Understanding California State Income Tax
California imposes a progressive state income tax with nine brackets, making it one of the most complex and highest-taxed states in the country. Rates start at 1% for the lowest earners and climb to 13.3% for taxable income above $1 million. An additional Mental Health Services Tax of 1% applies to millionaires, effectively pushing the top marginal rate to 14.3%.
Unlike states with flat income taxes, California's graduated structure means your effective tax rate depends heavily on your total earnings. A worker earning $75,000 annually will face a marginal rate around 9.3%, while someone earning $50,000 falls into a lower bracket. This progressive design is intended to distribute the tax burden more heavily on higher earners.
SDI and Payroll Deductions
California State Disability Insurance (SDI) is a mandatory payroll deduction of 1.2% with no wage ceiling. Every dollar you earn is subject to SDI withholding, which funds short-term disability benefits and the Paid Family Leave program. This is separate from federal FICA taxes (Social Security at 6.2% up to the wage base, plus 1.45% Medicare).
California does not impose local or city income taxes, which simplifies payroll calculations compared to states like New York where NYC residents face an additional municipal tax. However, the combination of high state rates and SDI means California workers typically see a larger portion of their gross pay withheld than workers in most other states.
Deductions and Credits
California offers a standard deduction of $5,540 for single filers and $11,080 for married filing jointly. Taxpayers can also itemize deductions for mortgage interest, state and local property taxes, charitable contributions, and unreimbursed medical expenses. California conforms to many federal deduction rules but has notable differences, including not allowing deductions for state income tax paid.
Key credits available to California workers include the California Earned Income Tax Credit (CalEITC) for lower-income filers, the Young Child Tax Credit, and the renter's credit for qualifying renters. High earners should be aware that certain credits and deductions phase out at higher income levels, and the Alternative Minimum Tax may apply in some cases.