LLC vs. S-Corp for a Medical Weight Loss Clinic: The Breakeven Math

The question gets asked as “LLC or S-corp,” and the framing is the first problem: they are not the same category of thing.

An LLC is a legal entity formed under state law. An S-corp is a federal tax election. An LLC can be taxed as a sole proprietorship, a partnership, an S-corp, or a C-corp — so the real question for nearly every clinic owner is not which to choose, but whether the entity that already exists should elect S-corp treatment. The LLC’s liability protection does not change either way.

What the Election Actually Changes

Without the election, the clinic’s net earnings are generally subject to self-employment tax — 15.3% up to the annual wage base and 2.9% above it, plus the additional Medicare tax at higher income — on top of income tax.

With the election, the owner takes a reasonable W-2 salary subject to payroll taxes, and the remaining profit passes through as distributions not subject to those taxes.

The income tax on the total is broadly similar. The savings live entirely in the employment tax layer, and only on the distribution portion.

That last clause is the one that decides the math: the election saves nothing on profit that a defensible salary would have absorbed anyway. A clinic netting $120,000 where the owner works full-time clinically and administratively may find that a defensible salary is most of that $120,000, leaving little to distribute — and the election produces cost without benefit.

The Real Breakeven

Three inputs determine it:

The defensible salary. The lower the supportable salary relative to net income, the more profit is available to distribute, and the larger the savings. In a clinic where much of the revenue comes from medication margin and other providers rather than the owner’s own hands, that gap is often wider than in a purely service-based practice — which is a genuine structural feature of this business model, not a loophole.

The maintenance cost. Payroll processing, a separate 1120-S, and state-level fees. In some states these are trivial; in others the annual franchise or entity-level tax is large enough to move the threshold by tens of thousands of dollars of income.

Consistency. The election is worth making when income is durable. A clinic that clears the threshold in one strong year and falls below it the next has taken on permanent administrative cost for an intermittent benefit.

The commonly cited range — around $150,000 of consistent net income — is a reasonable starting point for the conversation, not an answer. It moves with all three inputs.

Free tool: S-Corp vs. LLC Analyzer · S-Corp Salary Optimizer

The Complication Specific to Clinics

Most articles on this topic are written for generic small businesses and skip the thing that matters most here: who is allowed to own the practice.

State professional-practice rules govern ownership of clinical entities, and they vary considerably. Clinics with a non-physician owner — common in medical weight loss, where the business operator and the supervising or collaborating clinician are frequently different people — often operate through a management-services or similar structure designed to satisfy those rules.

Those structures have real tax consequences: which entity earns what, how the management fee is set, where the deductions sit, and which entity the S-corp election even applies to.

The sequencing matters. The legal structure comes first, and the tax analysis follows it. A clinic that makes an election and then discovers the ownership arrangement needed to be different has done the work in the wrong order, and unwinding it is considerably more expensive than getting counsel involved at the start.

The Obligation People Underestimate

The election is a form. The salary is a continuing obligation.

Reasonable compensation is a facts-and-circumstances standard: what the clinic would pay someone else to do the work the owner actually does. For most clinic owners that is a blend — clinical time, administrative management, and sales — rather than a single benchmarkable role.

Two things follow:

There is no percentage. The 60/40 rule of thumb that circulates widely appears nowhere in the code or the regulations. It is not a safe harbor and will not defend an examination on its own.

It has to be revisited. A salary set when the clinic had one provider and $200,000 of revenue is not automatically defensible three years later at four times the size with the owner’s role changed. Officer compensation that never moves while distributions grow is a visible pattern on the return.

Go deeper: Reasonable Compensation for a Practice S-Corp

If the Election Makes Sense, When Should It Happen?

Elections have their own deadlines, and relief for a late election exists where the entity intended S-corp treatment from the requested date and missed the filing solely through oversight — with conditions that have to be met precisely. It is common enough to be routine and specific enough to confirm rather than assume.

The more useful timing point is operational: the election brings payroll with it, and payroll for a closed year cannot be reconstructed. A clinic deciding in the fall has runway to set up payroll and run a defensible salary before year end. The same decision in late December does not.

Related: The Tax & Accounting Guide for Medical Weight Loss Clinics · What a CPA Costs for a Medical Weight Loss Clinic · Tax Deadlines for Practice Owners

This article describes general federal tax principles and is not tax or legal advice for a specific clinic. Ownership of clinical practices is governed by state law and varies considerably; structure questions should be reviewed with counsel licensed in your state.