A Professional Employer Organization enters into a co-employment arrangement with your business, taking on payroll, benefits administration, and much of the compliance burden that comes with having employees. Your company still directs day-to-day work, but the PEO shares legal responsibility for HR functions. This shared structure is what makes PEOs different from a typical HR vendor.
People often confuse a PEO with an Employer of Record, and the distinction matters. Under a PEO, you remain the legal employer and share responsibilities through co-employment. Under an EOR, the provider becomes the sole legal employer, which is why EORs are common for hiring internationally without setting up a local entity.
Cost is usually the first question small business owners ask, and the honest answer is that it depends on structure. Some PEOs charge a flat fee per employee per month, others take a percentage of total payroll. For a company under 20 employees, the math often comes down to whether the bundled benefits and payroll administration would cost more to build in-house.
Liability is where a lot of business owners get nervous, and rightly so. Joining a PEO doesn't erase your responsibilities as an employer, but it does shift specific obligations, like payroll tax filing and workers' comp administration, onto the PEO under co-employment. Reading the service agreement closely matters more than most owners realize going in.
Multi-state compliance is one area where a PEO earns its cost quickly. Employment laws, tax registrations, and benefits rules shift from state to state, and keeping up with all of it internally takes real bandwidth. A PEO that already operates across multiple states brings that infrastructure with it, which is often the deciding factor for growing companies.