🇺🇸Professional Corporation in the USA: Ownership of Licensed Practice

A professional corporation in the USA is a family of state-level organizational-legal forms through which a licensed profession operates as a business: professional corporation (PC), professional service corporation, professional limited liability company (PLLC), professional association (PA), registered limited liability partnership (RLLP), design professional corporation (DPC). Such a company typically has two registrations: the form is registered by the state's secretary of state, and the right to provide the regulated service is issued by the relevant board—in the form of a firm registration, facility licence, certificate of authority, or fictitious-name permit.

There is no federal professional corporation in the USA. Each state decides which profession is permitted to use which form, who may own shares, and who is personally responsible for the work. California, for example, prohibits LLCs from providing professional services in principle—Corporations Code §17701.04(e) explicitly states that nothing in this title permits a domestic or foreign LLC to provide professional services, so California practice operates through a professional corporation, and a neighboring state's PLLC is useless here. The name of the form also says nothing about the tax regime and does not describe the platform around the practice: how an investor and management enter a regulated industry is covered in the article on management services organization for regulated practice.

This page follows the sequence of decisions: three admission tests that are checked before choosing a form; the forms themselves and ownership rules; the figure of the responsible professional; industry-specific regimes from medicine to pharmacy; tax status; transfer of shares, transactions, and financing. At the end—typical failures, scenarios, and the most frequently asked questions.

Three Admission Tests

The "corporation or LLC" dispute is decided last. Before that, three independent checks are performed, and failure of any one makes the structure unsuitable regardless of the outcome of the other two.

Sometimes all three questions are answered by a single professional corporation: licensed physicians own it, manage it, and practice medicine in it. Sometimes an ordinary corporation owns a licensed facility—a pharmacy, clinic, veterinary clinic—but is required to appoint a pharmacist-in-charge or other responsible professional with their own authority. In construction, the license belongs to the company, but each classification requires a living qualifier. Therefore, "professional company" is an analytical category: it unites regimes that differ in structure, and no state issues a document with that name.

Forms of Professional Companies

The name of the form does not determine the result. The same abbreviation PLLC in two states can mean a different list of permitted professions and a different circle of permitted owners. Conversely, the same operational model in different states is implemented through PC, PA, partnership, or licensed facility. The name itself is checked separately: a professional company must carry a professional designation in its name, and operating under a brand different from the corporate name requires permission—in California, a medical practice obtains a fictitious name permit from the Medical Board, without which the sign and website violate advertising rules.

Ownership and Management

Strict regimes require that 100% of shares belong to persons with the required license. Relaxations exist, but are always described in law by a specific number. A California medical corporation may admit psychologists, registered nurses, optometrists, marriage and family therapists, clinical social workers, physician assistants, chiropractors, acupuncturists, naturopaths, clinical counselors, physical therapists, pharmacists, midwives, and occupational therapists as co-owners—but Corporations Code §13401.5 limits their aggregate share to 49 percent and requires that the number of such co-owners not exceed the number of persons with the primary license. A New York design professional corporation operates on symmetrical logic with a different number: Business Corporation Law §1503 as amended by NYSED requires that more than 75% of shares, more than 75% of directors, and more than 75% of officers remain with design professionals, and that the president, chairman, and chief executive officer be licensed professionals; the remaining up to 25% is available to employees without a license.

Legal title and actual control are read separately. A call option to buy shares at par, an irrevocable voting proxy, budget veto right, creditor covenant on hiring approval, or a perpetual management agreement with a prohibitive termination fee give an external party power that the law did not grant them—with a formally impeccable shareholder registry.

⚠️ The regulator reads authority, information, and economics; the shareholder registry is not enough. The Medical Board of California includes in the zone of physician control not only diagnosis, treatment, and referrals, but also medical records, hiring and firing of clinical staff, parameters of contracts with payers, coding and billing, physician workload, and equipment selection. Each of these levers is formally economic, and it is through them that a contract is requalified as prohibited management of practice.

Responsible Professional

Even where an ordinary corporation has the right to own the business, the law usually appoints a natural person who is personally responsible to the regulator. This figure has different names and different content, but one common feature: they must have time, information, access, and authority to fulfill the role established by law.

The CSLB rule is a rare case where the law directly quantified the boundary between real and nominal presence, and the threshold is floating: with a 40-hour company week it equals 32 hours, with a 30-hour week—24 hours, since the lesser of the two is taken. In other industries, the same idea is expressed qualitatively but checked identically: through calendar, correspondence, system access rights, and decision protocols.

Industry Map

Medicine: Company Ownership and Physician Control

California provides the strictest version of the corporate practice of medicine doctrine. The Medical Board's logic is that an artificial entity does not possess professional rights, and a person without a license cannot influence medical judgment. Hence the practical conclusion: a medical corporation that only holds a provider number does not comply with the requirement. A working structure includes:

• permitted shareholders, licensed directors and officers;
• real physician management and the practice's own budget;
• contracts with patients in the name of the practice itself;
• credentialing and clinical supervision;
• storage of medical records and access control;
• quality procedures and complaint handling;
• professional liability insurance.

The investor platform can provide premises, technology, non-clinical staff, finance, and billing support. The distribution of functions between practice and platform is detailed in the article on management services organization for regulated practice, and the application of the same model in consolidation transactions—in the material on AI roll-up.

The form is not portable. A California professional medical corporation, a New York professional service corporation, and a medical PLLC from a third state are three different legal products. Foreign qualification of an ordinary corporation does not fix prohibited ownership, incorrect professional purpose, unlicensed directors, absence of regulator consent, impermissible name, or unregistered facility. Practice in several states is usually built as a "profession × state" matrix with a separate local company in each cell under a common operating platform.

Legal Services: Model Rule 5.4 and Arizona ABS

In most American jurisdictions, ABA Model Rule 5.4 applies: a lawyer does not share fees with an unlicensed person, does not create a partnership with them to provide legal services, and does not permit external management of professional judgment. Therefore, a legal PC or PLLC requires attorney ownership and management according to the rules of the specific state.

Arizona took a different path. As of January 1, 2021, the state repealed its ER 5.4 rule and introduced licensing of Alternative Business Structure—an organization in which persons without a law license have an economic interest or decision-making authority. An ABS is licensed by the state Supreme Court under Rule 31.1 and ACJA §7-209, must appoint a compliance lawyer responsible for rule compliance, and must disclose in the application the practice areas, attorney-owners, beneficial owners with 25% or more, contributions, and identities of unlicensed investors. This is an independent licensing route that cannot be replicated by contract to an ordinary PLLC in another state.

Designing a legal group separately answers the questions of who acts as the client-facing firm, who signs the engagement letter, where conflict checks are conducted, who stores privileged files, where client accounts are located, how fees and referral compensation are distributed, who supervises legal work, and what of this is visible to a platform employee without attorney status. The standard set of documents for such a group is covered in corporate documents.

Audit: Attest Firm and Alternative Practice Structure

CPA firm rules combine state ownership requirements, individual licenses, the right to attest work, and independence. External capital enters through an alternative practice structure: investments go to a non-audit company, while the attest practice remains in a separate professional firm and receives administrative services under a comprehensive agreement. The PCAOB maintains a special interpretation on the impact of such structures on independence in ET Section 101.

Legal separation alone does not create independence. Six groups of decisions are subject to review.

The gap between legal scheme and operational reality here costs more than in most other professions: it calls into question all issued audit opinions.

Design and Construction

Design professions often require both a professional form and firm registration. A New York DPC demonstrates two principles at once: external ownership is possible only because the law specifically permitted it with a specific percentage, and permitted minority economics do not cancel professional management and responsible charge. In other states, a design bureau can operate as an ordinary corporation with a firm permit or as a strictly professional PC or PLLC. The following are subject to review:

• list of professions in the charter purpose;
• firm certificate in each state of work performance;
• appointed responsible architect or engineer;
• procedure for applying seals and signatures;
• delegated design and subcontracting;
• branches and additional offices;
• fate of ownership after transaction;
• storage of design records.

Construction is structured differently. The company receives the license, but each classification is qualified by a specific person: California CSLB distinguishes Responsible Managing Officer, Member, Manager, and Employee, and a quantitative employment threshold is set for RME. For a group, this means that the license does not automatically follow the sale of assets, a change in organizational-legal form may require a new application, departure of a qualifier requires timely replacement, the classification matrix must match actual projects, and a central estimating department does not replace on-site supervision.

Pharmacy and Veterinary Medicine

The pharmacy regime is built on a facility license. The California Board of Pharmacy permits a pharmacy license for a natural person, partnership, corporation, LLC, trust, and other listed owners, but each pharmacy must have a pharmacist-in-charge responsible for daily operations. The structure fundamentally differs from a medical corporation: corporate ownership is permitted here, the premises itself is licensed, and the PIC and staff bear personal professional duties. Change of owner, address, or PIC requires separate filings. A retail or online platform has the right to centralize procurement, logistics, customer support, and IT, but has no right to deprive the PIC of authority over drug dispensing, shift staffing, and records.

Veterinary medicine combines several regulated subjects at once:

• ownership of a professional company and individual veterinarian licenses;
• clinic premises registration;
• veterinarian-client-patient relationship;
• prescription writing and handling of controlled substances;
• maintenance of medical records;
• delegation to technicians and assistants;
• emergency care and continuity of treatment obligations.

A group can buy non-special assets and a brand, but the local practice must remain a real licensed operator with its own succession plan in case of loss of owner's license, shortage of veterinarians, or revocation of premises permit.

Tax Status

State form and tax regime are chosen independently. A professional corporation is taxed as a C corporation by default, can elect S corporation status if it meets requirements for number and type of shareholders; a PLLC uses general check-the-box rules. Hence the most common terminology error: PC is a state form, S corporation is a federal tax status, and one does not replace the other.

The actual tax consequences of professional status come down to three rules. IRC §448(d)(2) defines a qualified personal service corporation through two tests: services in the fields of health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting, and ownership of substantially all stock by employees performing these services, former employees, their heirs, and their estates. Such a corporation retains the right to the cash method of accounting regardless of revenue.

There has been no separate higher rate for personal service corporations since 2018: IRC §11 after the 2017 tax reform establishes a uniform corporate tax rate of 21% and does not single out professional corporations. The flat 35% that used to scare professional practices was abolished along with the old corporate bracket.

The third rule works against professions. IRC §199A gives owners of pass-through structures a deduction of up to 20% of qualified income, but classifies health care, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage as specified service trades / businesses (SSTB), for which the deduction is phased out when the taxable income threshold is exceeded. The threshold is indexed annually: for 2025, Rev. Proc. 2024-40, §2.27 sets $197,300 for a single return and $394,600 for a joint return. Architecture and engineering are explicitly excluded from the SSTB list and retain the deduction. For tax periods beginning after December 31, 2025, H.R. 1, P.L. 119-21 expanded the phase-out range from $50,000 to $75,000 for a single return and from $100,000 to $150,000 for a joint return, which softens the cliff in the middle income zone.

Transfer of Shares, Death, and Loss of License

Shares in a professional company do not trade like ordinary stock. An event that in an ordinary corporation generates a dispute about price, here generates a question about the legality of ownership itself.

A buy-sell agreement, trust, power of attorney, or option that is impeccable in one profession creates prohibited control in another. Particularly sensitive is a unilateral call option by the platform on professional shares: the right to buy a share at any time at a fixed price is economically equivalent to ownership, and the regulator reads it exactly that way.

Transactions and Financing

Purchase of Shares

The buyer checks whether they themselves have the right to become an owner, whether approval of indirect owners is required, and whether the target company retains a valid form. Change of control can trigger regulator consent, notification, re-registration with payers, client consent, or loss of professional status. In medicine, notification of a transaction in a number of states is filed in advance and covers, among other things, contracts with a management organization.

Purchase of Assets

Assets do not carry licenses. Each element is transferred or created anew by a separate procedure:

• Permits—firm registration, facility license, accreditations.
• Contracts—professional contracts, relationships with payers and panels, lease and equipment.
• People—employment relationships with responsible professionals.
• Intangibles—trade names, client and professional records.
• Risk—professional liability insurance policies and loss history.

A construction license does not transfer at all in an asset sale—the buyer needs their own application with their own qualifier.

Purchase of Platform Only

Acquisition of a service company can shift actual control over the practice or create a reportable affiliation. After such a transaction, the professional company's contracts, ownership succession mechanism, and degree of economic dependence on the platform are re-examined.

⚠️ A creditor does not receive ordinary means of protection through a pledge of professional shares. Foreclosure will transfer the share to a person without a license, which is prohibited, so the pledge is either unenforceable or requires regulator approval and a pre-selected permitted acquirer. Debt is usually placed above or alongside the practice, but even then upstream cash flows and guarantees must leave the licensed company solvent and staffed.

Technology and Professional Responsibility

A professional company has the right to license software and use a group AI platform. Responsibility remains with it, so decisions about using the model are made by it.

The model does not sign a document, does not affix a seal, does not write a prescription, does not make a diagnosis, does not certify an audit opinion, does not give final legal advice, and does not assume responsible charge just because its output passed through a licensed company. The professional company must be able to explain its own decision and support it with records—this requirement existed before the advent of generative models and has not changed with them.

Typical Mistakes

Scenarios

Clinic in California with External Investor

Practice is conducted through a professional medical corporation with a physician-owner; psychologists and physical therapists are admitted to capital within 49 percent and with a number limitation. The investor owns the platform, which holds premises, non-clinical staff, billing, and technology.

Key risk: requalification under the corporate practice of medicine doctrine through control over records, contracts with payers, and physician workload.

Design Bureau in New York

An architecture-engineering firm operates as a design professional corporation: more than 75 percent of shares, directors, and officers are licensed design professionals, the remaining share is distributed among employees without a license and an employee stock ownership plan (ESOP), president and CEO are licensed.

Key risk: dilution in a new issuance or partner departure drops the professional share below the threshold and deprives the company of the right to operate.

Construction Roll-up

The group buys contractors directly, licenses remain with the acquired companies, each classification is assigned to a specific qualifier. Estimating, procurement, fleet, and finance are centralized.

Key risk: departure of RME or their formal employment stops the license, and purchase of assets instead of shares zeros out the admission and requires a new application.