Co-employment is the contractual arrangement at the heart of every PEO relationship: the professional employer organization becomes an employer of your staff for defined administrative purposes, payroll, employment tax filing and benefits, while your company keeps hiring, firing and day-to-day direction. It is not the same as an employer of record, where the provider is the sole legal employer. In a co-employment arrangement your company still needs its own legal entity, and the split of responsibilities is set out in a client service agreement, which is the document to read before signing anything.
What the PEO takes on, and what stays with you
Under a typical client service agreement the PEO processes payroll, remits federal and state employment taxes under its own accounts, administers benefits plans and workers' compensation, and handles related filings. The client company keeps everything that makes it the operating employer: recruiting, setting pay, supervising work, discipline and termination decisions, and workplace safety in practice. NAPEO, the industry association, describes the model as PEOs handling the back-office administrative tasks so the client can focus on running the business; roughly 500 PEOs operate in the United States serving approximately 200,000 mostly small and mid-size clients. The boundary is contractual, not automatic, so two PEO agreements can split duties differently.
The tax liability question, and why CPEO status exists
In an ordinary co-employment arrangement, if the PEO collects payroll tax money from you and fails to remit it, the IRS can still pursue the client. That gap is exactly what the certified PEO program addresses: under section 3511 of the Internal Revenue Code, a CPEO certified by the IRS takes on sole liability for the federal employment taxes on wages it pays to worksite employees. Certification requires a business entity with at least one US physical location, a history of financial responsibility, organizational integrity and tax compliance, and management that is majority US citizens or residents with employment tax knowledge. The IRS publishes the list of certified, suspended and revoked CPEOs and updates the active list quarterly, so the claim is checkable, not a sales line.
Where co-employment goes wrong
The common failure modes are boundary failures. A client assumes the PEO is watching wage and hour compliance when the agreement leaves that with the client; a PEO's benefits plan terms change and the client finds out at renewal; or a company treats the PEO as a shield for employment decisions it still legally owns, such as terminations and classification of workers. Co-employment also does nothing for a hire in a country where you have no entity, because the model presumes you are already an employer there; that is EOR territory. Read the client service agreement for who owns each obligation, what happens to the benefits plan and state unemployment accounts if you leave, and what notice the exit requires.
Questions people ask about peo co employment
Is co-employment the same as joint employment?
No. Co-employment is a voluntary contractual split of employer responsibilities between a PEO and its client. Joint employment is a legal finding a court or agency can make about two businesses and one workforce, often in disputes. A PEO agreement is designed to define the split cleanly; it does not decide how a court would rule.
Do my employees stop being my employees under a PEO?
No. They become employees of both parties for different purposes: the PEO for payroll, tax remittance and benefits administration, and your company for direction, supervision and the work itself. Under an EOR, by contrast, the provider is the sole legal employer.
Who is liable if a PEO fails to pay the payroll taxes it collected?
With a non-certified PEO, the IRS can pursue the client for unpaid federal employment taxes. A certified PEO (CPEO) takes sole liability for federal employment taxes on wages it pays to worksite employees under section 3511, which is the main practical reason to check the IRS's published CPEO list.
Does co-employment work for hiring abroad?
Not on its own. Co-employment presumes your company already has an entity and employer registrations in the country. For a hire where you have no entity, the comparable product is an employer of record, which becomes the sole legal employer locally.