Educational use only. This guide is for
general educational purposes and is not financial, tax, legal, or accounting advice. Tax
rules can change and individual facts matter. Verify the information with official
sources and a qualified professional before making tax or financial decisions.
1. Build California Income Base
California wage income treatment differs from the federal calculation because HSA contributions remain taxable in this guide.
California income base = total gross wages - pre-tax medical - pre-tax
401(k) - pre-tax FSA
2. Subtract California Deduction
| 2026 California standard deduction | Amount |
|---|---|
| Single | $5,706 |
| Married filing jointly | $11,412 |
| Married filing separately | $5,706 |
| Head of household | $11,412 |
California deductible mortgage interest = mortgage interest paid ×
min(1, $1,000,000 ÷ average mortgage balance)
California itemized deduction = property tax paid + California deductible mortgage interest
California taxable income = max(0, California income base - selected California deduction)
California itemized deduction = property tax paid + California deductible mortgage interest
California taxable income = max(0, California income base - selected California deduction)
3. Apply Brackets and Surtax
| Status | 1% | 2% | 4% | 6% | 8% | 9.3% | 10.3% | 11.3% | 12.3% |
|---|---|---|---|---|---|---|---|---|---|
| Single / MFS | $0-$11,079 | $11,079-$26,264 | $26,264-$41,452 | $41,452-$57,542 | $57,542-$72,724 | $72,724-$371,479 | $371,479-$445,771 | $445,771-$742,953 | Over $742,953 |
| Married filing jointly | $0-$22,158 | $22,158-$52,528 | $52,528-$82,904 | $82,904-$115,084 | $115,084-$145,448 | $145,448-$742,958 | $742,958-$891,542 | $891,542-$1,485,906 | Over $1,485,906 |
| Head of household | $0-$22,173 | $22,173-$52,530 | $52,530-$67,716 | $67,716-$83,805 | $83,805-$98,990 | $98,990-$505,208 | $505,208-$606,251 | $606,251-$1,010,417 | Over $1,010,417 |
California bracket tax = sum of each taxable slice × that slice's
rate
Mental Health Services Tax = max(0, California taxable income - $1,000,000) × 1%
Mental Health Services Tax = max(0, California taxable income - $1,000,000) × 1%
4. Subtract Exemption Credits
| Credit | Amount |
|---|---|
| Single, married filing separately, head of household | $153 |
| Married filing jointly | $306 |
| Dependent exemption credit | $475 per dependent |
California income tax = max(0, bracket tax + Mental Health Services Tax
- exemption credits)