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Mortgage Calculator Missouri
Missouri only taxes about a fifth of your home's real value — and if you're a senior, whether your future bill gets frozen depends entirely on whether your specific county opted in. This calculator explains both before it gives you a number.
Estimate your Missouri mortgage payment
Updates liveIllustrative estimate only. Tax calculated on 19% of value for residential property — see below. Not a loan offer or financial advice.
Diagram: Missouri's constitution sets different assessment ratios by property type — residential homeowners get the second-lowest rate in the state.
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Understanding the Missouri mortgage market
What makes a Missouri mortgage different
A low residential assessment ratio keeps most Missouri bills modest — and a newer, patchwork senior freeze program adds a layer worth understanding before you assume it applies to you. This mortgage calculator Missouri buyers use walks through both.
The 19% residential assessment ratio
Missouri's constitution (Article X, Section 4) fixes assessment ratios by property classification, applying uniformly statewide. Residential real property is assessed at just 19% of its true market value — meaning if your home is worth $260,000, only about $49,400 of that is the taxable assessed value local rates actually apply to. This single rule does most of the work keeping Missouri's overall property tax burden moderate, with a median effective rate commonly cited around 0.88%.
SB 190, the senior freeze, explained properly
Senate Bill 190, signed in 2023, created a mechanism letting eligible senior homeowners lock their property tax at a base-year level, so future increases in assessed value or local rates don't raise what they actually owe. The original 2023 version tied eligibility to being Social Security-eligible, which excluded public employees like teachers, firefighters and railroad workers on separate pension systems — Senate Bill 756 in 2024 fixed this by replacing that requirement with a simple age-62-or-older threshold, broadening eligibility considerably.
| Property type | Assessment ratio | Notes |
|---|---|---|
| Residential real property | 19% | Constitutionally fixed statewide |
| Agricultural land | 12% | Based on agricultural use value |
| Commercial real property | 32% | Higher than residential |
| Personal property (vehicles, etc.) | 33.33% | Separate annual tax from real estate |
Why it's a county-by-county patchwork
Unlike a statewide mandate, SB 190 requires each individual county to pass its own authorizing ordinance before the freeze becomes available to local homeowners. As of 2026, roughly 85 of Missouri's 114 counties have adopted the program, but the remaining counties haven't, and even among adopting counties, implementation details — base-year selection specifics, application windows, documentation requirements — vary. This means the honest answer to "will my property tax be frozen when I turn 62" really depends on which specific Missouri county you live in, not a single statewide yes. This mortgage calculator Missouri won't assume otherwise for you.
How the base year is set
For a homeowner who's already eligible when a county's freeze takes effect, the base year is typically the tax amount paid the year before the ordinance's effective date. Going forward, the base year is generally the year prior to when the taxpayer becomes eligible and applies — so someone turning 62 in 2025 but not applying until 2026 would have a 2025 base year, not 2024. A lapse in participation or a change in homestead status can reset the base year, and it isn't applied retroactively to years before an application is filed.
The separate statewide Circuit Breaker credit
Independent of SB 190, Missouri's Property Tax Credit — commonly called the Circuit Breaker — is a refundable state income tax credit available statewide (not county opt-in) for lower-income seniors and disabled homeowners or renters, worth up to $1,100 for owners and $750 for renters, with eligibility based on income limits (commonly cited around $30,000 for the relevant threshold). This is a truly separate program from the county-based freeze, and eligible homeowners can potentially benefit from both simultaneously.
Missouri's separate vehicle tax
Missouri also assesses personal property — most commonly vehicles — at 33.33% of value, an entirely separate annual tax from real estate property tax. This bill arrives independently and isn't reflected in a standard mortgage payment estimate, but it's worth budgeting for as part of the real total cost of Missouri homeownership, especially for buyers relocating from a state without a comparable annual vehicle tax.
A worked example, start to finish. Say a buyer purchases a $260,000 home in Missouri with an effective tax rate of 0.88% (already reflecting the 19% assessment ratio applied to the local rate). With a 10% down payment, they're financing $234,000 at 6.6% over 30 years, giving a principal and interest payment of roughly $1,494.
Property tax adds about $191 a month, and with typical insurance, the full monthly payment comes to around $1,916. If this buyer is currently 58 and plans to stay long-term, it's worth checking now whether their specific county has adopted SB 190 — if it has, applying the year they turn 62 locks their base year and shields them from future increases; if it hasn't, no freeze mechanism will apply regardless of age, though the statewide Circuit Breaker credit may still be available if their income qualifies.
How to use this mortgage calculator Missouri tool
Enter the home price and down payment you're working with, along with your expected interest rate and loan term. The effective tax rate field defaults to a typical statewide figure of 0.88%, already reflecting the 19% assessment ratio — adjust it if you know your specific county's actual current rate. Add an estimated annual insurance premium, and this mortgage calculator Missouri shows your full estimated monthly payment.
Common mistakes to avoid
- Applying the local rate to full market value. Only 19% of a residential property's value is actually taxed.
- Assuming the senior freeze applies everywhere. It's truly county-by-county — confirm your specific county's adoption status.
- Confusing SB 190 with the statewide Circuit Breaker credit. They're separate programs with different eligibility and mechanics.
- Forgetting the annual personal property tax on vehicles. It's a real, separate cost not reflected in a mortgage payment estimate.
- Missing the application timing for the base year. Applying late can mean a less favorable base year than expected.
Quick glossary
- Assessment ratio
- The percentage of a property's market value actually taxed; 19% for Missouri residential real property.
- SB 190 senior freeze
- A county-opt-in program locking an eligible senior's property tax at a base-year level, preventing future increases from raising the amount owed.
- Base year
- The reference tax amount an SB 190 freeze is measured against, generally the year before a taxpayer becomes eligible and applies.
- Circuit Breaker (MO-PTC)
- Missouri's separate, statewide refundable income tax credit for lower-income seniors and disabled homeowners or renters.
- Personal property tax
- An annual Missouri tax on vehicles and other tangible property, assessed at 33.33% of value, separate from real estate tax.
The bottom line
Missouri's 19% residential assessment ratio keeps most bills fairly moderate from the start. If you're planning for retirement in Missouri, check whether your specific county has adopted the SB 190 senior freeze well before you turn 62 — it's not automatic statewide, and getting the timing right protects a more favorable base year. This mortgage calculator Missouri gives a realistic starting point for today's payment; local research is what tells you what happens after that.
Common questions