California collects state income tax on wages, investments, and other earnings

California has a state income tax that applies to residents and part-year residents who earn money within the state. Unlike some states that have no income tax at all, California taxes wages, self-employment income, interest, dividends, and capital gains. The tax rate varies depending on how much you earn — it ranges from 1% on the lowest incomes to 13.3% on the highest, making it one of the steepest income tax rates in the country.

If you work in California or live there for more than half the year, you almost certainly owe state income tax. Even if you live out of state but work remotely for a California employer, you may owe California tax on that income. The state's Franchise Tax Board (FTB) is the agency that collects and enforces these taxes.

Key Takeaways

  • California's state income tax ranges from 1% to 13.3% depending on your income level, with higher earners paying the top rate.
  • You owe California income tax if you are a resident, part-year resident, or nonresident who earned income in the state.
  • You file California taxes using Form 540 or Form 540-NR, depending on your residency status, by the same important date as federal taxes (usually April 15).
  • California taxes wages, self-employment income, rental income, investment gains, and retirement distributions, though some retirement income has special rules.
  • The Franchise Tax Board (FTB) administers California income tax and can audit returns, place liens, or garnish wages for unpaid taxes.

How California's tax brackets work

California uses a progressive tax system, meaning the rate increases as your income goes up. You do not pay the top rate on all your income — you pay the lower rate on the first portion, then a higher rate on the next bracket, and so on. The exact brackets change each year because they are adjusted for inflation.

For example, in the 2023 tax year, a single filer might pay 1% on the first roughly $10,000 of income, then 2% on income between $10,000 and $23,000, and so on, up to 13.3% on income over roughly $680,000. A married couple filing jointly has different bracket thresholds. The FTB publishes updated brackets each year on its website before tax season begins.

California also allows you to claim a standard deduction (a set amount you can subtract from your income before calculating tax) or to itemize deductions if you have large expenses like mortgage interest or charitable donations. Many people use the standard deduction because it is simpler and often results in a lower tax bill.

Who has to file a California tax return

You must file a California return if you are a resident or part-year resident and your income exceeds the filing threshold for your situation. The threshold depends on your age, filing status, and type of income. Generally, if you earned more than the standard deduction amount, you should file.

Nonresidents — people who do not live in California but earned income there — must also file if they had California-source income above the threshold. This includes people who worked in California for part of the year, freelancers who did work for California clients, or investors who received income from California property or businesses.

Even if your income is below the filing threshold, you may want to file anyway if you had taxes withheld from your paychecks or if you are due a refund. Filing allows you to recover that money.

What types of income California taxes

California taxes most forms of income. Wages and salaries are taxed at the rates described above. Self-employment income — money you earn from running your own business or freelancing — is also taxed, though you can deduct business expenses first. Investment income like interest from savings accounts, dividends from stocks, and capital gains (profit from selling an asset) are all taxable.

Retirement distributions have mixed treatment. Distributions from traditional IRAs and 401(k)s are taxable as ordinary income. However, Social Security benefits have special rules — a portion may be taxable depending on your total income, but many retirees pay no tax on Social Security at all. Pension income is generally taxable unless it qualifies for a specific exemption.

Rental income from property you own in California is taxable, though you can deduct expenses like mortgage interest, property tax, insurance, and repairs. Gambling winnings are taxable income. Unemployment benefits are taxable. Some types of income are not taxed — for instance, gifts, inheritances, and life insurance proceeds are generally not subject to California income tax.

How to file your California return

Most people file using Form 540 (California Resident Income Tax Return) or Form 540-NR (Nonresident or Part-Year Resident Income Tax Return). You choose based on your residency status during the tax year. The forms ask for your income from all sources, deductions, and credits, then calculate your tax liability.

You can file on paper by mailing the form to the FTB, or you can file electronically through the FTB's website or through tax software. Electronic filing is faster and reduces errors. The important date is usually April 15, the same as federal taxes, though you can request an extension to October 15 if you need more time.

If you owe money, you can pay when you file or set up a payment plan with the FTB. If you overpaid (because too much was withheld from your paychecks), the FTB will refund the difference, usually within a few weeks of processing your return.

Tax withholding and estimated payments

If you are an employee, your employer withholds California income tax from each paycheck based on the W-4 form you fill out. The amount withheld depends on how many dependents you claim and your filing status. If you think too much or too little is being withheld, you can adjust your W-4 at any time during the year.

If you are self-employed or have income that is not subject to withholding, you may need to make estimated tax payments four times a year (usually in April, June, September, and January). These payments cover the tax you expect to owe. If you do not make estimated payments and owe a large amount when you file, you may owe a penalty in addition to the tax itself.

Penalties and enforcement

If you do not file a required return or pay taxes owed, the FTB can take action. The agency can assess penalties for late filing or late payment, interest on unpaid taxes (which compounds daily), and can place a lien on your property or garnish your wages to recover the debt. The FTB also conducts audits — if the agency questions items on your return, you will be asked to provide documentation.

If you believe you made a mistake on a return you already filed, you can file an amended return using Form 540-X. You have generally four years from the original filing important date to amend a return and claim a refund.

Frequently Asked Questions

Do I have to pay California income tax if I moved out of state?

No, once you establish residency in another state, you no longer owe California income tax on income earned after you move. However, you may owe tax on income earned while you were still a California resident. The FTB looks at factors like where you spent most of the year, where your family lives, and where you own property to determine residency status.

What is the difference between Form 540 and Form 540-NR?

Form 540 is for California residents and part-year residents. Form 540-NR is for nonresidents who earned California-source income but did not live in the state. Nonresidents only report income earned in California, not income from other states. Using the wrong form can delay your refund or trigger an audit.

Can I deduct federal income tax from my California taxes?

No, California does not allow you to deduct federal income tax paid. However, you can deduct state and local taxes (SALT) on your federal return, up to $10,000 per year. California state income tax is one of the taxes that counts toward that limit.

What happens if I do not file a California return when I should have?

The FTB can assess penalties for failure to file and failure to pay. If you owed taxes, interest accrues on the unpaid amount. If you are owed a refund, you have four years to file and claim it; after that, the money goes to the state. Filing late is better than not filing at all.

Are military members stationed in California required to pay state income tax?

Active-duty military members are generally exempt from California income tax on military pay, even if stationed there. However, they still owe tax on non-military income like a spouse's wages or investment income. The rules are complex, so military families should consult the FTB or a tax professional for their specific situation.