To file a sole proprietorship in California, you don’t file anything with the Secretary of State at all. The state treats you and the business as the same legal person, so the setup work happens at the county clerk (for your business name), with tax agencies (for an EIN, seller’s permit, or payroll account if they apply), and with your city or county (for a local business license). Handle those pieces in the right order and you can start operating quickly. The tradeoff is personal liability: every debt or lawsuit the business takes on reaches your personal assets.
Skip the Secretary of State
This is the point that confuses most new owners. California sole proprietorships require no filing with the Secretary of State.1Franchise Tax Board. Sole Proprietorship Business Type That office handles LLCs, corporations, and partnerships. There is no articles-of-organization equivalent for a sole proprietor. Your registrations happen at the county level, with tax agencies, and with your local city.
Register Your Business Name at the County
If you plan to operate under your full legal name and nothing else, you can skip name registration entirely. Jane Doe running a consulting practice as “Jane Doe” needs no filing. Add anything beyond your surname and you trigger a Fictitious Business Name (FBN) registration, also called a DBA. “Jane Doe Marketing” and “Sunset Consulting” both require one.
Filing the FBN Statement
File the FBN statement with the County Clerk or County Recorder in the county where your business is located. Fees vary by county but generally run between $26 and $40 for a single name. You will provide the business name, your full legal name and address, and a description of the business. File before you begin transacting under the fictitious name.
An FBN statement is valid for five years from the filing date. To keep the name, you refile. California gives you one break here: if nothing has changed and you refile within 40 days of the expiration date, you skip republication.2California Legislative Information. California Business and Professions Code 17917 Miss that window or change any detail, and you republish.
Publish the Notice in a Newspaper
California requires you to publish the FBN statement in a newspaper of general circulation in the same county. The notice runs once a week for four consecutive weeks. You have 45 days from the filing date to begin publication.2California Legislative Information. California Business and Professions Code 17917
When the four weeks finish, the newspaper gives you an affidavit of publication. File that affidavit with the county clerk within 45 days after publication ends.2California Legislative Information. California Business and Professions Code 17917 Skipping this step leaves your registration incomplete. Publication costs vary widely; ask the county clerk for a list of approved newspapers, since smaller adjudicated papers usually charge far less than major dailies.
Get Your Tax IDs
Whether you need to register with any tax agency depends on what your business does and whether you hire anyone.
EIN or Just Your SSN
If it’s just you and you’re not selling taxable goods, your Social Security Number works as your federal tax ID. There’s no required federal registration. Many sole proprietors still get a Federal Employer Identification Number (EIN) to keep their SSN off invoices, W-9s, and bank account applications. The IRS issues EINs online for free in minutes.3Internal Revenue Service. Get an Employer Identification Number Third-party sites that charge for this are not the IRS; the IRS never charges for an EIN.
An EIN becomes mandatory the moment you hire an employee. It’s also required if you set up a retirement plan for yourself, such as a solo 401(k) or SEP-IRA.4Internal Revenue Service. Publication 1635 – Understanding Your EIN
State Payroll Account If You Hire
Hiring also triggers a California payroll tax account with the Employment Development Department (EDD). You must register within 15 days of paying more than $100 in wages in a calendar quarter.5Employment Development Department. Employers: Payroll Tax Account Registration The EDD uses your EIN to create the state account, which you’ll use to report Unemployment Insurance tax, Employment Training Tax, and State Disability Insurance withholdings.
Seller’s Permit If You Sell Goods
If your business sells or leases physical goods in California, you need a seller’s permit from the California Department of Tax and Fee Administration (CDTFA) before your first sale. The permit itself is free, though the CDTFA may require a security deposit based on your estimated sales volume to cover potential unpaid tax if the business later closes.6California Department of Tax and Fee Administration. Obtaining a Seller’s Permit
Apply through the CDTFA’s online registration portal with your business address, SSN or EIN, bank details, and estimated annual gross receipts. The CDTFA uses that estimate to assign a reporting frequency (monthly, quarterly, or annual); most new businesses start quarterly. The permit doubles as a resale certificate, letting you buy inventory from wholesalers without paying sales tax on those purchases.7California Department of Tax and Fee Administration. Do You Need a California Seller’s Permit
There’s a narrow exception for genuinely occasional sellers: no more than two sales in a 12-month period may not require a permit.7California Department of Tax and Fee Administration. Do You Need a California Seller’s Permit Everyone else, including seasonal vendors at farmers’ markets or holiday fairs, registers. The CDTFA also offers temporary permits for selling operations lasting 90 days or less at a single location.6California Department of Tax and Fee Administration. Obtaining a Seller’s Permit
Get Your Local Business License
State and federal registrations don’t satisfy city and county requirements. Most California municipalities require a general business license, often called a Business Tax Certificate, for any business operating within their boundaries. Annual renewal fees are common.
Contact both the city and the county where your business is physically located. If you work from home, the city may require a Home Occupation Permit before issuing the business license. Home occupation permits typically come with conditions: limits on customer foot traffic, restrictions on exterior signage, rules about storing inventory, and noise limits. Violating those conditions can get the permit revoked, and your business license goes with it.
Depending on what you do, specialized permits may apply. Food businesses need health permits from the county health department. Businesses modifying commercial space or hosting public gatherings may need fire department clearance or planning and zoning approval. These requirements sit with hundreds of separate cities and counties, so direct inquiry is the only way to build a complete checklist.
Workers’ Compensation the Day You Hire
California law requires workers’ compensation insurance the moment you hire even one employee.8Department of Industrial Relations. DWC FAQs for Employers There is no small-business exemption. You can obtain coverage from a private insurer or through the State Compensation Insurance Fund. Operating without it exposes you to criminal penalties and personal liability for any workplace injury.
A sole proprietor with no employees is not required to carry workers’ comp on themselves. You can purchase it, but California’s Division of Workers’ Compensation notes that health, life, and disability income insurance may be a more practical alternative for covering yourself.8Department of Industrial Relations. DWC FAQs for Employers
Filing Income Taxes
A sole proprietorship doesn’t file its own tax return. Business income and expenses flow onto your personal return through Schedule C (Profit or Loss From Business), attached to your Form 1040.9Internal Revenue Service. About Schedule C (Form 1040) The net profit gets taxed two ways: at your regular federal income tax rate, and through self-employment tax.
Self-Employment Tax
Self-employment tax runs 15.3%, split between 12.4% for Social Security and 2.9% for Medicare.10Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The Social Security portion applies only to net earnings up to $184,500 in 2026; the Medicare portion has no cap.11Social Security Administration. Contribution and Benefit Base You calculate this on Schedule SE and can deduct the employer-equivalent half (7.65%) as an adjustment to gross income. That deduction lowers your income tax but not the self-employment tax itself.
California State Income Tax
You use your federal Schedule C figures to complete your California return. The state does not impose a separate self-employment tax, but applies its progressive income tax rates to your adjusted gross income.
Quarterly Estimated Payments
Nobody is withholding income tax from your earnings, so you make estimated payments throughout the year. The IRS and the California Franchise Tax Board follow the same schedule:
- First quarter: April 15, 2026
- Second quarter: June 15, 2026
- Third quarter: September 15, 2026
- Fourth quarter: January 15, 2027
Federal payments go to the IRS; state payments go to the FTB.12Franchise Tax Board. Due Dates: Personal To avoid a federal underpayment penalty, your total payments must cover at least 90% of your current-year tax liability or 100% of last year’s, whichever is smaller.13Internal Revenue Service. Topic No. 306 – Penalty for Underpayment of Estimated Tax In your first year, with no prior return to lean on, aim for 90% of your projected liability. Underestimating here is one of the most expensive early mistakes, because the penalties accumulate quarterly and compound with interest.