Co-Employment

Two meanings of co-employment

The term is used in two related ways, and it helps to know which one someone means.

The PEO model. A PEO enters a co-employment agreement with a client, usually a small or mid-sized business. The PEO becomes the employer of record for payroll, tax withholding, workers' compensation and benefits, often pooling many clients' employees to get better benefit rates. The client keeps control of hiring, daily work, pay decisions and firing. Both are employers, with the split written into a client service agreement.

The staffing and contingent workforce model. Here "co-employment" usually describes a risk rather than a chosen arrangement: a client using agency temps or contractors may, by how it treats them, become their employer too, with liability for wages, benefits, discrimination and labor law duties. In that legal sense the closer term is joint employer.

How a PEO arrangement splits responsibilities

A typical split looks like this:

• PEO: runs payroll, files and pays employment taxes, issues W-2s, administers benefits plans, provides workers' compensation coverage, and often supplies HR policies and compliance support.
• Client: recruits and hires, sets pay and job duties, supervises the work, handles performance and discipline, decides terminations, and keeps compliance duties tied to the worksite such as safety.
• Shared or negotiated: handbook policies, I-9 completion, unemployment claims, and employment practices liability.

For federal employment taxes, a PEO certified by the IRS as a Certified Professional Employer Organization (CPEO), a program created by 2014 legislation, is generally treated as solely liable for taxes on wages it pays. Non-certified PEOs do not give the client that protection. Many states also license or register PEOs.

Where co-employment risk comes from in contingent programs

The best-known example is the Microsoft "permatemp" litigation of the 1990s, Vizcaino v. Microsoft. Workers classified as freelancers and later as agency temps worked alongside employees for years, doing the same work under the same managers. The court held they were common-law employees eligible to take part in the employee stock purchase plan, and the case ended in a large settlement.

The pattern still repeats. Risk grows when contingent workers:

• Stay on the same assignment for years.
• Are interviewed, selected, disciplined or let go directly by client managers.
• Receive client performance reviews, employee-only training or company swag and events.
• Have pay rates or raises set by the client.
• Are listed in the client's org chart or employee directory.

None of these alone decides the question, but together they make a client look like the employer.

Controls large employers use

Enterprise contingent workforce programs, often run through an MSP and a VMS, use a standard set of guardrails:

1. Tenure limits. Cap assignments, for example at 12 to 24 months, followed by a break of several months, or a decision to convert the worker to an employee. Tenure limits are an imperfect control, and they cost you good workers, so set them deliberately rather than by habit.
2. Agency handles employment decisions. The client gives feedback to the agency; the agency disciplines, sets pay and ends assignments.
3. Separate identifiers. Different badge colors, email formats and directory flags.
4. Benefit plan language. Plan documents that explicitly exclude workers paid through a third party, even if later reclassified.
5. Training scope. Client provides job-specific and safety training; general HR training comes from the agency.
6. Contracts with indemnity and insurance, plus periodic audits of the agency's wage and benefits compliance.

The aim is not to avoid all control; a client must direct the work. The aim is to keep employment decisions with the employer of record.

Co-employment in high-volume hiring

A seasonal peak that brings 500 agency associates into a distribution center for four months is classic co-employment. The client should have a short supervisor guide: you direct the work and safety, you report performance and conduct issues to the agency on-site lead, you do not promise jobs, raises or conversion, and you send any complaint of harassment or injury to both HR teams the same day. Temp-to-hire programs should run conversions through a documented process with the agency, and the conversion terms belong in the staffing contract. This page is informational, not legal advice.