California State Taxes: A Complete Guide for Individuals and Small Business Owners

Did you know California has the highest top marginal income tax rate of any U.S. state? At 13.3% on income over $1 million, California's tax system is one of the most complex and progressive in the country. Whether you're a freelancer, LLC owner, or running a multi-member partnership, understanding California's tax rules can save you thousands of dollars—and help you avoid costly penalties.

This guide covers everything you need to know about California state taxes in 2026.

California Personal Income Tax: Brackets and Rates

California uses a nine-bracket progressive income tax system administered by the Franchise Tax Board (FTB). For the 2025 tax year (filed in 2026), single filers pay:

Taxable Income	Tax Rate
$0 – $10,412	1%
$10,413 – $24,684	2%
$24,685 – $38,959	4%
$38,960 – $54,081	6%
$54,082 – $68,350	8%
$68,351 – $349,137	9.3%
$349,138 – $418,961	10.3%
$418,962 – $698,271	11.3%
$698,272+	12.3%

Married filing jointly taxpayers generally have thresholds approximately double the single-filer amounts.

The Mental Health Services Tax Surcharge

California levies an additional 1% Mental Health Services Tax on taxable income over $1 million. This pushes the effective top rate to 13.3%, making California the highest-taxed state in the nation for high earners.

Standard Deductions

California's standard deductions are modest compared to the federal standard deduction:

• Single filers: $5,363
• Married filing jointly: $10,726

Because these amounts are low, many Californians benefit from itemizing deductions instead—particularly homeowners with large mortgage interest and property tax payments.

Who Must File a California Tax Return?

You must file a California state income tax return if your gross income exceeds the following thresholds (for 2025):

• Single, under 65: $21,574
• Single, 65 or older: $28,774
• Married filing jointly, both under 65: $43,148
• Head of household, under 65: $34,503

Even if you don't owe any taxes, filing may be required or beneficial—particularly if you're entitled to refundable credits.

Nonresidents and Part-Year Residents

California taxes nonresidents on income derived from California sources—including wages earned in the state, rental income from California property, and business income attributable to California operations. Part-year residents are taxed on California-source income for the entire year plus all income earned while they were a resident.

California Business Taxes by Entity Type

The tax treatment of your business depends heavily on how it's structured.

Sole Proprietors

Sole proprietors report business income on their personal California return (Schedule C). No separate state business tax applies, but you'll pay California self-employment taxes alongside federal self-employment tax.

General Partnerships

Partnerships file an informational return with the FTB but pay no state income tax at the entity level. Each partner reports their share of income on their individual California return. General partnerships are not subject to the $800 franchise tax.

Limited Liability Companies (LLCs)

California's LLC tax rules are among the most complex in the country:

• $800 annual minimum franchise tax: Every LLC doing business in California—regardless of income or whether it conducted any business—owes at least $800 per year
• Annual LLC fee based on gross receipts:

California Gross Receipts	Annual Fee
Under $250,000	$0
$250,000 – $499,999	$900
$500,000 – $999,999	$2,500
$1,000,000 – $4,999,999	$6,000
$5,000,000+	$11,790

LLCs taxed as disregarded entities (single-member) file Form 568. Multi-member LLCs taxed as partnerships also file Form 568. LLCs that elect S corporation treatment file Form 100S.

New LLCs: First-year LLCs are exempt from the $800 minimum franchise tax for their first taxable year—but the annual fee on gross receipts still applies.

S Corporations

S corporations pay a 1.5% franchise tax on net income, with a minimum of $800. This is in addition to shareholders paying California personal income tax on their pass-through income.

C Corporations

C corporations pay an 8.84% corporate tax rate on net income. If a corporation has no net income, an Alternative Minimum Tax (AMT) of 6.65% applies, plus the $800 minimum franchise tax.

California Sales and Use Tax

California's statewide base sales tax rate is 7.25%, but local district taxes bring the rate higher in many areas. Total rates in cities like Los Angeles, San Francisco, and San Jose often reach 10.25% or more.

Businesses making taxable sales must register with the California Department of Tax and Fee Administration (CDTFA), collect sales tax from customers, and file regular sales tax returns.

Note: Use tax applies when you purchase taxable items without paying sales tax (such as from out-of-state vendors) and use them in California.

California Payroll Taxes

If you have employees, California requires you to withhold and remit several payroll taxes:

• State Income Tax (PIT) withholding: Withheld from employee wages based on Form DE 4 elections
• State Disability Insurance (SDI): Employees pay 1.2% of wages up to the annual wage ceiling (approximately $145,600 in 2025)
• Employment Training Tax (ETT): Employers pay 0.1% on the first $7,000 of each employee's wages
• Unemployment Insurance (UI): Employers pay between 1.5% and 6.2% on the first $7,000 of each employee's wages, depending on experience rating

Payroll taxes are administered by the California Employment Development Department (EDD).

Key Tax Deadlines for California

Mark these dates on your calendar:

Individual Returns

• April 15, 2026: California personal income tax return due (same as federal)
• October 15, 2026: Extended filing deadline (if extension filed)

Business Returns

• March 15, 2026: S corporation and partnership returns due
• April 15, 2026: Single-member LLC (disregarded entity) returns due
• April 15, 2026: C corporation returns due (calendar year)

Estimated Tax Payments

California follows a non-standard estimated tax payment schedule. If you expect to owe $500 or more in California taxes ($250 for married filing jointly), you must make quarterly payments:

Payment	Due Date	Percentage of Annual Liability
Q1	April 15	30%
Q2	June 17	40%
Q3	September 15	0%
Q4	January 15	30%

The unusual 0% third payment is a California quirk—be careful not to apply the federal equal-installment rule to your California payments.

Common California Tax Deductions and Credits

For Individuals

• Mortgage interest deduction: Deductible on California Schedule CA
• Charitable contributions: Deductible if you itemize
• Medical expenses: Deductible to the extent they exceed 7.5% of AGI
• California Young Child Tax Credit: $1,117 credit per child under age 6 (refundable)
• Earned Income Tax Credit (CalEITC): California's own EITC, which supplements the federal credit for lower-income earners

For Businesses

Common deductible business expenses in California include:

• Advertising and marketing
• Business insurance premiums
• Home office expenses (if exclusively and regularly used for business)
• Professional services (legal, accounting, consulting)
• Equipment and technology (including Section 179 expensing)
• Business vehicle expenses
• Employee salaries and benefits

Important: California does not always conform to federal tax law. In several areas—including bonus depreciation rules and certain business credits—California has its own rules that differ from federal treatment. Always check FTB guidance or consult a tax professional when claiming deductions that rely on federal conformity.

How to File Your California Taxes

CalFile

The FTB offers CalFile, a free, direct-to-state e-filing system for eligible taxpayers. You'll need a MyFTB account to use it. Eligibility requirements apply based on income level and return complexity.

FTB Web Pay

For estimated taxes and balance-due payments, FTB Web Pay allows you to pay directly from your bank account at no charge.

Paper Filing

Paper returns can be mailed to the FTB, but e-filing is faster and provides instant confirmation.

California vs. Federal Tax: Key Differences to Know

California doesn't fully conform to federal tax law, which creates traps for the unwary:

1. Bonus depreciation: California does not allow 100% bonus depreciation—you may need to add back differences on your California return
2. Section 179 expensing: California limits are lower than federal limits
3. Pass-through entity (PTE) tax: California offers an elective PTE tax that allows S corporations and partnerships to deduct state taxes at the entity level, partially circumventing the federal SALT deduction cap
4. Net operating losses (NOLs): California suspended NOL deductions for certain taxpayers in prior years; check current FTB guidance for your situation
5. Cannabis businesses: California does allow deductions for cannabis business expenses, unlike federal law under IRC §280E

Penalties for Late Filing and Payment

California takes compliance seriously. Key penalties include:

• Late filing: 5% of unpaid tax per month, up to 25%
• Late payment: 0.5% of unpaid tax per month
• Underpayment of estimated tax: Interest and penalties calculated by the FTB
• LLC failure to file Form 568: $18 per member per month, up to 12 months

If you can't pay what you owe, file your return on time anyway. Late filing penalties are typically steeper than late payment penalties.

Planning Tips for California Taxpayers

1. Consider the Pass-Through Entity Tax Election If you own an S corporation or partnership, the PTE tax election can allow you to deduct California taxes at the entity level and recoup a credit on your individual return. This effectively works around the $10,000 federal SALT cap for business owners.

2. Contribute to a California-Approved Retirement Account Contributions to 401(k), SEP-IRA, and similar plans reduce California taxable income dollar-for-dollar (within federal limits).

3. Timing Income and Deductions Given California's high top rates, accelerating deductions into high-income years and deferring income into lower-income years can produce meaningful savings.

4. Track All Business Expenses Carefully California's high tax rates mean every legitimate deduction is worth more here than in most other states. A $10,000 deduction saves a top-bracket taxpayer roughly $1,330 in California taxes alone—on top of the federal savings.

5. Monitor Residency Status California aggressively pursues tax on income earned by former residents and high earners who split time between states. If you're relocating, get documentation of your domicile change right and understand the "safe harbor" rules.

Keep Your Finances Organized for Tax Season

California's complex, multi-layer tax system rewards taxpayers who keep meticulous financial records year-round. Tracking income by source, separating business and personal expenses, and categorizing deductions as you go—rather than scrambling before April 15—makes filing dramatically easier and reduces your audit risk.

Beancount.io offers plain-text, open-format accounting that gives you complete transparency and control over your financial data. No black boxes, no vendor lock-in—just clean records you can review and verify at any time. Get started for free and see why developers and finance professionals rely on plain-text accounting to stay organized through even the most complex tax seasons.