Missouri's retirement income tax story changed materially in 2024 — Social Security became fully exempt, the top rate began declining, and Missouri is now clearly a lower-income-tax state than Illinois, Minnesota, and most of the Midwest for typical retirees. But "Missouri is tax-friendly for retirees" obscures real variation depending on where your income comes from. If your income is primarily IRA withdrawals and private pension checks, Missouri taxes those fully. Here's the actual picture.
What Changed in 2024 — The Short Version
Missouri Senate Bill 190 (the same bill that created the property tax freeze) included a provision fully exempting Social Security benefits from Missouri state income tax starting tax year 2024. No income cap, no partial exemption, no phase-out — all Social Security income is now completely excluded from Missouri taxable income for all filers regardless of income level.
This was the last major piece of the Missouri retirement income exemption puzzle. Missouri had been partially exempting Social Security for years; the 2024 change completed it.
Simultaneously, Missouri's top income tax rate has been on a scheduled decline. It was 5.3% in 2022, 4.95% in 2023, 4.8% in 2024, and is scheduled to drop further as state revenue triggers are met — toward a target of 4.5%.
How Missouri Treats Each Income Source
Social Security
100% exempt from Missouri income tax as of tax year 2024. All filers, no income cap, no phase-out. This is the same treatment as Florida, Texas, and other "zero income tax" states — because Social Security was the dominant retirement income source that those comparisons kept citing.
Public Pensions (Missouri)
Missouri public employee pensions (MOSERS) are exempt up to the maximum Social Security benefit level — approximately $47,633 in 2025. Benefits above that threshold are taxable. Federal civil service pensions and military retirement receive similar treatment.
Railroad Retirement
Tier 1 Railroad Retirement benefits are treated as Social Security equivalents — fully exempt. Tier 2 benefits receive a partial exemption comparable to public pension treatment.
Private Pensions, 401(k), IRA Withdrawals
Private sector pension income is fully subject to Missouri income tax. Traditional IRA and 401(k) distributions are fully taxable. There is no separate exemption for these sources. At $80,000 in IRA withdrawals, you are paying Missouri income tax on the full amount at the applicable rate bracket — roughly 4.8% for amounts over the first-bracket threshold.
Missouri Income Tax Rate Schedule (2025)
| Missouri Taxable Income | Tax Rate | Tax on Top Dollar in Bracket |
|---|---|---|
| $0 – $1,121 | 1.5% | $16.82 |
| $1,121 – $2,242 | 2.0% | $22.42 |
| $2,242 – $3,363 | 2.5% | $28.03 |
| $3,363 – $4,484 | 3.0% | $33.63 |
| $4,484 – $5,605 | 3.5% | $39.24 |
| $5,605 – $6,726 | 4.0% | $44.84 |
| $6,726 – $7,847 | 4.5% | $50.45 |
| $7,847 – $8,968 | 4.8% | $53.81 |
| Over $8,968 | 4.8% | — |
The brackets above are for the Missouri taxable income amount after all exemptions. The top rate applies to all income above $8,968 in taxable income — which means the effective rate on large distributions is close to but slightly below 4.8% (because the lower brackets apply to the first ~$9K).
Three Scenarios — Real Tax Bills
| Income Profile | Income Source Breakdown | Missouri Taxable Amount | Estimated MO Tax Owed |
|---|---|---|---|
| Social Security + small pension | $28,000 SS + $18,000 public pension + $14,000 IRA = $60,000 total | $14,000 (IRA only; SS fully exempt; pension under $47,633 threshold) | ~$580/yr |
| Social Security + large pension | $28,000 SS + $52,000 public pension = $80,000 total | ~$4,367 (pension above the ~$47,633 exemption ceiling) | ~$190/yr |
| IRA-heavy retiree | $24,000 SS + $76,000 IRA withdrawals = $100,000 total | $76,000 (IRA fully taxable; SS fully exempt) | ~$3,500/yr |
| Primarily private pension | $24,000 SS + $60,000 private pension + $16,000 IRA = $100,000 total | $76,000 (private pension + IRA; SS exempt) | ~$3,500/yr |
Estimated state income tax only. Federal income tax not shown. Standard deduction applied. Exact figures depend on deductions, credits, and current-year bracket adjustments — consult a tax professional for personal projections.
Missouri vs Kansas — The Income Tax Comparison
| Missouri (2025) | Kansas (2025) |
|---|---|
| Social Security: Fully exempt | Social Security: Fully exempt (since 2024) |
| Public pensions: Exempt up to ~$47,633 | Federal/military/KPERS pensions: Fully exempt |
| Private pensions: Fully taxable | Private pensions: Fully taxable |
| 401(k)/IRA: Fully taxable | 401(k)/IRA: Fully taxable |
| Top rate: 4.8% (declining toward 4.5%) | Top rate: 5.58% |
The headline: for most retirees with mixed income sources including IRA or private pension income, Missouri is now the lower-income-tax state. Kansas exempts federal government and military pensions more completely than Missouri does, which creates an exception for that specific income type. But the rate difference (4.8% vs 5.58%) means that on taxable income above the exemption thresholds, Missouri costs meaningfully less per dollar than Kansas.
A retiree with $80,000 in IRA withdrawals (and $24,000 in Social Security) pays approximately $3,480 in Missouri state income tax and approximately $4,264 in Kansas state income tax — a $784/year difference, on top of the property tax comparison that already favors Missouri for buyers with the SB 190 freeze. The full property tax analysis is in our MO vs KS property tax comparison.
Want Help Modeling Your Specific Income Picture?
Our local agents can connect you with KC-area tax professionals who specialize in retirement income planning across the MO/KS state line — people who know both state tax codes and how the choice of county affects your total annual cost.
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