Professional Liability (PL) and Employers Liability (EL) describe two fundamentally different types of business insurance coverage. Though both policies address liability risks and protect a company’s financial stability, they are not interchangeable. These policies are designed to cover separate sets of claimants and distinct categories of legal claims arising from a company’s operations. Business owners must understand the separation between these two coverages to manage risk exposure and ensure comprehensive protection.
Defining Professional Liability Insurance
Professional Liability (PL) insurance, frequently known as Errors & Omissions (E&O) coverage, protects businesses that provide a professional service or advice for a fee. This policy is triggered by claims made by clients alleging financial loss due to a mistake, oversight, or negligent service. PL specifically addresses the risk inherent in intellectual or advisory work, where an error can cause monetary damage to the client.
Examples include a client losing revenue because an IT consultant misconfigured a server or a tax penalty resulting from an accountant’s error. Legal defense costs, settlements, and judgments arising from these client claims are covered, even if the claim is without merit. General liability policies do not respond to claims of financial harm stemming from professional advice, making PL a necessary safeguard for fields like accounting, architecture, and consulting.
Defining Employers Liability Insurance
Employers Liability (EL) insurance protects an employer against claims filed by an employee related to a job-related injury or illness. The policy covers the employer’s legal costs and potential damages when an employee alleges the injury was caused by the employer’s negligence. This coverage is distinct from the automatic, no-fault medical and wage benefits provided under a standard Workers’ Compensation policy.
EL handles situations where an employee legally bypasses the Workers’ Compensation system to sue the employer directly for damages. This includes claims alleging the employer failed to maintain a safe working environment or was grossly negligent. For example, if a worker is injured due to faulty machinery and sues for pain and suffering beyond statutory Workers’ Compensation limits, the EL policy would activate.
Key Differences in Scope and Claimant
The most significant distinction between Professional Liability and Employers Liability lies in the identity of the claimant. PL protects against claims brought by external clients or third parties who received the company’s professional services. Conversely, EL exclusively addresses claims filed by the company’s own employees or their family members.
The type of harm covered is also fundamentally different. PL responds to claims of financial harm, such as monetary loss or breach of contract, resulting from a breach of professional duty. EL is activated solely by claims involving bodily injury, illness, or death that an employee sustains while working, responding to a breach of the employer’s duty of care.
The Relationship Between Employers Liability and Workers’ Compensation
Employers Liability insurance is functionally linked to the statutory Workers’ Compensation (WC) system in the United States, typically included as “Part Two” of a standard WC policy. WC provides no-fault benefits to injured employees, offering medical care and lost wages regardless of fault. In exchange for these benefits, the system generally grants the employer immunity from direct employee lawsuits, known as the exclusive remedy doctrine.
EL exists to cover gaps where this doctrine may not apply, allowing the employee to sue the employer directly. Claims that trigger EL include:
Third-Party Over Actions
An injured employee sues a manufacturer, who then sues the employer for negligence in contributing to the injury.
Loss of Consortium
Claims filed by an employee’s spouse.
Dual-Capacity Lawsuits
Situations where the employer has a separate legal relationship with the injured employee.
In these situations, EL covers the employer’s legal defense costs and any resulting judgments or settlements that exceed the standard WC benefits.
Determining When Both Policies Are Required
Many businesses require both Professional Liability and Employers Liability policies to be fully protected against unique risks. Any firm providing advice, design, or specialized knowledge to external clients, such as an architectural firm or a software development agency, needs PL to cover potential client claims.
If that firm hires even a single employee—including part-time staff or temporary workers—it will almost certainly be required to carry Workers’ Compensation, which includes EL. For example, an engineering consultancy faces the risk of a client suing over a design flaw (PL) and the risk of an employee suing over a workplace injury (EL). Businesses that have employees and offer a professional service must secure both forms of coverage to manage diverse liability exposures.

