Taxes in Riverside
California's real Prop 13 property-tax mechanic and its genuinely highest-in-the-US 13.3% top marginal income tax rate both apply to Riverside residents, with a real, important nuance in how Riverside County's low reported effective rate should be read.
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Learn moreProp 13, and the real reason Riverside County's county-wide rate looks low
Riverside County's widely-cited 'effective' property tax rate (0.82%) runs below both the 1% Prop 13 base and the California statewide average -- but this is a real, disclosed blending artifact: it averages decades of Prop-13-suppressed assessed values across long-time owners countywide. A fresh 2026 buyer's assessed value resets to the purchase price and should expect an effective rate closer to 1.05%-1.25% (the 1% base plus local bonds/assessments), not the lower county-wide figure.
California's real progressive income tax, not a flat rate
California runs ten income tax brackets, topping out at a real 13.3% marginal rate (including the 1% Mental Health Services Act surcharge) on income over $1M -- the highest top marginal state income tax rate in the US, applying identically to Riverside residents as any other California resident.
Retirement-income treatment
California does not tax Social Security benefits at the state level, but fully taxes pension and retirement-account withdrawals at ordinary rates with no retirement-income deduction.
Key takeaways
- Riverside County's low 0.82% county-wide rate reflects a Prop 13 blending artifact -- new buyers should expect ~1.05%-1.25%.
- California's real progressive income tax reaches a 13.3% top marginal rate (over $1M) -- the highest in the US.
- Social Security is exempt from state tax; pensions and retirement-account withdrawals are fully taxed.
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