Missouri Voters Deliver Landslide Rejection to Governor Kehoe's Income Tax Phase-Out Plan

By Kurt Erickson
St. Louis Post-Dispatch
(TNS)

JEFFERSON CITY – Governor Mike Kehoe embarked on a trade mission to Central America on Wednesday, his departure shadowed by a significant political setback following the overwhelming rejection of his signature legislative priority for the year. Voters decisively turned down a proposed constitutional amendment that aimed to initiate the phasing out of Missouri’s state income tax by empowering lawmakers to increase sales and services taxes.

The ballot measure, designated as Amendment 5, garnered the support of only one in five voters, a stark repudiation of the governor’s ambitious tax reform agenda. As election results solidified Tuesday night, Governor Kehoe attempted to frame the outcome as a temporary pause rather than a definitive end to his efforts to enhance Missouri’s economic competitiveness.

"I remain committed to working with the General Assembly in the years ahead on ways to continue cutting taxes, growing our state’s economy, and pursuing conservative policies that help Missouri families keep more of what they earn," the Republican governor stated before commencing his four-day trip to Panama.

A Pattern of Setbacks for the Governor

This decisive defeat of the income tax phase-out initiative marks the third instance where Governor Kehoe has championed a significant proposal, only to see it falter in the face of public or legislative opposition. Beyond the failed Amendment 5, he also lent his support to the unsuccessful Amendment 4, which sought to impose stricter requirements for amending the state constitution. Last year, his efforts to rally Republican support for a new stadium for the Kansas City Chiefs ultimately proved unsuccessful when the team opted for a more financially advantageous offer from Kansas.

Despite these recent legislative challenges, House Majority Leader Alex Riley, a Springfield Republican poised to become Speaker of the Missouri House in January, expressed confidence that the rejection of Amendment 5 would not diminish Governor Kehoe’s influence within the legislature. "I wouldn’t go so far as to say this weakens Kehoe in the legislature. Governor Kehoe is widely respected in the House and Senate. We work really well with him," Riley told the Post-Dispatch.

However, Riley acknowledged the uncertainty surrounding the path forward for future income tax reduction strategies. While maintaining that such cuts will likely remain a priority, he indicated that the approach would need to be fundamentally different from the one decisively rejected by voters. "I certainly think it is unlikely that there will be a constitutional amendment proposal," Riley stated. "It’s going to be back to the drawing board to see what that might look like."

The Mechanics and Flaws of Amendment 5

Governor Kehoe’s proposed Amendment 5 would have granted the General Assembly the authority to expand state sales and use taxes without requiring additional voter approval. The objective was to generate sufficient revenue to compensate for the approximately $9 billion collected annually from Missouri’s 4.7% individual income tax. Notably, the proposal explicitly excluded the state’s corporate income tax from these changes.

The amendment was strategically placed on the ballot for the August 4th primary election, rather than the November general election. Governor Kehoe’s rationale for this timing was to provide lawmakers with ample time to prepare for the proposed tax restructuring should the amendment pass. The proposal, however, faced significant opposition from Democratic lawmakers and was met with skepticism from the outset.

A primary criticism leveled against Amendment 5 was the lack of transparency regarding the potential impact on consumers. Supporters of the amendment declined to provide specific projections on how much sales taxes would increase beyond the state’s current 4.225% rate, nor did they offer details on potential increases in service taxes. This ambiguity left voters uncertain about the financial implications for their households, a critical concern for many amid prevailing economic affordability challenges.

Expert Analysis of the Vote

Political scientists and observers largely attribute the resounding defeat of Amendment 5 to its inherent flaws and the public’s distrust of the proposed trade-off. Dr. Ken Warren, a political scientist at Saint Louis University, characterized the amendment’s substance as "awful" and suggested that voters saw through its intentions. "Give credit to the people. They saw through Amendment 5," Warren commented, adding that "there was nothing Kehoe could do to save a bill that was so flawed."

Missouri Voters Rejected the Governor’s Income Tax Plan. Could He Have Saved It?

Governor Kehoe actively promoted the amendment, participating in town hall meetings and numerous media interviews. Senate President Cindy O’Laughlin, R-Shelbina, acknowledged the governor’s promotional efforts but pointed to voter skepticism as a key factor. "I think people didn’t know what the alternative would be. People need those answers before they feel comfortable voting for a big change," she remarked. "The governor made his case."

The voting patterns across Missouri mirrored the statewide trend. Across the state, 83% of voters cast "no" votes on Amendment 5. This sentiment was particularly strong in the St. Louis metropolitan area, with the city of St. Louis, St. Louis County, and Jefferson County all reporting opposition margins exceeding 80%. Even in St. Charles County, a region that generally leans Republican, the amendment was defeated by a substantial 78-21 margin.

Public Trust and the Future of Tax Policy

Analysts suggest that the vote underscores a fundamental lack of public trust in lawmakers’ ability to implement tax policy changes that would ultimately benefit constituents. Dr. Peverill Squire, a political scientist at the University of Missouri, stated, "Amendment 5 crashed and burned because it offered nothing but empty promises. It was predicated on an idea that voters could trust the people in Jefferson City to develop a new, better revenue system. Obviously, Missourians lacked confidence that such an improved system could be devised."

Squire further posited that these repeated electoral setbacks should prompt a re-evaluation of the state’s political direction. He advised that "the governor may want to move back toward more traditional Main Street Republican positions as he looks to 2028."

Concerns were also voiced regarding the potential disproportionate impact of the tax shift on lower-income Missourians and senior citizens. Sena Snipes, an Amazon warehouse worker and official with the Missouri Workers Power organization in St. Louis, articulated the perspective of many working individuals. "For somebody making what I make, cutting the income tax is worth pocket change. For the wealthy and corporations like the one I work for, it is worth a fortune, and I would have been the one paying hundreds more at the register to cover it," Snipes explained.

An internal analysis by the Institute on Taxation and Economic Policy, a Washington D.C.-based organization, estimated that senior citizens in Missouri would have faced an additional $335 million in annual tax burdens had Amendment 5 been approved. Jon Whiten, the deputy director of the institute, urged lawmakers to heed the voters’ decision. "Lawmakers should respect the voters’ decision and abandon efforts to shift taxes away from wealthy households and onto families who spend most of their income on necessities. Missouri needs tax policies that make life more affordable, adequately fund public services, and ask those with the greatest ability to pay to contribute their fair share," Whiten stated.

Opposition Voices and Political Ramifications

The Missouri Association of Realtors, which spearheaded the opposition to Amendment 5, characterized the vote as a clear expression of public will. Scott Charton, a spokesman for the association, declared, "The people are in charge, the majority rules, and every citizen’s vote counts equally. Missouri voters just made clear they won’t let Republicans rewrite the rules to protect their own power and line the pockets of the ultra-wealthy."

House Minority Leader Ashley Aune, D-Kansas City, suggested that the overwhelming defeat of both Amendment 4 and Amendment 5 should serve as a warning to Republicans heading into the November general election. "The overwhelming defeat of Amendments 4 and 5 should surprise no one, and neither should the electoral consequences that are coming for lawmakers who voted for these schemes over the will of their constituents. In November, voters have the chance to send another powerful message to Jefferson City Republicans: If you mess with Missourians’ rights, you will pay the political price," Aune asserted.

Echoing Riley’s sentiment regarding future tax policy, House Majority Leader Riley reiterated that while interest in income tax reduction persists, the approach to achieving it must be fundamentally altered. "I don’t think it will look like this did," he concluded, signaling a retreat from further constitutional amendment proposals for the immediate future. The governor’s trade mission to Central America, therefore, begins at a time when his domestic policy agenda has faced a significant public rebuff, setting the stage for renewed debate and strategic recalibration within the Republican party.

Photo caption: Missouri Gov. Mike Kehoe and his wife, Claudia, are pictured casting their ballots on August 4, 2026. (Governor Mike Kehoe/Facebook)