Retiring in O'Fallon

Retiring in O'Fallon offers a genuinely safe, consistently ranked city and ready regional healthcare access, balanced against St. Charles County's above-average property tax rate.

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Missouri's retirement-friendly income-tax framework

Missouri's real, flat 4.0% state income tax applies, and Missouri exempts a real, growing share of Social Security income from state tax for qualifying retirees -- confirm current, specific rules directly with a tax professional.

A real, repeated safety ranking

O'Fallon's SafeWise 'Safest Cities in Missouri' ranking, held every year since 2022, offers retirees real, genuine peace of mind relative to several other Missouri cities.

Weigh the above-average property tax rate honestly

St. Charles County's 1.26% median effective property tax rate runs above Missouri's statewide average -- retirees on a fixed income should weigh this honestly against the county's real safety advantages.

Key takeaways

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Read the full O'Fallon overview for the complete picture -- housing, taxes, climate, and who this place genuinely fits.

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Last reviewed: 2026-08-27. Independent research; not financial, tax, or legal advice -- confirm current figures with a local professional before making a decision.