CA
California Small Business Tax Guide
Understand CA taxes, common filings, and recordkeeping—educational overview, not tax advice.
Disclaimer: This page is educational content only. Tax laws change, and your situation may differ. It is not legal, tax, or financial advice. Consult a qualified professional licensed in California before making filing or planning decisions.
Tax landscape for small businesses
California small business taxes are among the highest in the nation. The state has the highest marginal income tax rate at 13.3%, which includes a 1% Mental Health Services surcharge on income over $1 million. Rates start at 1% and climb through nine brackets, affecting pass-through business owners at every income level.
The state sales tax is 7.25% — the highest base state sales tax in the country — and local district additions bring combined rates to 8.5%–10.75% in most areas. C corporations pay an 8.84% income tax with a minimum franchise tax of $800 per year that applies to all registered LLCs and corporations regardless of whether they earn any income.
Small business owners face significant compliance requirements in California. LLCs pay the annual $800 minimum franchise tax plus an additional fee based on gross receipts: $900 for receipts between $250,000 and $499,999, scaling up to $11,790 for receipts over $5 million. The Franchise Tax Board (FTB) handles income taxes while the California Department of Tax and Fee Administration (CDTFA) oversees sales and use taxes.
California does not fully conform to all federal tax provisions, notably setting its own lower Section 179 deduction limit. The state also does not allow net operating loss deductions in certain years. However, California offers a valuable Research and Development Tax Credit and the California Competes Tax Credit for businesses creating jobs in the state.
Despite the high tax burden, California's massive consumer market, deep talent pool, access to venture capital, and innovation ecosystem make it a powerhouse for small businesses. Tax planning is essential for California business owners to manage the combined federal-plus-state burden, which can exceed 50% at the highest income levels.
Tax overview
Approximate categories many small businesses review with an advisor. Rates and rules vary by year, industry, and entity—verify with official sources.
| Tax type | Typical rate / basis | Notes |
|---|---|---|
| Income Tax | 1%–13.3% | Nine brackets; top rate includes 1% Mental Health Services surcharge on income over $1M. |
| Sales Tax | 7.25% state + local | Combined rates typically 8.5%–10.75% with district and city surcharges. |
| Property Tax | ~1% of assessed value | Prop 13 caps the base rate at 1%; reassessment occurs on ownership change. |
| Corporate Tax | 8.84% | $800 minimum franchise tax applies to most LLCs and corporations regardless of income. |
Filing requirements
Common themes—not a complete checklist for your business.
California income tax return (Form 540)
File Form 540 with the Franchise Tax Board by April 15. Pass-through income from LLCs, S corps, and partnerships flows to individual returns. California starts with federal adjusted gross income and applies numerous state-specific modifications. Automatic extensions run to October 15, but any tax owed is still due by the original deadline.
Quarterly estimated tax payments
Required if you expect to owe $500 or more in California income tax. Use Form 540-ES with payments due in April, June, September, and January. California's estimated payment schedule requires 30% in Q1, 40% in Q2, 0% in Q3, and 30% in Q4 — a non-standard split that catches many business owners off guard.
Sales and use tax filing (CDTFA)
Register with the California Department of Tax and Fee Administration for a seller's permit. Filing frequency depends on volume — most businesses file monthly or quarterly. California has hundreds of local tax jurisdictions with varying district tax rates, making accurate rate determination essential for each transaction location.
LLC annual fee and franchise tax
LLCs owe an $800 minimum franchise tax plus an additional fee if gross receipts exceed $250,000 (from $900 to $11,790 based on revenue tiers). Both are due to the Franchise Tax Board. The $800 minimum applies in the first year of existence and every year thereafter regardless of income or activity level.
S corporation and partnership returns
S corporations file Form 100S and partnerships file Form 565 with the Franchise Tax Board. These are informational returns that report each owner's share of income. California S corporations are also subject to a 1.5% tax on net income with a minimum of $800, which is an additional burden not present in many other states.
Employer payroll tax registration
Businesses with employees must register with the Employment Development Department (EDD) for state income tax withholding, unemployment insurance, disability insurance, and the Employment Training Tax. California has a separate state disability insurance program funded through employee payroll deductions.
Common deductions & write-offs
Often discussed at the federal level; state conformity differs.
- Home office deduction (California conforms to the federal simplified and regular methods)
- Business equipment under Section 179 (California has its own lower limit — verify current conformity before claiming)
- Health insurance premiums for self-employed filers, their spouses, and dependents
- Retirement plan contributions to SEP-IRA, Solo 401(k), or SIMPLE IRA within federal limits
- California R&D tax credit for qualifying research activities conducted in the state (no cap and can be carried forward)
- Professional licensing fees and continuing education required by California regulatory boards
- Business insurance premiums including general liability, professional liability, and workers' compensation
- Vehicle expenses for documented business use within California using the IRS standard mileage rate or actual-cost method
Practical tips
- Plan for California's $800 minimum franchise tax on LLCs and corporations — it is due even if your business earns zero income for the entire year.
- California does not fully conform to federal Section 179 limits — check current year conformity before claiming large equipment deductions on your state return.
- Set aside 30%–40% of net income for combined federal and California tax obligations if you are self-employed.
- Track district-level sales tax rates precisely since California has hundreds of different local tax jurisdictions — use the CDTFA rate lookup tool.
- Consider the California Competes Tax Credit if your business is expanding operations or creating jobs in the state.
- Be aware of California's non-standard estimated tax payment schedule: 30%/40%/0%/30% instead of the federal 25%/25%/25%/25% split.
- If your LLC has gross receipts over $250,000, budget for the additional LLC fee that scales up to $11,790 based on total revenue.
- Explore the Pass-Through Entity Elective Tax (PTET) to potentially work around the federal $10,000 SALT deduction cap on your California taxes.
Related Resources
Frequently asked questions
Explore More State Tax Guides
Get Started with Billed in California
Invoicing and expense tracking help you stay organized for California and federal obligations. Start free—then talk to your CPA about filings.
No credit card required. Cancel anytime.