Missouri voters face constitutional amendments and congressional-map fight in Aug. 4 primary
Missouri voters will decide four certified constitutional amendments in the state’s Aug. 4, 2026 primary, with proposals concerning conservation funding, county assessors, the process for amending the state constitution and a framework for potentially eliminating state-imposed taxes.
The Missouri Secretary of State lists Amendments 1, 2, 4 and 5 as certified for the statewide primary ballot. The measures are proposals for voters to decide; no outcome was available as of Aug. 3.
Separately, a dispute involving Missouri’s congressional map was a major issue on the eve of the primary, according to Axios. The reviewed reporting establishes that the conflict is shaping the election-day environment, but does not establish the final legal status of any map question.
Conservation tax continuation
Amendment 1 would continue a one-tenth-of-one-percent sales and use tax for soil and water conservation and for state parks and historic sites. The proposed continuation would run for 10 years.
The official ballot language estimates that the tax would generate approximately $140 million annually. That figure is an estimate included in the ballot language, not a report of revenue already collected under a renewed tax.
Voters considering Amendment 1 are therefore deciding whether to continue the specified tax at a 0.1% rate for the stated purposes and period. The measure’s listed funding targets include soil and water conservation, state parks and historic sites.
Initiative-petition threshold
Amendment 4 would change the approval requirement for initiative petitions that amend the Missouri Constitution. Under the proposal, such a petition would need majority support in each of Missouri’s eight congressional districts, rather than a statewide majority alone.
The proposal concerns the process for approving constitutional amendments through initiative petitions. It does not, based on the ballot description reviewed, itself redraw congressional district boundaries.
The eight-district requirement is central to the proposed change: a statewide majority would no longer by itself satisfy the described standard for a constitutional initiative petition. Whether that requirement takes effect depends on the Aug. 4 vote.
County assessor and tax-fund measures
Amendment 2 concerns a requirement that charter counties, including Jackson County, elect a county assessor. The Secretary of State identifies the measure as one of the amendments certified for the primary ballot.
Amendment 5 concerns creation of the Show-Me Prosperity Fund. It also concerns a framework aimed at eliminating state-imposed taxes if earnings from the fund are sufficient. The ballot-stage measure would establish that framework; the reviewed materials do not establish that any state-imposed tax has already been eliminated.
Together, the certified amendments place several different questions of state governmental structure and finance before voters in a single primary election: whether to continue a designated conservation tax, how constitutional initiative petitions would be approved, how county assessors would be selected in covered charter counties, and how a proposed fund could be used in relation to state-imposed taxes.
What comes next
Aug. 4 is Missouri’s primary election date under the Secretary of State’s 2026 election calendar. The ballot measures listed for that election remain proposals until voters cast ballots and results are determined.
Missouri’s next statewide general election is scheduled for Nov. 3, 2026. The Secretary of State’s ballot-measures page lists a separate abortion-related constitutional amendment for that general-election ballot, rather than the Aug. 4 primary ballot.
The primary thus comes amid both immediate decisions on the four certified amendments and an unresolved congressional-map dispute that has become a prominent issue before voting. The available source material does not provide a final resolution of that map dispute.
Sources
- 2026 Ballot Measures, Missouri Secretary of State
- 2026 Missouri Election Calendar, Missouri Secretary of State
- Missouri’s map fight lands on primary election day, Axios