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Freelancers in San Diego, CA: taxes and retirement for 2026
For freelance designers, developers, writers and other 1099 professionals in San Diego, CA. California has a graduated state income tax for 2026: 1% to 13.3% (top rate starts at $1,000,000 for single filers). Here are the 2026 rules, a worked example and the official sources.
What's different in San Diego
- Local income tax
- No city income tax in San Diego.
- City of San Diego Business Tax
- The annual Business Tax Certificate fee is $34 for a business with 12 or fewer employees (including a one-person sole proprietorship), or $125 plus $5 per employee for 13 or more employees. Businesses operating without paying are billed retroactively up to three years with late fees and a $68 surcharge for small businesses.
- City business license
- All businesses operating in the City of San Diego, including home-based businesses, self-employed individuals, and independent contractors, must register for a Business Tax Certificate within 15 days of starting to avoid late fees.
- Also worth knowing
- No city income tax: California Revenue and Taxation Code section 17041.5 bars California cities and counties from taxing income. For hospitality employees (such as servers and bartenders at covered hotels, event centers, and amusement parks), San Diego's Hospitality Minimum Wage Ordinance took effect July 1, 2026 at $19.00 per hour for hotels and amusement parks and $21.06 for event centers (https://www.sandiego.gov/labor-and-wage/minimum-wage/hospitality). The citywide minimum wage rises to $18.35 per hour on January 1, 2027 (https://www.sandiego.gov/labor-and-wage). A state-mandated $4.00 disability-access fee (SB 1186) is also collected with business tax certificates (https://www.sandiego.gov/treasurer/taxesfees/btax/btaxfees).
California rules for freelancers
- State income tax (2026)
- California has a graduated state income tax for 2026: 1% to 13.3% (top rate starts at $1,000,000 for single filers). Rates run from 1% to 12.3%, plus a 1% Behavioral Health Services Tax (formerly the Mental Health Services Tax) on taxable income over $1,000,000, for a combined top rate of 13.3%. The 2026 540-ES worksheet tells filers to figure estimated tax using the 2025 tax table. In 2025, the 12.3% bracket started at $742,953 for single filers (ftb.ca.gov/forms/2025/2025-540-tax-rate-schedules.pdf).
- State estimated tax
- You generally must pay if you expect to owe at least $500 ($250 if married/RDP filing separately) for 2026 after withholding and credits, and your withholding plus credits will be less than the smaller of 90% of your 2026 tax or 100% of your 2025 tax. Use 110% if your 2025 California AGI was over $150,000, and if your 2026 AGI is $1,000,000 or more you must base payments on your 2026 tax. Uneven installments: 30% by April 15, 2026, 40% by June 15, 2026, 0% for September 15, 2026, and 30% by January 15, 2027. Form 540-ES.
- California LLC annual tax and LLC fee
- Every LLC doing business in or registered in California, including a single-member LLC, pays an $800 annual tax by the 15th day of the 4th month of its tax year. LLCs with total California income of $250,000 or more also pay an LLC fee, estimated and paid by the 15th day of the 6th month: $900 ($250,000 to $499,999), $2,500 ($500,000 to $999,999), $6,000 ($1M to $4,999,999), or $11,790 ($5M or more). The first-year exemption from the $800 tax covered only tax years beginning in 2021 through 2023.
- AB 5 ABC test (Labor Code 2775)
- A worker is presumed to be an employee unless the hiring entity proves all three parts: (A) the worker is free from its control and direction, (B) the work is outside its usual course of business, and (C) the worker is customarily engaged in an independently established trade of the same nature. Certain occupations and business-to-business arrangements use the older Borello test instead.
- Proposition 22 (app-based rideshare and delivery drivers)
- App-based drivers are independent contractors if the company does not set their hours, require them to accept specific requests, or restrict work for other companies. Drivers get a net earnings floor of 120% of the applicable minimum wage for engaged time (from accepting a request to completing it) plus a per-mile payment for engaged miles ($0.30 in 2021, adjusted for inflation each year).
- Freelance Worker Protection Act (SB 988, Bus. & Prof. Code 18100 et seq.)
- Covers freelancers hired for professional services worth $250 or more (alone or combined over 120 days) on contracts made or renewed on or after January 1, 2025. The hiring party must give a signed written contract, keep it for at least 4 years, and pay on the contract date or within 30 days of completion. Freelancers can recover damages and attorney's fees.
- Transportation Network Company Drivers Labor Relations Act (AB 1340, Stats. 2025, Ch. 335)
- Effective January 1, 2026, rideshare (TNC) drivers in California have the right to form, join, and take part in driver organizations and to bargain collectively with rideshare companies over terms and conditions of work. PERB administers the Act (Bus. & Prof. Code 7470 to 7470.21).
- State retirement program
- CalSavers Retirement Savings Program is live. It is built around W-2 employers and does not cover 1099 contractors through the employer mandate; self-employed residents can enroll on their own.
Federal rules for 2026
Self-employment tax
On top of income tax, self-employed people pay 15.3% on 92.35% of net profit: 12.4% Social Security up to the 2026 wage base of $184,500, plus 2.9% Medicare with no cap. Half of it is deductible.
All income counts, form or no form
Clients and marketplaces send 1099-NEC or 1099-K forms only above IRS reporting thresholds, but every dollar of freelance income is taxable whether or not a form arrives.
Home office and tools
If you use part of your home regularly and only for work, the simplified home-office deduction is $5 per square foot up to 300 square feet. Software, equipment and a business share of your phone and internet are deductible too.
Quarterly estimated taxes
No one withholds tax from self-employment income, so you generally pay estimates four times a year if you expect to owe $1,000 or more. For 2026 income the federal dates are April 15, June 15 and September 15, 2026, and January 15, 2027. Paying 100% of last year's tax (110% if your AGI was over $150,000) in four equal installments avoids the underpayment penalty.
A worked example
| Self-employment tax | $12,010 |
|---|---|
| Self-employment tax per quarter | $3,003 |
| Solo 401(k) maximum | $40,299 |
| SEP IRA maximum | $15,799 |
Federal figures only. Income tax comes on top; the quarterly tax calculator estimates both. Computed from 2026 IRS limits (Notice 2025-67, Rev. Proc. 2025-32) and the SSA wage base.
Free tools
Guides by job and platform
Questions
Is there a local income tax in San Diego?
No city income tax applies in San Diego. California has a graduated state income tax for 2026: 1% to 13.3% (top rate starts at $1,000,000 for single filers).
What local business taxes apply to self-employed freelancers in San Diego?
City of San Diego Business Tax: The annual Business Tax Certificate fee is $34 for a business with 12 or fewer employees (including a one-person sole proprietorship), or $125 plus $5 per employee for 13 or more employees. Businesses operating without paying are billed retroactively up to three years with late fees and a $68 surcharge for small businesses.
Do I need a business license to freelance from home in San Diego?
All businesses operating in the City of San Diego, including home-based businesses, self-employed individuals, and independent contractors, must register for a Business Tax Certificate within 15 days of starting to avoid late fees.
Do freelancers in California pay state income tax?
California has a graduated state income tax for 2026: 1% to 13.3% (top rate starts at $1,000,000 for single filers). Rates run from 1% to 12.3%, plus a 1% Behavioral Health Services Tax (formerly the Mental Health Services Tax) on taxable income over $1,000,000, for a combined top rate of 13.3%. The 2026 540-ES worksheet tells filers to figure estimated tax using the 2025 tax table. In 2025, the 12.3% bracket started at $742,953 for single filers (ftb.ca.gov/forms/2025/2025-540-tax-rate-schedules.pdf).
When are California estimated tax payments due for 2026?
You generally must pay if you expect to owe at least $500 ($250 if married/RDP filing separately) for 2026 after withholding and credits, and your withholding plus credits will be less than the smaller of 90% of your 2026 tax or 100% of your 2025 tax. Use 110% if your 2025 California AGI was over $150,000, and if your 2026 AGI is $1,000,000 or more you must base payments on your 2026 tax. Uneven installments: 30% by April 15, 2026, 40% by June 15, 2026, 0% for September 15, 2026, and 30% by January 15, 2027. The state form is 540-ES.
Are there other California taxes for self-employed freelancers?
California LLC annual tax and LLC fee: Every LLC doing business in or registered in California, including a single-member LLC, pays an $800 annual tax by the 15th day of the 4th month of its tax year. LLCs with total California income of $250,000 or more also pay an LLC fee, estimated and paid by the 15th day of the 6th month: $900 ($250,000 to $499,999), $2,500 ($500,000 to $999,999), $6,000 ($1M to $4,999,999), or $11,790 ($5M or more). The first-year exemption from the $800 tax covered only tax years beginning in 2021 through 2023.
What California laws affect independent contractors and gig workers?
AB 5 ABC test (Labor Code 2775): A worker is presumed to be an employee unless the hiring entity proves all three parts: (A) the worker is free from its control and direction, (B) the work is outside its usual course of business, and (C) the worker is customarily engaged in an independently established trade of the same nature. Certain occupations and business-to-business arrangements use the older Borello test instead. Proposition 22 (app-based rideshare and delivery drivers): App-based drivers are independent contractors if the company does not set their hours, require them to accept specific requests, or restrict work for other companies. Drivers get a net earnings floor of 120% of the applicable minimum wage for engaged time (from accepting a request to completing it) plus a per-mile payment for engaged miles ($0.30 in 2021, adjusted for inflation each year). Freelance Worker Protection Act (SB 988, Bus. & Prof. Code 18100 et seq.): Covers freelancers hired for professional services worth $250 or more (alone or combined over 120 days) on contracts made or renewed on or after January 1, 2025. The hiring party must give a signed written contract, keep it for at least 4 years, and pay on the contract date or within 30 days of completion. Freelancers can recover damages and attorney's fees. Transportation Network Company Drivers Labor Relations Act (AB 1340, Stats. 2025, Ch. 335): Effective January 1, 2026, rideshare (TNC) drivers in California have the right to form, join, and take part in driver organizations and to bargain collectively with rideshare companies over terms and conditions of work. PERB administers the Act (Bus. & Prof. Code 7470 to 7470.21).
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Sources
- www.ftb.ca.gov/forms/2026/2026-540-es-instructions.pdf
- www.dir.ca.gov/dlse/minimum_wage.htm
- www.ftb.ca.gov/file/business/types/limited-liability-company/index.html
- www.dir.ca.gov/dlse/faq_independentcontractor.htm
- vig.cdn.sos.ca.gov/2020/general/pdf/topl-prop22.pdf
- leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240SB988
- perb.ca.gov/laws-and-regulations/rulemaking/rulemaking-transportation-network-company-drivers-labor-relations-act
- leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=17041.5
- www.sandiego.gov/treasurer/taxesfees/btax/btaxfees
- www.sandiego.gov/sites/default/files/2024-03/btaxappinstruction_english_03142024.pdf
State and local facts researched from official sources and independently re-checked; last verified October 2026, next scheduled review 2027-01-02. Educational information for 2026, not tax, legal or investment advice. Rules change; check the official sources listed and a tax professional for your situation. Gigaverse AI, Inc. is a financial technology company, not a bank, and not itself a registered investment adviser or broker-dealer.