Co-employment risk is the exposure your company takes on when it shares enough control over workers with another business — typically a staffing agency, subcontractor, or franchisee — that federal law treats both of you as their employer. The consequences are joint liability for unpaid wages, OSHA citations, potential benefit plan obligations, union bargaining duties, and discrimination claims. The trigger is not what your contract says. It is what your managers actually do on the ground.
What Triggers Joint Employer Status
Every federal test asks the same underlying question: does the second company exercise meaningful control over the terms of employment? A written agreement that disclaims any employment relationship carries little weight when on-site managers assign daily tasks, approve time off, or decide which workers stay and which get sent back.
Two current standards illustrate the point. As of February 26, 2026, the National Labor Relations Board applies its reinstated 2020 rule, which requires a company to actually exercise “substantial direct and immediate control” over essential employment terms — wages, benefits, hours, hiring and firing, discipline, and day-to-day supervision — before it can be found a joint employer. Merely reserving the right to control in a contract is not enough on its own; reserved or indirect authority counts only as supplemental evidence.1National Labor Relations Board. The Standard for Determining Joint-Employer Status – Final Rule
The Department of Labor published a proposed rule in April 2026 that would apply a four-factor test under the Fair Labor Standards Act, looking at whether the potential joint employer hires or fires workers, supervises schedules or working conditions to a substantial degree, sets the rate and method of pay, and maintains employment records. The proposal also treats reserved contractual authority as less indicative than control actually exercised.2U.S. Department of Labor. Notice of Proposed Rule: Joint Employer Status Under the Fair Labor Standards Act, FMLA, and MSPA The rule has not been finalized, so courts continue applying their own economic realities tests and results vary by circuit.
Different agencies, similar logic. Setting a cost-plus contract or imposing brand standards does not trigger liability. Personally deciding which individuals to hire or directly setting their schedules does.
Wage and Overtime Liability
Joint employers under the FLSA are jointly and severally liable for all wages owed. A worker shortchanged on minimum wage or overtime can collect the full amount from either business, or both.3U.S. Department of Labor. Notice of Proposed Rulemaking on Joint Employer Status Under the FLSA Federal minimum wage remains $7.25 per hour, and overtime is required at one and one-half times the regular rate for hours beyond 40 in a workweek.4Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours
Hours worked for joint employers during a workweek are aggregated. A worker sent to a client site for 30 hours and assigned 15 more hours at a related entity has worked 45 hours, and five of them require overtime pay. Both employers owe it.
The financial exposure runs beyond the missing wages. Under 29 U.S.C. § 216, an employer that violates minimum wage or overtime rules owes the unpaid amount plus an equal amount in liquidated damages, effectively doubling the bill, and the court awards reasonable attorney’s fees and costs on top.5Office of the Law Revision Counsel. 29 USC 216 – Penalties Across a collective action of dozens or hundreds of workers, a modest per-worker shortfall becomes a seven-figure liability.
Both parties also share record-keeping duties. Federal regulations require payroll records to be preserved for at least three years from the last date of entry.6eCFR. 29 CFR 516.5 – Records to Be Preserved 3 Years When the staffing agency’s records are sloppy and the client kept none at all, neither can point to the other as a defense.
FMLA Headcount and Leave Duties
Jointly employed workers must be counted by both employers when determining whether the 50-employee threshold for FMLA coverage has been met. Workers who never appear on your payroll still count toward your headcount.7U.S. Department of Labor. Fact Sheet 28N – Joint Employment and Primary and Secondary Employer Responsibilities Under the FMLA A business with 40 direct employees and a dozen staffing agency workers at its facility may cross the threshold without realizing it and become subject to FMLA requirements it never planned for.
Responsibilities split between the two. The primary employer, usually the staffing agency, provides the leave, sends required notices, maintains group health coverage during the leave, and restores the worker to the same or an equivalent position on return. The secondary employer cannot interfere with the worker’s right to take leave and cannot retaliate. If it keeps using the agency and the agency places the returning worker back at the same site, the secondary employer must accept the worker into the same or an equivalent role.7U.S. Department of Labor. Fact Sheet 28N – Joint Employment and Primary and Secondary Employer Responsibilities Under the FMLA
Workplace Safety and Injury Coverage
OSHA treats staffing agencies and host employers as jointly responsible for the safety of temporary workers. Both must ensure the workplace meets safety standards, identify hazards, and provide required protective equipment. OSHA can cite and fine both companies for a single violation.8Occupational Safety and Health Administration. Protecting Temporary Workers – Section: Joint Responsibility The most recent published penalty amounts set the maximum at $16,550 per serious violation, with willful or repeated violations reaching over $165,000 each, adjusted annually for inflation.9Occupational Safety and Health Administration. OSHA Penalties
Training responsibilities divide along a line of who controls what. The staffing agency handles general safety training — recognizing common hazards, understanding reporting procedures, knowing worker rights. The host employer handles site-specific training because it controls the machinery, equipment, and particular conditions on-site. Neither company can avoid its share by claiming the other was supposed to cover it. The staffing agency also carries an oversight duty: it must have a reasonable basis for believing the host’s site-specific training is adequate, and if not, it must fix the training, provide it directly, or pull its workers from the site.10Occupational Safety and Health Administration. Temporary Worker Initiative – Safety and Health Training
Workers’ compensation adds another layer. A client company may be considered a “special employer” and share responsibility for ensuring coverage is in place. If the staffing agency lets its workers’ compensation insurance lapse, the client may become directly liable for the injured worker’s medical bills and lost wages. Indemnity clauses in the staffing agreement offer some protection but do not override the statutory obligation to maintain coverage, and a clause shifting all liability to an insolvent staffing agency is worth nothing.
Benefits and Tax Exposure
The tax code creates a separate layer of co-employment risk through its leased employee rules. Under 26 U.S.C. § 414(n), a worker who provides services to a company under an agreement with a staffing agency, has done so on a substantially full-time basis for at least one year, and performs work under the primary direction or control of the client is treated as that client’s employee for benefit plan purposes.11Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules
The practical consequence is that those workers may need to be included in the client company’s 401(k), health plan, or other benefit programs. Excluding them can disqualify the plan for the entire workforce. A safe harbor exists when the leasing organization maintains its own money purchase pension plan with at least a 10% employer contribution, full and immediate vesting, and immediate participation, but only when leased employees make up no more than 20% of the client’s non-highly-compensated workforce.11Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules
The Affordable Care Act’s employer mandate applies to any applicable large employer with 50 or more full-time employees, including full-time equivalents. Workers in a joint employment arrangement count toward this threshold, meaning a company that would not otherwise qualify as a large employer could trigger mandate obligations because of staffing workers at its facilities.12Internal Revenue Service. Questions and Answers on Employer Shared Responsibility Provisions Under the Affordable Care Act For 2026, penalties reach $3,340 per full-time employee under Section 4980H(a) when coverage is not offered to at least 95% of full-time employees, and $5,010 per employee who receives a marketplace subsidy under Section 4980H(b) when coverage is offered but is unaffordable or fails to provide minimum value. These are assessed annually per employee and scale quickly.
Payroll tax reassessment is a further risk. If the IRS concludes that workers treated as the staffing agency’s employees were common-law employees of the client, the client owes the employer’s share of FICA taxes, federal income tax withholding, and federal unemployment taxes, plus interest and penalties. Section 3509 provides reduced penalty rates when the employer had a reasonable basis for the misclassification, but the assessment still reaches thousands of dollars per worker. When the IRS finds the misclassification intentional, the reduced rates disappear and the full tax liability applies.
Union Bargaining Obligations
When the NLRB finds a joint employer relationship, the secondary company must bargain with the union over any essential employment terms it controls. Under the current 2020 standard, the bargaining obligation attaches only to those specific terms the joint employer actually exercises substantial direct and immediate control over, plus any other mandatory bargaining subjects within its authority.1National Labor Relations Board. The Standard for Determining Joint-Employer Status – Final Rule
A client can find itself at the bargaining table over wages or scheduling for workers it considered the staffing agency’s problem. Refusing to bargain once a joint employer finding is made is an unfair labor practice, which exposes the company to NLRB orders, back-pay remedies, and the cost of defending a complaint.
Title VII Discrimination Claims
The EEOC applies its own joint employer analysis when enforcing Title VII, focused on which entities exercise meaningful control over employment terms.13U.S. Equal Employment Opportunity Commission. Brief of the EEOC as Amicus Curiae in Support of Respondent/Cross-Petitioner Where a joint employment relationship exists, a client can be held liable for harassment or discrimination committed by its own managers against staffing agency workers, and in some cases for failing to address the conduct of the agency’s supervisors on its premises.
Compensatory and punitive damages under Title VII are capped by employer size. The maximum combined cap is $300,000 for employers with more than 500 employees, scaling down to $50,000 for employers with 15 to 100 employees.14Office of the Law Revision Counsel. 42 USC 1981a – Damages in Cases of Intentional Discrimination in Employment The caps apply per complaining party, so a pattern of discrimination affecting multiple workers produces aggregate exposure well beyond the per-person limits. Back pay and front pay are calculated separately and are not capped.
How to Limit the Risk
Contracts cannot eliminate joint employer status because the determination rests on conduct rather than paperwork. Well-drafted agreements can still reduce the likelihood of a finding and clarify who bears financial responsibility when problems arise.
Keep the roles distinct. The staffing agreement should assign human resources functions — recruiting, hiring, discipline, termination, and setting pay rates — to the staffing agency. The client retains operational control over where and when work gets done but stays out of individual personnel decisions. When a client starts interviewing staffing agency candidates, setting their pay, or firing them directly, it erases the line the contract was meant to hold.
Indemnity clauses matter, but the ones that try to push every risk onto the staffing agency regardless of fault are often unenforceable and breed a false sense of security. A better structure allocates specific risks to the party that controls them: the staffing agency indemnifies for payroll and benefits compliance, the client indemnifies for site safety and the conduct of its own managers. Each party manages the risks it can actually prevent.
Audit compliance periodically. Verify that the staffing agency carries current workers’ compensation and employment practices liability insurance. Confirm that payroll records are being kept properly. Watch how on-site supervisors actually interact with temporary workers. The NLRB, DOL, and OSHA will all judge the relationship by what happens on the floor, not what the agreement says in a filing cabinet.