Taxes in St. Peters
St. Peters' tax picture combines a modest St. Charles County property-tax premium with Missouri's newly simplified, flat state income tax.
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Learn moreA modest property-tax premium
St. Charles County's median effective property tax rate ran 1.26% per Ownwell -- above both the 1.02% national median and Missouri's own 1.25% statewide median.
Missouri's real, flat 4.0% state income tax
Missouri's state income tax became a flat 4.0% as of January 1, 2026 (down from a graduated 4.7% top rate), with a statutory mechanism for further phase-down toward 3.7% if revenue triggers are met.
No local income tax in St. Peters
Unlike St. Louis city (which levies its own separate earnings tax), St. Peters carries no additional local income/earnings tax on top of the statewide rate.
Key takeaways
- St. Charles County's 1.26% effective property tax rate runs above national and Missouri statewide medians.
- Missouri's flat 4.0% state income tax (effective 2026) applies statewide, including in St. Peters.
- St. Peters carries no additional local earnings tax, unlike St. Louis city.
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