Definition
A professional employer organization (PEO) is a company that enters a co-employment relationship with a business, taking over payroll, tax filing, benefits, and HR compliance tasks for the client's workers. The client keeps day-to-day control of the work. PEOs are typically paid a fee based on payroll costs.
Also known as: PEO, co-employment
How it works
A business signs a client service agreement with a PEO. The PEO becomes co-employer of the client's worksite employees for defined purposes, typically payroll, benefits, workers' compensation, and HR compliance support. The PEO usually runs payroll and files employment tax returns, often under its own EIN, and offers benefit plans purchased on a pooled basis across its clients.
The client still decides who to hire, what work to assign, and how to manage performance. Fees are commonly a percentage of payroll or a per-employee charge. Because tax filing responsibilities shift, the IRS operates a voluntary certification program, created by the Tax Increase Prevention Act of 2014, for certified PEOs (CPEOs). A CPEO is solely liable for the employment taxes on pay it makes to worksite employees.
Example
A 40-person marketing agency in one state hires a PEO to run payroll, offer a shared health plan, and manage workers' compensation. The agency's owners continue to hire, assign work, and manage staff directly.
How it differs from similar terms
Professional Employer Organization vs Employer of Record. A PEO co-employs workers alongside a client that keeps its own entity. An EOR is the sole legal employer, usually to hire where the client has no entity.
Professional Employer Organization vs Human Resource Information System. A PEO is a service arrangement that shares employer duties. An HRIS is software the employer uses to store and manage employee data.
Free checklist
Buyer's checklist: PEO Services
Everything to check before you sign with a PEO provider, on one printable page.
- 8 questions to ask every vendor, with how to verify each answer
- 10 capabilities to confirm in a demo
- 6 pricing questions about fees outside the quote
- A scorecard of the 5 products we rank highest, with what we verified
Facts as of Oct 25, 2026 · LeadChange Research Team
What it checks
- Certification and tax responsibility
- Fee structure and what it covers
- Benefits plan access and flexibility
- Workers' compensation approach
- Contract terms and exit rights
- HR and compliance support depth
- Technology and reporting
- Geographic and industry fit
Sample question
Certification and tax responsibility
Look the provider up in the IRS CPEO public listings, which the IRS updates each quarter and which also list suspended and revoked CPEOs. Then confirm in the contract who files and pays employment taxes.
Frequently asked questions
What does PEO stand for?
PEO stands for professional employer organization: a company that co-employs a client business's workers and takes over payroll, employment tax filing, benefits and HR compliance tasks, while the client keeps directing the work.
How does a PEO make money?
The IRS notes that PEOs are typically paid a fee based on payroll costs. Ask each PEO to state its fee as a monthly amount per employee, separate from benefit premiums, so quotes can be compared.
What is the downside of a PEO?
A PEO is less suited to a company that wants to pick its own benefit carriers or keep every tax account in its own name, because benefits come from the PEO's pooled plans and payroll often runs under the PEO's EIN. With a PEO that is not IRS-certified, the employer remains ultimately responsible for federal employment taxes even when the PEO handles the deposits. Leaving a PEO later means moving payroll, tax accounts and benefits at the same time.
What is a certified PEO (CPEO)?
A CPEO is a PEO that the IRS has certified under a voluntary program created by the Tax Increase Prevention Act of 2014. Certification means the PEO met background, experience, financial, tax compliance, and bonding requirements. Customers can check a CPEO's status in the IRS public listings.
Who is liable for employment taxes under a CPEO arrangement?
For pay a CPEO makes to worksite employees, the IRS states the CPEO is generally solely liable for paying employment taxes, filing returns, and making deposits. The CPEO files under its own EIN and uses Schedule R to allocate data. The CPEO and its customer may both be liable for pay to non-worksite employees.
Does a PEO take over management of employees?
No. A PEO shares administrative and compliance duties, such as payroll, benefits, and tax filing. The client business continues to hire, direct work, set schedules, and manage performance. The split of responsibilities is defined in the client service agreement, so review it carefully.
Compare PEO options
See every PEO product we rank, with verified prices and features.