LLC vs. S-Corp for Private Practice: What Actually Changes

"Should I be an LLC or an S-corp?" is the question I hear most often, and it is a bit like asking whether you should own a car or have insurance. They are not competing options. They answer different questions, they are filed with different agencies, and you can absolutely have both.

Two different questions, two different agencies

An LLC is a legal entity. You create it by filing formation documents with a state, usually called articles of organization, paying a state fee, naming a registered agent and adopting an operating agreement. The state now recognizes your practice as something separate from you personally.

S corporation is a federal tax classification. You obtain it by filing Form 2553 with the IRS, telling them how you would like an entity that already exists to be taxed. There is no such thing as "forming an S-corp" at the state level. There is an entity, and there is how that entity is taxed.

Which means the sentence "I want to be an S-corp instead of an LLC" is, on inspection, not a sentence. In most private practices the accurate version is: I have an LLC, and I am deciding whether to have it taxed as an S corporation.

What an LLC actually gives you

Three things, and they are worth having:

• A liability shield for business obligations. If the practice signs a lease, takes a loan, hires staff or gets sued over a business dispute, the claim is generally against the entity rather than against your house.
• A legal identity. A name, an EIN, contracts, bank accounts, payer agreements and staff who work for a company rather than for you personally.
• A structure for partners. If you own the practice with someone, the operating agreement is where ownership, decision rights, capital and exit terms live.

What an LLC does not give you is any change in federal income tax. None. Which brings us to the part people find surprising.

What an LLC does not protect you from

This matters more for clinicians than for almost any other business owner. An LLC does not shield you from personal liability for your own professional negligence. If a malpractice claim is brought over care you personally provided, you are personally exposed regardless of how the entity is organized. Your professional liability insurance is the protection there. The entity is not.

An LLC also will not protect you from:

• Debts you personally guarantee, most small-practice leases and loans
• Unpaid payroll taxes, which the IRS can and does assess against responsible individuals personally
• Your own fraudulent or intentionally wrongful acts
• Claims where a court decides to look through the entity because you never really treated it as one

That last one is entirely within your control. Commingling personal and business money, paying household bills from the practice account, keeping no records and skipping the operating agreement are exactly how a liability shield becomes decorative.

The entity protects the business from your business risks. The insurance protects you from your clinical risks. Neither one substitutes for the other. What I say when someone asks if an LLC replaces malpractice coverage

Why licensed clinicians often need a PLLC, not an LLC

Most states have a separate track for licensed professionals. Instead of a plain LLC you form a professional limited liability company (PLLC) or a professional corporation (PC), and the rules are stricter:

• Ownership is generally restricted to individuals licensed in the profession, which can complicate bringing in a non-clinician business partner or spouse.
• Several states require approval from the licensing board before the formation filing. In New York, for example, a PLLC application goes through the Education Department first, and only then to the Department of State.
• A few states do not permit LLCs for licensed professional services at all. California is the significant one: clinicians there generally use a professional corporation.

Forming a plain LLC when your state requires a professional entity is a fixable mistake, but fixing it costs time, filing fees and sometimes a re-credentialing cycle with payers. Check your board's rules, or have someone check them, before you file anything.

The default tax treatment, before any election

Once the entity exists, the IRS assigns it a default classification:

Look at the first two rows. A solo therapist who forms a single-member PLLC files exactly the same tax return, pays exactly the same income tax and exactly the same self-employment tax as she did the day before. The entity changed. The tax did not.

That is not an argument against forming one, the liability shield, the contracts and the professional legitimacy are real. It is an argument against forming one expecting a tax result.

Where the S-corp election fits

The tax change comes from the election. File Form 2553 and the same LLC or PLLC starts being taxed as an S corporation: you go on payroll, take a reasonable W-2 salary, and the profit left over passes to you on a K-1 without the 15.3% payroll-tax layer.

Legally, nothing moves. Your PLLC is still a PLLC. Your operating agreement still governs. Your license, your lease and your malpractice policy are untouched. Only the tax return changes, and the compliance that comes with running payroll.

Whether that trade is worth making is a separate, arithmetic question, and I have written it out in detail in Should Your Therapy Practice Elect S-Corp Status? The short version: it depends on how much profit sits above a salary you could defend, and on what your state does with S corporations.

The usual path, in order

Most practices we work with move through these stages, and the order matters:

1. Sole proprietor. You start seeing clients. Income on Schedule C, no state filing, minimal cost, no liability shield.
2. PLLC or PC. Usually triggered by a real event, signing a lease, hiring, joining panels, or simply reaching the point where personal exposure feels uncomfortable. Same tax, new legal protection.
3. S-corp election. Made when profit is high enough that the payroll-tax saving clearly outruns the cost of payroll, an extra return and tighter books.

You can compress the steps, a new practice can form a PLLC and elect S status from day one, but be honest about whether step three is earning its keep. Running payroll for a practice with $40,000 of profit is an expense with no offsetting benefit.

State filing, fees and the New York surprise

Forming the entity is not a one-time cost. Budget for the annual and biennial obligations too: a registered agent, an annual or biennial report, and in many states a franchise tax or entity fee, California's $800 annual minimum being the best-known example.

New York deserves its own warning. New York LLCs and PLLCs must satisfy a publication requirement: notice of formation published in two newspapers designated by the county clerk, for six consecutive weeks, followed by a certificate of publication filed with the state. In the downstate counties the newspaper cost can dwarf the filing fee itself. It catches new practice owners every year.

Federal beneficial-ownership reporting has also moved around considerably since it was introduced. Confirm the current requirement at the time you form rather than relying on anything written earlier, including this paragraph.

The practical fallout: EIN, W-9s, panels and credentialing

This is the part that gets underestimated, and for an insurance-based practice it is the part that can actually cost you money. Changing your legal entity means changing the entity that bills:

• A new EIN for the entity, and a bank account in the entity's exact legal name
• An updated Form W-9 to every payer, EAP, contract site and referral source that pays you
• An organizational NPI, and updates to CAQH and each payer's provider file
• Re-contracting or re-credentialing with panels, which some payers treat as a new application rather than an update
• Malpractice and business policies re-issued in the entity's name
• Your EHR's billing profile, superbill templates and merchant account updated to match

Payers do not always process these changes quickly, and claims submitted under a tax ID that does not match their file get denied. Plan the switch for a quiet period, notify each payer in advance, and confirm the effective date in writing before you start billing under the new entity. A January 1 changeover with paperwork submitted in November is far less painful than a mid-quarter scramble.

A short decision guide

If you are solo, early, and profit is modest: stay simple, keep clean books, carry good malpractice coverage, and revisit the entity once you have a lease, staff or real profit.

If you have contracts, employees, a physical office or meaningful profit: form the professional entity your state requires, and treat it properly, separate accounts, separate records, its own name on everything.

If profit is comfortably above a defensible salary: model the S election with real numbers, including your state and city, before you file anything.

This is general information rather than advice about your practice, and the entity rules that matter most here are set state by state. Please confirm the specifics with your own CPA and, where ownership or licensing is involved, an attorney. If you want help sequencing it, business formation and entity structuring is one of the things we do most, and the S Corp Strategy Report is how you find out whether step three is even on your horizon.