Co-Employment

What Is Co-Employment?

 

In brief: Co-employment is a legal arrangement where two entities simultaneously hold employer status for the same worker. One entity, typically a staffing agency or Professional Employer Organization, handles HR administration, payroll, and compliance. The other, the client company, directs the worker’s day-to-day tasks. Both share employer obligations and legal exposure, which is the defining risk of the model.

 

How Co-Employment Works?

 

Co-employment arises when two organizations both qualify as the employer of the same worker under applicable law. Neither organization is the exclusive employer. Each holds a defined set of employer rights and obligations, and each can be held liable for failures within its sphere of responsibility.

The most common co-employment structures are the Professional Employer Organization (PEO) model and temporary staffing arrangements. In a PEO relationship, the PEO co-employs the client company’s workforce: the PEO manages payroll, benefits, and HR compliance while the client controls the work. In a staffing arrangement, a staffing agency places a worker at a client site: the agency is the employer of record for payroll and benefits, while the client directs the worker’s activities.

 

The Three-Party Structure

 

Co-employment involves three parties: the worker, the administrative employer (the PEO or staffing agency), and the worksite employer (the client company). The administrative employer signs the employment contract with the worker, processes payroll, withholds taxes, manages benefits enrollment, and handles HR compliance filings. The worksite employer controls the work: setting tasks, managing performance, determining schedules, and making decisions about the worker’s day-to-day role.

Each party’s obligations are defined in two contracts: the employment agreement between the administrative employer and the worker, and the client services agreement between the administrative employer and the worksite employer. The client services agreement is the document that allocates liability, defines the scope of each party’s obligations, and sets out the indemnification terms that determine who bears financial exposure when something goes wrong.

 

What Each Party Controls?

 

The administrative employer controls: payroll processing and tax withholding; benefits administration; HR compliance filings; workers compensation insurance; and employment records. The worksite employer controls: day-to-day work direction; performance management; hiring and dismissal decisions (though executed through the administrative employer in most PEO models); setting working hours within legal limits; and defining the work environment and tools.

The division matters legally because employment claims can be directed at either party depending on which party’s failure caused the harm. A discrimination claim arising from how the client managed the worker in the workplace can be filed against the client as the worksite employer, even though the worker’s contract is with the PEO. A wage theft claim arising from incorrect payroll processing can be filed against the PEO as the administrative employer.

 

When Co-Employment Arises Unintentionally?

 

Co-employment does not always arise from a deliberate PEO arrangement. It can arise inadvertently when a company engages contractors or staffing agency workers for extended periods and exercises day-to-day control over their work. Courts and labor authorities in multiple jurisdictions, including the United States Department of Labor and the UK Employment Tribunal, apply multi-factor tests to determine whether a co-employment relationship exists regardless of what the contracts say.

Factors that courts examine include: how long the worker has been engaged; whether the company controls how, when, and where the work is done; whether the worker works exclusively for the company; whether the company provides tools and equipment; whether the work is integral to the company’s core business; and whether the worker has the opportunity to work for other clients. A contractor who fails several of these tests may be reclassified as a co-employee, exposing the company to back taxes, benefits entitlements, and employment law claims.

 

The Misclassification Trap

 

Treating workers as independent contractors when they function as co-employees is one of the most litigated employment law issues globally. The IRS, the Department of Labor, state labor agencies, and equivalent authorities in the UK, Germany, and Switzerland all have active enforcement programs targeting misclassification. Back payroll taxes, social insurance contributions, benefits entitlements, and penalties for the misclassified period can collectively exceed the cost savings the company sought to achieve by using contractors in the first place.

 

 

Co-Employment Liability Formulas

 

These formulas help legal, HR, and finance teams quantify the financial exposure that co-employment creates and evaluate whether a co-employment structure is financially rational compared to direct employment.

 

Liability and Cost Formulas

 

• Formula 1: Misclassification Back-Tax Exposure

Misclassification back-tax exposure is the potential amount a company may owe for unpaid payroll taxes and penalties when a worker is incorrectly classified as an independent contractor. The amount depends on the worker’s payments, applicable tax rates, misclassification period, and penalties.

• Formula 2: Benefits Entitlement Exposure

Benefits entitlement exposure refers to the potential cost of benefits a misclassified worker should have received as an employee, such as health insurance, retirement contributions, and paid leave. It is calculated based on the daily value of benefits multiplied by the number of days of misclassification, plus any applicable interest.

• Formula 3: Co-Employment Risk Score (Indicative)

The Co-Employment Risk Score is an indicative tool that assesses worker classification risk based on four factors: duration, company control, exclusivity, and integration into the business. Each factor is scored from 1 to 5, with higher scores indicating greater risk. A total score of 4–8 suggests low risk, 9–14 medium risk, and 15–20 high risk, helping identify situations that may require legal review or changes to the working arrangement.

• Formula 4: True Cost of Co-Employment vs. Direct Employment

The true cost of co-employment includes the contractor’s pay, agency or PEO fees, and an estimated liability reserve for potential legal or tax exposure. Direct employment cost includes salary, employer taxes, benefits, and HR costs. Including the liability reserve provides a more complete comparison because it accounts for potential risks that are often overlooked.

 

Why Co-Employment Matters for Employers?

 

Co-employment is not an abstract legal concept. It creates real financial and operational consequences that affect every team from HR to finance to legal.

 

Joint Employer Liability

 

The defining feature of co-employment is that both employers can be held liable for violations of employment law. A worker who is jointly employed by a staffing agency and a client company can sue both for wage theft, discrimination, harassment, wrongful termination, or benefits denial. The client company cannot simply point to the agency’s contract and claim no responsibility. Courts regularly impose liability on worksite employers for conditions they created or allowed in their workplace, regardless of which party processed the paycheck.

In the United States, the National Labor Relations Board has applied joint employer standards that make client companies liable for unfair labor practices committed in connection with staffing agency workers on the client’s premises. The standard has shifted multiple times between administrations, creating significant uncertainty for companies using large staffing workforces.

 

Employee Benefits and Discrimination Exposure

 

Co-employed workers who are excluded from the client company’s benefit plans may have legal claims if they are deemed employees under the relevant benefit plan rules. The Employee Retirement Income Security Act (ERISA) in the United States has generated significant litigation over whether workers placed through staffing agencies must be included in the client company’s retirement or health plans. Companies that exclude long-term placed workers from benefits face both the retroactive plan contribution liability and the attorneys’ fees associated with ERISA litigation.

 

Termination and Unfair Dismissal Risk

 

When a co-employment relationship ends, both the administrative and worksite employers may face claims depending on how the termination was handled. If the client company ends the engagement without following the proper process specified in the client services agreement, and the worker subsequently brings an unfair dismissal claim, the worksite employer’s failure to follow the contractual process can expose it to direct liability even though the worker’s formal employment was with the agency. Documenting the grounds for ending an engagement and giving the administrative employer the required notice period is not optional.

 

Co-Employment in Switzerland and Across Countries

 

Co-employment has very different legal status and practical implications across jurisdictions. Understanding where co-employment is a recognized legal framework and where it is not is essential for multinational employers.

 

Switzerland

 

Switzerland does not have a formal co-employment doctrine equivalent to that developed in the United States. Swiss employment law, governed by the Code of Obligations and the Recruitment of Temporary Workers Act (Arbeitsvermittlungsgesetz, AVG), recognizes a single employer for each worker. Temporary staffing (Personalverleih) is a regulated activity: agencies must hold a federal license from the State Secretariat for Economic Affairs (SECO) to place workers with client companies. The agency is the legal employer and is responsible for payroll, social insurance, and all statutory obligations. The client company is treated as a user of labor, not as a co-employer in the legal sense.

However, Swiss law does impose obligations on the user company (Betrieb) in staffing arrangements. Under the AVG, the user must ensure that placed workers are not paid less than comparable permanent employees doing the same work. The principle of equal treatment means that after a defined placement period, the agency worker’s compensation must align with the applicable collective labor agreement or the wages paid to permanent staff. If the user company fails to provide safe working conditions or violates labor law in its workplace, it can face liability for those violations regardless of the formal employment structure.

For PEO-style arrangements, Swiss law does not recognize co-employment in the same way the United States does. A foreign company using a Swiss managed payroll provider is still the sole legal employer of its Swiss employees; the provider processes payroll as an administrative agent. This is a critical distinction for liability allocation and is why the Employer of Record model is more legally robust in Switzerland for companies that want to separate operational direction from employer liability.

 

Co-Employment vs. Employer of Record

 

Co-employment and the Employer of Record (EOR) model are frequently confused because both involve a third-party organization in the employment relationship. The differences are fundamental and have major implications for liability.

The practical implication: a company that wants to reduce employment liability in a foreign market should use an EOR, not a PEO or co-employment arrangement. Co-employment transfers administrative burden but not legal risk. An EOR transfers both. For Swiss market entry specifically, the EOR model is the legally cleaner structure because Swiss law does not have a co-employment doctrine and the client company retains all employer liability under a PEO-style arrangement.

 

Best Practices for Managing Co-Employment Risk

 

Audit Every Extended Contractor Relationship

 

Apply the co-employment risk score formula to every contractor or staffing agency worker who has been on-site for more than six months. Contractors who score high on the risk matrix, particularly those who work exclusively for the company, in the company’s core business function, using company tools, and under daily management by the company’s employees, are functionally co-employees regardless of what the contract says. Audit findings should drive a decision to either reclassify the worker as a direct employee or genuinely restructure the relationship to reduce control.

 

Draft the Client Services Agreement With Liability Allocation in Mind

 

The client services agreement between the worksite employer and the PEO or staffing agency is the primary document that determines who pays when something goes wrong. It should explicitly allocate responsibility for each category of employment claim: who is responsible for wage and hour compliance, who manages discrimination complaints, who handles termination processes, and who holds workers compensation coverage. Without clear allocation, both parties can be named in litigation and both incur defense costs even when only one party was at fault.

 

 Set Maximum Engagement Duration and Enforce It

 

In Germany, the AÜG limits agency worker placements to 18 months with one user company. In the UK, agency workers gain equal treatment rights after 12 weeks. In Switzerland, extended placements attract scrutiny on equal pay grounds. In the United States, no federal duration limit exists, but long-term placements dramatically increase co-employment risk scores. Define a maximum engagement duration for all staffing arrangements, typically 12 to 18 months, and enforce it. Rotate workers, reclassify as direct employees, or restructure the engagement before the limit is reached.

 

Give Co-Employed Workers Equal Pay Where Required

 

Germany requires equal pay from day one (AÜG), with the option to deviate for up to nine months if a collective agreement covers the agency worker. Switzerland’s AVG requires equal pay alignment after the applicable collective agreement period. The UK’s Agency Workers Regulations 2010 require equal pay and working conditions after 12 weeks on-site. Non-compliance with equal pay obligations generates retroactive claims that can cover the entire engagement period with interest. Confirm the equal pay rule for every jurisdiction in which agency workers are placed before the first placement begins.

 

Train Managers on the Limits of Their Authority Over Co-Employed Workers

 

The most common source of co-employment liability is managers who treat staffing agency workers identically to direct employees without understanding the legal boundaries. Training should cover: what managers can direct (work tasks, schedule, output standards) and what they cannot do without involving the administrative employer (performance improvement plans, verbal warnings, pay changes, termination instructions). A manager who unilaterally fires an agency worker creates termination liability for the client company regardless of which entity employed the worker.

 

How Applic8 Handles Co-Employment?

 

Applic8 does not provide a co-employment or PEO service in Switzerland, because Swiss law does not recognize co-employment as a distinct legal structure. What Applic8 offers instead are two models that avoid the liability ambiguity of co-employment entirely.

For companies that already have a Swiss legal entity and want to outsource payroll and HR administration, As1 operates as an administrative service provider: the client remains the sole legal employer, and As1 processes payroll, calculates AHV/IV/EO, ALV, BVG, Quellensteuer, and FAK contributions, generates compliant payslips, and produces the required annual filings. The legal employer relationship is unambiguous: the client owns it entirely.

For companies that want to hire in Switzerland without establishing a local entity, Applic8 provides an Employer of Record service. Applic8 becomes the sole legal employer of the worker in Switzerland, signing a locally compliant employment contract, registering with the cantonal compensation office and BVG pension fund, managing all Swiss payroll tax and social insurance obligations, and providing full payslip and annual declaration compliance. The client directs the worker’s activities under a commercial services agreement. The liability picture is clear: Applic8 holds the employment obligations; the client holds the commercial relationship.

Both models are designed to give clients operational control of their workforce while maintaining a legally clear employer structure, which is the correct approach in a jurisdiction where co-employment has no formal legal basis.

 

 

Frequently Asked Questions About Co-Employment

 

What is co-employment?

 

 Co-employment is a legal arrangement where two organizations simultaneously hold employer status for the same worker. One entity, typically a staffing agency or Professional Employer Organization, handles payroll, benefits, and HR compliance. The other, the client or worksite company, controls the worker’s daily tasks and performance. Both can be held liable for employment law violations within their respective areas of responsibility. Co-employment is formally recognized and extensively litigated in the United States. In Switzerland and most of Europe, it is not a recognized legal structure: a single employer holds all employment obligations for each worker.

 

What is the difference between co-employment and an Employer of Record?

 

In co-employment, both the third-party organization and the client company hold employer status. The client retains direct legal exposure for employment claims arising in its workplace. In an Employer of Record arrangement, the EOR is the sole legal employer. The client company has no employer status and is largely insulated from direct employment liability. The worker’s contract is entirely with the EOR, not with the client. Co-employment requires the client to have a local entity. An EOR enables hiring in countries where the client has no entity at all. For companies entering Switzerland, the EOR model provides clearer liability separation because Swiss law does not recognize co-employment.

 

Does co-employment apply in Switzerland?

 

Co-employment as a formal legal doctrine does not exist in Switzerland. Swiss employment law recognizes a single employer for each worker. Temporary staffing arrangements are governed by the Recruitment of Temporary Workers Act (AVG), which requires staffing agencies to hold a federal license from SECO and designates the agency as the sole legal employer. Client companies are treated as user companies, not co-employers. They have specific obligations under the AVG, including equal pay alignment, but do not carry the full spectrum of joint employer liability seen in US co-employment arrangements. For companies seeking genuine liability separation in Switzerland, the Employer of Record model that Applic8 offers is the appropriate structure.

 

How can a company avoid unintentional co-employment?

 

Apply the co-employment risk score to every extended contractor or staffing relationship. Score duration, control, exclusivity, and integration on a 1-5 scale. Scores above 14 out of 20 indicate high misclassification risk. Take one of three actions: reclassify the worker as a direct employee; genuinely restructure the engagement to reduce control and exclusivity; or formalize the relationship through a licensed staffing agency with a clear client services agreement that allocates liability. Do not rely on a contractor label in the contract alone. Courts look past the label to the actual working relationship.

 

Can a co-employed worker sue the client company?

 

In the United States, yes. A worker who is jointly employed by a staffing agency and a client company can file employment claims, including discrimination, harassment, wage theft, and wrongful termination, against both the administrative employer and the worksite employer. The client company cannot use the agency contract as a shield against claims arising from conditions in its own workplace. In Switzerland, the user company is not legally a co-employer and faces more limited exposure, primarily for workplace safety violations and equal pay failures under the AVG. In Germany, UK, and France, the user company also faces limited but real liability for workplace conditions and equal treatment obligations, even when the worker’s formal contract is with the agency.