LLC, PLLC or Sole Proprietor for a US Dietitian? The License Does Not Decide

How is a sole-proprietor dietitian taxed?

On Schedule C of the personal return, with self-employment tax on top. The IRS describes a sole proprietorship as a business that "has no existence apart from you, the owner", whose liabilities "are your personal liabilities". Net profit goes on Form 1040 and is subject to self-employment tax at 15.3 percent, which is 12.4 percent for Social Security and 2.9 percent for Medicare. The tax is computed on 92.35 percent of net profit, a figure printed on the face of Schedule SE, and it is owed once net earnings reach $400. Only the first $176,100 of combined wages and self-employment earnings in 2025 is subject to the 12.4 percent portion, and a practitioner with a salaried job has that job's Social Security wages netted off first, so the Social Security portion is not paid twice. Half of the self-employment tax is deducted on the return.

Estimated tax is owed quarterly once the practice expects to owe $1,000 or more after withholding and credits, unless withholding and credits will cover the smaller of 90 percent of this year's tax or 100 percent of last year's. That 100 percent becomes 110 percent once prior-year adjusted gross income passes $150,000. Payments for 2026 income fall on April 15, June 15 and September 15, 2026, and January 15, 2027, on Form 1040-ES. A sole proprietor with no employees and no excise or pension returns needs no employer identification number and may use a Social Security number, though one is issued online immediately if wanted. A married couple who jointly own and run the practice are a partnership by default and file Form 1065, not Schedule C, unless a community-property or qualified-joint-venture exception applies.

Does forming an LLC save a dietitian any tax?

No, on its own. The IRS treats an LLC with one member as "an entity disregarded as separate from its owner" for income tax unless it elects otherwise, so the owner still files Schedule C and still pays self-employment tax on the same base. The classification rules sit in the check-the-box regulations, not in any state's LLC act. What the LLC changes is liability and, in some states, which credentials the practice needs to file. For payroll tax the LLC is not disregarded: once it has employees it uses its own name and employer identification number for employment-tax returns.

The tax saving people associate with an LLC comes from a separate step, the S corporation election. An LLC or corporation eligible to be treated as a corporation makes the election on Form 2553, no more than two months and fifteen days after the start of the tax year it is to take effect, or at any time in the preceding year. An LLC electing S status does not also file the entity-classification form. Late elections have a relief route the form itself is annotated for. An S corporation generally pays no federal income tax itself, and shareholders report their share. The IRS requires that "S corporations must pay reasonable compensation to a shareholder-employee in return for services that the employee provides to the corporation before non-wage distributions may be made", will recharacterize distributions as wages to the extent they are reasonable compensation, and publishes no safe-harbor percentage. Its page lists factors courts weigh and cites cases, not a formula. Any "pay yourself 40 percent" figure has no IRS source behind it. A C corporation pays a flat 21 percent and its dividends are taxed again to the shareholder.

An LLC can also obtain its own Type 2 NPI. CMS states that an individual who is incorporated, including as an LLC, “can obtain an NPI for themselves (Type 1) and an NPI for their corporation or LLC (Type 2)”, whereas an unincorporated sole proprietor holds a single Type 1 NPI applied for with a Social Security number even if they have an EIN. The superbill page sets out which NPI and tax ID go on a client’s superbill.

Can a dietitian form a regular LLC, or does it have to be a PLLC?

It depends on the state's professional-entity statute, and the answer does not follow from whether the state licenses dietitians. Every state examined defines "professional service" by some version of a service that requires a license "as a condition precedent" to rendering it. Three things then vary: whether the definition is a closed list of professions or a generic test; whether the state's dietitian credential actually conditions the service or only the title; and whether the professional form is mandatory or elective once the definition is met.

The closed-list states are where the license and the entity statute diverge. Ohio licenses dietitians through the State Medical Board, but its professional-association statute enumerates the licensing chapters it covers and the dietetics chapter is not among them, so a licensed Ohio dietitian cannot form a professional association and uses an ordinary LLC, for which Ohio has no professional variant. Georgia licenses dietitians and its Secretary of State quotes a professional-corporation list of sixteen professions that does not include dietetics, so the election is unavailable and an ordinary entity is the form. North Carolina is the starkest: its professional-corporation act lists the licensing articles it reaches, was amended as recently as 2019 to add counselors, and still omits the dietetics article, so a licensed North Carolina dietitian is outside the professional-entity regime and, read literally, may not use “PLLC” in a name. Pennsylvania splits the difference: a licensed dietitian-nutritionist is a “profession” for its professional-corporation chapter but dietetics is not among the ten “restricted professional services” that trigger its LLC-side regime, so an ordinary LLC is available and a professional corporation is optional. Virginia’s professional-entity lists are closed and omit dietitians, and Virginia issues no license anyway. Which category each state’s license falls into is set out in licensure and protected titles by state.

The generic-test states turn on what the credential conditions. Texas licenses dietitians, but the license protects only the title, so the "condition precedent to the rendering of the service" test in its Business Organizations Code is arguably unmet and an ordinary LLC is the plausible form. No Texas agency has said so, and this is a reading of the statute. Florida's license is a condition of practicing for remuneration, so dietetics is a professional service there, but its professional-entity chapter says licensees "may" organize under it and no Florida statute says they must. Whether the ordinary LLC remains open in Florida is unresolved on the face of the text. Illinois licenses the practice and its professional-LLC act is generic, so a dietitian is squarely inside it. An ordinary LLC is not the clean path there, because a professional LLC must hold a certificate of registration from the licensing department for each location and the act offers a free conversion route for an LLC that should have been professional. Washington certifies rather than licenses, which would ordinarily put dietitians outside the regime, but its professional-corporation act expressly lists the dietitian chapter among the credentials whose holders may organize one, so the professional form is permitted and not compelled.

California is unresolved. Its LLC act states that "nothing in this title shall be construed to permit a domestic or foreign limited liability company to render professional services", and defines those as services "that may be lawfully rendered only pursuant to a license, certification, or registration authorized by the Business and Professions Code". The dietitian chapter sits inside that code, but it creates no board, issues no credential and lets anyone give nutritional advice, while making it a misdemeanor to use "registered dietitian" or "RD" without CDR-equivalent qualifications and gating medical nutrition therapy on a referral. On one reading RD services are not rendered "only pursuant to" a state credential and an LLC is fine. On the other, the chapter's "registration" language brings them inside the bar, and since the professional-corporation act requires a "licensed person", a California RD might be able to use neither an LLC nor a professional corporation. No Secretary of State determination, department statement or attorney general opinion resolves it, and the Secretary of State's own guidance tells filers to consult "the appropriate licensing authority", which for a California RD does not exist.

Does the licensing board have to approve a dietitian's LLC?

In New York, yes, and before the filing. Because dietetics and nutrition is a Title VIII profession, a professional service LLC's articles must have attached "a certificate or certificates issued by the licensing authority" that each member is authorized to practice, and the State Education Department states that "you must obtain a Certificate of Authority from the Office of the Professions", on a form applied for by mail, and "submit both the Certificate of Authority and Articles of Organization to the Department of State". The same applies to a professional corporation. The name may end in "Professional Limited Liability Company" or plain "Limited Liability Company", "PLLC" or "LLC", provided it describes the profession and is not misleading.

Illinois requires the certificate after formation rather than before: a professional LLC "shall not open, operate, or maintain an establishment" without a certificate of registration from the Department of Financial and Professional Regulation, one application per Illinois location, renewed every three years and posted on the premises. Massachusetts requires an LLC "organized to render a professional service" to include with its certificate of organization a compliance certificate from the regulating board, and subjects it to board conditions including liability insurance. Whether a licensed dietitian-nutritionist's LLC is such an LLC depends on whether the board permits incorporation or the licensee elects it, and the board publishes no procedure, so the point is unsettled. Nowhere else among the sixteen states does a dietitian's entity need board notification or approval, and in California, Virginia, Arizona and Colorado there is no board to notify.

What must a dietitian's LLC be called?

The ordinary designator everywhere, and a professional one only where the professional form is used and the state mandates it. Illinois requires "professional limited liability company", "P.L.L.C." or "PLLC" on a professional LLC. Texas requires the phrase or an abbreviation on a PLLC and separately subjects any professional entity's name to the profession's own rules, which for a dietitian means the title restrictions on "licensed dietitian" and "LD". Florida requires "chartered", "professional association", "P.A." or, for a PLLC formed since 2014, "PLLC" in place of the ordinary designator. Michigan requires "professional limited liability company", "P.L.L.C." or, uniquely, "P.L.C." on a PLLC.

Four states go the other way. Virginia makes "PLLC" and "P.C." optional even for a professional entity. Pennsylvania has no "PLLC" designator at all, and a restricted professional company discloses its status in its certificate of organization instead. Colorado permits "PLLC" only to entities that some other law specifically authorizes to call themselves professional, which excludes a dietitian, so a Colorado dietitian's LLC uses the ordinary designator. And in North Carolina the mandatory professional designator applies only to an LLC rendering a listed professional service, which a dietitian's is not.

Canada has no LLC. The professional corporation is available to dietitians in four provinces only, and the question there is whether the college will issue a permit at all. See whether a Canadian dietitian can incorporate. Whether the practice’s fees attract sales or gross-receipts tax is a separate state question: see do dietitians charge sales tax in the US. The other decisions that change by state are mapped in starting a dietitian private practice in the US.