Waiver of Subrogation vs Additional Insured: The Difference

Last updated August 2026.

A waiver of subrogation stops your vendor's insurance company from suing you to recover money it paid on a claim. Additional insured status gives you coverage and a legal defense under your vendor's policy when someone sues you. They point in opposite directions, they are created by different endorsements, and holding one does nothing to give you the other. Most well-drafted contracts require both.

These two requirements sit next to each other in almost every insurance clause in American commercial contracting, and they get mixed up constantly, including by the people preparing the certificates. Part of the reason is that both are recorded in a single row of checkboxes on an ACORD 25, right beside each other, in columns labeled ADDL INSD and SUBR WVD. Two ticks in two boxes look interchangeable. The coverage behind them is not.

Waiver of subrogation vs additional insured at a glance

What does a waiver of subrogation actually do?

Subrogation is the right an insurance company has, after paying its own policyholder, to step into that policyholder's shoes and sue whoever caused the loss. It is ordinary and it happens quietly at scale. A contractor's worker gets hurt on your site, the contractor's workers compensation carrier pays the medical bills and lost wages, and eighteen months later that carrier's recovery unit files suit against you as the property owner, arguing your condition of the premises caused the injury.

A waiver of subrogation shuts that door before it opens. The vendor's carrier agrees in advance that it will not enforce its recovery rights against the party named or described in the endorsement. The current general liability wording, from the December 2019 edition of CG 24 04, reads:

We waive any right of recovery against the person(s) or organization(s) shown in the Schedule above because of payments we make under this Coverage Part. Such waiver by us applies only to the extent that the insured has waived its right of recovery against such person(s) or organization(s) prior to loss.

Note the second sentence, because it is where most waivers quietly fail. The insurer waives only as far as its own insured already waived, in writing, before the loss. If your subcontract has no mutual waiver of claims clause, or was signed two weeks after mobilization, the endorsement can be sitting in the policy and still leave you exposed. The waiver of subrogation endorsement forms page walks through each coverage line and quotes the wording from real issued policies.

What does additional insured status actually do?

Additional insured status makes you an insured under someone else's policy for the exposure the endorsement describes. When a claimant sues you over something your vendor did, you tender the claim to the vendor's carrier and that carrier defends you and pays covered damages up to the policy limit.

The defense obligation is the part worth having. A construction defect suit that ends in a defense verdict still costs six figures in legal fees, and additional insured status is what shifts that bill. A waiver of subrogation would not have helped in that scenario at all, because nobody was subrogating against you.

The endorsement that creates the status matters as much as having it. CG 20 10 covers you while the work is ongoing. From the October 2001 edition forward it stops at completion, which means the defect claim that surfaces two years after the job is not covered unless CG 20 37 or one of the automatic completed operations forms was also attached. The full form-by-form breakdown is in the guide to additional insured endorsement forms.

Does an additional insured need a waiver of subrogation?

Yes, and the reason is not obvious. You might assume that if you are already an insured under the vendor's policy, that carrier cannot sue you, since insurers generally cannot subrogate against their own insureds. That protection is real but narrow. It applies only to the scope of coverage the endorsement granted you, and additional insured grants are limited by their terms: a particular location, particular operations, ongoing work only, and since the April 2013 editions, capped at whatever your own contract required.

Anything outside that boundary is fair game for a recovery claim. And it does nothing for the other policies. Your CG 20 10 on the liability policy has no effect on the workers compensation carrier, which is the carrier most likely to come after you, because employee injury claims are the ones that get pushed upstream. Requiring both, across all the lines your contract names, closes the gap that either one alone leaves open.

Where primary and non-contributory fits in

There is a third requirement in the same sentence of most insurance clauses, and it is a different thing again. Primary and non-contributory wording, usually CG 20 01 on a liability policy, decides the order in which policies pay. Without it, the vendor's carrier can argue that your own general liability policy should contribute to the loss on a pro rata basis, which drags your policy and your loss history into a claim your vendor caused.

So the three requirements answer three separate questions. Additional insured status asks whether the vendor's policy covers you at all. Primary and non-contributory asks whether it pays before yours. Waiver of subrogation asks whether the vendor's insurer can come back at you afterward. The primary and non-contributory endorsement is worked through separately.

Is a waiver of subrogation the same as a hold harmless agreement?

No. A hold harmless or indemnity clause is a promise between you and the vendor, enforceable against the vendor's balance sheet. A waiver of subrogation binds the vendor's insurance company, which is a different party with much deeper pockets. A vendor that indemnifies you and then goes out of business has given you a claim against an empty shell. The insurer that waived subrogation is still bound.

The two work together. Many state anti-indemnity statutes limit how far a contractual indemnity can reach, particularly in construction, so risk transfer that leans entirely on the indemnity clause is fragile. The insurance requirements are what make it stick.

How to require both in a contract

Name the coverage lines, not just the concepts. An insurance clause that says the contractor shall name the owner as additional insured and provide a waiver of subrogation is ambiguous about which policies it reaches. Vendors resolve ambiguity in the cheapest direction, which usually means one endorsement on the general liability policy and nothing else.

Write it out line by line: additional insured for ongoing and completed operations on general liability, primary and non-contributory, waiver of subrogation on general liability, business auto and workers compensation, and confirm whether the umbrella follows form for these conditions or needs its own endorsement. Add a mutual waiver of claims between the parties, because that clause is what makes the December 2019 CG 24 04 wording function. Then get the agreement executed before anyone starts work, which is the single most common failure point and the cheapest one to fix.

None of this holds unless somebody checks it, and insurance requirements are only one of the obligations a signed vendor agreement puts on you to monitor, alongside licensing, data protection terms and renewal dates that all need a system for tracking contractual obligations rather than a shared drive and a good memory.

How to verify both on a certificate

You cannot, and that is the honest answer. The ACORD 25 states on its face that it is issued as a matter of information only, confers no rights on the certificate holder, and does not amend, extend or alter the coverage afforded by the policies. The ADDL INSD and SUBR WVD columns are typed by whoever prepared the document. They report that endorsements exist. They are not the endorsements, they do not name the form numbers, and they do not carry the edition dates.

The workable process is short. Accept the certificate as your record of limits, carriers and expiration dates. Request the endorsement pages for anything the contract required as risk transfer, and read the form number and edition date printed in the top right corner. Check that the schedule either names your legal entity or carries blanket wording, and that any contract it depends on was executed before the work started. Then store the form numbers as data rather than as filed PDFs, so a question like which of my vendors lack a workers compensation waiver is answerable without opening anything.

That last point is why teams outgrow spreadsheets on this. Tracking whether a certificate arrived is easy. Tracking which of six endorsements each of four hundred vendors carries, on which coverage line, on which edition, and whether any of it quietly changed at renewal is not, and it is the part that decides whether the risk transfer you negotiated actually works. COI verification software reads the form numbers off the endorsements themselves and checks them against what each contract required.

For where these two requirements physically appear on a certificate, see waiver of subrogation on a certificate of insurance, and for the equally common confusion between being covered and simply being sent the paperwork, additional insured vs certificate holder.