A PEO (professional employer organization) is a company that shares employer responsibilities with your business through a co-employment arrangement. The PEO handles payroll, employment tax filings, employee benefits, workers’ compensation and HR compliance, while you keep full control of hiring, firing, pay decisions and day-to-day work. Because a PEO pools employees from many businesses, small companies can access benefits and HR expertise usually only available to large employers.
If you run a small or mid-sized business and HR, payroll and compliance are eating into your time, a PEO is one of the main options to consider. This guide explains how a PEO works, what it does and doesn’t do, what it typically costs, and how to tell whether it’s the right fit for your business.
How a PEO works: co-employment explained
When you partner with a PEO, you and the PEO become co-employers of your employees. Each party takes on specific responsibilities, which are set out in a client service agreement.
| Your business keeps | The PEO typically takes on |
|---|---|
| Hiring and firing decisions | Payroll processing and payroll tax filing |
| Setting pay, roles and schedules | Employee benefits plans and administration |
| Directing day-to-day work | Workers’ compensation coverage and claims management |
| Your culture, products and customers | HR compliance support, policies and employee handbooks |
| Ownership of your business | Unemployment claims, garnishments and HR paperwork |
In most arrangements, the PEO reports wages and pays employment taxes under its own federal employer identification number (EIN). Your employees see the PEO on their pay stubs and benefits paperwork, but they still work for you.
What does a PEO do?
Services vary between providers, but a full-service PEO usually covers:
- Payroll and payroll taxes: processing pay, direct deposit, tax filings and W-2s.
- Employee benefits: medical, dental, vision, life insurance and retirement plans, often at large-group rates.
- Workers’ compensation: coverage, safety programs and claims management.
- HR support and compliance: handbooks, policies, terminations, employee relations, and federal and state employment law.
- HR technology: an online portal where employees can view pay stubs, W-2s and benefits.
- Risk management: help with unemployment claims, FMLA administration and audits.
PEO vs payroll provider vs HR consultant
A PEO is not the only way to outsource HR. Here’s how the main options compare:
| PEO | Payroll provider | HR consultant | |
|---|---|---|---|
| Payroll and tax filing | Yes | Yes | No |
| Employee benefits at group rates | Yes | Sometimes, as an add-on | No |
| Workers’ compensation | Yes | Sometimes, as an add-on | No |
| Ongoing HR advice and compliance support | Yes | Limited | Yes |
| Shares employer liability | Yes (co-employment) | No | No |
| Best for | Businesses wanting HR, payroll and benefits handled together | Businesses that only need payroll | Businesses with in-house admin needing expert advice |
For a deeper comparison, read the difference between a PEO and an online HR services company.
PEO vs ASO: what’s the difference?
An administrative services organization (ASO) handles many of the same HR and payroll tasks as a PEO, but without co-employment. With an ASO, your business stays the sole employer: payroll taxes are filed under your own EIN, you buy your own benefits plans, and you keep full employer liability. A PEO, by contrast, shares certain employer responsibilities with you and can give you access to its large-group benefits plans.
An ASO can suit larger businesses that already have competitive benefits. A PEO is usually the better fit for small businesses that want better benefits, workers’ comp and HR compliance handled together.
What are the benefits of using a PEO?
According to the National Association of Professional Employer Organizations (NAPEO), businesses that use a PEO grow twice as fast, have 12% lower employee turnover and are 50% less likely to go out of business. NAPEO’s 2026 industry footprint report found that at the end of 2025, 502 PEOs served 5.4 million worksite employees at 233,000 client businesses in the US.
For small business owners, the practical benefits usually come down to:
- Better benefits: access to benefit plans and rates that are hard to get as a small group, which helps you hire and keep good people.
- Less compliance risk: HR professionals keep track of changing federal, state and local employment laws.
- Time back: less time spent on payroll, paperwork and HR questions.
- Predictable workers’ comp: pay-as-you-go premiums instead of large deposits and year-end audits.
What are the downsides of a PEO?
A PEO isn’t right for every business. Before you sign, consider:
- Less choice over plan design: you choose from the PEO’s benefit plans rather than building your own from scratch.
- Cost: if you only need payroll, a PEO may cost more than a payroll-only provider.
- Contract terms: check notice periods and what happens to benefits and records if you leave.
- Service model: some PEOs rely on call centers. Ask whether you get a named HR contact and payroll specialist.
See common misconceptions about partnering with a PEO for more.
How much does a PEO cost?
Most PEOs price their services in one of two ways:
- Percentage of payroll: a fee based on your total gross payroll.
- Per employee per month (PEPM): a flat fee for each employee.
Benefits premiums and workers’ compensation are usually billed on top of the service fee. To compare fairly, add up what you spend today on payroll software or services, benefits, workers’ comp, HR support and your own time, and ask each PEO for an itemized quote.
Is a PEO right for your business?
A PEO is often a good fit if:
- You have employees but no dedicated HR person.
- You want to offer better benefits to compete for talent.
- You’re spending too much time on payroll, HR paperwork or compliance questions.
- You’re growing and want HR processes in place before problems appear.
- Workers’ comp deposits or audits are a recurring headache.
If you already use a PEO, our annual PEO review checklist will help you check it’s still working for you.
What is a certified PEO (CPEO)?
Some PEOs choose to become a Certified Professional Employer Organization (CPEO) through the IRS. To be certified, a PEO must meet IRS background, experience, business location, financial reporting, tax compliance and bonding requirements. Certification is voluntary, so it’s worth asking any PEO you’re considering whether it is certified and how it handles your employment tax filings.
How to choose a PEO
Look for a PEO that understands your state and industry, gives you named people to work with, and is transparent about pricing and contract terms. Our guide to 5 things to know before choosing a PEO covers the questions to ask, and local vs national PEOs explains why location matters.
Focus HR: a local Arizona PEO for small businesses
Focus HR has helped Arizona small businesses with HR outsourcing, payroll, benefits and compliance since 2003. Every client gets a dedicated HR manager and payroll specialist, there’s no minimum employee requirement, and you get access to benefits at large-group rates.
Book a free consultation to find out whether a PEO makes sense for your business.
Frequently asked questions about PEOs
PEO stands for professional employer organization. A PEO enters a co-employment relationship with your business and takes on payroll, employment tax filing, benefits administration, workers’ compensation and HR compliance support for your employees.
No. You still hire, fire, set pay, direct day-to-day work and run your business. The PEO handles the administrative and compliance side of employment, such as payroll, tax filings, benefits and workers’ compensation.
No. A staffing agency supplies temporary workers who belong to the agency. A PEO supports your existing, permanent workforce. Your employees stay your employees; the PEO shares certain employer responsibilities with you.
It depends on the PEO. Some set a minimum headcount. Focus HR has no minimum employee requirement, so businesses with just a few employees can partner with us.
PEOs usually charge either a percentage of total payroll or a flat fee per employee per month, plus the cost of benefits and workers’ compensation. Ask any PEO for an itemized quote so you can compare it with what you spend today on payroll, benefits, insurance and admin time.
Yes. Arizona generally requires employers with at least one employee to carry workers’ compensation insurance. Through Focus HR, workers’ comp is pay-as-you-go with payroll, with no deposits and no year-end audits.
