Federal Moment, California Reality
Joint employer liability is having a moment at the federal level. Proposed Department of Labor rules, shifting National Labor Relations Board standards, and ongoing litigation are all pulling on the same thread: when does one company become responsible for another company’s workers?

For California employers, though, this is not new territory. It is an established and expanding risk, grounded in a framework that looks past formal structures and focuses on how work actually gets done.

The federal conversation matters because it signals where enforcement may be headed. But California has long applied a broader, more practical definition of employment. In Martinez v. Combs, the California Supreme Court made clear that an entity can be an employer if it exercises control over wages, hours, or working conditions, or if it “suffers or permits” work to occur. That last concept is where the analysis shifts. It captures situations where a company may not directly hire or pay workers but still allows work to happen within its operations.

The Structure Looks Clean, But There’s Risk.
Most joint employer issues arise from routine business models. Staffing agencies, subcontractors, franchise relationships, and vendor arrangements are all part of modern operations. On paper, these relationships are carefully structured. Contracts assign responsibility, allocate risk, and identify who the employer is supposed to be. But California does not stop at the contract. It asks a more practical question: who is actually controlling the work?

Consider a company that brings in temporary workers through a staffing agency. The agency runs payroll and maintains the personnel files. The agreement clearly states that the agency is the employer. But inside the workplace, the host company sets schedules, directs tasks, evaluates performance, and decides whether a worker stays or goes. When wage and hour problems surface, the host company points back to the agency.

That argument rarely carries the day. When a company controls how work is performed, it becomes difficult to claim distance from the legal obligations tied to that work. California’s approach is grounded in reality, not labels.

Federal Shifts Do Not Narrow California Risk
Federal developments reinforce the importance of this issue, even if they do not fully define it for California employers. The Department of Labor has signaled a broader view of joint employment under the Fair Labor Standards Act, and the National Labor Relations Board continues to revisit its own standards. Litigation involving companies like Google and affiliated worker groups, now before the Ninth Circuit, reflects how unsettled the doctrine remains at the federal level.

But even at its most expansive, federal law often centers on control that is direct, indirect, or reserved. California does not require that level of formality. Practical control, awareness of how work is performed, and/or allowing work to occur within the company’s business operations can be enough.

Where Employers Miscalculate
The instinct is to treat joint employer liability as a legal classification issue. If the contract is clear, the thinking goes, the risk is contained. In practice, liability develops through operational decisions made every day. Who trains the workers. Who sets schedules. Who approves overtime. Who enforces policies. Who has the authority to remove a worker from the site. Each of these decisions reflects control, and each one moves the analysis closer to joint employment.

Another common gap is failing to assess wage and hour compliance in third-party relationships. California’s requirements around meal and rest breaks, regular rate calculations, and expense reimbursement are complex and strictly enforced. If those obligations are not met, and the host organization is involved in the work, exposure follows. The fact that another entity issued the paycheck does not end the inquiry.

The Cost of Getting It Wrong
Joint employer findings expand liability across multiple entities, often turning a contained issue into a broader one. Wage and hour violations can trigger statutory penalties, waiting time penalties, and claims under the Private Attorneys General Act. What begins as a single compliance failure can scale quickly, particularly when the same practices affect a group of workers.

The risk is also cumulative. These relationships are not static. As businesses integrate operations, rely more heavily on vendors, or respond to operational pressures, the level of control can shift. A relationship that began as arms-length can become closely managed over time, bringing with it a different level of legal exposure.

What Should California Employers Do?
A more effective approach starts with recognizing that joint employer liability is operational, not just contractual. Agreements still matter, but they need to align with reality. If a company intends to maintain distance from the workers of another entity, its practices must reflect that intent. If business needs require a more hands-on approach, the legal risk should be acknowledged and managed accordingly.

That management includes understanding how work is actually performed, not just how it is supposed to be performed. It means evaluating vendor relationships with a focus on compliance, not just cost or efficiency. It requires ongoing attention, becauseor the facts that drive joint employer analysis do not remain fixed.

California’s framework leaves little room for assumptions. The question is not who the employer is on paper. It is who is acting like an employer in practice.