Missouri Amendment 5 rejection leaves tax law unchanged

The legal implication of Missouri Amendment 5’s rejection is the status quo. As of August 25, 2026, the August 4 vote did not amend the Missouri Constitution, did not repeal the individual income tax, did not change the 4.7% top individual income-tax rate, did not loosen the Hancock Amendment’s voter-approval limits, and did not remove the constitutional restriction on extending sales and use tax to services. The Secretary of State’s official ballot-measure page identifies Amendment 5 as HJR 173 & 174 and supplies the ballot title, fair ballot language, and linked amendment text; those materials describe what voters were asked to approve, not what became law after defeat. [1][2][3]

This is a status record, not tax, election, or public-finance advice. It was last verified on August 25, 2026, using the official ballot materials, the cited constitutional text, and reported litigation and fiscal records. There does not appear to be an official Missouri document titled “legal implications” for the Amendment 5 rejection; the conclusion here is a synthesis of the cited records.

What did not change on August 4

The clean sentence for a client update is this: Missouri voters rejected Amendment 5 on August 4, 2026, so the proposed constitutional changes never became operative. Reported results show roughly 83.3% voting no and 16.7% voting yes, on about 1.4 million ballots. [4] That margin may matter politically. It does not supply an extra legal rule.

The practical before-and-after is narrow:

• Individual income tax: the rejected amendment did not phase out or repeal the tax. The reported 4.7% top individual income-tax rate remains the baseline. [2]
• Hancock Amendment limits: Article X, Section 18(e), including voter approval for certain local tax, license, and fee increases, remains in force. [3]
• Sales and use tax on services: the constitutional restriction that Amendment 5 would have altered remains in place; the rejected proposal cannot be used as authority to tax a newly covered service.
• Local-government authority: no local tax authority expanded merely because Amendment 5 was placed on the ballot, litigated, campaigned over, or rejected.

That is the point at which a post-election memorandum should stop treating pre-election implementation scenarios as live law. The site’s pre-vote companion record, The Legal Impact of Missouri Amendment 5's Tax Phase-Out, remains useful for understanding what the measure would have authorized, but its projected changes are now moot unless and until a future measure is enacted.

The proposed tax changes remain proposals, not authorities

The official ballot materials are still the right starting point because they show the object of the vote. They are not a substitute for an enacted constitutional amendment. Amendment 5 was presented to voters through the Secretary of State’s ballot-title and fair-ballot-language process for HJR 173 & 174; after rejection, those documents have evidentiary value for what was submitted, but no operative force as tax law. [1]

Pre-election analyses described several possible consequences if the measure had passed, including authority connected to phasing out the individual income tax, changes to the sales and use tax treatment of goods and services not taxable as of January 1, 2015, a 97% local offset mandate, and options involving the Kansas City and St. Louis earnings taxes. [5] Those descriptions should now be recaptioned as defeated-proposal analysis. They do not answer whether a return may be filed differently, whether a city may impose a new tax, or whether an agency may collect tax on a service that remained outside the base before the election.

Fiscal figures help explain why the measure drew attention, but they should not be allowed to answer the legal question. Thomson Reuters, citing the Center on Budget and Policy Priorities, reported that the individual income tax provides about 62% of Missouri general revenue; ITEP used about 64%; Missouri Budget Project described the share as “six in ten.” [4][6][7] Those are not identical formulations, and there is no need to force them into one number for a legal status update. Each points to fiscal exposure. None changes the consequence of a failed constitutional amendment.

PAC v. Hoskins is now a ballot-language record, not an Amendment 5 implementation case

The litigation around Amendment 5 should be carried forward for the right reason. It shaped the language voters saw. It did not convert a defeated measure into law.

The reported procedural path was brief and consequential: Cole County Circuit Judge Christopher Limbaugh upheld the ballot language; the Western District Court of Appeals, in an opinion reported as authored by Judge Thomas Chapman on June 5, 2026, rewrote the language; and the Missouri Supreme Court declined on June 8, 2026, to disturb the appellate result before the August election. [8][9] The FindLaw docket listing identifies the case as PAC v. HOSKINS, WD 88981. [10]

For future ballot-title disputes, that record matters. Counsel should still verify the caption, opinion text, mandate, and any subsequent history against the Missouri courts’ own materials before citing the case for a settled holding beyond the reported procedural outcome. The docket listing is useful; it is not a substitute for the court file. [10]

The Governor’s office also issued a statement criticizing the appellate rewrite. [11] That statement belongs in the political and procedural history of the measure. It is not a source of tax authority, and it does not alter the effect of the voters’ rejection.

What remains live: Amendment 7 and the FY2028 General Revenue Fund projection

The next live constitutional question is not Amendment 5. It is Amendment 7, scheduled for the November 3, 2026 ballot on the Secretary of State’s ballot-measure page. [1] That measure, associated with SJR 95 and described in reporting as the Show-Me Prosperity Fund proposal, would create an endowment-style fund for future state revenues. Reported mechanics include limits on use of principal, a prohibition on spending or borrowing principal, and an annual appropriation cap of 3%. [12]

That is where forward monitoring belongs. Amendment 7 is pending; Amendment 5 is not. A November ballot proposal may require new client alerts, public-body planning, and fiscal memoranda. A defeated August proposal should not be treated as if it quietly amended a tax code provision.

The same is true of the State Auditor’s fiscal warning. Thomson Reuters reported that State Auditor Scott Fitzpatrick’s June 2026 report projected the General Revenue Fund could be exhausted early in FY2028. [4] That is a material fiscal condition for lawyers advising state agencies, appropriators, public institutions, and contractors with Missouri exposure. It is not proof that Amendment 7 will pass, and it is not a legal explanation for why Amendment 5 failed.

Post-election statements do not bar a future proposal

After the vote, opponents and commentators treated the margin as a warning against bringing back a similar tax plan. KFVS reported post-election reaction describing the defeat as overwhelming and reflecting arguments that the proposal should not return. [13] That may be a fair account of political pressure. It is not a constitutional prohibition.

Nothing in the rejection itself prevents a later General Assembly from proposing another constitutional amendment through the available legislative process. A future proposal would have to stand on its own text, ballot language, fiscal note, litigation record, and election result. The August 4 defeat supplies political history and campaign evidence, not a legal bar.

For present obligations, the distinction is straightforward: Amendment 5’s rejection creates no new tax obligation and removes none of the existing ones. The individual income tax remains in place, the Hancock Amendment remains in place, and the sales-tax expansion restriction remains in place. The matters to watch now are the November 3 Amendment 7 vote, the State Auditor’s FY2028 General Revenue Fund projection, and the verified court record of PAC v. Hoskins for future ballot-language disputes.

References

1. 2026 Ballot Measures, Missouri Secretary of State, https://www.sos.mo.gov/petitions/2026ballotmeasures
2. Explaining Amendment 5 ads, The Beacon, https://thebeaconnews.org/stories/2026/07/31/explaining-amendment-5-ads/
3. Article X, Section 18(e), Justia, https://law.justia.com/constitution/missouri/article-x/section-18-e/
4. Multistate Monitor: Missouri Rejects Income Tax Phase-Out, Bucking State Trend, Thomson Reuters, https://tax.thomsonreuters.com/news/multistate-monitor-missouri-rejects-income-tax-phase-out-bucking-state-trend/
5. Missouri Constitutional Amendment 5: Potential Tax Changes and Business Implications, Gordon Rees Scully Mansukhani, https://www.grsm.com/insight/missouri-constitutional-amendment-5-potential-tax-changes-and-business-implications/
6. Missouri Voters Reject Amendment 5 and a Damaging Tax Shift Onto Working Families, ITEP, https://itep.org/missouri-voters-reject-amendment-5-and-a-damaging-tax-shift-onto-working-families/
7. Voters Resoundingly Reject Amendment 5, Missouri Budget Project, https://mobudget.org/voters-resoundingly-reject-amendment-5/
8. Missouri Amendment 5 income tax sales use ballot language, KCUR, https://www.kcur.org/politics-elections-and-government/2026-06-06/missouri-amendment-5-income-tax-sales-use-ballot-language
9. Missouri Supreme Court rejects calls to change August ballot question on income taxes, KFVS12, https://www.kfvs12.com/2026/06/09/missouri-supreme-court-rejects-calls-change-august-ballot-question-income-taxes/
10. PAC v. HOSKINS, FindLaw, https://caselaw.findlaw.com/court/mo-court-of-appeals/110183.html
11. Appellate Court Rewrite Amendment 5 Language, Governor of Missouri, https://governor.mo.gov/official-statements/appellate-court-rewrite-amendment-5-language
12. Amendment 7 Would Create the Show-Me Prosperity Fund for Future State Revenues, Clarkston Nelson, https://cnmissouri.com/2026/08/10/amendment-7-would-create-the-show-me-prosperity-fund-for-future-state-revenues/
13. Missouri voters overwhelmingly reject Amendment 5 income tax swap, KFVS12, https://www.kfvs12.com/2026/08/05/missouri-voters-overwhelmingly-reject-amendment-5-income-tax-swap/