California Tax Returns: How to File, Deadlines, and Refund Status
Filing a California tax return means reporting your income, deductions and credits to the Franchise Tax Board (FTB), which is the state agency that administers California's personal income tax.
Whether you're a full-year resident, part-year resident or nonresident with California income, this guide covers who has to file, key deadlines, tax rates and how to get your refund as fast as possible.
California Tax Rates and Deductions
A California resident's filing status (single, married, etc), the number of their claimed dependents, age (under/over 65) and annual income are all used to determine the minimum income required to file a California tax return and how much the taxpayer will have to pay.
California has nine state income tax brackets, with rates ranging from 1% to 12.3% depending on your taxable income and filing status. Only the portion of income within each bracket is taxed at that rate. Taxpayers with income exceeding $1 million also pay a 1% Behavioral Health Services Tax surcharge, bringing the effective top marginal rate to 13.3%.
California's standard deduction is lower than the federal standard deduction. For the 2025 tax year, the standard deduction amounts are:
- Single or married/Registered Domestic Partner (RDP) filing separately: $5,706
- Married/RDP filing jointly, head of household or qualifying widow(er): $11,412
California does not conform to all federal itemized deductions. Taxpayers who itemize on their federal return should review what deductions California allows separately.
Who Needs to File a California Tax Return?
You're generally required to file a California state income tax return if you're a resident, part-year resident or nonresident and any of the following apply:
- You have income from a California employer or source
- Your gross income exceeds California's minimum filing threshold for your filing status and age
- You're required to file a federal income tax return
California also requires you to file if you owe taxes on specific items, including tax on a lump-sum distribution, alternative minimum tax or recapture taxes, even if your income would otherwise fall below the threshold.
How to File Your California State Tax Return
California residents can file their state income tax return online directly through CalFile or by mail. Filing electronically through an authorized e-file provider, such as E-file.com, is another good option, as it may help reduce errors and can result in faster processing and quicker refunds when direct deposit is selected.
Form 540 is the standard form used for individual income tax returns in California. Schedule X is what is required to file an amendment. You can check on the status of an amendment by calling 800-852-5711. Part-year residents and nonresidents use Form 540NR instead of Form 540.
If you're owed a CA tax refund, don't owe money or have already made your payment online, your tax return can be mailed to FTB at:
P.O. Box 942840
Sacramento, CA 94240-0040
If you owe CA taxes, the return and check/money order should be sent to FTB at:
P.O. Box 942867
Sacramento, CA 94267-0001
Estimated tax payments for the year are due quarterly and you can pay online at ftb.ca.gov or send payments to the FTB at the address above.
California Tax Return Deadline and Extensions
The deadline to file a California state income tax return is April 15, the same as the federal deadline. If April 15 falls on a weekend or holiday, the deadline moves to the next business day.
California grants an automatic six-month extension to file, moving the deadline to October 15. No form is required to request this extension. However, the extension applies to filing only, so any taxes owed must still be paid by April 15 to avoid penalties and interest.
How to Check Your California Tax Refund Status
You can check the status of your return or amendment by visiting the FTB website and navigating to the "Where's My Refund?" tool. To find the status of your CA tax refund, you'll need:
- Your social security number
- Your mailing address
- The refund amount shown on your tax form
Refunds are typically issued faster for e-filed returns with direct deposit. Paper returns and mailed refund checks take longer to process.
Failing to Pay Your California Taxes
If you fail to pay your California taxes, you'll owe a 5% monthly penalty on the amount due until you pay in full. If you underpay your taxes, you'll owe a penalty of up to 5% of the unpaid tax and an additional half of a percent of that amount every month until paid in full.
Penalties can be reduced or waived if you can demonstrate reasonable cause for the underpayment. Contact the FTB directly for abatement options.
Out of State Employment
Residents living in Northern California and working in Oregon may also be responsible for filing with that state. The same is true for residents of SoCal working in Arizona. However, this does not apply to residents working in Nevada, as this state does not currently collect income tax.
Frequently Asked Questions
Who must file a California Income Tax Return?
You must file a California income tax return if you are a resident, part-year resident or nonresident and you received income from a California source, earned income above California's minimum threshold for your filing status or are required to file a federal return.
When should a California taxpayer file an amended return?
An amended return is filed if there is an error in an overpayment or underpayment on a previously filed return. Other reasons for submitting the Form 540X include federal audit adjustments, disaster loss or an FTB audit contact.
How do I check the status of my California tax refund?
Use the FTB's "Where's My Refund?" tool at ftb.ca.gov. You'll need your Social Security number, mailing address, and the refund amount from your return.
What is the deadline for filing a California tax return?
The standard deadline is April 15. California grants an automatic six-month extension to October 15 for filing, but not for payment. Taxes owed must be paid by April 15 to avoid penalties.
Note: States & U.S. territories may make changes to their tax laws with little notice. We do our best to keep this information up-to-date, but it is provided on an "AS IS" basis. For more see our terms.