You cannot add an additional insured to a workers’ compensation policy the way you would on a general liability or commercial auto policy. The coverage is tied to a specific employer-employee relationship, and carriers will reject the request outright. When a contract or lease demands protection for a third party on your workers’ comp, two endorsements do the job instead: the Alternate Employer Endorsement and the Waiver of Subrogation. In many cases, a Certificate of Insurance is all the requesting party actually needs.
Why Workers’ Comp Doesn’t Work That Way
A workers’ compensation policy is a contract between an insurer and one named employer, covering that employer’s statutory obligation to pay benefits to its own employees for job-related injuries. State labor laws define that obligation around the direct employment relationship: the employer hires the worker, controls the work, and pays the wages. Extending coverage to a company with no employment relationship to those workers creates a mismatch between who the policy covers and who the law requires it to cover.
Underwriting rules reinforce the structure. The NCCI Basic Manual generally limits a single workers’ comp policy to legal entities sharing majority ownership. A project owner, general contractor, or landlord with no ownership stake in your business falls outside those rules. Beyond the technical barrier, adding an unrelated party could create confusion over who owes benefits after a claim, which risks delaying an injured worker’s medical care and wage replacement.
What the Other Party Usually Actually Needs
When a client, general contractor, or property owner asks to be “added to your workers’ comp,” they often don’t need any coverage grant at all. Many contracts simply require proof that you carry the coverage. A Certificate of Insurance, issued by your broker or carrier, names the requesting party as the certificate holder and confirms your policy exists, its effective dates, and the limits. The certificate holder gets no coverage rights under your policy, but gets the documentation the contract calls for.
Read the contract language before asking your carrier for anything more. If it says “provide evidence of workers’ compensation coverage” or “furnish a certificate of insurance,” a certificate is enough. If it specifically names an alternate employer endorsement or a waiver of subrogation, that tells you exactly which mechanism to request.
The Alternate Employer Endorsement
The Alternate Employer Endorsement, NCCI form WC 00 03 01 A, is the closest workers’ comp equivalent to naming an additional insured. It extends your policy so that when your employees work under another company’s direction, that company receives the same protections your policy gives you as the named employer.1NCCI. WC 00 03 01 A – Alternate Employer Endorsement
This arrangement is most common in staffing and temporary labor. When a staffing agency sends workers to a client’s job site, those workers often take day-to-day direction from the client. Under the borrowed servant doctrine, the company controlling the details of the work can become responsible for workplace injuries even though it didn’t hire the worker. The endorsement makes the staffing agency’s policy respond as if the client were also an insured employer.
The practical benefit is access to the exclusive remedy rule. Workers’ comp operates on a trade: employees receive guaranteed medical and wage benefits regardless of fault, and in return they generally cannot sue their employer for the injury. With the endorsement in place, the alternate employer gains that same lawsuit protection, so an injured worker’s claim moves through the comp system rather than becoming a personal injury suit against the client.1NCCI. WC 00 03 01 A – Alternate Employer Endorsement
Limits Both Sides Should Understand
The endorsement has several built-in restrictions.
- It does not satisfy the alternate employer’s own duty to carry workers’ compensation. The form says so explicitly: it is “not intended to satisfy the alternate employer’s duty to secure its obligations under the workers compensation law.” The alternate employer still needs its own policy for its direct employees.2NCCI. WC 00 03 01 A – Alternate Employer Endorsement
- Coverage is limited to the state scheduled in Item 2 of the endorsement. If your employees work for the same client in multiple states, each state must be scheduled.1NCCI. WC 00 03 01 A – Alternate Employer Endorsement
- Coverage can be narrowed to a specific contract or project. If Item 3 names a particular agreement, the endorsement only covers work performed under it.1NCCI. WC 00 03 01 A – Alternate Employer Endorsement
- The alternate employer must be named in the schedule. An entity not listed has no protection. In one federal case, a carrier successfully argued the endorsement did not apply to an employer not identified in the schedule, leaving that employer exposed to direct litigation.3U.S. Department of Labor. Schaubert v. Elf Aquitaine – BRB No. 98-153
- The insurer will not file evidence of coverage with any government agency on the alternate employer’s behalf, and will not pursue the alternate employer’s own insurer to share a covered loss.2NCCI. WC 00 03 01 A – Alternate Employer Endorsement
When the Request Is Really a Waiver of Subrogation
When a contract calls for a “waiver of subrogation” on workers’ comp, it’s asking for a different endorsement entirely: NCCI form WC 00 03 13, “Waiver of Our Right to Recover From Others.” Normally, after paying a comp claim, your insurer can sue any responsible third party to recover what it paid. The waiver gives up that right against a specific person or organization named in the schedule.4NCCI. WC 00 03 13 – Waiver of Our Right to Recover From Others Endorsement
The endorsement only applies when you perform work under a written contract that requires it.4NCCI. WC 00 03 13 – Waiver of Our Right to Recover From Others Endorsement General contractors and property owners frequently require it because without the waiver, even if the owner’s negligent maintenance contributed to an injury, your carrier could pursue them for reimbursement. The waiver takes that risk off the table.
A waiver of subrogation does not give the named party coverage under your policy and does not grant them access to the exclusive remedy defense. It only blocks your insurer from going after them. Some contracts require both the waiver and the alternate employer endorsement, so read the insurance requirements section closely.
How to Request Either Endorsement
Contact your broker or your carrier’s underwriting department with a formal request and send over the contract that triggered the requirement. The underwriter will review the language, confirm which endorsement fits, and weigh the risk based on the alternate employer’s industry, the nature of the work, and how much control that company will have over your employees.
For the Alternate Employer Endorsement, the standard form requires three schedule items:2NCCI. WC 00 03 01 A – Alternate Employer Endorsement
- Item 1, the alternate employer’s full legal name and physical address, matching the entity in the underlying contract exactly.
- Item 2, the state of special or temporary employment where your employees will perform the work.
- Item 3, the specific contract or project. If left blank, the endorsement covers all work your employees perform for the alternate employer in the scheduled state. If named, coverage is limited to that scope.
Underwriters often ask for more than the form requires: the alternate employer’s federal tax identification number, anticipated payroll for workers assigned to the project, applicable classification codes, and the expected duration of the work. Having the written contract on hand speeds the process, especially when it specifies coverage limits you need to match.
The alternate employer endorsement itself usually adds little or no separate premium, because your workers’ comp premium is already driven by the payroll and classification codes of the workers assigned to each client. Waiver of subrogation endorsements may carry a small percentage surcharge, varying by carrier and state.
Once the carrier approves and issues the endorsement, it becomes part of your policy. Then request an updated Certificate of Insurance for the requesting party. The certificate should reference the endorsement form number in the description of operations, and the names and addresses on the certificate must match the legal entities in the underlying agreement.
Monopolistic State Fund Jurisdictions
A few states run monopolistic workers’ compensation funds, meaning employers must buy coverage through the state rather than a private carrier. Policies from these state funds typically do not include employers’ liability coverage, and they may not accommodate the alternate employer or waiver of subrogation endorsements the way private carriers do. If you have employees working in one of these states, ask your broker whether the state fund will issue the endorsement at all, or whether the contractual requirement has to be met through a different mechanism such as stop-gap coverage on your general liability policy.