A co employment agreement is the contract that makes a PEO relationship work. The PEO industry's trade body, NAPEO, defines co-employment as a contractual agreement between a company and a PEO that allocates and divides employer responsibilities, and the document that does the allocating is the client service agreement, or CSA. Under it, your employees work for two entities at once: your company, which keeps running the business and directing the work, and the PEO, which takes on defined employment administration functions. What exactly moved, and what did not, is entirely a question of what the CSA says.
What the agreement allocates to the PEO
In NAPEO's description, the PEO side of the split typically covers payroll processing, payroll tax administration, employee benefits, HR services, workers' compensation coverage and claims management, compliance assistance and the HR technology platform. The client company retains all business decisions, operations, day-to-day supervision, job assignments and employee reviews, and continues to set salaries and choose which benefits to offer. Reading a CSA against that template is the fastest way to spot a nonstandard deal: any clause that purports to move hiring and firing authority, work direction or business operations to the PEO is unusual and deserves scrutiny, as does any silence about a function you assumed was included, such as state unemployment account management or benefits plan sponsorship.
The federal tax dimension: certified PEOs
Payroll tax is where co-employment gets legally sharpest, because someone must be liable to the IRS for withheld employment taxes. The IRS runs a voluntary certification program for PEOs, created by the Tax Increase Prevention Act of 2014, under which a certified professional employer organization must demonstrate financial responsibility, organizational integrity and tax compliance, maintain a physical US location, and be managed largely by US citizens or residents with employment tax competence. Certification matters to the customer because it changes who the IRS looks to for the federal employment taxes on wages the CPEO pays; with a non-certified PEO, the client's exposure if the PEO fails to remit is a materially different question. A CSA should state plainly whether the provider is a CPEO and which entity carries federal tax liability.
What co-employment does not change
The agreement reallocates administration; it does not repeal employment law. Wage and hour obligations under the Fair Labor Standards Act, which sets the federal minimum wage of 7.25 dollars an hour and overtime at one and a half times the regular rate past 40 hours in a workweek, attach to the employment relationship regardless of how a CSA divides back-office duties, and day-to-day supervision stays with the client in every standard arrangement. The same logic runs through anti-discrimination law, leave law and workplace safety: agencies and courts look at who actually controls the work, not only at contract labels. A CSA that reads as if the client has outsourced its way out of employer status is describing a product that does not exist; what it can genuinely deliver is competent shared administration and clearer allocation of specific liabilities.
Reading a CSA before signing
Five clauses decide most of the value. Termination: notice period, exit assistance and what happens to benefits enrollment when you leave. Liability allocation: who pays when a tax filing, wage payment or benefits determination goes wrong, and whether indemnities are capped. Pricing: whether fees are a flat per-employee amount or a share of payroll, and what triggers changes. Benefits: which entity sponsors the plans and what happens to employees' coverage at exit. Data and transition: what employee records you receive back and in what format. None of this replaces counsel; a CSA is a negotiated commercial contract, the specific document controls, and nothing on this page is legal or tax advice.
Questions people ask about co employment agreement
What is a co employment agreement?
The contract, usually called a client service agreement, between a company and a PEO that divides employer responsibilities: the PEO takes defined administrative functions such as payroll, payroll tax and benefits, while the client keeps business operations and day-to-day supervision.
Does a co employment agreement make the PEO the employer?
It makes both parties employers for different purposes. The client continues to direct the work and run the business; the PEO becomes responsible for the administrative employer functions the CSA assigns to it.
Why does IRS certification of a PEO matter?
A certified PEO has met IRS standards for financial responsibility and tax compliance, and certification affects who is liable for federal employment taxes on wages the CPEO pays, which is a core risk question in any CSA.
Is a co employment agreement the same as an EOR contract?
No. A PEO co-employs workers your own entity already employs, mostly a US product; an employer of record is the sole legal employer in a country where you have no entity. The contracts allocate risk very differently.