Corporations Code §17701, Secretary of State filings, the $800 franchise tax, and choosing the right entity for your San Diego business
By John Quigley · Updated June 11, 2026
Starting a business in San Diego County means making one decision before almost any other: what legal entity will you operate under? The choice between a sole proprietorship, an LLC, an S-Corporation, and a C-Corporation affects your personal liability, your tax bill, your ability to raise money, and even how you sign contracts. California's rules are codified primarily in the California Corporations Code — the Revised Uniform Limited Liability Company Act (RULLCA) at Corporations Code §17701.01 et seq. for LLCs and the General Corporation Law at Corporations Code §100 et seq. for corporations — and the tax consequences flow through the Revenue & Taxation Code.
This guide walks through each entity type, the actual filing process with the California Secretary of State, the franchise taxes nobody warns you about, and the local steps specific to operating in the City of San Diego and surrounding cities like Chula Vista, Carlsbad, and El Cajon.
The core reason most founders form an entity is the liability shield. A properly formed and maintained LLC or corporation is a legal person separate from its owners. Under Corporations Code §17703.04, the debts, obligations, and liabilities of an LLC "do not become the debts, obligations, or other liabilities of a member or manager" solely by reason of their status as a member or manager. Corporations enjoy a parallel rule: shareholders are generally not personally liable for corporate debts beyond their investment.
That shield is not absolute. California courts can "pierce the corporate veil" under the alter ego doctrine when owners commingle personal and business funds, ignore formalities, or undercapitalize the entity to defraud creditors. San Diego Superior Court — which handles business disputes at the Hall of Justice downtown and through its Civil Division — sees veil-piercing claims regularly in collection and breach-of-contract litigation. Forming the entity is step one; respecting it as a separate legal person is what keeps the protection intact.
The default for a single owner who files nothing. There is no liability protection — you and the business are legally identical. If you operate under a name other than your own surname, California Business & Professions Code §17910 requires you to file a Fictitious Business Name (FBN) statement; in San Diego County, that filing goes to the County Clerk's office, and §17917 requires publication in a county newspaper of general circulation once a week for four consecutive weeks. Sole proprietorships make sense only for very low-risk activities, and even then an LLC is usually worth the cost.
California LLCs are governed by RULLCA, enacted at Corporations Code §17701.01 through §17713.13. You form one by filing Articles of Organization (Form LLC-1) with the Secretary of State under §17702.01. LLCs offer:
One important California limitation: under Corporations Code §17701.04(e) and related professional licensing rules, most state-licensed professionals (doctors, lawyers, accountants) generally cannot use an LLC to render professional services and must instead form a professional corporation under the Moscone-Knox Professional Corporation Act (Corporations Code §13400 et seq.).
A California corporation is formed by filing Articles of Incorporation (Form ARTS-GS) under Corporations Code §200. C-Corps pay California's 8.84% corporate franchise tax on net income (Revenue & Taxation Code §23151) plus federal corporate tax, and shareholders pay tax again on dividends — the famous "double taxation." In exchange, C-Corps offer the structure venture investors expect: multiple stock classes, stock option pools, and clean equity transfers. San Diego's biotech corridor in Torrey Pines and Sorrento Valley, and the startup community downtown and in UTC, are full of Delaware C-Corps registered in California as foreign corporations — which still triggers California registration under Corporations Code §2105 and California franchise taxes under Revenue & Taxation Code §23101.
An S-Corp is not a separate California entity type — it is a federal tax election under Subchapter S of the Internal Revenue Code, made on IRS Form 2553 by a qualifying corporation (or an LLC electing corporate treatment). California recognizes the election but still imposes a 1.5% tax on net income, with an $800 minimum, under Revenue & Taxation Code §23802. The draw: owner-employees take a reasonable salary subject to payroll taxes, and remaining profits pass through free of self-employment tax. The trade-offs: a 100-shareholder cap, one class of stock, U.S. resident shareholders only, and real payroll compliance obligations with the EDD.
| Feature | LLC | S-Corp | C-Corp |
|---|---|---|---|
| Governing law | Corp. Code §17701.01 et seq. (RULLCA) | Corp. Code §100 et seq. + IRC Subchapter S | Corp. Code §100 et seq. |
| CA entity tax | $800 minimum (R&T §17941) + gross-receipts fee (§17942) | 1.5% of net income, $800 min (R&T §23802) | 8.84% of net income, $800 min (R&T §23151, §23153) |
| Federal taxation | Pass-through (default) | Pass-through | Entity-level + dividend tax |
| Self-employment tax | Generally on all profits | Only on salary portion | N/A (wages only) |
| Ownership limits | None | ≤100 shareholders, one stock class | None |
| Best for | Small businesses, real estate, services | Profitable owner-operated businesses | Venture-backed startups, larger companies |
State formation is only half the job. Operating in San Diego County adds local requirements:
Many San Diego founders form in Delaware, Nevada, or Wyoming hoping to avoid California taxes. It rarely works. Under Revenue & Taxation Code §23101, an entity is "doing business" in California if it actively engages in any transaction for the purpose of financial or pecuniary gain in the state — or if its California sales, property, or payroll exceed indexed thresholds (California sales above roughly $700,000, or 25% of total sales, among other triggers). An entity doing business here must register as a foreign entity under Corporations Code §2105 (corporations) or §17708.02 (LLCs), pay the same $800 minimum franchise tax, and file California returns. The practical result for a business actually operated from San Diego: forming out of state usually means paying two states' fees instead of one, plus penalties if you skipped registration. Under Corporations Code §17708.07 and §2203, an unregistered foreign entity also cannot maintain a lawsuit in California courts until it registers and pays back fees — a painful discovery when you need to sue a customer in San Diego Superior Court.
Plenty of single-member LLCs are formed without a lawyer. But certain situations carry enough risk that legal advice pays for itself: co-founder arrangements (who owns what, what happens when someone leaves), businesses raising outside money (securities law compliance under Corporations Code §25110 et seq.), professionals restricted to professional corporations, buying or converting an existing business, and any venture where the entity will hold real estate or significant contracts. A San Diego business attorney can also coordinate entity choice with your CPA — the LLC-vs-S-Corp decision is ultimately a tax-modeling question as much as a legal one.
You can browse vetted local counsel on our San Diego business law attorneys page, or explore all practice areas in our directory.
Our directory connects you with experienced California attorneys across San Diego County.
Find an Attorney