Additional Insured

An additional insured is a party added to another party's insurance policy as an insured, so that the policy responds to claims against them as well as against the policyholder. New York's Department of Financial Services describes it in those terms: additional insured "is an insurance industry term that refers to a person or entity that has been added to an insurance policy as an insured by the insurer at the behest of the insured that purchased the policy." The mechanism is an endorsement, which the National Association of Insurance Commissioners defines as "an amendment or rider to a policy adjusting the coverages and taking precedence over the general contract."

It is an industry term rather than a statutory one. The same New York opinion notes that "the term 'additional insured' is not defined by New York statute or regulation, although it is referenced therein", and the association's own glossary, which does define "named insured", "endorsement" and "declarations", carries no entry for it. What that means practically is that the content of the status comes from the endorsement's own wording rather than from any shared definition, so two contracts asking for the same three words can be asking for materially different coverage.

The single most useful thing to know is that the certificate does not do it. A certificate of insurance is a summary document evidencing that a policy is in force. New York's regulator has said repeatedly what that means and what it does not mean: a certificate "is not a contract, and is not required by statute or regulation"; it "is not intended to confer to a certificate holder new or additional rights beyond what the insurance policy provides"; and, decisively, "a certificate of insurance may not name an entity as an additional insured unless the insurance policy referenced by the certificate actually includes that entity as an additional insured." The department goes further and treats a document that amends, expands or otherwise alters the terms of the policy as a policy form which must be filed with the Superintendent under section 2307(b) of the Insurance Law, and it has warned producers that adding terms to certificates can lead to disciplinary measures. So a certificate listing a landlord as an additional insured, where no endorsement was ever issued, is not partial protection. It is nothing, and it looks exactly like something.

The coverage extended is whatever the endorsement grants, and it is not automatically the coverage the named insured has. Because the term carries no statutory definition, the endorsement's own wording decides the scope, and endorsements differ. The grant may be tied to liability arising out of the named insured's work or operations for that party, in which case a landlord added to a tenant's policy is covered for claims connected to the tenant's activities and not for claims arising from the landlord's own conduct elsewhere on the property. It may or may not reach the named insured's completed work after the job ends. It may or may not be primary to the additional insured's own insurance. State law can also cap the grant: California provides that an additional insured endorsement issued for the benefit of a public agency in connection with a construction contract covered by section 2782(b) of the Civil Code "shall not provide any duty of indemnity coverage for the active negligence of the additional insured", and that a contract requirement to procure insurance invalid under that section is itself invalid. None of this is visible on a certificate. All of it is in the endorsement, which the additional insured can ask for and rarely does.

Contracts also mix this up with a genuinely different status. An "additional named insured" is not the same as an additional insured: a named insured is a party to the policy with the fuller set of rights described on the named insured page, while an additional insured is an insured for defined purposes. A contract that asks for one and means the other is asking for either more or less than the drafter thinks, and the request is worth clarifying before it is priced.

Adding people is not costless, and the cost that matters is not the premium. A liability policy has a limit per occurrence and an aggregate limit for the policy year, and additional insureds share them. A defense mounted and a settlement paid on behalf of an additional insured draws down the same aggregate the named insured is relying on for their own year. That is the practical consequence of "extends your coverage to them", and it is the reason a business that adds every client to every policy has less protection at the end of a bad year than the certificate count suggests. The structure of those limits, and whether defense costs sit inside or outside them, belongs to the business liability insurance page.

There can also be a regulatory ceiling on how many unrelated parties a single policy can carry. New York provides an example. Under 11 NYCRR section 153.1(g), a property or casualty policy insuring the interests of two or more persons or entities may constitute a group policy, with named exceptions for entities under common control, franchisors and franchisees, partners and joint venturers, certain family members, and parties with "shared interests". The regulation defines shared interests for liability insurance as "ownership or control of an additional insured's operations and activities such that, if damages arise from such operations or activities, the first named insured and all insureds may be jointly liable." The department's conclusion is that an entity may be added as an additional insured on another's policy "but only to the extent that it has a shared interest with the first-named insured and all other additional insureds on the policy." That is New York's rule rather than a national one, but it makes the general point: the ability to bolt an unrelated party onto a policy is not unlimited, and where it is limited the limit sits in state regulation rather than in the contract that requested it.

A contract, lease or vendor agreement requires the named insured to add the other party as an additional insured. The named insured asks their agent or broker, the insurer issues an endorsement amending the policy, and a certificate is then produced as evidence that the endorsement exists. The additional insured can ask for a copy of the endorsement itself, which is the document that actually states what they have. If a claim is brought against the additional insured within the endorsement's scope, the insurer defends and pays under the same policy, drawing on the same limits.

A hypothetical, to show the cost that is not the premium. Idris runs a small contracting business with a general liability policy carrying a $1,000,000 per-occurrence limit and a $2,000,000 general aggregate for the policy year. Two of his clients are added as additional insureds for work he performs for them.

Early in the year, a claim against the first client, arising out of Idris's work, settles for $600,000 under his policy. The general aggregate available for the rest of the year is $2,000,000 − $600,000 = $1,400,000.

Later, a claim against the second client settles for $500,000. That leaves $1,400,000 − $500,000 = $900,000 for anything else that happens before the policy year ends, including a claim brought directly against Idris.

Both payments were correct, both clients got exactly what the contracts asked for, and Idris now has less than half his aggregate left with months to run. Figures are invented; the mechanism is that additional insureds share one set of limits rather than receiving their own.

Pros, from the additional insured's side

• It is real coverage rather than evidence of somebody else's coverage: the insurer defends and pays claims against them within the endorsement's scope.
• It reaches the party with the closest connection to the work, which is generally the party best placed to have insured it.
• The endorsement is a document that can be requested and read, so the scope is knowable in advance rather than at the claim.

Pros, from the named insured's side

• It satisfies the contract, lease or vendor requirement that is usually the condition of getting the work.
• It is normally added by endorsement at modest or no additional premium relative to the value of the contract it unlocks.

Cons

• It consumes the named insured's own limits. A defense and settlement for an additional insured comes out of the same aggregate.
• The scope varies by endorsement and is invisible on the certificate that gets circulated, so both sides can be wrong about what was granted.
• A certificate naming an additional insured where no endorsement exists confers nothing at all, and it is the commonest way this goes wrong.
• Contracts routinely confuse additional insured, additional named insured and certificate holder, which are three different things.
• The number and kind of unrelated parties that can be added is constrained in some states, so a contract may require something the insurer cannot lawfully issue there.
• Coverage may end when the work does. Whether the endorsement reaches completed work is a term of the endorsement rather than an assumption.