Set up payroll (two employers, one team feeling)

An MSO-PC group has two employers. The PC employs clinicians; the MSO employs everyone else. That means two payrolls, two sets of employer registrations per state, and a benefits design that makes one team out of two payrolls.

Prerequisites

Both entities formed with EINs
Employer registrations in every state with employees, for both entities
A clear list of who is employed by which entity

Who employs whom

Role	Employer	Why
Physicians, NPs, PAs, therapists, dentists, anyone practicing	PC	In CPOM states, only the PC may employ clinicians to practice
Medical assistants, clinical support	Usually PC, sometimes MSO	Depends on state rules about clinical staff; take it to counsel
Front desk, scheduling	MSO	Non-clinical
Billers, coders	MSO	Non-clinical, but coding responsibility stays with the PC
Practice managers, administrators	MSO	Non-clinical
Marketing, finance, HR, IT	MSO	Non-clinical
Executives	MSO	And they cannot be PC officers where the state restricts those roles to licensees

The clinical support staff question is genuinely state-dependent. Medical assistants working under clinical supervision look clinical; in some analyses they are MSO-employable, in others not. Get a state-specific answer rather than defaulting either way. See What an MSO can and can’t do.

Steps

Per state, per entity:

Income tax withholding registration
Unemployment insurance registration
Any local or municipal taxes
Workers’ compensation coverage

Both entities, wherever each has employees. Missing one produces penalties that accrue quietly.

Choose the payroll setup

Option	Notes
One provider, two company accounts	Most common. One vendor relationship, two EINs, two funding accounts.
Two separate providers	Rarely worth the added administration
PEO for one or both entities	See below

Test the two-employer case in the demo. Many payroll products assume one business with one EIN. Ask directly: can I run two employers under one login, with separate funding accounts and separate tax filings? A product requiring two entirely separate instances is workable but is not the integration it was sold as. See Bundled payroll and processing.

Fund each payroll from the correct entity's account

Clinical payroll from the PC’s account. Non-clinical from the MSO’s.This is not a bookkeeping preference. Paying clinical payroll from the MSO’s account means the MSO is compensating clinicians for practicing, which is the CPOM prohibition.

Design benefits for parity

Two employers, one team. If the PC’s clinicians and the MSO’s staff sit in the same office with materially different benefits, you have a morale problem and a recruiting problem.Aim for the same health plan design, the same PTO policy, and the same retirement plan structure across both. Note that offering identical plans across two unrelated employers has its own compliance considerations — controlled group and affiliated service group rules can affect retirement plan testing and ACA obligations. This is a real question for your benefits advisor, not a formality.

Handle multi-state payroll as you expand

Each new state means registrations for both entities, state-specific withholding, state unemployment insurance, and any state-mandated programs — paid leave, disability, retirement mandates.Remote employees create nexus in their state of residence. Track where people actually work, not where they were hired.

Get contractor classification right

Misclassifying clinicians as independent contractors is a common and expensive error. A clinician who works set hours, at your location, using your equipment, under your policies, seeing your patients, is generally an employee regardless of what the agreement says.Exposure includes back employment taxes, penalties, benefits claims, and state wage-and-hour liability. Classification tests differ between the IRS, the Department of Labor, and each state, and several states apply notably strict tests.Some clinicians are genuinely contractors — true locums, occasional coverage, clinicians with independent practices. Most staff clinicians are not. Take it to employment counsel.

Note also that a contractor clinician still must be credentialed and linked to the PC’s payer contracts to bill for their services.

PEOs

A professional employer organization becomes a co-employer, handling payroll, benefits, and compliance.

For	Against
Better benefits pricing at small scale	Cost, typically a percentage of payroll
Multi-state registration handled	Less control
Compliance support	Exiting is disruptive
Reduced administrative load	The co-employment relationship needs CPOM analysis

A PEO co-employing your clinicians deserves specific analysis. In a CPOM state, the question of whether a lay co-employer employing physicians to practice creates exposure is not obvious. Some groups use a PEO for the MSO only and keep the PC’s payroll direct. Raise it with healthcare counsel before signing.

Verify it worked

Both entities registered as employers in every state where each has employees
Clinicians employed by the PC
Non-clinical staff employed by the MSO
Clinical support staff classification confirmed with counsel
Clinical payroll funded from the PC’s account; non-clinical from the MSO’s
Payroll provider handles two employers without separate instances
Benefits designed for parity, with controlled-group implications reviewed
Contractor classifications reviewed by employment counsel
Multi-state registrations current as you expand

Common failure modes

Failure	Consequence
MSO employing clinicians	Direct CPOM violation
Clinical payroll paid from the MSO’s account	Same problem, via the money flow
Only one entity registered in a state	Payroll tax penalties
Payroll product that can’t handle two EINs	Duplicate administration
Divergent benefits between entities	Morale and recruiting problems
Clinicians misclassified as contractors	Back taxes, penalties, benefits claims
PEO co-employing clinicians without CPOM review	Unanalyzed exposure
Remote employees creating unregistered nexus	Penalties

Formation & Corporate

Agreements

Credentialing & Payer Enrollment

Billing Operations

Patient Payments & Refunds

Banking & Finance

Compliance Tasks

Set up payroll (two employers, one team feeling)

Prerequisites

Who employs whom

Steps

PEOs

Verify it worked

Common failure modes

​Prerequisites

​Who employs whom

​Steps

​PEOs

​Verify it worked

​Common failure modes

Prerequisites

Who employs whom

Steps

PEOs

Verify it worked

Common failure modes