California Capital Gains Tax, Explained

Most eligible long-term gains use the federal 0%, 15%, or 20% rate bands. California applies ordinary income rates to capital gains. Filing status, taxable income, adjustments, and asset-specific rules affect the final calculation.

A gain can cross several California rate bands. Adding the top federal and state rates describes a possible marginal rate on a particular slice of income; it does not calculate the average tax on an entire sale.

This hypothetical assumes the entire taxable gain falls in those specified rate bands. It excludes NIIT, credits, losses, alternative minimum tax, special-rate gains, and other return interactions. It is not a calculation for a particular filing status or household.

• QSBS: California does not conform to the federal Sections 1045 and 1202 deferral and exclusion. Calculate the California adjustment separately when evaluating a business sale or stock exit.
• Opportunity Zones: California does not conform to federal capital-gain deferral and exclusion for qualified opportunity zone investments. Track amounts already recognized for California purposes to avoid duplicate inclusion.
• Long-term rates: California uses ordinary income rates even when a gain qualifies for a lower federal rate.

A qualifying 1031 exchange can defer gain on investment or business real property. Receiving out-of-state replacement property does not itself trigger the deferred tax, but an exchange of California property for out-of-state property requires Form FTB 3840 for the exchange year and generally each subsequent year until the California-source deferred gain or loss is recognized. Review the reporting obligation even when no other California return is required.

California real-estate sales may require withholding through Form 593, subject to exemptions and available calculation methods. Withholding is a prepayment credited against the return, rather than the final tax on the sale. Review escrow requirements before closing.

Prior rental depreciation affects adjusted basis. Federally, unrecaptured Section 1250 gain may face up to 25%, while Section 1245 assets can produce ordinary-income recapture. California basis and depreciation adjustments can differ.

Residency and sourcing are separate tests. A bona fide move can affect the sourcing of stock and other intangibles, subject to exceptions. It does not remove California-source income. Distinguish these cases:

• California real estate: gains remain sourced to California for a nonresident.
• Installment gains: California property and stock sold while a California resident can remain taxable. Out-of-state real-property installments may have different treatment after a genuine move.
• Deferred exchange gains: preserve California sourcing and track them through FTB 3840.

• Which federal and California basis adjustments apply?
• Can a qualifying installment sale or exchange fit the transaction, including recapture and reporting?
• What do residency and sourcing facts establish?
• How do losses, charitable goals, and income timing affect the full return?
• Which withholding and estimated payments are required?

Use the California estimated-tax guide alongside the capital-gain analysis. California uses a 30% / 40% / 0% / 30% installment pattern. Its prior-year safe harbor is unavailable at California AGI of $1 million or more ($500,000 for married/RDP filing separately); annualized-income rules can matter for a late-year sale.