When “APC” appears after a law firm’s name, it stands for “A Professional Corporation.” It signals that the firm is organized under its state’s professional corporation statute rather than as a general business corporation, partnership, or sole proprietorship. California law firms use the suffix especially often, but the underlying entity exists in some form in every state.
What APC Stands For
The letters are a naming suffix, not a separate kind of entity. A firm styled “Smith & Jones, APC” is a professional corporation whose shareholders are licensed attorneys. States require professional corporations to flag their status in the business name so clients and the public can tell the entity apart from an ordinary corporation. The permitted suffix depends on the state and the profession: you’ll also see “P.C.,” “P.A.” (Professional Association), and “P.S.C.” (Professional Service Corporation) doing the same work.
“Professional corporation,” “professional service corporation,” and “professional association” all describe the same basic concept: a corporate entity restricted to licensed professionals and governed by a dedicated state statute. The exact label is a matter of state law and local convention.
Why Law Firms Use the APC Designation
A law firm cannot simply incorporate as a standard business corporation. The practice of law is restricted to licensed attorneys, and states have built a parallel corporate framework so that attorneys who want the structure and tax features of a corporation can get them without opening the door to non-lawyer ownership. The APC suffix is how the firm tells the state, the bar, and the public that it has used that framework.
The name requirement is not optional. If a firm fails to include the required designation, it may be out of compliance with both the secretary of state’s filing rules and the state bar’s rules on law firm names.
What the Corporate Form Does and Doesn’t Protect
This is where professional corporations diverge most sharply from ordinary corporations, and where misunderstandings are most expensive. An APC does shield its owners from general business debts. If the firm takes out a loan or faces a breach-of-contract claim from a vendor, the shareholders’ personal assets are normally off-limits. That part works like any corporation.
What an APC does not do is protect an attorney from their own malpractice. If you commit professional negligence, incorporating as an APC will not stop the injured client from pursuing your personal assets. Most states go further: you can also be held personally liable for the malpractice of anyone you directly supervise. A senior partner who oversees an associate’s work may share personal exposure for that associate’s errors. The corporate form is not a malpractice shield, and treating it as one is a serious mistake.
The practical upside is that one partner’s malpractice usually cannot reach another partner’s personal assets when those partners did not supervise or participate in the negligent work. In a general partnership without a corporate wrapper, every partner’s personal wealth could be exposed. That distinction is the real liability advantage of the APC structure.
Who Can Own Shares in an APC
An APC’s shares can only be held by individuals licensed in the same profession. For a law firm, that means every shareholder must be a licensed attorney, and in most states, every director and officer must be as well. You cannot bring in a passive investor, an unlicensed family member, or an outside firm as a shareholder.
These restrictions create a problem when a shareholder dies, loses their license to practice, or becomes incapacitated. Since an unlicensed person cannot hold the shares, the corporation must buy back or transfer them within a window set by state law. If the parties cannot agree on a price, courts can be asked to determine fair value.
Because of these forced-transfer rules, most APCs adopt buy-sell agreements at formation. A buy-sell agreement locks in a valuation method and a funding mechanism, often life insurance on each shareholder, so the transition happens smoothly rather than in a courtroom. Skipping this step is one of the most common and costly oversights in APC planning.
APC vs. PLLC
A Professional Limited Liability Company is the other main entity option for licensed attorneys in states that allow it. Both structures restrict ownership to licensed individuals, and both preserve personal liability for malpractice. The differences are mostly about governance and formality.
- Governance: an APC has shareholders, directors, and officers, much like a traditional corporation. A PLLC has members and, optionally, managers. The PLLC structure is generally less rigid.
- Ongoing formalities: an APC must issue shares, adopt bylaws, hold regular meetings, elect directors, and file annual reports. A PLLC typically adopts an operating agreement instead of bylaws, and most states do not require formal meetings.
- Tax flexibility: a PLLC can choose how it’s taxed. An APC is taxed as a C corporation by default and must affirmatively elect S corporation status to get pass-through treatment.
- Availability: not every state offers the PLLC option for law firms. Some bars only authorize professional corporations, while others accept either form.
The trend over the past two decades has been toward PLLCs because of their flexibility, but plenty of attorneys still prefer or are required to use the APC structure. The choice sometimes comes down to what the state bar mandates rather than what the owners would prefer.
How APCs Are Taxed
By default, a professional corporation is taxed as a C corporation. The corporation pays federal income tax at the flat 21 percent rate on its taxable income, and shareholders pay tax again when they receive that income as dividends or distributions.1Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed This double layer of tax is the main disadvantage of C corporation status.
In practice, many small firms minimize double taxation by paying out most of the corporation’s earnings as salary and bonuses to the owner-attorneys. Salary is a deductible expense for the corporation, so it reduces or eliminates the corporate-level tax. The IRS watches this closely, and compensation must be reasonable for the services performed.
An APC can also elect S corporation status by filing Form 2553 with the IRS, provided it meets the eligibility rules: no more than 100 shareholders, only individual U.S. resident or citizen shareholders, and a single class of stock.2Office of the Law Revision Counsel. 26 U.S. Code 1361 – S Corporation Defined Professional corporations are not listed among the ineligible corporation types, so they qualify as long as these general rules are met. The election must be filed no later than two months and 15 days after the beginning of the tax year in which it is to take effect. With S status, income passes through to shareholders’ personal returns and is taxed only once, which is why most small APCs make the election.