Missouri Amendment 5 Rejected: What It Means for Missouri Taxpayers

1. The bottom line for Missouri filers

2. What Amendment 5 would have done

Amendment 5 was a tax swap, not a simple tax cut. That distinction is the whole story of the result. The measure had two halves that were legally inseparable:

3. Why it failed by 83–16

4. What the result signals for other states

Several states have active pushes to eliminate their individual income tax. Missouri’s result does not stop that movement, but it does tell you which vehicle survives contact with voters:

• Trigger-based rate cuts keep working. The dominant model — already used by Missouri and by several neighbors — steps the top rate down only when general revenue clears a growth threshold. It is legislative, incremental, self-limiting when revenue softens, and it never asks voters to approve a replacement tax.
• Explicit swaps are the vulnerable form. The moment a proposal names what replaces the income tax, opponents can put a number on the other side of the trade. Amendment 5 is the strongest evidence to date that a swap loses badly when it is on the ballot in plain language.
• Constitutional entrenchment is a liability, not an asset. Advocates favor it for durability; voters read it as removing the ability to fix a mistake.

If you are weighing a move partly on state income tax, compare the actual burden rather than the headline rate with the state tax comparison calculator and the moving states tax guide.

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Frequently asked questions

Did Missouri Amendment 5 pass?

No. Missouri voters rejected Amendment 5 on August 4, 2026 by roughly 83% to 16% — a margin of more than five to one.

What would Amendment 5 have done?

It would have amended the Missouri Constitution to require the legislature to phase out the individual income tax: the general assembly "shall enact legislation to reduce and eliminate" the tax by cutting the top rate as state revenue grew until the tax reached zero, and it could then never impose a state individual income tax again. It would also have let lawmakers extend state and local sales and use taxes to goods and services that are untaxed today, but only if each expansion was offset in the same bill by an income-tax cut of at least substantially equal revenue, and it required local governments to cut their own rates without reducing school funding. The amendment set no end date; the pace depended on future legislation and revenue growth.

Do Missouri income tax rates change because of the vote?

No. Rejecting Amendment 5 preserves the status quo. Missouri's graduated individual income tax still runs from 0% on the lowest bracket up to a 4.7% top rate, and Missouri continues to conform to the federal standard deduction. Nothing about your 2026 withholding, estimated payments, or filing changes as a result of the election.

Could Missouri still eliminate its income tax later?

Legislatively, yes — the constitution does not require an income tax, and Missouri already has revenue-triggered rate reductions on the books that step the top rate down when general revenue growth targets are met. What the vote foreclosed is the fast route: locking a full phase-out plus a sales-tax expansion into the constitution in one ballot question.

What does the result mean for other states pushing income-tax elimination?

It is the clearest data point yet that voters distinguish between cutting an income tax and replacing it with a broader consumption tax. Rate-cut measures have generally polled and performed well; this one bundled a visible new tax on services with the cut and lost 83-16. Expect other states to keep pursuing trigger-based rate reductions through their legislatures rather than putting a tax swap directly on the ballot.