Many small and medium-sized businesses reach a point where managing human resources becomes a major challenge. Handling payroll, benefits, and government compliance can feel like a full-time job. This is where a Professional Employer Organization, or PEO, comes in.

The idea behind PEOs started in the late 1960s but took off in the 1980s under the name "employee leasing." The concept was simple: a business could lease its employees from another company that would handle all the administrative HR work. Over time, this model evolved into the modern PEO, which is less about leasing and more about a strategic partnership.

The PEO relationship works through a model called co-employment. This might sound complicated, but it's a straightforward division of responsibilities. When a company partners with a PEO, they enter into a co-employment agreement.

Think of it this way: you, the business owner, still hire, fire, and direct your team. You control the company culture, set salaries, and manage performance. The PEO, meanwhile, takes care of the behind-the-scenes HR administration. They process paychecks, file payroll taxes, handle workers' compensation claims, and manage health benefits.

This partnership allows business owners to focus on growing their business without getting bogged down by complex HR rules and paperwork. The employee gets the best of both worlds: the culture and direction of a small business with the robust benefits and HR support of a large enterprise.

The PEO model has become a popular solution for many American businesses. While they fly under the radar for most people, their impact is significant. As of 2017, there were 907 PEOs operating across the United States.

Together, these organizations served about 175,000 client businesses. This translated to managing the HR needs for approximately 3.7 million worksite employees. That’s a substantial portion of the workforce, highlighting just how valuable this co-employment partnership can be for small and medium-sized companies.