Section 125 Plan for Medical Practices: The 2026 Employer Guide

• Only 42.2% of physicians worked in a wholly physician-owned private practice in 2024, down 18 percentage points from 60% in 2012, while 34.5% worked for a hospital-owned practice and 12.2% were directly employed by a hospital (American Medical Association 2024 Physician Practice Benchmark Survey).
• The share of physicians working at a private-equity-owned practice rose from 4.5% in 2022 to 6.5% in 2024, with 38% of those practices acquired in just the past five years (AMA 2024 Physician Practice Benchmark Survey).
• The Bureau of Labor Statistics reports a median annual wage of $44,200 for medical assistants in May 2024, $129,210 for nurse practitioners, and $133,260 for physician assistants.
• UnitedHealth Group's Optum directly employs roughly 9,000 physicians and holds risk-based affiliations with tens of thousands more, together touching close to 10% of the entire U.S. physician workforce, illustrating how far employed-physician scale now reaches.
• Employer FICA recapture on a Section 125 election runs 7.65% of every pre-tax dollar, against Benecor's $35 per enrolled employee per month administration fee.

More physicians in the United States now collect a W-2 than run their own shingle. Only 42.2% of physicians worked in a wholly physician-owned private practice in 2024, the American Medical Association's own Physician Practice Benchmark Survey found, down from 60% just twelve years earlier. That single shift changes the Section 125 eligibility question for a medical practice entirely: unlike a law firm where the equity partners running the place are excluded owners, or a dental office where the owner-dentist sits outside the plan, most of the physicians walking a medical practice's halls today are eligible W-2 employees, not excluded owners. For a medical assistant earning the national median wage of $44,200 a year in Minneapolis, Minnesota, electing $250 a month in benefits through a correctly structured plan is worth roughly $30.52 more per paycheck on identical coverage. The full benefit stack every eligible participant receives is in the table below.

How does a Section 125 plan work for a medical practice?

A Section 125 plan works by moving a staff member's benefit premiums out of taxable wages before payroll taxes are calculated. A medical assistant, nurse, front-desk coordinator, or correctly classified employed physician elects coverage, and the election comes out of each paycheck before federal income tax, Social Security, and Medicare apply, so both the employee and the practice owe less tax on the same dollar. The staff member stays on payroll exactly as before, and the only change is that the elected benefit dollars now reduce the wage base reported on IRS Form 941. This matters more in a medical practice than in many small businesses because the workforce mix, licensed clinical staff, hourly support staff, and sometimes W-2 or 1099 physicians working side by side, means eligibility has to be checked person by person rather than assumed for the whole team. For the underlying mechanics that apply to any employer, see the full Section 125 plan hub→.

How much does medical office staff save with a Section 125 plan?

Medical office staff save money under a Section 125 plan because a pre-tax election lowers the paycheck's federal taxable wages, Social Security wages, and Medicare wages at the same time, the same three boxes a practice reports on the employee's W-2. A medical assistant in Minneapolis, Minnesota, earning the national median wage of $44,200 a year and electing $250 a month, $115.38 per biweekly paycheck, in benefits moves that election out of Box 1, Box 3, and Box 5 before any tax is calculated. At the 12% federal bracket, the 7.65% combined FICA rate, and Minnesota's 6.80% marginal state bracket for this income level (Minnesota Department of Revenue, 2025 rates in effect for 2026), that single election is worth roughly $30.52 more per paycheck compared to buying the identical benefit with post-tax dollars. The practice recaptures its own 7.65% employer FICA share on the same election, worth $229.50 a year for this one medical assistant.

Over a full year, that $30.52 per paycheck adds up to $793.52 in additional take-home pay for a single medical assistant electing $250 a month in benefits, on identical gross wages and identical coverage. The employer side of the math runs independently: a $3,000 annual election at a 7.65% employer FICA rate works out to $229.50 in recaptured employer tax for that one medical assistant, a figure that scales directly with the number of enrolled staff and the size of each election.

Who on a medical practice's staff is actually eligible for a Section 125 plan?

W-2 employees of a medical practice are eligible for a Section 125 plan, but a medical office's workforce mix makes this a genuinely person-by-person question rather than a whole-staff assumption. Medical assistants, nurses, front-desk coordinators, and office managers are almost always straightforward W-2 employees and are fully eligible. Employed physicians, advanced practice clinicians, and locum tenens providers are where the eligibility answer changes based on how each person is actually paid, and getting the classification wrong creates both a Section 125 eligibility problem and a broader worker misclassification exposure that reaches well beyond benefits.

Are employed physicians W-2 eligible for a Section 125 plan?

An employed physician is a W-2 employee, and therefore Section 125 eligible, whenever a hospital system, corporate-owned group, or MSO-affiliated professional corporation pays them on payroll rather than as a practice owner. The American Medical Association's 2024 Physician Practice Benchmark Survey found that just 42.2% of physicians still worked in a wholly physician-owned private practice, down from 60% in 2012, while 34.5% worked for a hospital-owned practice, 12.2% were employed directly by a hospital, and 6.5% worked at a private-equity-owned practice, up from 4.5% just two years earlier. Add those employed categories together and well over half of practicing U.S. physicians today collect a W-2, meaning most physicians on a typical practice's roster are Section 125-eligible the same way a nurse or medical assistant is, a materially different starting point than the licensed-professional verticals where the person providing the core service is usually the excluded owner.

Do locum tenens physicians qualify for a Section 125 plan?

A locum tenens physician filling in through a staffing agency is typically a genuine 1099 independent contractor, not a W-2 employee of the practice using their services. The agency, or the physician acting as a self-employed contractor, handles tax withholding and billing, and the practice pays a contracted rate to the agency rather than issuing a paycheck directly to the locum. Because Section 125 reaches W-2 wages only under IRC Section 125(d)(1)(A), a genuine locum tenens physician stays outside any Section 125 plan the host practice offers its own staff, the same structural exclusion that applies to a 1099 owner-operator in trucking or a booth-renting stylist in a salon, even when the locum has covered shifts at the same practice for years.

Does the physician who owns the practice get the pre-tax savings too?

It depends on how the practice is structured. A sole proprietor, a partner in a partnership, or a more-than-2-percent shareholder in an S corporation cannot take the pre-tax benefit on their own premiums through a Section 125 plan, since the Internal Revenue Code treats these ownership structures as self-employment for benefits purposes regardless of how the practice pays the owner day to day. The practice's W-2 staff, medical assistants, nurses, front-desk employees, and correctly classified employed physicians, remain fully eligible, and the practice still recaptures FICA on every one of their contributions even though the owner's own premium stays outside the plan.

Our first assumption was that the plan basically only covered front desk and our MAs, because we kept thinking of the doctors as owners. Once we actually mapped it out, four of our six physicians are W-2 through the professional corporation. That changed the whole savings number.

How does a Section 125 plan work across an MSO-affiliated practice group?

A Section 125 plan for an MSO-affiliated group has to account for how management services organizations are actually structured, not how they are marketed. In most states, the corporate practice of medicine doctrine prohibits a non-physician-owned entity from directly employing physicians or exercising clinical control, so the MSO instead operates under a management services agreement with a physician-owned professional corporation, providing administrative and back-office support, while the physician-owned PC remains the legal employer of the physicians and, in many models, the clinical staff. That split matters directly for Section 125, because a plan has to be adopted by the correct legal employer for each group of employees, not by the MSO brand name that appears on the sign outside.

Does an MSO-affiliated group need controlled-group nondiscrimination testing?

Whether affiliated locations must be tested together depends on whether the arrangement creates common control under IRC Section 414(b), (c), or (o), a fact-specific determination that turns on ownership and management structure rather than on the MSO's brand or marketing materials. A single owner-physician who owns several affiliated locations outright is a more straightforward common-control case than a group of separately owned professional corporations that merely share an MSO's back-office services under near-identical management services agreements. Benecor reviews the actual ownership and management structure of every affiliated location before finalizing nondiscrimination testing, since assuming either answer without checking creates real compliance exposure in either direction. The closest structural parallel on this site is a dental support organization-affiliated dental group→, where the same MSA-and-PC split raises the identical controlled-group question.

Does the ACA employer mandate apply across affiliated MSO locations?

Practices with 50 or more full-time equivalent employees across all commonly owned or controlled entities are applicable large employers subject to the ACA employer shared responsibility mandate, and an MSO-affiliated group of several practices under common ownership aggregates its FTE count the same way any other commonly controlled group does. A Section 125 plan is fully compatible with ACA compliance, and Benecor's benefit stack includes minimum essential coverage designed to satisfy the mandate for qualifying staff once the correct aggregation picture is confirmed.

What does medical office staff actually get pre-tax?

Medical assistants and nurses work a clinical schedule that leaves little room to step away for a routine doctor's appointment of their own during a full patient day, which is exactly the access gap Benecor's benefit stack is built to close.

• $0 Virtual Urgent Care, 24/7: A medical assistant who wakes up with strep symptoms the night before a fully booked clinic day can see a provider from their phone before their shift instead of losing the day.
• $0 Virtual Primary Care: Routine visits and prescription renewals that fit around a clinical schedule instead of requiring a mid-day gap most medical office staff do not have.
• $0 Mental Health Counseling: Licensed counseling accessible virtually, without needing to find an in-network provider with daytime availability that matches a practice's hours.
• 800+ commonly prescribed medications at $0: Maintenance medications at no out-of-pocket cost for staff who spend most of the working day on a patient-facing schedule of their own.
• Procedures at 57% savings, specialist visits at 35% off, lab tests at 60% off, imaging at 75% off: When staff need in-person care beyond what telehealth covers, network discounts make it affordable rather than something to put off.
• Dental, vision, and family coverage with 350,000+ doctors nationwide: Full family coverage for staff who spend their days helping patients access care they may be putting off for themselves.

Section 125 for medical practices of every size

Solo and small independent practices

A 10-person practice with one owner-physician excluded from pre-tax participation, two employed physicians, one nurse practitioner, and six medical assistants and front-desk staff has 9 eligible participants. At a typical $300 average monthly election, that practice recaptures approximately $2,479 a year in employer FICA. Independent and small employed-physician practices make up a large share of the roughly 220,000 physician office establishments operating nationally, and Benecor handles the plan document, nondiscrimination testing, and payroll configuration end to end, with no additional HR staff required on the practice's side.

MSO-affiliated regional groups

An 8-location MSO-affiliated group with 120 eligible staff across its locations, averaging 15 per site, at a $350 average election, recaptures approximately $38,556 a year in employer FICA. A 40-location regional group with 600 eligible staff at a $380 average election recaptures approximately $209,304 a year. At this scale, the controlled-group question stops being theoretical and becomes the difference between testing each location on its own and testing the group together, which is exactly the review Benecor runs before enrollment opens.

National employed-physician platform scale

UnitedHealth Group's Optum directly employs roughly 9,000 physicians and holds value-based, risk-sharing affiliations with tens of thousands more, together touching close to 90,000 physicians and 40,000 advanced practice clinicians, close to 10% of the entire U.S. physician workforce. Privia Health, a physician-enablement platform built on the MSO model, runs its own operations with roughly 1,200 to 1,400 corporate employees supporting a much larger network of affiliated physician practices. Neither organization publishes a consolidated non-physician staff headcount suited to a per-location FICA estimate, so to illustrate the scale of recapture at a national platform's size, a hypothetical 400-location group averaging 12.5 eligible employees per location, 5,000 eligible employees total, at a $400 average election, recaptures approximately $1,836,000 a year in employer FICA, a figure driven almost entirely by how consistently enrollment and physician classification are handled across every affiliated location rather than by anything in the plan design itself.

Compliance: nondiscrimination testing and classification risk

Nondiscrimination testing for a medical office

Section 125 requires three annual nondiscrimination tests: an eligibility test confirming the plan covers a broad cross-section of staff, a benefits test confirming highly compensated employees, those earning above $160,000 in 2026 under IRC Section 414(q), do not receive disproportionate average benefits, and a key employee concentration test capping benefits to officers and owners earning above $235,000 at 25% of total plan benefits. A typical medical practice, where medical assistants median $44,200 and nurse practitioners and physician assistants median well above $125,000, usually passes these tests comfortably once owner-physicians are correctly excluded and employed-physician and locum classification is confirmed.

The classification risk to avoid

The single biggest compliance risk in a medical practice's Section 125 plan is enrolling a locum tenens physician who should have been excluded as a 1099 contractor, or the reverse, treating a genuinely employed physician or advanced practice clinician as an excluded owner simply because they hold a clinical title. Either mistake carries real exposure. Enrolling a genuine 1099 locum risks the plan's tax treatment, and wrongly excluding an eligible W-2 physician or APC leaves real FICA recapture and real take-home pay improvement on the table for no compliance reason at all. Benecor confirms classification against the actual payroll, payer, and MSO-agreement facts of each provider relationship before any enrollment happens, rather than relying on a job title or a common assumption about how physicians get paid.

Launching §125 for a medical practice: 5 weeks

1. Week 1: Benecor models the practice's payroll segmented into W-2 clinical/support staff, W-2 employed physicians and APCs, and any 1099 locum tenens providers, confirming eligibility for each group. You receive a signed savings projection and select the benefit menu.
2. Week 2: Independent ERISA counsel drafts the plan adoption agreement and summary plan description, and for MSO-affiliated groups, reviews the management services agreement structure for controlled-group implications.
3. Week 3: Classification review on every employed physician, APC, and locum tenens relationship, confirming who is actually eligible before enrollment opens.
4. Week 4: Enrollment scheduled around patient hours, short between-patient sessions or a single before-hours meeting, with per-paycheck dollar savings shown at each staff member's actual wage.
5. Week 5: Election data transmitted to the practice's payroll system, deduction codes configured as pre-tax, and a test payroll run confirms federal income tax and FICA are correctly reduced before the first live pre-tax payroll.