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Three terms keep showing up when companies start hiring people they cannot easily put on their own payroll: PEO, EOR, and staffing agency. They sound similar, vendors pitch them as alternatives, and most hiring managers cannot describe the difference in one sentence. The choices have different tax, insurance, and operational consequences. Pick the wrong one and you are paying for a model that does not match your situation.
This article walks through what each of the three actually is, what they cost, when each is the right call, and how to combine them in a multi-state or multi-country footprint.
The One-Paragraph Version
A PEO (Professional Employer Organization) co-employs your workers inside an existing entity you operate (typically a US C-corp, S-corp, or LLC). The PEO becomes the employer of record for tax filings, benefits administration, and workers’ compensation, while you remain the employer for hiring, firing, and direction of work. An EOR (Employer of Record) is the sole legal employer of your worker in a country or state where you have no entity. The EOR signs the employment contract, runs payroll, and carries the legal employer relationship. A staffing agency employs its own workers and assigns them to your worksite under a temp, temp-to-hire, or contract arrangement; you direct the work day to day, but the agency is the employer of record on its own roster.
One model needs your entity (PEO). One eliminates the need for your entity (EOR). One supplies the worker from the agency’s bench (staffing agency). The differences flow from there.
What a PEO Actually Does
A PEO is a co-employment service used almost exclusively in the United States. You sign a Client Service Agreement with the PEO. The PEO files payroll taxes under its own federal employer identification number, administers a master health plan and 401(k), runs payroll, manages workers’ compensation insurance, and handles employment-tax compliance across the states where you have employees. You retain control over hiring, performance management, role design, and termination. Both you and the PEO are joint employers under the agreement.
You must already operate a US entity in the state where the worker lives. The PEO does not let you skip incorporation. Pricing is usually a per-employee per-month fee (commonly $80 to $200) or a percentage of payroll (2% to 6%), with health insurance and 401(k) typically pass-through at the PEO’s negotiated rates. Big names in this space include TriNet, Insperity, Justworks, ADP TotalSource, Gusto Embedded PEO, and Rippling PEO.
The pitch is simple: a 30-person company gets the benefits, insurance, and HR-tech stack of a 3,000-person company by joining the PEO’s master plan and master payroll.
What an EOR Actually Does
An EOR is the legal employer of your worker in a country or state where you have no entity. The EOR or its in-country partner signs the local employment contract, registers the worker with the relevant tax and social-security authorities, runs payroll under the EOR’s own employer numbers, contributes to statutory benefits, and handles termination under local labor law. You direct the work and pay the EOR a flat fee per employee per month, plus the gross salary and the country’s mandatory employer contributions.
The EOR is the right tool when the answer to “do you have a legal entity in this country” is no. It avoids incorporation, gets the worker payroll-ready in days rather than months, and removes misclassification and permanent-establishment risk. An EOR is widely used by companies hiring across borders without standing up local entities.
Pricing is usually a flat $400 to $700 per employee per month, plus gross salary, plus statutory employer contributions (often 15% to 35% of gross depending on country).
What a Staffing Agency Actually Does
A staffing agency runs its own workforce and assigns workers to your worksite (or remote work for your team) under a commercial supply agreement. The agency is the employer: it sources, recruits, employs, pays, and manages benefits and insurance. You pay the agency an hourly bill rate that includes the worker’s wage, the agency’s costs, and the agency’s margin. Common engagement types: temp (short-term, returns to the agency afterward), temp-to-hire (option to convert to your direct payroll after a trial), and contract (longer engagements with no conversion path).
Staffing agencies cluster around specific industries: light industrial (Adecco, Manpower), professional and IT (Robert Half, Kforce, Insight Global), healthcare (Cross Country, AMN), and creative (Aquent, 24 Seven). Markup typically lands at 25% to 60% over the worker’s wage rate, depending on industry, job category, and engagement length.
The defining feature is that the agency owns the supply. You are buying labor as a service. The worker may be on the agency’s payroll for years across multiple client assignments.
Side-by-Side Comparison
The table below maps the three models against the dimensions that finance, legal, and HR usually want to compare.
| Dimension | PEO | EOR | Staffing Agency |
|---|---|---|---|
| Legal employer | Co-employer with your entity | EOR or its local entity | The agency |
| Your entity required | Yes | No | No |
| Geography | US-only | Global | Country-specific |
| Worker source | You hire them | You hire them | Agency supplies them |
| Pricing | $80 to $200 per employee per month, or 2% to 6% of payroll | $400 to $700 per employee per month plus gross plus statutory | 25% to 60% markup on hourly bill rate |
| Benefits | PEO master plan (group rates) | Local statutory benefits per country | Agency’s plan, often minimal |
| Direction of work | You | You | You at worksite, agency administratively |
| Best for | US small business wanting big-company benefits | International hire with no local entity | Temp coverage, peak load, specialist supply |
The Legal-Employer Question
Across all three models the question that decides the right route is the same: who is the employer of the worker for tax, benefits, and statutory purposes? With a PEO it is a joint relationship, you and the PEO together. With an EOR it is the EOR alone. With a staffing agency it is the agency alone.
The downstream consequences flow from there. Joint employers (PEO) means you still need an entity, you still face direct claims from the worker, and you still have the bulk of HR responsibility. Sole legal employer (EOR or staffing agency) means you carry contractual obligations to the EOR or agency, but the worker’s employment claims (wage and hour, wrongful termination, statutory benefits) flow to that party first.
Cost: How the Three Actually Price
For a 25-person US workforce already on your own payroll, a PEO is a near-direct overlay. PEO fees of $100 per employee per month run roughly $30,000 per year on top of your existing payroll cost. Health insurance and 401(k) contributions are usually similar to or slightly cheaper than what you could buy directly, sometimes meaningfully cheaper for very small employers.
For a single full-time engineer in a foreign country at $5,000 monthly gross, an EOR runs roughly $5,000 + $1,000 statutory + $500 EOR fee = $6,500 per month. Standing up a local entity for one or two people is rarely cheaper.
For a temp light-industrial worker at $20 per hour through a staffing agency at 50% markup, the bill rate to you is $30 per hour. Over 2,000 hours per year, that is $60,000 (vs $40,000 if the worker were on your direct payroll, plus benefits and employer taxes). Staffing makes sense when the role is genuinely temporary, when peak demand requires a body for three months, or when the agency provides specialist supply you cannot easily source.
When a PEO is the Right Call
A PEO fits a US small business that already has an entity, wants to give employees better benefits than it could buy alone, and wants to outsource the operational HR (payroll tax filings, workers’ comp claims, ACA compliance, multi-state registration). Common signals: 5 to 100 US employees, single or multi-state operations, founders who want to focus on the business rather than HR administration, and a benefits gap that the team is starting to feel against larger competitors.
A PEO is not a way to enter a new state without registering. The PEO requires you to register as an employer in any state where you have employees. The PEO simplifies administration; it does not eliminate state-by-state employment compliance.
When an EOR is the Right Call
An EOR fits when you want to hire in a country or state where you have no entity. Common signals: hiring your first international employee, testing demand in a new market, putting one country lead in place without committing to incorporation, hiring a remote engineer in a country where your primary entity is in another, or winding down a small market and wanting to offload the termination administration. For most companies under 100 employees making their first international hires, an EOR plus a US-domestic payroll setup (or PEO if you want US benefits depth) is the simplest operating model.
When a Staffing Agency is the Right Call
A staffing agency fits when you need genuine temp coverage, peak-load capacity, or specialist supply you cannot source on your own. Common scenarios: warehousing covering a holiday peak, a customer support team scaling for a product launch, a hospital system covering nurse shortages, a creative team filling a copywriting sprint, or a software team needing a SAP implementation specialist for six months. The staffing agency owns the supply chain and the recruiting. You pay the markup for not having to find the worker yourself.
For permanent hires you intend to keep on your team for years, the staffing route is expensive. The markup compounds and the worker often does not feel like part of your team. Most companies use staffing for the first three to twelve months and then convert promising workers to direct hires (a temp-to-hire arrangement).
The Hybrid: Companies Often Use More Than One
The most common operating pattern at growth-stage US-headquartered companies looks like this. They run their US W-2 employees through a PEO for benefits depth and HR consolidation. They use an EOR for international hires across the countries where they have no entity. They use staffing agencies tactically for genuine temp coverage and specialist short-term supply. None of the three substitutes for the others. They serve different problems and the right answer for any specific role depends on the role’s nature, geography, and duration.
Decision Framework
Walk through these questions for any specific hiring scenario:
- Where does the worker live? If the employee is located where you already have a legal entity, a PEO may work well. If the worker is in a country or state where you do not have an entity, an EOR is usually the cleaner solution. For temporary roles, a staffing agency may also fit.
- How long will the engagement last? Permanent roles often favor a PEO or EOR structure. Mid-term projects can work under any model, while very short-term engagements are commonly handled through staffing agencies for operational simplicity.
- Are you trying to offer stronger employee benefits? A PEO can provide access to broader or more competitive benefits packages if you already operate through a local entity.
- Are you entering a new country without incorporating locally? An EOR is typically the fastest and most compliant option for international hiring without establishing a legal entity.
- Do you need workers immediately from an existing talent pool? Staffing agencies are often the best option when speed matters and you want access to pre-screened or readily available candidates.
The Bottom Line
A PEO is a co-employment overlay for US small businesses that already have an entity. An EOR is the sole legal employer in a country or state where you have no entity. A staffing agency supplies you with workers from its own roster. The three models do not compete for the same role. The right question is which one fits the specific hire in front of you, and most growing companies end up using more than one across their footprint. If you’re mapping which model goes where as you scale, our global recruitment strategy playbook walks through that decision country by country.
Frequently Asked Questions
A PEO co-employs your US workers inside an entity you already operate. The PEO files payroll taxes under its own EIN, runs benefits, and handles workers' comp; you keep direction of work. An EOR is the sole legal employer of your worker in a country or state where you have no entity. The EOR signs the contract, runs payroll, and carries employer liability. A staffing agency employs its own workers and assigns them to your worksite under a temp or contract arrangement. The agency owns the supply chain and bills you an hourly rate plus markup.
No. PEOs are a US co-employment model. The arrangement requires you to operate a US entity in the state where the worker lives. PEOs do not employ workers internationally and do not carry the legal employer relationship in foreign countries. Some PEO providers (Justworks, Rippling, Deel) sell separate EOR services alongside their PEO product, but the two are different commercial offerings under different contracts. If you are hiring in a country where you have no entity, you need an EOR, not a PEO.
PEO pricing is typically $80 to $200 per employee per month, or 2% to 6% of payroll, with health insurance and 401(k) contributions pass-through at the PEO's negotiated rates. EOR pricing is a flat $400 to $700 per employee per month on top of gross salary and statutory employer contributions (commonly 15% to 35% of gross). The PEO is cheaper per head because you already operate the entity, and the PEO is overlaying admin and benefits onto an existing payroll. The EOR is the only legal way to hire where you have no entity, and the higher fee reflects the legal employment service.
Staffing agencies make sense for genuinely temporary work, peak-load coverage, and specialist supply you cannot source on your own. Common scenarios include warehouse capacity over a holiday peak, customer support scaling for a product launch, healthcare covering nurse shortages, and IT projects needing a six-month implementation specialist. The agency owns sourcing, recruiting, and employment; you direct the work day to day. Markup typically lands at 25% to 60% over the worker's wage rate. For permanent roles you intend to keep for years, staffing is expensive and the worker often does not integrate as a team member.
In a PEO arrangement, your entity and the PEO are joint employers. The PEO is the employer for tax, benefits, and workers' comp purposes; your entity is the employer for hiring, performance, and direction of work. In an EOR arrangement, the EOR or its in-country partner is the sole legal employer. In a staffing agency arrangement, the agency is the sole employer of the worker. The classification affects who carries liability for misclassification, wrongful termination, statutory benefits, wage and hour claims, and workers' comp insurance.
Yes, and many growth-stage companies do. The common pattern: a PEO for the US W-2 workforce to consolidate benefits and administration, an EOR for international hires in countries where there is no entity, and tactical staffing agency engagements for genuine temp coverage or specialist short-term supply. The three models address different problems. None of them substitutes for the others. The right model for any specific role depends on geography, duration, and whether your company already operates an entity in the worker's country.
Domestic PEOs are US-only. The co-employment model is built around the US Internal Revenue Code, ERISA, and state-by-state employment registration. A PEO cannot become the employer of record for a worker in Germany, India, Brazil, or any other non-US country. Some PEO brands also sell international EOR services under the same parent (Justworks International, Rippling EOR, Deel EOR), but those are EOR contracts, not PEO co-employment. If you see "global PEO" marketing, look at the underlying contract: in most cases it is an EOR engagement.
Start with geography. Worker is in a US state where you operate an entity: a PEO is an option. Worker is in a foreign country or a US state without your entity: an EOR. Then consider duration. Permanent role: PEO or EOR depending on geography. Three to twelve months: any of the three. Under three months: staffing usually wins on operational simplicity. Finally consider sourcing. If you need someone already on the agency's bench, that's staffing. If you have your own candidate, it's PEO or EOR.
