TL;DR\n\nA Professional Employer Organisation (PEO) is a firm that enters into a co-employment relationship with a client company, taking on responsibility for payroll, benefits administration, HR compliance, and employment tax filings on behalf of that client's workforce. The client company retains day-to-day control of employees' work. PEOs are used primarily by small and mid-size businesses that want enterprise-grade HR infrastructure without building it in-house.\n\n## How the PEO Model Works\n\nIn a PEO arrangement, the employees legally work for two employers simultaneously. The PEO is the employer of record for payroll and HR compliance purposes. The client company is the worksite employer - it controls what people do, when, and how. This co-employment structure is what gives PEOs the legal standing to administer benefits, file taxes, and handle workers' compensation on behalf of the client.\n\nThe mechanics are straightforward. The client hires someone, that person is onboarded through the PEO's systems, and payroll is processed by the PEO using the PEO's employer identification number (EIN). Benefits are offered through the PEO's group plans - which, because the PEO aggregates employees across many client companies, are typically more competitive than a small business could negotiate independently. The client pays the PEO a fee, usually 2-12% of total payroll or a flat per-employee-per-month rate.\n\nWhat the PEO handles varies by contract but typically includes: payroll processing and tax filings (federal, state, local), workers' compensation insurance, health and retirement benefits administration, employee handbook development, HR compliance advisory, and unemployment claims management. What the client retains: hiring decisions, performance management, day-to-day direction, and termination authority.\n\nPEOs are distinct from staffing agencies. A staffing agency recruits and places workers; the staffing firm is the employer of record and the client relationship is typically temporary or project-based. A PEO doesn't recruit - it administers. The client does the hiring; the PEO handles the back-office infrastructure.\n\n## Why It Matters for Recruitment\n\nFor small businesses under 100 employees, a PEO relationship directly affects recruiting competitiveness. Benefits are one of the primary factors candidates weigh against salary, and small businesses notoriously struggle to offer plans competitive with larger employers. Through a PEO, a 30-person company can offer the same Blue Cross Blue Shield group plan rates as a 500-person company. That closes a significant competitive gap in talent acquisition.\n\nCompliance risk is the other driver. Employment law changes faster than most HR generalists can track, especially for companies operating across multiple states. Misclassification, missed state tax filings, FMLA violations, and ACA compliance failures each carry substantial penalties. PEOs employ compliance specialists and carry the liability alongside the client - the co-employment structure means the PEO shares legal exposure, which creates a strong incentive for them to keep clients compliant.\n\nFor staffing agencies working with growth-stage clients, understanding PEO arrangements matters practically. A client that uses a PEO may require that placed contractors be run through the PEO's payroll rather than the agency's. It also affects how permanent placements are structured - the hiring company may onboard via the PEO immediately, changing what the agency needs to coordinate post-placement.\n\n## In Practice\n\nA 40-person healthcare SaaS company in Austin uses a PEO called Insperity to handle HR infrastructure while they scale. Their founding team is all product and engineering - nobody has HR expertise in-house. Through Insperity, they offer employees a 401(k) with employer match, comprehensive health coverage, and a PTO management system they didn't have to build themselves.\n\nWhen they use Candidately to run sourcing campaigns for senior engineering roles, candidates who ask about benefits get a clean, detailed answer - something most early-stage companies can't deliver. The PEO's benefit documentation is professional-grade. Offer acceptance rates on senior hires are higher than industry average for their stage because the total package is competitive even though the base salary is slightly below market.\n\nWhen the company eventually hires an in-house People Operations manager, they renegotiate the PEO contract, taking some functions back in-house while keeping payroll and benefits administration with the PEO. The model scales up and down without rebuilding from scratch.\n\n## Key Facts\n\n| Feature | PEO | Staffing Agency | Employer of Record (EOR) |\n|---|---|---|---|\n| Who recruits | Client company | Staffing firm | Client company |\n| Employment structure | Co-employment | Staffing firm is sole employer | EOR is sole employer |\n| Typical use case | SMB HR administration | Temp/contract staffing | International hiring, compliance in new states |\n| Benefits administration | Yes - through PEO group plans | Varies | Yes |\n| Client retains hiring authority | Yes | No | Yes |\n| Fee structure | % of payroll or PEPM | Markup on hourly rate | PEPM or % of salary |\n| NAPEO accreditation | Available (Certified PEO) | Not applicable | Not applicable |