A primary and noncontributory (PNC) endorsement changes the order in which liability policies respond to a claim. Your policy pays first, and your insurer does not ask the other party's policy to share the cost. Contracts ask for it all the time, and it has to be on your policy itself, not just typed onto a certificate of insurance.
This guide explains the wording in plain terms, how it fits with additional insured status and a waiver of subrogation, and how to confirm you actually have it. It is written for contractors, developers, and small business owners who just got a contract that says "primary and noncontributory."
TL;DR
- "Primary" means your liability policy responds first. "Noncontributory" means your insurer won't ask the other party's insurance to chip in.
- On general liability policies, it is commonly added with an ISO form such as CG 20 01. It is usually tied to a written contract that requires it.
- It is not the same as additional insured status or a waiver of subrogation. The three work together but do different jobs.
- A certificate of insurance is only evidence of coverage. Check the issued policy and its endorsement list.
- Ask your agent for the endorsement by form number before you sign the contract, not after a claim.
Table of Contents
- What primary and noncontributory means
- Why contracts ask for it
- How the endorsement works on the policy
- PNC vs. additional insured vs. waiver of subrogation
- Courts look at the wording
- Certificate vs. policy: how to confirm you have it
- Perspective: why we ask for the form number up front
- Common mistakes to avoid
- Get your contract insurance-ready
- FAQ
- Sources
What primary and noncontributory means
Two ideas sit inside the phrase.
Primary. When more than one policy could cover the same loss, one has to answer first. A primary policy pays up to its limits before any other policy is asked to pay.
Noncontributory. Normally, an insurer that pays a claim may try to recover a share from another policy that also covers it. Noncontributory wording says your insurer will not do that against the other party's policy.
Put together, the endorsement tells the claim process that your policy goes first, and the other party's own liability insurance stays in the background. In the example language many carriers use, the coverage is described as primary to and not seeking contribution from any other insurance available to the additional insured under that party's own policy.
A simple scenario: a property owner hires you as a roofing contractor. A worker's injury leads to a claim that names both of you. The owner's contract requires PNC wording. If your policy has it, your general liability insurer handles the defense and payment first. The owner's own policy is not asked to share, which protects their loss history and premiums.
Why contracts ask for it
Upstream parties, such as owners, general contractors, and landlords, want to be sure the party doing the work carries the first dollar of risk. Contracts may require the counterparty's insurance to be primary and noncontributory so the additional insured's own insurance is not called upon first or required to contribute.
You will usually see it in:
- Subcontracts and master service agreements
- Commercial leases
- Vendor and event agreements
- Construction contracts for new builds and renovations
If you work on projects, our guide to subcontractor insurance requirements shows how to ask for each endorsement page a contract calls for.
How the endorsement works on the policy
Most general liability policies include an Other Insurance condition. It sets out what happens when another policy also applies. Without an endorsement, that condition may make your coverage excess over other available insurance for certain additional insureds, or let your insurer seek contribution.
The ISO form most people mean is CG 20 01. The 12 19 edition revises the Other Insurance condition so that additional insured coverage is primary and noncontributory when a written agreement requires it and the additional insured is a named insured on other available insurance.
Three things follow from that wording:
- A written agreement matters. The endorsement is tied to a contract that requires primary and noncontributory coverage. No requirement in the contract, no PNC response.
- It applies to the additional insured. The wording protects the party who was added to your policy, so it works alongside an additional insured endorsement.
- Form editions differ. Carriers use different editions and sometimes their own manuscript wording. The exact words decide how a claim is handled.
The contract requirement is not a technicality. In one American Bar Association example, a subcontractor's policy ended up as excess because the contract did not require primary and noncontributory coverage, which is what the policy condition called for. Read the contract language and the policy wording side by side.
PNC vs. additional insured vs. waiver of subrogation
These three requests show up together in contracts and get confused constantly.
| What it does | Who it helps | Typical form | |
|---|---|---|---|
| Additional insured | Adds another party as an insured on your liability policy | The party you add | CG 20 10, CG 20 37, and others |
| Primary and noncontributory | Sets your policy to respond first, with no contribution sought from theirs | The additional insured and their insurer | CG 20 01 |
| Waiver of subrogation | Stops your insurer from pursuing the other party after paying a claim | The party named in the waiver | CG 24 04 |
In short, a primary and noncontributory clause determines which policy pays first and whether insurers share costs, while a waiver of subrogation limits an insurer's ability to recover from a responsible third party after paying.
Additional insured status gets someone onto your policy. PNC says how that policy responds once they are on it. Neither one gives you the waiver. Our explainers on additional insured status for contractors and waiver of subrogation forms cover those two in detail. If a contract also names a lender or mortgagee, see the difference between a loss payee and an additional insured.
Form revisions can change the details too. The revised CG 24 04 waiver of subrogation endorsement removes the reference to operations under a contract with the named party, which addresses whether a direct contract is required. Ask your agent which edition your carrier issues.
Courts look at the wording
PNC disputes usually come down to the words on the page. In a New York decision, the court held that one insurer waived contribution from another under its Primary Non-Contributory Endorsement. The practical lesson is that a clearly worded endorsement can settle who pays, and a vague one invites a fight between insurers that can delay your claim.
If you want to read how disputes over an insurer's waiver of contribution are analyzed, a commercial real estate perspective on rising insurance costs for property owners shows why owners push these requirements down to their contractors.
Certificate vs. policy: how to confirm you have it
This is where most people get caught. A certificate of insurance (COI) can include a note such as "primary and noncontributory." But a certificate is only evidence of coverage, and it does not change the policy. The Association of Corporate Counsel warns that treating certificates as definitive proof is a common pitfall.
Here is a checklist to use before you sign a contract or send a COI:
- Get the contract language. Note whether it asks for primary and noncontributory coverage, for which party, and on which policies (general liability, auto, umbrella, workers' compensation).
- Ask your agent for the endorsement by form number. For example: "Please add CG 20 01 for this written contract."
- Read the forms schedule. The declarations page lists every endorsement attached to the policy. Look for the PNC form or a carrier equivalent.
- Read the endorsement text. Confirm it refers to a written contract requirement and covers the party you are adding.
- Match the COI to the policy. The certificate's description should say what the endorsement says, no more and no less.
- Check the umbrella. If the contract requires umbrella limits on the same basis, ask whether the umbrella follows form.
- Calendar the renewal. Endorsements are tied to the policy term. At renewal, confirm the same form is still attached.
Sending the real paperwork, not just a certificate, is also what keeps vendors and project partners comfortable. Our partners' look at photography insurance requirements is a good example of how service businesses are asked to show that their actual policy documents meet a client's contract terms.
Perspective: why we ask for the form number up front
We see the same pattern every year. A contractor signs a contract, sends a certificate, and assumes the job is covered. Months later a claim arrives, and the endorsement was never on the policy.
As an independent agency, we can shop carriers and compare which ones offer primary and noncontributory wording for your trade and your contracts. That is the advantage of being independent: we are not tied to one company's forms.
Our advice is simple. Send us the contract before you sign it. We will read the insurance section with you, list the endorsements it calls for, and request them by form number. Then look at the issued policy together, not only the certificate.
You should never have to guess whether your coverage matches your contract.
Mike
Common mistakes to avoid
- Assuming a COI box is enough. The box describes the policy. It does not add anything to it.
- Requesting PNC on the wrong policy. Contracts may want it on general liability, commercial auto, and umbrella. Each policy needs its own wording.
- Forgetting the written contract. Because the standard wording depends on a written agreement, sign the contract before the loss, not after.
- Mixing up the three endorsements. Ask for additional insured, PNC, and waiver of subrogation separately, and confirm each one.
- Not checking renewals. A new term can come with a different form edition or a missing endorsement.
- Ignoring fleets. If your contract mentions vehicles, our guide to commercial auto symbols explains which vehicles your auto policy actually covers.
Get your contract insurance-ready
We are an independent insurance agency in Arlington, MA, with more than 30 years of experience helping contractors, property developers, and small businesses across multiple states. Our licensed agents can review your contract's insurance clause and request the endorsements it calls for through carriers we work with.
For general liability, workers' compensation, commercial property, commercial auto, and professional liability, see our business insurance page. If you are building, our builders risk insurance offers single-project and term policies, and builders risk is a specialty where we offer same-day binding. Ready to talk? Start from mfandtna.com and request a quote.
FAQ
What is a primary and noncontributory endorsement in simple terms?
It is an addition to your liability policy that says your coverage pays first for a covered claim, and your insurer will not ask another party's policy to share the cost. It is most often used with additional insured coverage on general liability policies.
Is primary and noncontributory the same as a waiver of subrogation?
No. PNC decides which policy pays first and whether insurers share the cost. A waiver of subrogation limits your insurer's right to recover from a responsible third party after paying a claim. Contracts often require both, so request each one by name.
Does the PNC note on my certificate of insurance mean I'm covered?
Not by itself. A certificate is evidence of coverage and does not change the policy. Ask your agent for the endorsement form and check it on the issued policy's forms schedule.
What form number is used for primary and noncontributory wording?
On general liability policies, ISO form CG 20 01 is the one most contracts name. Some carriers use their own wording, so ask your agent which form applies and what it says.
Sources
- Navigating additional insured requirements in commercial contracts
- ISO General Liability Additional Insured Endorsements
- Primary and Noncontributory Provisions and Priority of Coverage
- What is the Primary and Noncontributory Clause in Insurance
- The 2019 ISO Forms: Additions, Revisions, and Pitfalls
- Endurance Am. Specialty Ins. Co. v Harleysville Worcester Ins. Co. (NY 2020)
- Commercial Insurance in the United States: A Policyholder's Primer