Once a client company contracts with a PEO, the PEO will then co-employ the client’s worksite employees. In the arrangement among a PEO, a work-site 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 and client company share and allocate responsibilities and liabilities. The PEO assumes much of the responsibility and liability for the business of employment, such as risk management, human resource management, and payroll and 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 work-site employees.