‘Everything Tax’ Vote Backfires In This State

August 5, 2026

When Missouri voters crushed Amendment 5 at the ballot box, they did more than reject a single tax proposal—they drew a bright line against using constitutional amendments to engineer a sweeping, under-specified shift from income taxation to consumption taxes.

Key Points

Amendment 5 would have phased out Missouri’s individual income tax and empowered lawmakers to expand sales and use taxes, with key design details left to future legislation.
An appeals court rewrote the official ballot summary to emphasize expanded sales-tax authority and the curtailing of constitutional limits on taxing goods and services, sharpening public focus on the tax shift.
Opponents framed the measure as a regressive “everything tax,” warning that replacing income tax with broader sales taxes would raise costs for working families and seniors.
Voters rejected Amendment 5 by an overwhelming margin—roughly 84% “no”—blocking lawmakers from using sales-tax expansion to abolish the state income tax.
The fight over Amendment 5 illustrates a recurring pattern in American tax politics: ballot measures that promise simple tax cuts while outsourcing the most consequential implementation choices to future legislatures.

What Amendment 5 Was Designed to Do

To understand why Missouri voters responded so decisively, you have to start with what Amendment 5 actually proposed to do. The measure would have amended the state constitution to require a legislative phase-out of the individual income tax based on revenue growth, ultimately driving the income-tax rate to zero and then prohibiting any future income tax unless voters later adopted a new constitutional amendment. In parallel, it would have authorized an expansion of the state’s sales and use taxes—both by allowing higher rates and by widening the range of goods and services subject to tax.

That basic architecture appears consistently across neutral and advocacy summaries. KCUR’s voter guide notes that the amendment “requires Missouri to phase out the individual income tax” and “authorizes expansion of sales and use taxes.” MO Equity Education Partnership’s explainer, written from an equity-focused lens, describes the same structure: phase out the individual income tax on revenue-growth triggers while granting lawmakers authority to broaden sales and use taxes to transactions not currently taxed. The underlying legislative resolution, House Resolution 173/174, reinforces this design by directing changes to Article X of the Missouri Constitution to eliminate the income tax and reconfigure sales and use taxes as the replacement revenue stream.

Crucially, the amendment did not spell out the detailed mechanics—specific rate schedules, exact lists of newly taxed services, exemptions, or offsets. Those granular choices were left to future statute. Supporters treated that flexibility as a virtue; opponents saw it as an open-ended delegation of taxing power.

How the Court’s Ballot Language Reframed the Proposal

Ballot measures often live or die on a few lines of official summary language. In Amendment 5’s case, the Missouri Western District Court of Appeals intervened to rewrite that language, and the revised summary made the scope of the tax shift far harder to ignore. The court required that the ballot question explain not only the income-tax phaseout but also the expansion of sales and use taxes and the curtailing of existing constitutional limits on taxing goods and services.

The Kansas City Star reproduced that revised ballot framing in its coverage: voters were asked if the constitution should be amended to “require legislative phase-out of the individual state income tax based on revenue growth, and authorize the expansion of sales and use taxes” and “curtail constitutional limits on taxing goods and services.” That phrase—“curtail constitutional limits”—is doing a lot of work. It signals to voters that existing tax-guardrail provisions, including voter approval requirements for certain tax increases, would be weakened or suspended for a period to allow the transition.

Governor Mike Kehoe’s own official statement on the appellate rewrite acknowledged the impact. His office noted that while the amendment stayed on the ballot, the court’s language ensured voters were explicitly informed that they would be granting lawmakers authority to impose new sales taxes without the current constitutional restrictions. In practical terms, this reframing validated one of the opposition’s central claims: that Amendment 5 was not just a tax cut, but also a reconfiguration of constitutional tax limits.

Supporters’ Case: Competitiveness, Growth, and Taxpayer Protection

Supporters of Amendment 5, led prominently by Governor Kehoe and a cluster of conservative organizations, anchored their argument in economic competitiveness and household income. Kehoe repeatedly described the measure as a “tax-cut amendment” aimed at putting more disposable income back into Missourians’ pockets and making the state more attractive for investment and migration. He tied the proposal to states like Tennessee that rely heavily on sales taxes rather than income taxes, suggesting Missouri needed to “evolve” its tax structure to compete.

In more detailed advocacy materials and videos, proponents framed Amendment 5 as containing two constitutional elements: a “guarantee” and a “possibility.” The guarantee was a requirement that excess state revenues be returned to residents through reductions in the income-tax rate, eventually driving that rate to zero and constitutionally prohibiting its reintroduction. The “possibility” was authority to accelerate that process by substituting consumption taxes—sales and use taxes—for income taxes within a controlled framework.

Supporters argued that taxing consumption rather than income aligns with longstanding conservative tax philosophy: it rewards saving and investment, avoids penalizing earnings, and, they contend, can be designed to be revenue-neutral overall. Advocacy materials emphasized that new or expanded sales taxes would be tied to reductions in income taxes; proponents said this would prevent net tax increases and constrain government growth. In their narrative, Amendment 5 was both a growth strategy and a taxpayer-protection package, locking a low-tax future into the constitution so it could not be easily reversed by a future legislature.

Opponents’ Case: A Regressive “Everything Tax” and a Blank Check

Opposition to Amendment 5 coalesced around a different reading of the same text: that abolishing the income tax through expanded sales and use taxes would shift the tax load downward onto working families, retirees, and middle-income households. The Institute on Taxation and Economic Policy (ITEP), a national research organization focusing on tax fairness, argued that the amendment would cut taxes for the wealthiest Missourians—who derive more of their income from investments—and increase taxes on the middle class and seniors who spend a larger share of their income on taxable goods and services.

Missouri-based groups echoed those concerns. Act4MO’s voter guide described the measure as rewriting the constitution to phase out the individual income tax while giving the legislature broad authority to expand the sales and use tax to goods and services not currently taxed, all during a five-year window when key voter-approval protections would be suspended. The group warned that this structure amounted to a “blank check” for lawmakers to tax everyday transactions—utility bills, service contracts, possibly healthcare or professional services—without requiring voters to sign off on each change.

Media explainers picked up the same themes. KCUR and other outlets noted that opponents feared higher consumer costs and a regressive shift in the state’s tax mix. AARP Missouri, representing older residents, explicitly framed Amendment 5 as “higher costs for Missourians,” emphasizing that retirees on fixed incomes would feel increased sales taxes more acutely than the elimination of income tax would benefit them. Legal and economic analysts interviewed on programs like “Legal Lens” underscored that while the amendment tied new sales-tax revenue to income-tax cuts, the net effect on different household types remained unknown and depended entirely on future legislative choices.

Opponents also focused on the temporary suspension or weakening of taxpayer protections embedded in the Hancock Amendment, Missouri’s constitutional provision requiring voter approval for major tax increases. Reporting from the Kansas City Star described how Amendment 5 would allow lawmakers, for five years, to raise or create new taxes without the usual voter-approval threshold, so long as those changes were offset by reductions in income tax. Critics argued that this effectively neutered Hancock’s role as a brake on tax-system overhauls and shifted the risk onto ordinary taxpayers.

The Vote: Overwhelming Rejection of the Tax-Shift Strategy

When Missouri voters went to the polls, the abstract debate around tax philosophy translated into a remarkably concrete electoral verdict. According to results reported by KCUR and other outlets, roughly 84% of voters marked “no” on Amendment 5, compared with about 16% “yes.” That is not simply a defeat; it is a landslide repudiation.

In practical terms, the amendment’s failure means lawmakers cannot use the mechanism it proposed—expanded sales and use taxes—to eliminate the state income tax under a constitutionally mandated schedule. The state’s existing tax structure, with the individual income tax generating a substantial portion of general revenue, remains intact, as do the Hancock Amendment’s voter-approval protections. Governor Kehoe acknowledged the setback but cast it as one round in a longer campaign, saying in his post-election statement that “our work is far from over.”

The magnitude of the “no” vote also shapes the narrative going forward. As analysts have observed, a defeat of this scale tends to harden public perception that the underlying plan was unpopular or flawed—not merely that the timing was wrong. In policy politics, numbers like 84–16 carry their own message: for now, Missouri voters do not trust sweeping constitutional tax redesigns that hinge on future sales-tax decisions.

The Broader Pattern: Tax Structure Fights and Constitutional Lock-Ins

Amendment 5 is not an isolated curiosity; it fits a familiar pattern in American tax politics. Across states, ballot measures that promise to “cut taxes” frequently do so by reshuffling the base—shifting from income to consumption or from state-level to local taxes—while leaving the hardest questions about rates, exemptions, and distribution to future legislation. The amendment then locks in the direction of travel, constraining later majorities absent another statewide vote.

That structure helps explain both the appeal and the backlash. For proponents, embedding a tax philosophy in the constitution secures long-term predictability for businesses and high-income households and limits what they see as the risk of fiscally aggressive future legislatures. For opponents, the same mechanism looks like handcuffing future voters to a design whose detailed consequences they have not yet seen, and whose incidence will vary sharply across income brackets, regions, and age cohorts.

Missouri’s fight over Amendment 5 foregrounded those tradeoffs in unusually explicit terms. The court’s ballot-language rewrite forced the tax-shift details into the spotlight; organized opposition translated complex fiscal arguments into intuitive fears about higher sales taxes on everyday life. Supporters offered high-level assurances about revenue neutrality and growth, but—on the public record available here—did not produce a Missouri-specific, modelled incidence analysis to prove that low- and middle-income households would come out ahead. In the absence of that kind of concrete modeling, many voters evidently sided with caution.

What This Means for Future Tax Overhauls

Looking ahead, the defeat of Amendment 5 is likely to influence how tax reform is pursued in Missouri and beyond. For lawmakers considering major structural changes, the lesson is straightforward: voters are skeptical of constitutional amendments that outsource too much of the design to future legislatures, especially when those amendments weaken existing taxpayer protections in the process.

For advocates of income-tax elimination, the path forward may involve more incremental, statutory approaches paired with transparent incidence studies that show, in detail, who pays what under various scenarios. For opponents of regressive tax shifts, Amendment 5’s failure provides both a cautionary tale and an organizing template: highlight the replacement mechanism, insist on distributional analysis, and scrutinize any proposal that couples constitutional permanence with short-term legislative discretion.

Most fundamentally, the Missouri experience underscores a basic truth about tax politics: voters care not just about how much government collects, but about how—and from whom—it collects it. When a proposal’s promise of “tax cuts” depends on a deep structural pivot whose winners and losers are not clearly mapped, the electorate may decide, as Missouri’s did, that the safest answer is simply “no.”

Missouri election results: See vote tallies on Amendment 4, Amendment 5 & more https://t.co/oIT1vhwlLJ

— The Kansas City Star (@KCStar) August 5, 2026