Missouri Reassessment: What the Bill Becomes After Buying

In Missouri, buying a home does not change its property tax bill by itself. The next scheduled reassessment does, and in most of the state's bigger counties it lands within a year or two of a purchase. The useful question is not "what will my tax be after the sale" but "how far is this home's assessment from the price I am paying, and when is the next reassessment".

General information about how Missouri residential assessment works, not tax or legal advice. Confirm a specific parcel's figures with the county assessor.

How the bill is built

• Residential property is assessed at 19% of its market value (RSMo 137.115). A home the assessor values at $300,000 is assessed at $57,000.
• The tax bill is the assessed value times the combined rate of every taxing district on the parcel (county, school district, city, fire, library and others). Rates are set per $100 of assessed value.
• Counties reassess on an odd-year cycle: 2025, 2027, 2029 and so on. A sale does not trigger a reassessment, and nothing resets at closing. The year-to-year bill follows the assessment until the next cycle.

So the bill you inherit is the seller's bill, on the last reassessment. If that reassessment came before prices rose, or the seller got relief, the bill after the next cycle can be quite different.

Does the assessment catch up to the price?

We checked how far a parcel's next assessment sits from its own recent sale price in this analysis: parcels with a recorded 2024 sale and a 2025 assessment, grouped by county (more than 12,000 parcels in all). The ratio of the 2025 assessed value, grossed up by 19%, to the 2024 sale price:

In St. Louis County the 2025 assessments sit almost at 2024 sale prices, so a buyer there should expect the next bill to be close to the price times 19% times the local rate. In Jackson County 2025 increases were capped under 15% by order, which is why assessments sit well below sale prices. These ratios come from our own records and are averages: a particular home can sit well above or below its county's figure.

An estimate you can do yourself

1. Take the price and the county's ratio above: $400,000 × 0.77 (St. Louis City) = $308,000 of expected market value in the assessor's eyes.
2. Multiply by 19%: $58,520 assessed.
3. Multiply by the parcel's own effective rate. The current bill divided by the current assessed value gives it; it already includes whichever taxing districts apply.

The analyzer runs this for an address and shows a low, central and high scenario for the next reassessment year.

Two things that can distort the bill

• A bill held flat. In some counties about one parcel in five has a current bill equal to last year's even though its assessment rose. That is most likely a senior property-tax freeze (unconfirmed), which belongs to the current owner and ends at sale.
• Old assessments. In a county whose last reassessment is more than one cycle behind, the figure on a listing can be several years old.

Where to look

Missouri has no published statewide table of combined rates, so the rate for a parcel comes from its tax district. City pages show the range inside the city: Kansas City, St. Louis, Springfield and others on the Missouri city index. The Missouri reassessment calculator applies the steps above.

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Sources: RSMo 137.115 (19% assessment ratio and odd-year cycle); the State Tax Commission's 2025 order capping residential increases; our own comparison of 2024 recorded sales with 2025 assessments (St. Louis City, St. Louis County, St. Charles, Clay, Jackson, Platte, Greene and other Missouri counties).