore health and safety safeguards for pregnant women, and prohibit gender-transition treatments and procedures for minors, was not on the August ballot and will appear on the November ballot instead.
Click here for the election results from the Secretary of State’s Office.