Guides / COI basics

Additional Insured vs. Certificate Holder: What's the Difference?

By SubCover HQ · Updated Oct 27, 2026 · 5 min read

It's one of the most common misunderstandings in construction and property management: "We're on their certificate, so we're covered." Maybe, maybe not. Being the certificate holder and being an additional insured are two very different things, and the difference shows up when a claim comes in.

The short version

• Certificate holder: the party the COI was issued to. It's essentially the mailing address. It gives you proof that policies existed when the certificate was issued and no rights under those policies.
• Additional insured (AI): a party added to someone else's liability policy by endorsement, so the policy can defend and pay claims against them arising from the named insured's work, within the endorsement's terms.

You can be a certificate holder without being an additional insured. Plenty of companies are, without realizing it.

What being the certificate holder gets you

The certificate holder box on the ACORD 25 tells the agent who should receive the certificate. Being listed there:

• Gives you evidence of the sub's coverage as of the issue date.
• Gives you a record for your files and your own insurer's audit.
• Does not give you any right to make a claim under the sub's policy.
• Usually does not guarantee you'll be notified if the policy is canceled.

What being an additional insured gets you

If a sub's employee is hurt on your job, or a vendor damages a tenant's property, the injured party often sues everyone involved, including you. If you're an additional insured on the sub's general liability policy, that policy may defend you and pay on your behalf for claims arising out of the sub's work, so the loss doesn't land on your own policy and your loss history.

That's why most subcontracts and vendor agreements require AI status. It shifts the risk to the party doing the work, which is usually where it belongs.

AI status comes from an endorsement, not the certificate

The ACORD 25 says right on its face that it doesn't amend the policy, and that if the holder is an additional insured, the policy must have an endorsement. So the "Y" in the ADDL INSD column, or a note in the description box, is a signal only. The endorsement is what counts.

Common ISO additional insured endorsements you'll see referenced:

• CG 20 10: additional insured for ongoing operations, while the work is being performed.
• CG 20 37: additional insured for completed operations, after the work is finished. Important in construction, since many claims surface after a job is done.
• CG 20 26: designated person or organization, often used by property managers and landlords.
• CG 20 38: extends AI status to parties up the chain (for example, owner and GC) when required by contract.
• Blanket AI endorsements: automatically add anyone the insured has agreed in a written contract to add. Very common, but they only work if your written contract actually requires it before the work starts.

Many insurers use their own versions with different form numbers. The edition date matters too, since wording has changed over the years. Your broker can tell you which forms and editions satisfy your requirements.

Related terms you'll see together

• Primary and noncontributory: the sub's policy responds first, and won't seek contribution from your policy. Often required alongside AI status, and also done by endorsement.
• Waiver of subrogation: the sub's insurer gives up its right to recover from you after paying a claim. See our waiver of subrogation guide.
• Per-project aggregate: makes sure the sub's aggregate limit isn't eaten up by claims on other jobs.

Who should be additional insured?

That's a contract question for you and your attorney, but common patterns include:

• General contractors: the GC, the project owner, and sometimes the lender or architect, as the prime contract requires.
• Property managers: the property owner (often the specific ownership LLC) and the management company. Getting the exact legal entity names right matters.

Your own contract with the owner often dictates who has to appear on your subs' policies. Pass those requirements down in writing.

What to ask subs and vendors for

1. A current ACORD 25 naming you as certificate holder, with correct legal name and address.
2. The ADDL INSD box marked on general liability (and auto/umbrella if your contract requires).
3. A copy of the additional insured endorsement(s), ongoing and completed operations if you're in construction.
4. Primary and noncontributory and waiver of subrogation endorsements if required.
5. A description of operations referencing your project or property, if you require it.

Common mistakes

• Accepting a certificate with "additional insured" typed into the description box and no endorsement.
• Listing the management company but not the ownership entity, or vice versa.
• Ongoing operations coverage only, when completed operations claims are the bigger exposure.
• Relying on a blanket endorsement when the written contract was never signed, or was signed after work started.

Let someone else chase the endorsements

Getting endorsements is the slowest part of COI compliance, because it usually takes a second or third email to the agent. SubCover HQ requests them, checks them against your requirements, and flags what's missing.

Frequently asked questions

Can I just ask the agent to list me as additional insured on the certificate?

The agent can show it on the certificate only if the policy actually has an endorsement that covers you. If the sub's policy has a blanket additional insured endorsement triggered by written contract, your signed subcontract may be enough. If not, the sub has to ask its insurer to add you, which sometimes carries a small premium. Either way, ask for a copy of the endorsement.

Does additional insured status cover everything?

No. It's usually limited to claims arising out of the named insured's work or operations, and only up to the policy limits, which are shared with the sub and any other additional insureds. Some endorsements also exclude completed operations, or only cover you for the sub's negligence. That's why the form number and wording matter.

Do I need to be additional insured on workers' comp?

Workers' compensation doesn't use additional insureds the way liability policies do. For workers' comp, the usual protections are proof the sub carries the coverage and a waiver of subrogation in your favor.

How often should I re-check?

At every policy renewal, and any time a sub starts work on a new project with different contract requirements. Many companies also re-request certificates annually even when nothing has changed, because policies, insurers, and agents change.

General information only, not insurance or legal advice. Ask your broker and attorney what your contracts should require.