Estimate California state income tax for the 2025 tax year using the published rate schedules, standard deductions, SDI, Mental Health Services Tax, dependent credits, and take-home pay.
California uses a progressive state income tax system with published rate schedules that vary by filing status. For the 2025 tax year, ordinary rates run from 1% to 12.3%, and taxable income above $1 million also faces the additional 1% Mental Health Services Tax. California also withholds State Disability Insurance (SDI) from wages, which is separate from income tax.
This calculator estimates California tax using the 2025 single, married filing jointly, and head-of-household schedules, the current standard deduction defaults, the dependent exemption credit, and employee SDI at 1.2%. It is designed for planning and withholding checks, not as a substitute for a filed return.
The result is still an estimate. It does not model every California return feature, such as itemized deduction limits, personal exemption credits, renter or senior credits, AMT, special income adjustments, or all credit interactions.
California's filing-status schedules, small standard deductions, dependent credits, Mental Health Services Tax, and separate SDI withholding make back-of-the-envelope estimates easy to misread. This calculator breaks the result into clear components so you can estimate tax and take-home pay with fewer hidden assumptions.
California state income tax = Sum of (taxable income in each bracket × bracket rate) + Mental Health Services Tax − dependent exemption credits 2025 ordinary rates: 1%, 2%, 4%, 6%, 8%, 9.3%, 10.3%, 11.3%, 12.3% Mental Health Services Tax = 1% on California taxable income over $1,000,000 Employee SDI = 1.2% of SDI-subject wages Dependent exemption credit = $475 per dependent (2025)
Result: $6,512 total California tax
With $100,000 of gross income and the 2025 single standard deduction of $5,706, taxable income is $94,294. The 2025 California rate schedule produces about $5,312 of state income tax, and SDI adds $1,200, for roughly $6,512 of total California tax.
Use the correct filing status before reading the bracket table, and remember that SDI is computed separately from California income tax. The dependent exemption credit and the Mental Health Services Tax both change the final total, so check those inputs separately if the result looks off.
The most common errors are using federal deduction amounts instead of California's smaller state standard deduction, overlooking SDI withholding, or assuming the top 13.3% rate applies to all income. Recheck the bracket thresholds, deduction amount, and dependent credit before treating the estimate as final.
Last updated:
This calculator estimates California state tax by subtracting the entered deduction amount from gross income, applying the 2025 California rate schedule for the selected filing status, adding the 1% Mental Health Services Tax on California taxable income above $1 million, subtracting the entered dependent exemption credits, and then calculating employee SDI separately at 1.2% of SDI-subject wages.
It is a planning estimate rather than a completed California return. The page does not attempt to model every California return adjustment or credit, including personal exemption credits, itemized-deduction limits, renter or senior credits, AMT, or special-source income rules, so use the result for quick planning rather than filing.
The highest effective California marginal rate is 13.3% on taxable income above $1 million. That consists of the 12.3% top ordinary rate plus the additional 1% Mental Health Services Tax.
Yes. For the 2025 tax year, California uses a standard deduction of $5,706 for single filers and married filing separately, and $11,412 for married filing jointly, surviving spouse, and head of household.
For 2025, employee State Disability Insurance is 1.2% of SDI-subject wages, and California no longer applies a taxable wage cap. SDI is separate from California income tax.
No. California taxes capital gains as ordinary income with no preferential state capital-gains rate, so they flow into the same California brackets as wages and other taxable income.
California has the highest top state income-tax rate in the country. Because California deductions and credits differ from the federal return, state taxable income often differs from federal taxable income even before federal tax is considered.
California taxes most retirement distributions, including traditional IRA and 401(k) withdrawals, at ordinary state income-tax rates. Social Security benefits are not taxed by California.