St. Louis County property tax calculator 2026
This St. Louis County property tax calculator provides an estimated property tax for residential property based on market value, the 19% statutory assessment ratio under Missouri law, and a combined local property tax levy. The result is an estimate and actual tax bills may differ depending on the applicable taxing districts and exemptions.
Estimates only. Loan terms and approval depend on lender underwriting.
Many U.S. counties use multiple local taxing authorities (county, city, school district, special districts). Enter your combined local millage rate as shown on your annual property tax notice.
Estimated property tax
Enter the market value to see the estimated annual property tax.
How it works
In Missouri, the assessor determines the true value in money, commonly referred to as market value. Residential real property is assessed at 19% of its true value in money under state law. This estimator multiplies the market value by 0.19 to determine assessed value. The assessed value is then multiplied by the combined local property tax levy, which reflects the total of overlapping taxing jurisdictions such as the county, municipality, school district, and other special districts.
Examples
The calculation follows a fixed structure for residential property: market value multiplied by 0.19 to determine assessed value, and then multiplied by the combined local levy entered by the user. Because property tax levies vary by school district and other local jurisdictions within St. Louis County, the combined rate must reflect the correct location of the property.
Limitations and important notes
This calculator estimates property tax for residential real property only. Agricultural, commercial, industrial, and personal property are subject to different statutory assessment percentages under Missouri law. Combined local levies vary depending on the overlapping taxing districts for each parcel. Exemptions are applied on a property-specific basis and are not automatically included in this estimate. The official tax bill may differ from this result.
FAQs
How is residential property tax calculated in St. Louis County?
Residential property tax is calculated as market value multiplied by the 19% statutory assessment ratio and then multiplied by the combined local property tax levy applicable to the property’s taxing districts.
Does Missouri use the same assessment percentage for all property?
No. Missouri law sets different assessment percentages depending on property classification. Residential property is assessed at 19% of true value in money.
Is there one countywide property tax rate?
No. The total property tax levy depends on the combination of county, municipal, school district, and special district levies that apply to a specific property location.
Does this calculator show my official tax bill?
No. This tool provides an estimated property tax based on market value and a combined local levy. The official tax bill issued by the county collector may include adjustments or exemptions not reflected here.
Related Property tax calculators
Calculations are simplified and for guidance only. Always double-check results and current rules with official sources or a qualified professional before making financial decisions.