California treats every gain as ordinary income
California is the costliest state for a large gain. There is no lower rate for assets held over a year, so a long-term stock sale is taxed exactly like salary, through nine brackets that reach 12.3%. A sale that carries the year’s taxable income past $1 million also brings in the Behavioral Health Services Tax, a further 1% on the slice beyond that mark. Add the 20% federal rate and 3.8% NIIT and a seven-figure gain can face a combined marginal rate above 37%.
California also does not follow some federal breaks: qualified small business stock under section 1202 and opportunity-zone deferral are not available on the state return, so a gain that is federally exempt can still be fully taxable here. Residents owe tax on gains wherever the asset sits; a nonresident owes California tax on California real estate and other California-source property.
| Parameter | Value | Effective | Primary source |
|---|---|---|---|
| Rates on taxable income, gains included | Nine brackets, 1% to 12.3% | 2026 tax year, indexed 3.4% | FTB indexing memo, September 3, 2026 |
| 12.3% bracket starts | $768,213 single or separate; $1,044,771 head of household; $1,536,426 joint | 2026 tax year | FTB indexing memo, Schedules X / Y / Z |
| Behavioral Health Services Tax | 1% of taxable income above $1,000,000; the threshold does not double for joint returns | 2026 estimated tax year | FTB 2026 Form 540-ES instructions |
| Exemption credit phaseout begins | Federal AGI $260,778 single or separate; $391,173 head of household; $521,561 joint | 2026 tax year | FTB indexing memo, section 17054.1 |
California uses ordinary income rates for short-term and long-term gains
California does not give long-term capital gains a lower state rate. The sale enters California taxable income after state basis, netting, loss carryovers and Schedule CA adjustments are resolved. The federal holding-period control changes the federal estimate; it does not turn the California gain into a preferential 15% category. Prepare the annual California taxable income without this sale and with it rather than copying federal ordinary income or NIIT MAGI.
The September 3, 2026 Franchise Tax Board indexing memorandum reproduced by CalTax supplies the actual 2026 indexed schedules: nine rates from 1% to 12.3%, with a $11,456 first single / separate threshold, $22,912 joint threshold and $22,927 head-of-household threshold. The memo reports 3.4% California inflation. Those thresholds are different from the 2025 schedules used in the initially issued 2026 estimated-tax worksheet. This calculator uses the memo’s printed dollar bases and separately approved state filing status. At the October 2 source review the Franchise Tax Board had not yet published final 2026 filing schedules or a 2026 resident booklet, so this is a schedule estimate rather than a replacement for prescribed filing tax tables.
The additional 1% Behavioral Health Services Tax applies to taxable income above $1,000,000. Current section 17043 excludes both ordinary credit offsets and filing-status bracket recomputation for that separate tax. A joint return therefore does not receive a $2 million threshold, and a credit that erases regular tax cannot erase this additional tax. The worksheet displays each annual regular amount, the separate tax and the usable regular-tax credits before comparing the two total state estimates.
Enter the full nonrefundable credits actually usable against regular tax in each scenario, including approved exemption credits after any income-based reduction. An unchanged family does not imply unchanged credits when a gain raises federal AGI. The memo’s 2026 exemption-credit phaseout starts at $260,778 single / separate, $391,173 head and $521,561 joint / qualifying surviving spouse; legal increments and each credit’s restrictions must be resolved before entry. A blank credit amount leaves combined tax unknown. Payments and withholding are not credits that reduce liability.
For example, approved single taxable income of $100,000 without a sale and $200,000 with it produces regular schedule estimates of $5,617.56 and $14,917.56 before credits, an incremental $9,300 when both approved credit balances are zero. Neither scenario crosses the additional-tax threshold. This calculation uses complete annual state bases; it does not establish that every federal $100,000 gain increases the California base by exactly that amount. Actual deductions, conformity adjustments or credit changes can alter the comparison.
Confirm full-year California residency before using this mode. Part-year and nonresident returns, California-source real property, alternative minimum tax, refundable credits, other taxes and special return effects require independently prepared final liabilities. For taxable income at or below $100,000, prescribed filing-table intervals may differ from a continuous rate schedule. The statutory comparison rounds each annual schedule to cents and subtracts afterward; official return rounding and final filing instructions remain controlling.
California preparation checklist
- Approve California taxable income in both annual scenarios after state basis, legal losses, Schedule D / Schedule CA and actual deduction effects.
- Confirm state filing status separately; single / separate, joint / qualifying surviving spouse and head-of-household schedules differ.
- Resolve federal-AGI exemption-credit phaseout, actual usable nonrefundable credits and ordering before entering the full regular-tax credit totals.
- Keep the separate 1% tax above $1 million even when regular tax is fully offset; never double its threshold for a joint return.
- Use prepared final liabilities for AMT, refundable credits, other taxes, nonresident allocation or required filing-table / rounding effects.
FTB September 3, 2026 indexing memorandum, reproduced by CalTax: Attachment 2 schedules · Current section 17041: annual bracket indexing · Section 17043: separate 1% tax and credit prohibition · Section 17054.1: exemption-credit phaseout · Actual 2026 estimated-tax instructions. The earlier estimated-tax worksheet references 2025 schedules; this mode uses the newer indexing memo and independently approved state bases and usable credits.