In California, licensed professionals cannot choose between a Professional Corporation and an LLC the way an unlicensed business owner can. State law bars LLCs from delivering professional services, so if you hold a California license and want to incorporate your practice, the Professional Corporation is the required vehicle. That is the practical core of the California Professional Corporation versus LLC question, and Corporations Code Section 17701.04(e) is where the rule lives.1California Legislative Information. California Code CORP 17701.04 – General Provisions
Why California Blocks LLCs for Licensed Work
An LLC’s main appeal is its liability shield. For California’s licensing system, that shield is the problem. The state wants licensed practitioners to remain personally answerable for substandard work, and an LLC would let a negligent professional sit behind the entity while an injured client was left with nowhere to go. Section 17701.04(e) closes the door directly: nothing in the LLC title permits a domestic or foreign LLC to render professional services as defined in Section 13401.1California Legislative Information. California Code CORP 17701.04 – General Provisions
A standard business corporation is off the table for a different reason. Regular corporations place no restrictions on who can own shares or hold office, so an unlicensed investor could end up controlling a medical practice or a law firm with no obligation to the licensing board. The Professional Corporation, governed by the Moscone-Knox Professional Corporation Act, solves both issues at once: corporate-style protection against ordinary business debts, with ownership and management locked to licensed hands.2California Legislative Information. California Corporations Code 13400 – Moscone-Knox Professional Corporation Act
Who Has to Use a PC Instead of an LLC
Corporations Code Section 13401 defines professional services as any service that can only be lawfully performed under a license, certification, or registration issued under the Business and Professions Code, the Chiropractic Act, or the Osteopathic Act.3California Legislative Information. California Code CORP 13401 – Professional Corporations Section 13401.3 adds yacht and ship brokers licensed under the Harbors and Navigation Code.4California Legislative Information. California Code Corporations Code CORP 13401.3 – Professional Services
In practice, the PC requirement reaches physicians, dentists, optometrists, physical therapists, psychologists, pharmacists, attorneys, certified public accountants, architects, engineers, veterinarians, licensed clinical social workers, marriage and family therapists, and chiropractors, among others. The working test is simple: if California requires a state-issued license before you can perform the work, you almost certainly cannot deliver that work through an LLC.
What the PC Shield Actually Covers
A PC protects shareholders from the corporation’s ordinary business obligations the same way any corporation would. If the practice takes on debt or faces a breach-of-contract claim, individual owners are generally insulated. The shield has one deliberate hole, and it is the hole that explains why California accepts the PC but not the LLC: personal malpractice is not covered. A surgeon who botches a procedure, a lawyer who misses a filing deadline, an accountant who signs off on a fraudulent return — each stays personally liable regardless of the corporate wrapper.
Because malpractice claims can appear years after the underlying work, PC shareholders should carry adequate professional liability insurance. If a practitioner retires or the PC winds down under a claims-made policy, tail coverage keeps protection in place for claims filed after the policy ends, and typically costs 1.5 to 2 times the annual premium.
Ownership and Management Rules You Don’t Get With an LLC
An LLC can be owned by almost anyone. A PC cannot. The Moscone-Knox restrictions are strict, and they are the trade-off that comes with being allowed to incorporate in the first place.
Who Can Hold Shares
Shares in a PC can only be issued to a person who holds the appropriate professional license. Shares issued to an unlicensed person are automatically void. Shareholders cannot grant voting trusts or proxies to anyone who isn’t already a shareholder of the same corporation, which blocks outside investors from gaining indirect control through voting arrangements.5California Legislative Information. California Code Corporations Code CORP 13406 – Shares of Capital Stock
Cross-Disciplinary Shareholders
Section 13401.5 opens a limited exception. Professionals in related fields can own up to 49% of a PC’s shares, provided the number of cross-disciplinary shareholders does not exceed the number of shareholders licensed in the PC’s primary profession.6California Legislative Information. California Code CORP 13401.5 – Professional Corporations The permitted combinations are spelled out profession by profession. A medical corporation, for example, may include licensed psychologists, optometrists, chiropractors, physical therapists, and pharmacists as minority shareholders. A psychological corporation may include physicians, nurses, and social workers. Check the subsection that applies to your field before you assume a combination works.
Directors and Officers
General Corporation Law applies to PCs except where Moscone-Knox says otherwise. A single-shareholder PC needs only one director, and that shareholder serves as director as well as president and treasurer. The remaining officer positions in a single-shareholder PC do not need to be filled by licensed individuals. A two-shareholder PC needs two directors (both must be shareholders), and the two of them divide the president, vice president, secretary, and treasurer roles between them.7California Legislative Information. California Corporations Code 13403 – Professional Corporations
Formation: What the PC Process Adds
Setting up a PC looks like setting up a regular corporation, with two differences worth knowing before you compare it to the simpler LLC process.
Articles of Incorporation
The articles must declare the corporation’s status as a professional corporation within the meaning of Section 13400 and identify the single profession the entity will practice. California’s standard PC articles form includes boilerplate language for this purpose.8California Secretary of State. Articles of Incorporation of a Professional Corporation The corporation is limited to that one profession unless the cross-disciplinary rules under Section 13401.5 apply.
Certificate of Registration From Your Licensing Board
This is the step that has no LLC equivalent. Filing articles with the Secretary of State is not enough. Before the PC can lawfully deliver services, it needs a certificate of registration from the state agency that regulates its profession. A medical corporation obtains it from the Medical Board, a law corporation from the State Bar, and so on down the list. Without a current certificate, the PC cannot operate.9California Legislative Information. California Code Corporations Code CORP 13404 – Certificate of Registration If the certificate is later suspended or revoked, the PC must stop rendering services immediately.10California Legislative Information. California Corporations Code 13408 – Grounds for Suspension or Revocation
EIN
Like any corporation, a PC needs an EIN from the IRS. On Form SS-4, you select “Corporation” as the entity type and “Started new business” as the reason for applying.11Internal Revenue Service. Instructions for Form SS-4
Taxes: The PC Isn’t a Dead End for Pass-Through Treatment
One reason business owners reach for the LLC is pass-through taxation. A PC does not foreclose that. By default, the PC is a C corporation for federal purposes and pays a flat 21% corporate tax, with shareholders taxed again on distributions.12Office of the Law Revision Counsel. 26 U.S. Code 11 – Tax Imposed Most PCs can sidestep that double layer by electing S corporation status on IRS Form 2553. Income, losses, and deductions then flow through to shareholders’ personal returns.
To qualify, the PC must be a domestic corporation with no more than 100 shareholders, a single class of stock, and only eligible shareholders (individuals, certain trusts, and estates, not partnerships or other corporations). The election must be filed within two months and 15 days after the start of the tax year it is meant to take effect. Owners who actively work in the business must pay themselves a reasonable salary before taking distributions.
One tax wrinkle to know going in: the IRS generally requires personal service corporations to use a calendar year, so the fiscal-year flexibility an LLC taxed as a partnership might offer is not really on the table.
The Short Version
If your work requires a California license, you cannot use an LLC to deliver it. The Professional Corporation is the available path, it gives you a liability shield for ordinary business debts but not for your own malpractice, and it comes with ownership and officer rules that keep the entity in licensed hands. In exchange for the extra formation step (the licensing board’s certificate of registration) and the ownership restrictions, you get an entity California will actually let you practice through.