PEO vs Staffing Agency: Different Contracts for Different Problems

A staffing agency finds workers, employs them, and assigns them to your business, usually with a markup on each hour worked. A PEO co-employs people the client already hired and administers defined payroll, benefits, workers compensation, and HR functions. Companies use staffing for labor supply and a PEO for workforce administration, and some use both.

Start with the business need. Staffing addresses recruiting and variable labor capacity. A PEO addresses administration and insurance for a workforce the client hires and manages.

Who employs whom

In a staffing arrangement, the agency is the employer: it recruits, hires, pays, insures, and can reassign the worker. Your contract is for labor supply, and the worker may never appear on your payroll at all. Temp-to-hire conversion fees are part of the model.

In a PEO arrangement, you hire and manage your people, set their pay, and decide who stays. The PEO's co-employment role covers defined administrative and program functions in the service agreement. Your workforce does not change; its back office does.

Neither label settles legal responsibility by itself. Joint employment doctrines under wage, safety, and labor law examine control over the work, and a client that directs day-to-day tasks carries employer exposure in both models. OSHA, for example, treats host employers and staffing agencies as sharing responsibility for temporary worker safety.

Cost structures are not comparable line by line

Staffing markups can bundle recruiting, employment taxes, workers compensation, benefits, and the agency's margin into one hourly price. A PEO invoice may separate wages, taxes, insurance premiums, and an administrative fee per employee or as a percentage of payroll.

That means the comparison is not markup vs fee. Compare each option against what it replaces: staffing markup vs the fully loaded cost of recruiting and employing directly, and PEO fee vs the cost of the payroll, benefits, comp, and HR administration you would otherwise run yourself.

Workers compensation flows differently

In staffing, the agency generally carries comp for its assigned workers, and its rates reflect the duties at your site. In a PEO, your workforce's class codes and claims experience drive the pricing, whether under a master policy or client-level policies depending on the state. If your interest in either model is mainly comp cost, be precise about whose loss history follows you afterward: staffing leaves no comp history in your name for the assigned workers, while PEO arrangements vary by state and structure.

Where each fits

Staffing fits variable, project-based, or hard-to-recruit labor needs: seasonal surges, backfills, roles where the agency's candidate pipeline is the product. It gets expensive as a permanent arrangement, because you pay the markup for as long as the worker stays.

A PEO fits a stable core team when its benefit options, HR support, insurance programs, or multi-state administration solve a documented need. Recruiting is generally outside the service, and the administrative fee follows the contract's employee counts or payroll basis.

Moving a long-term workforce to a staffing agency does not automatically remove the client's employer obligations, and joint-employment rules can still apply. A PEO should not be expected to supply a group of new workers on short notice.

Questions that sort the vendors quickly

• For staffing: what is the markup by role, what does temp-to-hire conversion cost, and who handles a workplace injury at our site?
• For a PEO: what is the administrative fee in dollars per employee, which insurance programs apply in our states, and what does exit look like?
• For both: which party is the employer for each specific obligation (payroll taxes, comp, benefits, terminations), in writing, per the contract rather than the pitch.