California has the highest state income tax rate in the country at 13.3% on income above $1 million, and it has one of the most aggressive residency enforcement programs of any state. California does not automatically conform to federal tax law - every change to the IRC must be separately adopted by the California legislature, and California has selectively rejected some of the most valuable federal provisions including the OBBBA bonus depreciation restoration and the §1202 QSBS exclusion. For high-income taxpayers, founders, and business owners in or leaving California, the state's tax rules are a primary planning driver.
California 2026 Individual Income Tax Rates
1% - 9.3%: Standard brackets on income up to $625,369 (single) / $1,250,738 (MFJ).
10.3%: Income $625,369 - $1,000,000 (single) / $1,250,738 - $1,250,738 (MFJ). Note: California brackets are not fully indexed - verify current amounts with FTB.
11.3%: Income $1,000,001 - $1,250,738 (single).
12.3%: Income $1,250,739 - $1,000,000 (MFJ range).
13.3%: Income above $1 million (single) / above $1,250,738 (MFJ). The 1% Mental Health Services Tax adds to the 12.3% top rate.
Capital gains: Taxed as ordinary income - no preferential rate. A California resident pays 13.3% on long-term capital gains, not the federal 20%.
Residency: Domicile vs. Statutory Resident
California taxes residents on worldwide income. A "resident" is either: (1) a person whose domicile is California, or (2) a person who is in California for other than a temporary or transitory purpose for more than nine months during the tax year (statutory resident). Domicile is the place you intend to return to as your permanent home. Changing domicile from California requires both establishing a new domicile elsewhere and abandoning California domicile - simply spending time in another state is insufficient.
The FTB's "safe harbor" for individuals who have left California: a person who is outside California under an employment-related contract for at least 546 consecutive days is presumed to be a nonresident for that period. Outside that safe harbor, the FTB examines the "closest connections" - where you maintain your home, where your family is, where you are registered to vote, where your vehicles and professional licenses are registered, and where you spend time.
California will audit high-income taxpayers who claim to have left the state. The FTB actively examines nonresident claims by taxpayers who earned significant California-source income or who had substantial California ties before departure. Cell phone records, credit card transactions, social media check-ins, and airline records have all been used in FTB residency audits. A taxpayer who earns $5 million in their final "partial year" as a California resident and claims to have left mid-year should expect scrutiny on the departure date.
California's OBBBA Non-Conformity: What Does Not Apply
California has selective conformity to the IRC. As of 2026, California does NOT conform to several major OBBBA provisions:
- Bonus depreciation: California does not conform to federal bonus depreciation. California uses its own depreciation schedule - generally straight-line or MACRS without the bonus. A federal $180,000 truck deduction in year one becomes a much smaller California deduction over 5 years.
- §1202 QSBS exclusion: California does not conform to §1202. A founder who excludes $10 million of gain federally owes California income tax on the full gain at up to 13.3%.
- §179 expensing: California conforms to §179 but at lower limits - verify current California §179 limit with FTB as it has historically lagged the federal amount.
- OBBBA estate tax exemption: California has no estate tax, so the federal $15 million exemption is irrelevant at the state level.
The QSBS non-conformity is one of the most expensive California tax traps for startup founders. A founder who sells QSBS stock generating $15 million of gain owes zero federal income tax (100% §1202 exclusion). In California, the same $15 million gain is fully taxable at 13.3% - a $2 million California tax bill with no federal offset. California residency status at the time of sale is the threshold question. This is why pre-liquidity California residency changes are among the most actively planned transactions for startup founders.
The LLC Gross Receipts Fee
California LLCs pay both an $800 annual minimum franchise tax and a gross receipts fee based on total California income. The fee schedule: $0 for gross receipts under $250,000; $900 for $250,000 - $499,999; $2,500 for $500,000 - $999,999; $6,000 for $1,000,000 - $4,999,999; $11,790 for $5,000,000 and above. This fee applies regardless of whether the LLC has net income - a high-revenue, low-margin LLC pays the maximum fee even in a loss year. The fee is in addition to personal income tax on the partners' or members' shares of LLC income.
Authority: California Revenue and Taxation Code §17041 (California personal income tax rates - graduated rate schedule; 1% to 12.3% plus 1% Mental Health Services Tax on income above $1 million = 13.3% effective top rate); CA R&TC §17014 (resident defined - domiciliary or statutory resident; present for other than temporary or transitory purpose); CA R&TC §17016 (nonresident defined - individual who is not a resident); FTB Publication 1031 (guidelines for determining resident status - domicile factors, closest connections test, safe harbor for 546 consecutive days outside California under employment contract); CA R&TC §18501 et seq. (LLC taxes and fees - $800 minimum franchise tax plus gross receipts fee schedule; applicable to all California LLCs regardless of profitability); California Conformity to Federal Law (California generally conforms to IRC as of a specific date; selective non-conformity for bonus depreciation, §1202 QSBS, and certain other provisions; California Assembly Bill process for adopting federal changes); CA R&TC §17024.5 (California's selective conformity mechanism - California law conforms to federal IRC provisions with California modifications; non-conformity items require separate California computation); FTB Residency Audit Program (FTB actively audits claimed nonresidents and departing residents; documentation requirements; cell records, travel records, financial accounts used in audits).