Taxes in O'Fallon
O'Fallon's tax picture combines St. Charles County's above-average effective property tax rate with Missouri's real, flat 4.0% state income tax.
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Learn moreSt. Charles County's above-average property tax rate
St. Charles County's median effective property tax rate ran 1.26% per Ownwell (with a separately-cited 1.2% figure elsewhere) -- above both Missouri's statewide 0.88%-0.97% range and the national 1.02% median. A city-specific O'Fallon figure was not confirmed this pass.
Missouri's flat 4.0% state income tax
Missouri's real, flat 4.0% state income tax (effective January 1, 2026, down from a graduated top rate of 4.7%) applies statewide, including in O'Fallon, with a real but conditional statutory phase-down mechanism toward 3.7% over roughly a decade.
Missouri's sales tax layers
Missouri's comparatively low 4.225% state sales tax rate sits under real, substantial local St. Charles County and O'Fallon-specific add-ons -- confirm current, address-specific combined rates directly.
Key takeaways
- St. Charles County's 1.26% effective property tax rate runs above both Missouri's statewide range and the national median.
- Missouri's flat 4.0% state income tax applies statewide, including in O'Fallon.
- Missouri's state sales tax sits under real, substantial local St. Charles County and O'Fallon-specific add-ons.
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