San Diego residents pay two layers of income tax: federal brackets that run from 10% to 37%, and California state brackets that run from 1% to 12.3%, with an extra 1% on income above $1 million. There is no city or county income tax, so the San Diego tax brackets you need to plan around are the federal and California ones. Both systems are progressive, which means only the dollars that fall inside a given range get taxed at that range’s rate.
2026 Federal Income Tax Brackets
For tax year 2026, the IRS brackets for single filers are:
- 10% up to $12,400
- 12% from $12,401 to $50,400
- 22% from $50,401 to $105,700
- 24% from $105,701 to $201,775
- 32% from $201,776 to $256,225
- 35% from $256,226 to $640,600
- 37% above $640,600
Married couples filing jointly get roughly double the width at each step. The 10% bracket covers up to $24,800, 12% runs to $100,800, 22% reaches $211,400, 24% extends to $403,550, 32% covers up to $512,450, 35% runs to $768,700, and 37% kicks in above that.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2026 California State Income Tax Brackets
California adds nine brackets of its own, administered by the Franchise Tax Board. For single filers in 2026:
- 1% up to $11,079
- 2% from $11,080 to $26,264
- 4% from $26,265 to $41,452
- 6% from $41,453 to $57,542
- 8% from $57,543 to $72,724
- 9.3% from $72,725 to $371,479
- 10.3% from $371,480 to $445,771
- 11.3% from $445,772 to $742,953
- 12.3% at $742,954 and above
Married couples filing jointly move through the same 1% to 12.3% structure with wider bands at each rate. The underlying rates are set by Revenue and Taxation Code Section 17041, and the Franchise Tax Board adjusts the dollar thresholds each year for inflation.2California Legislative Information. California Revenue and Taxation Code 17041 – Imposition of Tax
How the Brackets Actually Work
The single most common misunderstanding: moving into a higher bracket does not raise the rate on all your income. If you’re single and earn $55,000, only the slice above $50,400 gets taxed at the federal 22% rate. Everything below sits in the 10% and 12% brackets and stays taxed at those lower rates. Your effective rate, meaning the total tax you pay divided by your total income, will always come in below your top bracket.
The same logic applies on the California side. A single San Diego filer earning $100,000 pays 1% on the first chunk, 2% on the next, and climbs through each band until the last dollars land in the 9.3% bracket. The effective state rate ends up well under 9.3%, though combined with federal tax the total obligation is still significant.
Standard Deductions Reduce the Income That Hits the Brackets
Before any bracket applies, you subtract the standard deduction from your gross income. For 2026, the federal standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A single person earning $55,000 only runs $38,900 through the federal bracket math.
California has its own standard deduction, and it is considerably lower than the federal amount. Deductions and credits differ between the two systems, so your California taxable income will not match your federal taxable income line for line, even on identical earnings.
The 1% Surcharge Above $1 Million
If your California taxable income exceeds $1 million, the Mental Health Services Act adds a 1% surcharge on every dollar above that threshold. Revenue and Taxation Code Section 17043 stacks this on the standard 12.3% top rate, producing an effective 13.3% ceiling for the state’s highest earners.3California Legislative Information. California Revenue and Taxation Code 17043 – Imposition of Tax
Residents whose California adjusted gross income reaches $1 million are also required to make estimated tax payments based on at least 90% of current-year liability, with quarterly due dates of April 15, June 15, September 15, and January 15 of the following year.4Franchise Tax Board. Estimated Tax Payments
Capital Gains Run Through the Same California Brackets
San Diego residents get hit harder on investment income than people in most other states, because California does not offer a preferential rate for long-term capital gains. Profit from selling stock, real estate, or other investments is taxed as ordinary income on the state side, running through the same nine brackets up to 12.3%, plus the 1% surcharge above $1 million.
Federal rules are more generous for assets held longer than a year. For 2026, single filers pay 0% on long-term gains up to $49,450 in taxable income, 15% up to $545,500, and 20% above that. Joint filers hit the 15% rate above $98,900 and the 20% rate above $613,700. Short-term gains on assets held a year or less are taxed at ordinary federal rates.
Stacked together, a San Diego seller with a large gain can face 15% or 20% federal plus up to 13.3% California on the same dollars. High-income sellers may also owe the 3.8% Net Investment Income Tax at the federal level, which applies when modified adjusted gross income exceeds $200,000 single or $250,000 joint and covers interest, dividends, capital gains, rental income, and royalties.5Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax The federal exclusion for a primary residence sale ($250,000 single, $500,000 married) softens the blow, but San Diego home gains routinely exceed those limits.
Payroll Taxes Take a Separate Bite
Income tax brackets get most of the attention, but payroll taxes come off every paycheck before you ever file a return. For 2026:
- Social Security: 6.2% of wages up to $184,500, matched by your employer. Self-employed workers pay both halves, totaling 12.4%.6Social Security Administration. Contribution and Benefit Base
- Medicare: 1.45% on all wages with no cap, matched by your employer.
- Additional Medicare Tax: an extra 0.9% on wages above $200,000 single or $250,000 joint. Your employer does not match this.7Internal Revenue Service. Topic No. 560 – Additional Medicare Tax
- California SDI: 1.3% of wages with no cap. California removed the wage ceiling in 2024, so every dollar of earnings is subject to this deduction.8Employment Development Department. Contribution Rates and Benefit Amounts
The SDI change catches higher earners off guard. Someone earning $300,000 now pays SDI on all of it, adding $3,900 a year on top of the income tax owed through the federal and California brackets.
No City or County Income Tax
Unlike residents of New York or Philadelphia, San Diegans owe no local income tax. Neither the city nor the county imposes one. The city’s own tax and fee page lists business taxes, transient occupancy taxes, and other fees, but no individual income tax.9City of San Diego. Taxes and Fees The San Diego County Treasurer-Tax Collector handles property taxes, not income.10San Diego County Treasurer-Tax Collector. Tax Collection Your income tax obligations as a San Diego resident begin and end with the federal and California brackets above.