How do I know which model my group uses?

Three documents answer it: the operating or partnership agreement (or shareholder agreement), your offer letter's description of how you are paid, and last year's tax paperwork for a current partner, W-2, K-1, or both. The entity's name is a clue but not an answer; LLC and PC labels do not reliably predict the tax treatment.

Why does the model matter for taxes?

It decides whether you face self-employment tax and quarterly estimates, whether benefits are pre-tax or self-employed, how retirement plans are structured, whether QBI is even in play, and what happens at a sale. Two physicians with identical clinical income can have meaningfully different tax lives purely because of the model.

What is rollover equity in a private equity medical deal?

When a platform buys a practice, selling physicians typically take part of the price in equity of the buyer's holding company, usually an LLC taxed as a partnership. That stake generates its own K-1, often small income year to year, with the real tax event arriving when the platform sells again. Clinical compensation usually continues separately as W-2 wages.

Is a professional corporation shareholder taxed like a partner?

No. A physician who owns shares in a professional corporation is an employee-shareholder: wages on a W-2, payroll tax handled through the corporation, benefits on an employee basis. No K-1 arrives from the corporation itself unless it elected S status, and no self-employment tax applies to the wages.

Can one physician end up with both a W-2 and a K-1 from the same job?

Yes, and it is increasingly common: W-2 clinical wages from the employer entity plus a K-1 from an equity holding company, or W-2 wages from a hospital alongside a K-1 from a call-coverage or ancillary joint venture. Each piece follows its own rules, and the combination changes wage-base and estimate math.

Physician Partnership Guide

Medical Group Ownership Models

Partnership, professional corporation, PE platform, MSO, or employment: the model your group chose decades ago decides what your tax life looks like today.

A guide by Taxstra Tax & Accounting · CPA-led tax strategy for business owners

Your Guide

01The Five Models 02The Tax Profile of Each 03What to Check Before You Sign 04Frequently Asked Questions

K-1 & Partnership Taxes>Ownership Models

Written by Bryan Martin, CPA, Managing Partner and Founder of Taxstra. Last updated August 20, 2026.

Quick answer

Medical groups organize five main ways: true partnerships that issue K-1s for everything, professional corporations that pay shareholder physicians on W-2s, private equity platforms pairing W-2 clinical pay with rollover-equity K-1s, MSO-affiliated practices that remain partnerships, and direct employment. The model determines self-employment tax, estimates, benefits, and what a sale means.

Two anesthesiologists with identical skills and identical $500,000 incomes can live completely different tax lives. One gets a W-2, pre-tax benefits, and an April refund. The other gets a K-1, four estimate deadlines, self-employment tax, and a set of deductions the first one cannot touch. The difference is not the medicine. It is the ownership model of the group.

This guide is the taxonomy: the five recurring models, the tax profile of each, and the document checklist that tells you which one an offer actually is, because titles and entity names routinely mislead.

The Five Models

Almost every physician offer is one of these.

1. True partnership or LLP

Physicians are partners; the group files Form 1065 and every partner receives a K-1 for their full share, clinical income included. Common in physician-owned emergency medicine, anesthesia, radiology, and many independent single-specialty groups. Guaranteed-payment bases with profit true-ups are typical.

2. Professional corporation with physician shareholders

Physicians buy shares in a professional corporation and remain employees of it: W-2 wages, payroll tax, employee-basis benefits. Ownership shows up as governance rights and eventual share value rather than a K-1. Some large multispecialty medical groups use exactly this structure, which is why "partner" status there does not produce partnership taxation.

3. Private equity platform with rollover equity

Clinical work is paid on a W-2 from the platform's employer entity, while physicians hold units in a holding-company LLC taxed as a partnership. The equity issues its own K-1, often modest until the platform trades again. The paycheck feels like employment; the equity behaves like a partnership investment.

4. MSO-affiliated independent practice

The practice joins a management network that handles billing, contracting, and back office, but the practice entity itself stays physician-owned, frequently a partnership. Partners keep receiving practice-level K-1s; the network relationship changes economics, not the tax model.

5. Direct employment

Hospitals, health systems, academic centers, government, and most large staffing companies: W-2 wages, no ownership, no K-1. The baseline everything else is compared against.

The label on the door is not the model

Groups called "partners" can be corporations; LLCs can be taxed as partnerships or have elected S status; a platform can run different models in different states, and some organizations use different structures for different regions or cohorts. The tax paperwork a current physician actually receives is the only reliable identifier.

The Tax Profile of Each

One table, five tax lives.

Model	Forms you get	SE tax	Estimates	Benefits
True partnership	K-1	Yes, on the full share	Yours to pay	Self-employed treatment
Professional corporation	W-2	No, payroll tax instead	Withholding covers most	Employee basis
PE platform + equity	W-2 and K-1	On wages via payroll; equity K-1 usually not	Often needed for equity items	Employee basis
MSO-affiliated practice	K-1	Yes, like any partnership	Yours to pay	Self-employed treatment
Direct employment	W-2	No	Rarely needed	Employee basis

The K-1 models route you into the entire partnership tax system: self-employment tax, quarterly estimates, self-employed benefits, and basis tracking. The W-2 models leave payroll in charge but give up the partner deductions and, usually, the retirement plan ceiling.

Watch Out

The hybrid model catches people at the wage base

W-2 plus K-1 combinations require coordination: wages soak up the Social Security wage base, equity K-1s can arrive months after year end, and platform exits can drop a large capital gain into an otherwise ordinary year with no withholding attached. Hybrid physicians need a projection in any year the equity does anything.

What to Check Before You Sign

Four documents beat every verbal description.

The pre-signing checklist

Ask what tax forms a current partner at your target level received last year: W-2, K-1, or both
Read how the operating or shareholder agreement defines admission, buy-in, and what you own if you leave
Get the compensation plan in writing: base, guaranteed payment, profit share, equity vesting
Ask which states the entity files in, and whether the firm withholds or files composite returns for partners

With the model identified, the rest of this cluster does the work: modeling the offer, handling the buy-in, and eventually the exit.

Taxstra CPA Tip

When a recruiter says "partnership track," ask when the K-1 starts. Some tracks convert you to partnership taxation on day one of partnership; others keep new partners on W-2 salary for a transition period; a few "partnerships" never issue K-1s at all because the entity is actually a corporation. The answer changes your first-year planning completely.

Comparing Offers Across Different Models?

A partnership-track offer, a PC shareholder track, and a PE platform with equity cannot be compared on stated compensation alone. A Taxstra CPA can model all three after-tax. The initial consultation is free.

Frequently Asked Questions

Five recur: the true partnership or LLP where partners receive K-1s for everything, the professional corporation where physician shareholders stay on W-2 wages, the private equity platform where clinical pay is W-2 and rollover equity generates a separate K-1, the MSO-affiliated independent practice where the practice itself stays a partnership, and straight hospital or health system employment with no ownership at all.

Know What You Are Joining Before You Join It

The ownership model shapes a decade of your tax life. Book a free initial consultation and have a Taxstra CPA read the documents with you.

Next Steps

Filing it yourself is fine. Optimizing it is where the money is.

Getting the form right keeps you out of trouble. The strategies below are what actually lower the bill.

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Authoritative Sources

Citations reflect U.S. federal tax law as of the article's last reviewed date.

Related Physician Partnership Guides

Self-Employment Tax on K-1 Income

The tax that separates the models most sharply.

Practice Buy-In Taxes

What buying into a true partnership means.

Your First K-1 Year

The playbook once a K-1 model is yours.

Partner Health Insurance

How benefits change in K-1 models.