What is a PEO?

The mechanics, precisely

Co-employment is a specific legal arrangement, not a service tier. Under it, two entities hold employer responsibilities for the same worker at the same time, divided by a client service agreement. The PEO takes on the administrative and statutory employer functions. You retain the worksite employer functions — direction, supervision, and the day-to-day reality of the job.

In practice that means your employees are paid under the PEO’s federal employer identification number rather than yours. Payroll taxes are remitted by the PEO. Benefit plans are sponsored by the PEO, which is what allows your employees into a much larger pooled population than your headcount alone would reach. Workers’ compensation typically moves onto the PEO’s policy.

What co-employment does not move

This is the part most often misunderstood, usually because the phrase "the PEO handles compliance" is doing a great deal of unexamined work in sales conversations.

You still decide who is hired, what they are paid, how they are supervised, whether they are disciplined and whether they stay. The liability attached to those decisions stays substantially with you — discrimination, harassment, wrongful termination, and much of the wage-and-hour exposure that arises from how the operation is actually run. A PEO can give you better process and better documentation, which genuinely reduces risk. It does not transfer the underlying obligation.

Read the client service agreement, not the summary of it. The categories it draws are the entire substance of the arrangement.

Why an employer would want this

Three reasons, in roughly the order they matter. Pooled purchasing, which can reach plan designs and workers’ comp rates a company of a few hundred people cannot buy directly. Administrative absorption, which removes payroll processing, filings and benefits administration from a team that is usually already at capacity. And a compliance floor, because a competent PEO has seen every state registration question before and your team has not.

The value of the first depends entirely on where your rates already sit. An employer with unfavourable claims experience or no access to good plan design gains a lot. An employer already buying well, with a stable carrier relationship and a favorable demographic, may find pooling is a lateral move or worse. Which of those you are is knowable before you shop, and it changes how every subsequent quote should be read.

Where it goes wrong

The most common failure is entering on a renewal deadline. A punishing renewal arrives in October, a conversation starts in November, a January effective date compresses everything, and the structural question never gets examined because there is no calendar room to examine it.

The second is not pricing the exit. Every arrangement ends eventually — through growth, acquisition, or dissatisfaction. Leaving means re-establishing payroll under your own FEIN, standing up benefit plans mid-year, re-underwriting workers’ compensation, and, depending on the provider’s certification status and how the transition is structured, potentially restarting Social Security and FUTA wage bases for every employee. That last item carries a real dollar figure and it belongs in the entry analysis.

Who it is a poor fit for

Government contractors with flow-down obligations, employers with collective bargaining agreements, businesses whose customer contracts name the employing entity, and anyone mid-transaction who needs the corporate and employment structures to stay legible to a buyer. Any one of those can decide the question on its own, before price is discussed at all.