Once a client company contracts with a PEO, the PEO will then co-employ the client’s worksite employees. In the relationship among a PEO, a worksite employee, and a client company, there exists a co-employment relationship in which both the PEO and client company have an employment relationship with the worker. The PEO assumes responsibility and liability for the “business of employment” such as risk management, personnel management, human resource compliance, and payroll & employee tax compliance. The client company retains responsibility for and manages product development and production, business operations, marketing, sales, and service. The PEO and the client will share certain responsibilities for employment law compliance. As a co-employer, the PEO will often provide a complete human resource and benefit package for the worksite employees.