Quick answer: what is a PEO?
A PEO (professional employer organization) is a company that becomes your co-employer. It runs payroll, files payroll taxes, and provides benefits and workers’ comp under its own accounts, while you keep control of hiring, pay and daily work. It is a US arrangement, and you need your own US entity to use one.
- Typical cost$40 to $160 per employee per month, or 2% to 12% of payroll
- Best forSmall US teams. The average PEO client has 23 worksite employees
- Check firstCPEO status and ESAC accreditation
- Hiring abroad?Use an employer of record instead, not a PEO
Key takeaways
A professional employer organization (PEO) is a company that becomes your co-employer. It runs payroll, files employment taxes under its own accounts, provides group health coverage and workers’ compensation, and handles HR compliance, while you still hire, manage and fire. NAPEO’s 2026 industry data counts about 233,000 client businesses and 5.4 million worksite employees in the US at the end of 2025.
This guide covers how the split of responsibility works, what a PEO costs on a real invoice, what the CPEO label means, when an employer of record (EOR) is the better tool, and how to leave a PEO. When you are ready to shortlist, our ranking of the best PEO companies compares the main providers.
What a PEO does and who is responsible for what
A PEO takes over the administrative side of employment and shares legal responsibility for it, while you keep control of the work. The rule of thumb: anything that touches the paycheck, the benefits plan or a tax filing moves to the PEO, and anything that touches the job itself stays with you.
- Hiring, promotions and terminations
- Job duties, schedules and performance
- Pay rates, raises and bonuses
- Safety on your own work sites
- Culture and daily management
- Payroll runs and payroll tax filings
- Group health, dental and retirement plans
- Workers’ comp coverage and claims
- Onboarding paperwork and HR policies
- Unemployment claims and compliance filings
Co-employment is what makes this legal, and it is also what limits it. The PEO is the employer for payroll tax and benefits purposes, but you remain responsible for workplace conduct, wage and hour decisions, and safety. A PEO can fix a payroll filing error. It cannot fix a manager’s discrimination problem. Who answers to the IRS for a missed tax deposit depends on whether the PEO is certified, which we cover below.
What a PEO package includes
A standard package covers five areas: payroll and tax filing, benefits, workers’ compensation, compliance and HR support. Extras such as recruiting, time tracking or learning tools are usually priced separately.
Payroll and taxes
Pay runs, tax deposits, year-end forms and new-hire reporting, filed under the PEO’s accounts.
Group benefits
Health, dental, vision and life plans bought at the PEO’s scale, so a 15-person company can access large-group options.
Workers’ comp
Coverage under the PEO’s policy, plus claims handling and return-to-work support.
Compliance
Handbook templates, labor law updates and registrations in the states where your people work.
HR support
A named contact or service team for onboarding, leave, terminations and employee questions.
Retirement plans
A shared 401(k). NAPEO reports 52% of PEO client employees have a retirement plan, against 23% in its small-business comparison.
Benefits are the main reason most small employers sign. The trade-off is that the plan belongs to the PEO. You choose from its menu, and when you leave, you leave the plan and usually start over on deductibles.
NAPEO also says PEO clients grow about twice as fast and are 50% less likely to fail. Those are trade-group figures, and companies choose to buy a PEO, so read them as correlation. For the wider market picture, see our roundup of PEO statistics.
PEO vs EOR vs ASO: which one fits
Use a PEO if you employ people in the US through your own company, an EOR if you hire where you have no entity, and an administrative services organization (ASO) if you want admin help without sharing employer status.
PEO
Professional employer organization- Legal employer
- Shared with your company
- Needs your entity
- Yes, in the US
- Benefits
- PEO master plan
- Best for
- US teams that want HR and benefits handled
EOR
Employer of record- Legal employer
- The EOR
- Needs your entity
- No
- Benefits
- Local, set by country
- Best for
- Hiring abroad without a local entity
ASO
Administrative services only- Legal employer
- You, alone
- Needs your entity
- Yes
- Benefits
- Your own plans
- Best for
- Teams that want software and support, not pooling
The in-house route is the other benchmark. The Bureau of Labor Statistics puts the median pay of an HR specialist at $75,940 and an HR manager at $149,280 (BLS, May 2025), before benefits and payroll taxes. A PEO does not replace a senior HR lead, but it can delay the first full-time HR hire. If you only need pay runs, payroll software costs far less. For a side-by-side with staffing agencies, read EOR vs PEO vs staffing agency.
What a PEO costs
Most PEOs charge a flat fee per employee per month (PEPM) or a percentage of payroll. Commonly quoted ranges are $40 to $160 PEPM or 2% to 12% of payroll, but treat them as rules of thumb. Quotes depend on your payroll, states, headcount and claims history.
Real list prices are rare. Justworks publishes $79 PEPM for PEO Basic and $124 for PEO Plus, with no base fee. Most others, TriNet included, quote only after a review.
The invoice below shows why headline fees mislead. It is an illustration with assumed inputs, not a quote.
One month for 25 employees (illustration)
Payroll: $125,000- PEO admin fee25 employees × $110$2,750
- Medical premiums25 × $523.60$13,090
- Workers’ comp125,000 × 0.48%$600
- Employer payroll taxes125,000 × 9.6%$12,000
Assumed rates: $110 PEPM fee, $523.60 per-employee premium, 0.48% workers’ comp rate, 9.6% payroll tax load. Real rates vary by state, carrier and job class. The fee alone is $33,000 a year.
Only the $2,750 admin fee, 10% of the invoice, is the PEO’s own charge. Premiums (46%) and payroll taxes (42%) would exist anyway, so compare the fee line item by item. Then compare the PEO’s benefits plan with what you pay today, and ask about any markup on premiums, the workers’ comp rate, setup fees, minimum monthly billing and contract length.
If you are comparing a PEO with hiring abroad, the math is different. See what an employer of record costs for EOR pricing.
CPEO status: the check to make before you sign
A certified professional employer organization (CPEO) is a PEO the IRS has certified under section 7705 of the Internal Revenue Code. For wages it pays to worksite employees, section 3511 treats the CPEO as the employer for federal employment tax, so it is generally solely liable for those taxes. With a non-certified PEO, you generally stay responsible for them.
What a CPEO must meet
Verified October 2026Source: 26 U.S.C. 7705 and IRS CPEO guidance.
The IRS public listing shows more than 100 active CPEOs, a minority of the roughly 500 PEOs NAPEO counts. Check the active list, and the separate suspended and revoked lists, before you sign.
Certification also helps in the middle of a year. Under section 3511, a CPEO is treated as a successor employer for wage base purposes, so wages you already paid can count toward the Social Security wage base ($184,500 in 2026). With a non-certified PEO, ask in writing how it handles the wage base.
ESAC accreditation is a separate, private check. ESAC says it tests more than 40 financial, ethical and operational standards and confirms licensing in each state where the PEO operates. You can search accredited PEOs at esac.org.
State rules and fine print to check
PEO rules are set mostly by states, and they vary. NAPEO told the Texas Sunset Commission in 2020 that over 40 states regulate PEOs, so confirm that your provider is licensed or registered in every state where you employ people.
Workers’ comp has its own wrinkle. Ohio, North Dakota, Washington and Wyoming bar private insurers, according to a US Department of Labor report, so coverage there runs through a state fund. Ask any PEO how it handles employees in those states.
The Affordable Care Act reporting duty also stays with you. An employer with 50 or more full-time equivalent employees is an applicable large employer, and the IRS says a third party may file for you without moving your liability. Ask who files Forms 1094-C and 1095-C, and under which EIN.
Is a PEO right for your company?
A PEO pays off when the work it takes off your plate is worth more than its fee, and that is most often true for small US teams. NAPEO’s data shows the typical client is small: 63% have fewer than 20 worksite employees, and the average is 23.2.
- You employ 5 to 100 people in the US and have no dedicated HR team.
- You want group benefits that a small group plan cannot get you.
- You employ people in several states and do not want to register and file in each one.
- You are growing faster than HR can keep up, and a full-time hire is not yet justified.
- Your employees work outside the US. Use an EOR instead.
- You already have strong benefits and an HR lead. A 10% fee may not pay for itself.
- You need full control of plan design. A PEO master plan limits your choices.
If you rule a PEO out but still need better systems, start with HR software or HRIS platforms.
How to choose a PEO
Compare PEOs on the points that change cost or risk: CPEO status, benefits fit, workers’ comp pricing, the contract exit terms and who actually answers your calls. Ask these in order.
- Is it a CPEO, and is it ESAC-accredited?
- Can we keep our current benefits carrier, or must we move to the PEO plan?
- What is the admin fee per employee, and is any benefits cost marked up?
- How is workers’ comp priced, and when does it get re-rated?
- Who files Forms 1094-C and 1095-C, and under which EIN?
- Who is our named contact, and what does onboarding involve?
- What are the term, renewal, and termination notice rules?
- What records and data do we get when we leave?
Our ranking of the best PEO companies applies these checks to the main providers. For one example of a published-price PEO, see our Justworks review, or compare it with Paychex.
Switching to a PEO and leaving one
Plan about 90 days in either direction. Moving in is mostly data and benefits enrollment. Moving out is mostly replacing the health plan, payroll setup and workers’ comp before the contract ends.
The PEO owns the health plan, so coverage ends on the termination date. Before then, line up replacement coverage, a payroll provider, workers’ comp and your own state tax accounts. Ask who issues W-2s for the year of the switch, and get your payroll history and personnel records in writing. Check the notice period in your contract first, because missing it can lock you in for another term.
PEO terms in plain English
- Co-employment
- A legal arrangement where the PEO and your company share employer duties for the same workers.
- CPEO
- A PEO certified by the IRS and held to bonding, audit and reporting rules.
- Worksite employee
- A person you manage day to day who is also on the PEO’s payroll.
- PEPM
- Per employee per month, the usual way PEO fees are quoted.
- Pass-through costs
- Premiums and taxes the PEO collects from you and pays onward.
- ASO
- An administrative services organization, which sells HR services without co-employment.
- Master plan
- The PEO’s own health plan, shared across all its clients.
- ESAC
- The Employer Services Assurance Corporation, which accredits PEOs.
Frequently Asked Questions
What is a PEO in simple terms?
A PEO is a company that becomes your co-employer. It runs payroll, taxes, benefits and workers’ comp for your team, while you keep control of hiring and daily work.
How much does a PEO cost?
Commonly quoted ranges are $40 to $160 per employee per month, or 2% to 12% of payroll. Justworks publishes $79 and $124 per employee per month for its two PEO plans. Your quote depends on payroll, states and claims history.
Is a PEO the same as an EOR?
No. A PEO co-employs people you already employ through your own US company. An EOR is the legal employer in a country where you have no entity, which is how companies hire abroad.
Who is liable for payroll taxes with a PEO?
With a CPEO, the PEO is generally solely liable for the federal employment taxes it remits on worksite employees. With a non-certified PEO, you generally stay responsible, so check the certification first.
What is the minimum company size for a PEO?
There is no legal minimum, but providers set their own. NAPEO’s data shows 17% of client businesses have one to four worksite employees, and the average client has 23.2.
Can a PEO hire employees outside the US?
Most cannot. A US PEO covers worksite employees in the US. For international hires, use an employer of record.
Do I lose control of my employees with a PEO?
No. You still decide who to hire, what they do and what they earn. The PEO takes over payroll, benefits and compliance administration.
Can I keep my current health insurance carrier?
Sometimes. Many PEOs put clients on a master plan, while some allow carrier-sponsored plans. Ask before you sign, because moving carriers resets deductibles for most employees.
