Court cases have shaped how co-employment actually works in practice—and more importantly, who gets held responsible when things go wrong. Understanding these precedents isn’t about becoming a legal expert. It’s about knowing which contract clauses matter, what liability protections actually hold up in court, and where PEO arrangements have historically fallen apart.
Most business owners sign PEO agreements focused on payroll efficiency and benefit costs. Then a dispute happens—an injury claim, a discrimination lawsuit, a wage dispute—and suddenly the question of “who’s the real employer?” becomes very expensive to answer.
The precedents below aren’t just legal history. They’re the blueprint for how liability actually gets assigned when things go sideways. They reveal which contractual protections hold up under scrutiny and which ones collapse the moment you need them most.
This guide breaks down the key rulings that directly impact your risk exposure as a client company, so you can ask better questions and negotiate smarter terms before you sign.
1. The Joint Employer Test
The Challenge It Solves
When a dispute arises—whether it’s a discrimination claim, wage violation, or injury lawsuit—courts must determine who qualifies as the employer. In PEO relationships, this isn’t straightforward. Both the PEO and the client company exercise some level of control over the worker, creating potential dual liability.
The joint employer test determines whether one party, both parties, or neither party bears legal responsibility. Getting this wrong means you could be held liable even when you thought the PEO was handling it.
The Strategy Explained
Courts apply two primary frameworks to determine employer status in co-employment arrangements: the common law control test and the economic realities test.
The common law control test focuses on who has the right to control the means and manner of work. This includes directing daily tasks, setting work schedules, providing equipment, and determining how work gets done. Under this test, the entity exercising day-to-day operational control is more likely to be deemed the employer.
The economic realities test looks at economic dependence rather than direct control. It examines factors like who determines pay rates, who has the power to hire and fire, the permanence of the relationship, and whether the work is integral to the business. This test casts a wider net and can result in joint employer findings even when operational control is limited.
Federal circuits apply these tests differently, and the Department of Labor and NLRB have issued guidance that shifts with different administrations. This creates genuine complexity for businesses operating in multiple jurisdictions.
Implementation Steps
1. Review your PEO contract to identify which employment functions the PEO controls versus which ones you retain—particularly hiring, firing, work direction, and compensation decisions.
2. Document your operational boundaries clearly in writing, including who makes final decisions on disciplinary actions, performance management, and termination.
3. Consult with employment counsel in each state where you operate to understand how local courts apply joint employer tests, since federal and state standards can diverge significantly.
Pro Tips
The more operational control you retain, the more likely you’ll be deemed a joint employer regardless of what your PEO contract says. Courts look at actual practice, not contractual language. If your managers are making day-to-day work decisions, expect to be treated as an employer in most disputes.
2. Workers’ Compensation Liability Split
The Challenge It Solves
Workers’ compensation is supposed to be straightforward: the employer carries coverage, and injured workers file claims against that policy. In PEO arrangements, this gets messy fast.
Coverage gaps emerge when there’s confusion about who the statutory employer is, when PEO policies exclude certain job classifications, or when state-specific requirements aren’t properly met. If an injured worker can’t recover from the PEO’s policy, they may sue you directly—and suddenly you’re facing litigation that workers’ comp was supposed to prevent.
The Strategy Explained
Courts have consistently held that workers’ compensation coverage must be continuous and comprehensive for all employees. When a PEO relationship creates coverage gaps—even unintentionally—the client company can be held responsible as the statutory employer.
Common scenarios where this breaks down include misclassified workers who fall outside the PEO’s policy, state-specific coverage requirements the PEO didn’t meet, and situations where the PEO’s insurer denies coverage based on contractual exclusions the client company wasn’t aware of.
The legal principle courts apply is simple: an injured worker must have access to workers’ compensation coverage. Understanding the workers comp risk transfer framework helps you identify where the PEO’s coverage might fail and leave you as the fallback responsible party.
Implementation Steps
1. Obtain a certificate of insurance directly from the PEO’s workers’ compensation carrier, and verify that all your job classifications are explicitly covered without exclusions.
2. Require the PEO to provide written confirmation that their policy meets all state-specific requirements in every jurisdiction where you have employees, including states with monopolistic funds.
3. Add a contractual requirement that the PEO must notify you immediately if their workers’ compensation coverage lapses, is cancelled, or if any claim is denied due to coverage disputes.
Pro Tips
Don’t assume the PEO’s workers’ comp coverage is airtight just because they say it is. Request quarterly verification that coverage remains active and that no claims have been denied. If you operate in multiple states, pay special attention to monopolistic state fund requirements—these can’t be outsourced to a PEO in the same way private insurance can.
3. Employment Discrimination Dual Liability
The Challenge It Solves
Discrimination claims under Title VII, the ADA, and ADEA can name multiple defendants. In PEO relationships, plaintiffs routinely sue both the PEO and the client company, arguing that both exercised sufficient control to be considered employers.
Even if the PEO handles HR policies and complaint procedures, courts often find that the client company’s operational control over daily work assignments, performance feedback, and workplace culture creates joint liability. This means you’re both on the hook for defense costs and potential damages.
The Strategy Explained
Courts apply a functional analysis to discrimination claims: they look at who had the power to prevent the discriminatory conduct. If your managers made decisions about assignments, promotions, or disciplinary actions—even if the PEO formally processed the paperwork—you’re likely to be deemed a joint employer for discrimination purposes.
The practical reality is that most discrimination happens in the day-to-day work environment, not in HR policy documents. Harassment claims, hostile work environment claims, and retaliation claims typically arise from actions taken by client company managers, not PEO staff.
This creates a situation where the PEO’s anti-discrimination policies and training programs don’t shield you from liability if your managers create a discriminatory environment. Implementing a solid employment litigation prevention strategy requires action at the operational level.
Implementation Steps
1. Negotiate clear indemnification language in your PEO contract that specifies which party bears defense costs and liability for discrimination claims based on client company management decisions versus PEO policy failures.
2. Implement your own manager training on discrimination and harassment that goes beyond the PEO’s generic programs, focusing on scenarios specific to your workplace and industry.
3. Establish a direct reporting channel for discrimination complaints that doesn’t rely solely on the PEO’s process, and document how complaints are investigated and resolved regardless of which entity receives them first.
Pro Tips
Insurance matters here more than contract language. Verify that both your general liability policy and the PEO’s EPLI coverage will respond to discrimination claims, and understand which policy is primary. Dual coverage sounds redundant until you’re facing a claim and discover the PEO’s policy excludes client company management decisions.
4. Wage and Hour Dispute Exposure
The Challenge It Solves
FLSA violations—unpaid overtime, misclassification, off-the-clock work, improper tip pooling—can result in joint employer liability even when the PEO processes payroll. Courts look at who controlled the work conditions that led to the violation, not just who cut the checks.
If your managers approved timesheets, set schedules, or directed employees to work through breaks, you’re likely a joint employer for wage and hour purposes. The PEO’s payroll processing doesn’t insulate you from liability for decisions you made about how work gets done.
The Strategy Explained
The economic realities test dominates wage and hour litigation. Courts examine who had the power to control pay rates, who determined hours worked, who set production quotas or performance standards, and who exercised hiring and firing authority.
In most PEO arrangements, the client company controls all of these factors. The PEO simply processes the payroll based on data the client provides. This means wage and hour violations typically create liability for the client company regardless of contractual language shifting responsibility to the PEO.
Misclassification cases are particularly problematic. If you treat workers as independent contractors or exempt employees when they should be classified differently, courts will hold you responsible even if the PEO didn’t flag the issue. Proper multi-state payroll compliance requires understanding these classification rules across jurisdictions.
Implementation Steps
1. Conduct an independent wage and hour audit before signing with a PEO, focusing on exempt classifications, independent contractor relationships, and timekeeping practices—don’t rely on the PEO to catch existing violations.
2. Require the PEO to provide written guidance on classification decisions for any borderline roles, and document that you followed their recommendations if they later turn out to be wrong.
3. Implement your own timekeeping oversight to ensure managers aren’t pressuring employees to work off the clock or skip breaks, since these violations happen at the operational level where the PEO has no visibility.
Pro Tips
Wage and hour class actions can name both the PEO and client as defendants, but settlement negotiations often reveal that the client company has deeper pockets and more settlement motivation. Budget for this reality when evaluating PEO liability protections. The indemnification clause won’t help if you’re the one who created the violation.
5. Termination Decision Ownership
The Challenge It Solves
Wrongful termination claims hinge on who made the decision to end the employment relationship and why. In PEO arrangements, this gets complicated when the client company decides to terminate but the PEO processes the paperwork and delivers the news.
Courts consistently hold that the entity making the substantive termination decision bears primary liability, even if another party handled administrative tasks. If your manager decided to fire someone and the PEO simply executed that decision, you’re the defendant in a wrongful termination lawsuit.
The Strategy Explained
The legal analysis focuses on decision-making authority, not administrative process. Who evaluated the employee’s performance? Who determined that termination was warranted? Who had the power to reverse the decision?
In most PEO relationships, the client company makes these calls. The PEO might review the decision for legal compliance or recommend different approaches, but the final authority rests with the client. This means wrongful termination liability follows the client company in the vast majority of cases.
Retaliation claims add another layer. If an employee engaged in protected activity—filing a workers’ comp claim, reporting harassment, requesting FMLA leave—and was subsequently terminated, courts will examine whether the client company’s decision was retaliatory regardless of the PEO’s involvement. Understanding how to use your PEO for lawsuit prevention starts with proper documentation of performance issues.
Implementation Steps
1. Establish a documented termination approval process that includes PEO review before final decisions are made, creating a paper trail that shows you sought guidance on legal compliance.
2. Require the PEO to provide written confirmation that they’ve reviewed the termination rationale and supporting documentation, and that they’ve identified any legal risks before you proceed.
3. Negotiate contractual language that clarifies the PEO will provide legal defense if they approved a termination decision that later results in litigation, not just for terminations they unilaterally recommended.
Pro Tips
The timing of termination decisions matters enormously in litigation. If an employee filed a complaint or took protected leave, and termination happened within weeks or months, you’re facing a retaliation claim regardless of the stated reason. Document performance issues in real time, not retroactively after someone becomes a legal risk. The PEO can’t fix weak documentation after the fact.
6. ERISA Fiduciary Responsibility
The Challenge It Solves
ERISA imposes fiduciary duties on entities that control employee benefit plans. In PEO relationships, determining who qualifies as a fiduciary isn’t always clear—and getting it wrong can result in personal liability for plan failures, unpaid benefits, or imprudent investment decisions.
Courts have held that the entity exercising actual control over plan assets and administrative decisions bears fiduciary responsibility, regardless of what the plan documents say. If you retain control over plan design, vendor selection, or contribution decisions, you may be a fiduciary even if the PEO is the named plan sponsor.
The Strategy Explained
ERISA distinguishes between plan sponsor duties and plan administrator duties. The plan sponsor is the entity that establishes and maintains the plan. The plan administrator is responsible for day-to-day operations and compliance.
In PEO arrangements, the PEO typically serves as the plan sponsor for purposes of offering a master benefit plan that multiple client companies participate in. However, if the client company retains discretion over which benefits to offer, contribution levels, or eligibility criteria, courts may find shared fiduciary responsibility.
Fiduciary breaches can result from excessive fees, imprudent investment options, failure to follow plan terms, or inadequate disclosure to participants. Proper accounting for benefits expenses helps you track these costs and identify potential compliance issues before they become litigation.
Implementation Steps
1. Obtain a copy of the PEO’s ERISA bond and fiduciary liability insurance, and verify that client companies are covered for fiduciary breaches arising from plan administration failures.
2. Document in writing which benefit decisions you control versus which ones the PEO controls, including vendor selection, plan design changes, and investment menu options for retirement plans.
3. Require the PEO to provide annual ERISA compliance certifications confirming that all required testing, reporting, and disclosure obligations have been met for the benefit plans you participate in.
Pro Tips
ERISA litigation is expensive even when you win. Defense costs alone can reach six figures for complex fiduciary breach claims. If your PEO offers a 401(k) plan, pay close attention to the investment menu and fee structure. Participants are increasingly filing lawsuits over excessive fees and imprudent investment options, and courts are willing to hold fiduciaries accountable even for decisions that seemed reasonable at the time.
7. State-Specific Ruling Variations
The Challenge It Solves
Federal employment law creates a baseline, but state courts often apply different standards for determining employer status, liability allocation, and contractual enforceability. If you operate in multiple states, a PEO contract that works well under one state’s law may leave you exposed in another.
State PEO licensing laws, which now exist in most states, also affect how courts view the legitimacy and legal standing of the co-employment relationship. Some states impose specific requirements on PEO contracts, liability allocation, and client company responsibilities that override what your agreement says.
The Strategy Explained
State courts have diverged from federal standards in several key areas. Some states apply more expansive joint employer tests that make it easier for workers to establish dual liability. Others have enacted statutes that explicitly define PEO relationships and allocate specific responsibilities between PEOs and client companies.
California, New York, Texas, and Florida have particularly well-developed bodies of case law addressing PEO liability issues. These states have large PEO markets and have seen significant litigation over co-employment disputes, creating precedents that don’t necessarily align with federal standards. Conducting a thorough state employment law risk review before signing helps identify these jurisdiction-specific exposures.
State licensing requirements can also impact enforceability of PEO contracts. If your PEO isn’t properly licensed in a state where you have employees, courts may refuse to enforce indemnification clauses or liability waivers, leaving you without the contractual protections you thought you had.
Implementation Steps
1. Verify that your PEO is properly licensed in every state where you have employees, and obtain proof of current licensure rather than relying on their representations.
2. Have employment counsel in your primary operating states review your PEO contract to identify provisions that may not be enforceable under state law, particularly indemnification and liability waiver clauses.
3. For multi-state operations, require the PEO to provide state-specific guidance on employment law compliance rather than generic national guidance, since state law variations often matter more than federal requirements.
Pro Tips
If you’re expanding into new states, don’t assume your existing PEO relationship will work the same way everywhere. Some states impose joint and several liability for specific obligations regardless of contractual language. Others require specific insurance coverage or bonding that your PEO may not carry. The time to discover these gaps is before you hire employees in a new state, not after a dispute arises.
Making Informed Decisions
These precedents aren’t just legal history—they’re the blueprint for how liability actually gets assigned when disputes arise. The businesses that avoid co-employment headaches aren’t necessarily the ones with the best lawyers. They’re the ones who asked the right questions before signing.
Before you sign or renew any PEO agreement, use these rulings as a checklist. Does the contract clearly define control boundaries between you and the PEO? Are indemnification clauses specific enough to hold up when tested in court? Does the PEO’s insurance coverage actually extend to your risk profile across all the states where you operate?
Pay particular attention to areas where you retain operational control—hiring decisions, daily work direction, termination authority, workplace culture. These are the areas where liability consistently follows the client company regardless of contractual language. No indemnification clause will protect you from violations you created through your own management decisions.
Verify insurance coverage independently. Don’t rely on the PEO’s assurances that “everything is covered.” Obtain certificates of insurance, review policy exclusions, and understand which coverage is primary when both you and the PEO have potentially applicable policies.
Before you sign that PEO renewal, make sure you’re not leaving money on the table. Many businesses unknowingly overpay because of bundled fees, hidden administrative markups, and contracts designed to limit flexibility. We give you a clear, side-by-side breakdown of pricing, services, and contract terms—so you can see exactly what you’re paying for and choose the option that truly fits your business.
