California income tax goes up to 13.3% at the top bracket. Calculate your combined federal + state effective tax rate for 2026. Formula shown, sources cited — no account required.
California's income tax structure is the most steeply graduated in the United States. Rates climb from 1% at the lowest bracket to 13.3% at the top, with additional Mental Health Services Tax at 1% on income over $1 million. For a median earner at $100,149, the applicable state brackets produce an effective state rate typically in the 6–8% range after the standard exemption. California also levies the SDI payroll tax, currently at 1.1% with no wage cap, which adds to the effective burden. Federal income tax layered on top means the median California earner faces a combined marginal rate frequently above 35%. One important California-specific deduction is the mortgage interest deduction, which remains fully available at the state level and matters greatly given the size of typical California mortgages. Use the tax bracket calculator to map your combined federal and California state rates and understand your true marginal cost of additional income.
California's High State Taxes: Federal + State Brackets Explained (2026)
California has a state income tax with a top marginal rate of 13.3%. On top of federal rates (10%–37%), residents can face a combined marginal rate exceeding 40% at higher income levels. However, your effective rate is always lower than the marginal rate because only income above each threshold is taxed at that bracket's rate.
The median household in California earns $100,149/year. At that income (single filer), the federal effective rate is approximately 12–14%, bringing total income tax (federal + state) to roughly 20–23%.
How Marginal vs. Effective Rate Works
The marginal rate is the rate on your last dollar of income — it does not apply to all income. The effective rate is your total tax divided by total income. For example, someone earning $100,000 in California has a 22% federal marginal rate but an effective federal rate of roughly 15%, because the first $44,725 (2024) is taxed at 10% and 12%, not 22%.