California brokerage account growth calculator

What a taxable index-fund account is actually worth after expense-ratio drag and after California takes its share of the gain — which, in most states, is not at the federal preferential rate.

California taxes your gains as ordinary income

There is no state equivalent of the federal preferential rate here — a long-term gain is charged at California's normal income brackets, exactly like wages. This is the common case, and it surprises people who assume the federal 15% carries over. Long-term capital gains are taxed as ordinary income at the full 1%-12.3% schedule, with no preferential rate, no exclusion, and no holding-period benefit. The 2025 Instructions for Schedule CA (540) say so in as many words on the capital gain line: California taxes long and short term capital gains as regular income, and no special rate for long term capital gains exists. Adjustments on that line arise only where California and federal BASIS differ. Combined with the 1% Behavioral Health Services Tax described in the brackets source, the top marginal rate on a long-term gain for a California resident is 13.3% -- the highest state capital gains rate in the country, and a figure that surprises people who assume the preferential federal treatment carries over to the state return.