Is K-1 income better or worse than W-2 income for a doctor?

Neither automatically. K-1 partners pay both halves of employment tax and buy their own benefits, but they gain deductions employees cannot take, larger retirement plan capacity, and upside in practice profits. The comparison depends on the specific offer, which is why the numbers should be modeled before you sign, not after the first K-1 arrives.

Do physician partners pay self-employment tax?

Almost always yes, on both guaranteed payments and their distributive share, because a physician actively practicing through a partnership does not qualify for the limited partner exception. For 2026 that means 15.3% up to the $184,500 Social Security wage base and 2.9% to 3.8% Medicare above it.

Why did my first partner year come with a huge April tax bill?

Because withholding stopped and nobody replaced it with adequate quarterly estimates. Employers withhold automatically; partnerships do not. New partners who keep spending like W-2 earners through their first year routinely face a five-figure catch-up payment plus an underpayment penalty. The fix is safe-harbor estimates set up in the first quarter.

Which large medical employers pay physicians on K-1s?

Physician-owned groups and some private-equity-affiliated platforms. Examples include the Permanente Medical Groups in some regions, Vituity, US Anesthesia Partners, and independent practices inside networks like US Oncology. Structures vary by company, region, and cohort, so the offer documents govern, but these are the employers where partnership taxation typically appears.

Do I need a CPA if I get a K-1?

The first K-1 year is when most physicians move from software to a professional, because the return now involves self-employment tax, quarterly estimates, basis tracking, multi-state allocations, and deductions with documentation requirements. The cost of getting those wrong in a single year usually exceeds years of professional fees.

Physician Partnership Hub

Physician K-1 and Partnership Taxes

Making partner rewires your entire tax life: no withholding, new taxes, new deductions, new deadlines. This is the map, with guides for every piece.

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

Your Guide

01The Five Systems That Change 02How the Income Is Taxed 03Estimates, Benefits, and Retirement 04QBI, State Filing, and Basis 05Employers Where Physicians Get K-1s 06Frequently Asked Questions

Physician Tax Guides>K-1 & Partnership Taxes

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

Quick answer

When a physician becomes a partner, compensation moves from a W-2 to a Schedule K-1: income is taxed as it is earned by the practice, self-employment tax replaces payroll withholding, quarterly estimates become mandatory, and benefits shift to self-employed treatment. New deductions and larger retirement capacity offset much of the cost when planned early.

Somewhere between the champagne and the first quarterly estimate deadline, every new physician partner discovers that making partner is a tax event, not just a career one. The paycheck with taxes neatly removed is gone. In its place: a K-1, a Schedule SE, four estimate deadlines, and a set of deductions nobody mentioned in the offer letter.

This hub covers the whole system: how partnership income is taxed, what self-employment tax really costs, how benefits and retirement change shape, and which major medical employers pay physicians on K-1s in the first place. Each section links to a deeper guide.

The Five Systems That Change

W-2 to K-1 is not a form swap. It is five simultaneous changes.

System	As an employee	As a K-1 partner
Income timing	Taxed as paid	Taxed as the practice earns it, cash or not
Employment tax	7.65% withheld, employer matches	Both halves via self-employment tax
Tax payment	Automatic withholding	Quarterly estimates you must set up
Benefits	Pre-tax through payroll	Self-employed treatment with personal deductions
Deductions	Almost none for work expenses	UPE, retirement, health insurance, home office

If you are still deciding whether to take the partnership offer, start with Making Partner: W-2 vs K-1, which models the decision itself. This hub assumes the K-1 is coming and covers living with it.

How the Income Is Taxed

Allocations drive the bill. Cash is a separate conversation.

The practice files Form 1065 and pays no federal income tax itself. Your share of its income lands on your K-1 and is taxed on your return at ordinary rates, whether the cash was distributed or retained. Three guides cover the mechanics:

How K-1s hit your 1040Income character, where each box lands, and why losses get stuck Distributions vs allocationsWhy the draw is not your taxable income Self-employment taxThe 15.3% question, with the 2026 math worked out

The one-sentence version of physician SE tax

A doctor actively practicing through a partnership should plan on self-employment tax on the whole distributive share; for 2026 that is 15.3% up to the $184,500 wage base and 2.9% to 3.8% above it, with half deductible.

Estimates, Benefits, and Retirement

The three systems you must actively rebuild.

Estimates. Nothing is withheld from partnership income. You pay through four estimated payments, and the safe-harbor rules (generally 110% of last year's tax for incomes over $150,000) are what keep a volatile first year penalty-free. The full setup, including the transition year where W-2 withholding and K-1 income overlap, is in the first-year partner playbook.

Benefits. Partners buy benefits with their own after-tax money and claim personal deductions: the self-employed health insurance deduction, the HSA, personally-owned disability. The full picture, including the spouse-coverage trap, is in partner health insurance and benefits.

Retirement. This is where partnership usually wins. Partner-level 401(k) deferrals ($24,500 for 2026) plus profit-sharing up to the $72,000 defined-contribution ceiling, plus a cash balance plan in many groups, can shelter well over $100,000 a year for a mid-career physician. The stack is covered in retirement plans for physicians.

Taxstra CPA Tip

Do the retirement plan math before complaining about self-employment tax. For many partners the extra plan capacity, deducted at a 35% or 37% marginal rate, is worth more than the entire employer-half of employment tax they now pay themselves. The K-1 giveth too.

QBI, State Filing, and Basis

Three quieter systems that decide real dollars.

QBI. Medicine is a specified service business, so the 20% pass-through deduction phases out at higher incomes. For 2026 the deduction disappears for SSTB owners once taxable income passes $276,750 single or $553,500 married filing jointly, which puts most full-time physician partners at zero or partial benefit. The mechanics and the planning levers are in the QBI deduction guide.

State filing. A K-1 from a group that practices in multiple states can create filing obligations in each of them, with composite return elections and credits for taxes paid coming into play. Which states your K-1s make you file in is covered here, and multi-state physician work generally in the locum tenens tax guide.

Basis. Your outside basis decides whether losses deduct, whether distributions stay tax-free, and what you owe at exit. Most partners have never seen their number. Start with partnership tax basis, and if you paid costs out of pocket, claim them via unreimbursed partnership expenses.

Watch Out

Thinking about routing your K-1 through an entity?

The question every new partner eventually asks, can I hold my partnership interest through an S-corp or PLLC, has a more structural answer than the internet suggests. See S-corps and K-1 income before you pay anyone to set one up.

Employers Where Physicians Get K-1s

Partnership taxation clusters in specific corners of medicine.

Most employed physicians never see a K-1: hospitals, academic centers, and most staffing companies pay W-2 wages. Partnership taxation shows up in physician-owned groups and in equity stakes at private-equity-affiliated platforms. Common patterns:

True partnershipsPhysician-owned groups where partners receive K-1s for clinical income: some Permanente Medical Groups, Vituity, many independent practices

Equity K-1s on top of W-2Platforms where clinical pay is W-2 but physician equity sits in an LLC that issues K-1s, common in anesthesia and radiology consolidators

Practice-level K-1s in networksIndependent practices inside management networks, where the practice stays a partnership and partners get K-1s

We keep employer-specific guides for the organizations physicians ask about most. Each covers the publicly described structure, the tax forms to expect, and the questions your offer documents need to answer:

Kaiser Permanente medical groups Vituity US Anesthesia Partners US Acute Care Solutions Radiology Partners US Radiology Specialists US Oncology Network OneOncology GI Alliance Surgery center ownership (USPI, SCA Health, AmSurg)

Typically no K-1 at hospitals and health systems, academic medical centers, the large W-2 staffing companies, and government or military medicine. If you are choosing between a W-2 system job and a partnership-track group, the tax difference belongs in the comparison alongside the compensation numbers.

Holding a Partnership Offer, or Already in Your First K-1 Year?

The expensive mistakes all happen early: estimates not set, elections missed, deductions unclaimed. A Taxstra CPA works with physician partners nationwide. The initial consultation is free.

Frequently Asked Questions

A physician partner is taxed on their allocated share of practice income at ordinary rates, plus self-employment tax, whether or not the cash was distributed. There is no withholding, so the tax is paid through quarterly estimates. Deductions like unreimbursed partnership expenses, retirement contributions, and the self-employed health insurance deduction reduce the bill.

Get a CPA Who Already Knows Physician Partnerships

Taxstra serves 1,000+ clients nationwide, with deep experience in physician groups, multi-state K-1s, and partnership planning. Book a free initial consultation.

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.

Want a CPA to run the numbers for you?

Free 30-minute call with a Taxstra CPA. No pressure, just the math for your situation.

Authoritative Sources

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

The Full K-1 & Partnership Library

Schedule K-1 Explained

The form itself, box by box.

Form 1065 Explained

The partnership return behind every K-1.

K-1 vs 1099

Partner income vs contractor income, compared.

K-1 Phantom Income

Taxed on money you never received.

Practice Buy-In Taxes

Basis, interest tracing, and the 754 step-up.

Selling a Practice

The tax side of the exit.