What is a PEO?
A professional employer organization (PEO) becomes the co-employer of your staff. It runs payroll and payroll taxes, offers big-company benefits, handles workers' comp, and helps with HR compliance, while you keep running the business.
How co-employment works
You sign a client service agreement. The PEO becomes the employer of record for tax and benefits purposes: it reports wages under its own tax ID and sponsors the health plan. You still hire, fire, set pay and direct the work.
Because a PEO pools employees from many companies, it can usually buy health insurance and workers' comp on better terms than a 15-person company can alone.
What a PEO handles
- Payroll, payroll tax filing and W-2s
- Health, dental, vision and retirement benefits
- Workers' comp coverage and claims
- HR compliance, handbooks and training
- Onboarding and HR software
What a PEO costs
Most PEOs charge $40–$160 per employee per month, or 2–12% of payroll, for administration. Benefits and workers' comp are billed on top. Justworks publishes $79 per employee for its Basic plan; most others quote. See every PEO's price.
How big is the industry?
NAPEO, the industry association, counts 502 PEOs serving 233,000 clients, with $446 billion in industry revenue and 7.2% annual growth since 2008. Only 122 PEOs hold IRS certification (CPEO) on the list dated Aug 7, 2026.
Why IRS certification (CPEO) matters
A certified PEO is solely liable for federal employment taxes on the wages it pays, and your Social Security wage base doesn't restart when you join or leave mid-year. ESAC accreditation is a separate, voluntary standard backed by surety bonds. See certified PEOs.
When a PEO makes sense
- You have roughly 5–150 employees and no full HR team
- Benefits cost too much or you can't offer competitive plans
- You're hiring in a new state
- Workers' comp is expensive for your industry
When it doesn't
If you want to keep your own benefits plans and tax ID, an ASO may fit better (PEO vs ASO). If you're hiring abroad without a local entity, you need an EOR (PEO vs EOR).
Questions buyers ask
Do I lose control of my employees with a PEO?
No. You still hire, fire, set pay and direct day-to-day work. The PEO handles the employer administration.
What's the smallest company a PEO will take?
Justworks and Amplify HR take one employee. ADP TotalSource, Insperity and Paychex PEO report a 5-employee minimum; G&A Partners requires 10.
Are PEO statistics like '50% less likely to go out of business' reliable?
They come from NAPEO, the industry's trade association, which doesn't name the underlying study on its statistics page. Treat them as directional.