Missouri Property Tax 2026: 19% Residential Assessment, Biennial Reassessment & the Senior Freeze

How Missouri Property Tax Works in 2026

Missouri levies no state-level property tax — counties and the independent City of St. Louis administer and collect locally, with the State Tax Commission providing oversight, equalization, and appeals review. The statewide average effective rate is approximately 0.89% of home value according to the Tax Foundation, just below the U.S. average of about 1.0%.

Missouri's system centers on a constitutionally-set, classification-based assessment ratio: residential real property is assessed at 19% of its true value in money, agricultural and horticultural property at 12% of its productive/market value, and all other property (commercial, industrial, etc.) at 32%. Unlike states that reassess every 4–6 years, Missouri counties must conduct a general reassessment every two years, in each odd-numbered year, keeping values closer to current market conditions. This guide covers the 19% residential assessment ratio, the biennial reassessment cycle, the state Property Tax Credit circuit breaker, the newer Senior Property Tax Freeze Credit under SB 190, county rate variation, and a worked example for a $300,000 home.

The 19% Residential Assessment Ratio: How Your Bill Is Calculated

Missouri's Constitution sets distinct assessment ratios by property classification, with residential real property assessed at 19% of its true value in money (the state's term for market value). Agricultural and horticultural land is assessed at a much lower 12% of its productive or market value, reflecting the state's policy preference for keeping working farmland affordable to hold, while all other real property — commercial, industrial, utility, and most business property — is assessed at a considerably higher 32%.

Example: Converting True Value to Assessed Value

A home with a true value in money of $350,000: $350,000 × 19% = $66,500 assessed (taxable) value. Local tax rates — expressed per $100 of assessed value — are then applied to this $66,500 figure.

Why Commercial Property Pays So Much More Proportionally

Because commercial property is assessed at nearly 1.7 times the residential ratio (32% vs. 19%), an identically-valued commercial building generates significantly more property tax revenue per dollar of value than a home does — a deliberate policy choice found in several Midwest states (Illinois has a similar, though even larger, residential/commercial gap in Cook County) intended to shift more of the local funding burden onto business property.

How Often Does Missouri Reassess Property Values?

Unlike many states that reassess only every 4–6 years, Missouri law requires county assessors to conduct a general reassessment of all real property every two years, in each odd-numbered year (2025, 2027, 2029, etc.), with the goal of keeping assessed values closer to current market conditions than a longer cycle would allow. The Missouri State Tax Commission oversees this process statewide, publishing ratio studies and providing guidance to ensure assessors across the state's 114 counties (plus the independent City of St. Louis) apply consistent standards.

The Hancock Amendment: A Revenue-Neutral Safeguard

Missouri's 1980 Hancock Amendment requires that when reassessment causes a jurisdiction's total assessed valuation to rise, the local tax rate must generally be rolled back so that the jurisdiction doesn't collect substantially more total revenue than the prior year without a public vote — conceptually similar to Tennessee's certified tax rate or Kansas's truth-in-taxation requirement. This means a reassessment alone doesn't automatically translate into a proportionally larger tax bill, though rising individual property values relative to the jurisdiction's overall average can still shift the burden between properties even when total revenue stays flat.

Missouri's Two Senior Relief Programs: Circuit Breaker and Tax Freeze

Missouri does not offer a general ad valorem homestead exemption, but it provides two distinct — and stackable — relief mechanisms specifically for seniors and homeowners with disabilities.

Property Tax Credit ("Circuit Breaker")

Administered by the Missouri Department of Revenue, this refundable credit reimburses part of the property tax (or rent, for renters) paid by qualifying homeowners 65+ or disabled. The maximum credit is currently $1,100 for homeowners (and $750 for renters), with an income limit around $34,000 for both single and married applicants. Recent legislation increases the maximum credit to $1,500 starting with the 2026 tax year, expands eligible income thresholds, and removes the income cap entirely for 100%-disabled veterans.

Senior Property Tax Freeze Credit (SB 190)

Signed into law in 2023, SB 190 created a fundamentally different mechanism: rather than a refundable credit, it lets participating counties freeze the actual dollar amount of property tax owed on an eligible senior's homestead at the level in effect when they first qualify — even as assessed values and local rates rise in subsequent years. Crucially, this is a county opt-in program: a county must adopt it by ordinance or voter petition before its seniors can benefit. As of 2026, roughly 85 of Missouri's 114 counties have adopted the freeze, including most of the state's largest counties (St. Louis, Jackson, Clay, Greene), though local eligibility rules and application deadlines vary by county — always confirm with your specific county assessor or collector whether the freeze is available and what the local terms are.

County Property Tax Rates Compared

Because Missouri's 114 counties, the independent City of St. Louis, and overlapping school districts and special districts each set levies independently (subject to Hancock Amendment rollback rules), effective rates vary across the state even under the uniform 19% residential assessment ratio. The figures below are approximate effective rates compiled from secondary property-data aggregators rather than a single official statewide per-county ranking.

Approximate Effective Property Tax Rates — Major Missouri Counties (2026)

Why Jackson and St. Louis Counties Run Above the Statewide Average

Both of Missouri's most populous counties sit well above the ~0.89% statewide average, which is pulled down by the state's many smaller, more rural counties with lower nominal rates and fewer overlapping school, library, fire, and special-district levies than the higher-service Kansas City and St. Louis metro areas.

Worked Example: $300,000 Home in Boone County (Columbia)

This example walks through Missouri's assessment chain for a home near Columbia's 2026 typical value range.

Step 1: Apply the 19% Residential Assessment Ratio

$300,000 true value in money × 19% = $57,000 assessed (taxable) value.

Step 2: Apply an Approximate Effective Rate Cross-Check

Using Boone County's approximate effective rate of ~1.05% applied directly to the $300,000 market value as a quick cross-check:

$300,000 × 1.05% ≈ $3,150 per year

Step 3: Compare to Jackson and St. Louis Counties

The same $300,000 home would owe roughly $3,810/year in Jackson County (Kansas City) at its ~1.27% effective rate, versus roughly $3,600/year in St. Louis County at its ~1.20% effective rate — both several hundred dollars above the Boone County estimate.

Step 4: Apply Senior Relief, If Eligible

A qualifying senior homeowner with income under the Property Tax Credit threshold (~$34,000) could receive up to $1,100–$1,500 back as a refundable credit against this bill. A senior in a county that has adopted the SB 190 freeze would instead have their dollar-amount bill locked at whatever level applied when they first qualified, protecting them from future increases regardless of rising assessed values.