Complete Primary and Noncontributory Endorsements Guide for Insurance Agencies

A primary and noncontributory endorsement is a policy modification that forces the named insured's liability policy to respond before any other available insurance and prevents the insurer from seeking contribution from the upstream party's coverage. In plain language: when a general contractor requires a subcontractor to name them as additional insured on a "primary and noncontributory" basis, the subcontractor's carrier pays first, alone, and cannot ask the contractor's own carrier for reimbursement.

The endorsement is cheap. It is standard in most contracts. Yet agencies still issue certificates with the wrong ISO form number, miss the "noncontributory" requirement, or attach the endorsement to the wrong policy line. Every one of those errors shows up later as a denied claim or a breach-of-contract notice. This guide covers the forms, the contract language, carrier rules, and the workflow that prevents those errors.

Key Takeaways

• The current ISO primary and noncontributory endorsement is CG 20 01 04 13, which modifies the "Other Insurance" condition in a CGL policy
• A primary endorsement and a noncontributory endorsement are technically two different obligations, usually combined in one form
• Carriers typically charge $0 to $150 per policy for blanket primary and noncontributory wording; per-certificate endorsements run $50 to $250
• The endorsement only works if paired with additional insured status; primary wording alone on a named insured's own policy does nothing for the upstream party
• Admitted carriers like Hartford, Travelers, and Chubb offer blanket forms; many E&S carriers require scheduled endorsements with the upstream party listed by name
• A certificate of insurance that states "primary and noncontributory" in the description box without an actual endorsement attached is not binding
• New York and California courts have both enforced contract language requiring primary and noncontributory wording even when the issued policy did not include it, exposing the agent to E&O

What Primary and Noncontributory Actually Means

The phrase combines two separate insurance concepts that contracts almost always bundle together.

Primary refers to the order in which policies respond to a loss. Under standard "Other Insurance" clauses, liability policies default to pro-rata sharing or excess status depending on how the claim is structured. A primary endorsement overrides that default and declares this policy pays first.

Noncontributory refers to what happens after this policy pays. Without noncontributory wording, the paying insurer retains the right to seek contribution from any other applicable policy. The noncontributory clause gives up that right. The additional insured's own policy stays untouched, its limits undamaged, its loss runs unaffected.

The two obligations sound the same to most producers. Legally they are not. A policy can be primary without being noncontributory, which means it pays first but then pulls money back from the other insurer. It can also be noncontributory without being primary, which creates circular logic that courts have resolved inconsistently. Contracts demand both together for a reason. So should your endorsements.

Read our primary and noncontributory glossary entry for the short-form definition. The rest of this guide covers application.

The ISO Forms That Matter

Most standard commercial general liability policies use ISO forms. Knowing the correct form number is how you move from "I think we have primary and noncontributory" to "we have it, here is the form, attached to policy effective January 1."

CG 20 01 04 13 is the current ISO primary and noncontributory endorsement. It modifies Section IV, paragraph 4 (the "Other Insurance" condition). The form applies when a written contract requires the named insured's CGL coverage to be primary and noncontributory for a specific additional insured. Earlier editions existed (12 04, 07 04), but most carriers adopted the 04 13 version when ISO released it.

CG 20 10 04 13 and CG 20 37 04 13 are the additional insured forms most often paired with primary and noncontributory wording. CG 20 10 covers ongoing operations. CG 20 37 covers completed operations. A contractor who needs coverage for work done on a project after completion needs both, not just CG 20 10.

CG 20 38 04 13 is the blanket additional insured endorsement for owners, lessees, or contractors when the contract requires automatic status. Read our blanket additional insured entry for the mechanics of blanket forms.

The practical rule: check the three endorsement numbers on every liability policy your agency issues for commercial accounts. If any are missing or outdated, the policy will not respond the way the contract assumes.

When Contracts Require It

Primary and noncontributory language shows up in five contract types, each with its own triggers.

Construction contracts. Every AIA A201 general conditions document requires primary and noncontributory coverage from subcontractors to the general contractor. ConsensusDocs has similar language. The contractor's risk manager builds this into the template and refuses to sign without it. Subcontractors who push back lose the job.

Commercial leases. Landlords routinely require tenants to carry primary and noncontributory coverage naming the landlord as additional insured. The lease language typically reads: "Tenant's insurance shall be primary and noncontributory with respect to any insurance carried by Landlord." Without it, a slip-and-fall in the tenant's premises could hit the landlord's policy first, damaging its loss runs.

Vendor and services agreements. Manufacturers and technology vendors require primary and noncontributory wording from service providers who enter their facilities. Amazon, Walmart, and most Fortune 500 companies include it in their standard procurement contracts.

Franchise agreements. Franchisors require franchisees to maintain primary and noncontributory coverage naming the franchisor. The franchise disclosure document discloses this as an insurance requirement.

Professional services contracts. Architects, engineers, and consultants often get pushed to make their professional liability primary and noncontributory for specific project owners. This is more contested than CGL wording because professional liability policies historically treat "Other Insurance" differently.

The producer's job is to read the contract, extract the specific insurance requirements, and verify the policy actually meets them. Not "has primary and noncontributory language somewhere." Meets the contract.

How Primary and Noncontributory Appears on a Certificate

Certificates are where most errors happen. A certificate of insurance is a snapshot. It does not change the policy. Writing "Primary and Noncontributory" in the description box of an ACORD 25 does not add the endorsement to the policy. It just asserts the endorsement exists.

Three failure modes repeat:

Certificate claims coverage that does not exist. The description box states "Primary and Noncontributory" but the policy has no CG 20 01 endorsement. When a claim occurs, the carrier pays on a pro-rata basis or tries to recover contribution. The additional insured sues the producer for breach of the certificate.

Certificate lists wrong form edition. The description references CG 20 10 07 04 instead of CG 20 10 04 13. The contract requires the 04 13 edition because it clarified coverage for ongoing operations. An earlier edition may exclude the very loss the contract anticipated.

Certificate includes the additional insured form but skips the primary and noncontributory form. The AI endorsement is attached. Primary and noncontributory is not. The policy responds on a pro-rata basis, pulling money from the additional insured's own insurer.

Our COI Manager validates every certificate against the underlying policy and flags descriptions that are not supported by attached endorsements. The rule we enforce: if the certificate says it, the policy must contain it, with the right ISO form number and edition date.

Premium Impact and Carrier Variance

Carriers handle primary and noncontributory in one of three ways.

Included in the base form. Many admitted carriers bundle primary and noncontributory into their base CGL wording through a proprietary endorsement. Travelers, Hartford, and Liberty Mutual offer blanket wording that applies to any additional insured where a written contract requires primary and noncontributory coverage. Premium is already loaded into the base rate. No scheduled endorsement required.

Charged per policy as a flat endorsement. Some carriers charge $0 to $150 per policy to add blanket primary and noncontributory wording. Chubb and AIG use this model on middle-market commercial accounts. The endorsement attaches for the policy term; no per-certificate action needed.

Charged per certificate on a scheduled basis. E&S carriers and some specialty admitted markets require the additional insured to be scheduled by name. Each certificate triggers a scheduled endorsement, each endorsement generates a premium charge of $50 to $250. This model is common in contractors liability, habitational, and hard-to-place risks.

Producers quoting commercial accounts need to know which model each carrier uses before binding. A contractor who signs a 50-subcontractor agreement and expects blanket coverage will be unpleasantly surprised when their E&S carrier generates 50 individual endorsements at $175 each.

State-Specific Wrinkles

The federal system means primary and noncontributory rules vary by state.

California courts have consistently enforced contract language requiring primary and noncontributory coverage. In Transport Insurance Co. v. Superior Court (2014), the California Supreme Court held that an insurer's duty to contribute is modified by the noncontributory clause between insureds. Producers who fail to match the policy to the contract face direct E&O exposure.

Texas applies a narrower rule. Texas courts have treated anti-subrogation principles as limiting what "noncontributory" can accomplish when the loss involves the named insured's own property. Producers writing Texas-based construction accounts should verify how the carrier's endorsement reads under Texas insurance code Chapter 151.

New York enforces primary and noncontributory strictly. New York Labor Law Section 240 creates absolute liability for owners and contractors in construction accidents, making the order of insurance response financially consequential. A missing primary and noncontributory endorsement in a New York construction loss can mean a contractor's own policy absorbs a $3 million claim that should have gone to the subcontractor's carrier.

Florida follows standard principles but has statutory limitations on how certificates can represent coverage. Florida Statute 627.426 governs what certificates can and cannot say. Certificate descriptions that exaggerate coverage can be prosecuted as unfair insurance practices.

The Operational Workflow

Every commercial account with any contractual primary and noncontributory requirement needs this workflow:

1. Extract insurance requirements from the contract. Read the actual contract. Note the exact wording for primary and noncontributory, additional insured, waiver of subrogation, and coverage limits.
2. Match to the carrier's available endorsements. Verify the carrier offers the required endorsement and whether it is blanket, scheduled, or per-certificate.
3. Confirm attachment on the policy. Before issuing any certificate, confirm the endorsement is attached with the correct form number and edition date.
4. Document the requirement in the client file. Store the contract, the endorsement, and the issued certificate together. This is the E&O file for this client's compliance position.
5. Flag renewal for continued compliance. If the contract continues past the policy term, the renewal must include the same endorsements. Carrier changes at renewal can drop primary and noncontributory without notice.

See our guides on contract review workflow and renewal-time certificate verification for deeper operational breakdowns.

Relationship to Waiver of Subrogation and Loss Payee Provisions

Primary and noncontributory sits alongside two other contractual insurance requirements that often appear together.

Waiver of subrogation prevents the insurer from seeking recovery against a third party after paying a claim. Primary and noncontributory affects the order of insurance response; waiver of subrogation affects the insurer's post-claim recovery. Most construction and lease contracts require both.

Loss payee designations give a third party rights in first-party property coverage, most commonly lenders or lessors. See our loss payee entry for mechanics. Loss payee is a property concept; primary and noncontributory is a liability concept. Contracts that require all three require endorsements on both the property and liability policies.

Common E&O Claims Involving Primary and Noncontributory

Three patterns generate most of the E&O claims in this area.

Certificate issued without supporting endorsement. Agency staff typed "Primary and Noncontributory" into the description box to satisfy a contractor's request. The policy never carried the endorsement. Loss occurs, carrier responds pro-rata, contractor's insurer pays half, contractor sues the agency. Settlement range: $25,000 to $500,000 depending on loss severity.

Wrong edition date specified. Certificate references CG 20 10 07 04, an older edition that excludes some ongoing operations losses. The contract required the 04 13 edition. Claim falls into the exclusion. Agency bears the coverage gap.

Renewal moved to carrier that does not offer equivalent wording. Producer remarkets the account and binds with a carrier whose blanket primary and noncontributory has narrower triggers. Client continues sending certificates with old wording. First claim reveals the gap. Loss run increases the next renewal cost, and the original contract breach creates damages on top.

All three failure modes are visible in the policy file and the certificate archive. An automated check against ISO form numbers catches them before they become claims.

Primary and Noncontributory on Policies Other Than CGL

Most discussion focuses on general liability. Contracts increasingly require primary and noncontributory wording on other lines.

Commercial auto. ISO form CA 04 49 modifies the "Other Insurance" condition in the business auto coverage form to add primary and noncontributory wording. Transportation and delivery contracts routinely require this for hired and non-owned auto coverage.

Umbrella and excess liability. Umbrella policies follow the underlying primary policy's other insurance wording in most cases, but some contracts explicitly require the umbrella to be primary and noncontributory. The relevant endorsements are carrier-proprietary; no standard ISO form exists.

Workers compensation. Workers comp primary and noncontributory is redundant under most state laws because workers comp is already exclusive-remedy insurance. Some contracts request it anyway. The appropriate response is to explain the statutory framework and refuse wording that serves no purpose.

Professional liability. Primary and noncontributory on professional liability is contested. Some carriers endorse it; many refuse. The contract review should push back on PL primary and noncontributory requirements unless the contract specifically justifies it.

Before You Issue the Next Certificate

Run this checklist on the next commercial policy where a certificate is requested.

• Contract has been read, not just skimmed
• Primary and noncontributory wording has been verified in the contract
• ISO form CG 20 01 04 13 or equivalent is attached to the policy
• Additional insured form (CG 20 10, CG 20 37, or CG 20 38) is attached
• Form edition dates match contract requirements
• Premium impact has been confirmed and disclosed
• Certificate description accurately reflects attached endorsements
• Documentation is filed in the client record
• Renewal flag is set to re-verify at the next renewal

Frequently Asked Questions

What is a primary and noncontributory endorsement?

A primary and noncontributory endorsement is a modification to a liability policy that makes the named insured's coverage respond first for a specified additional insured and prevents the insurer from seeking contribution from the additional insured's own coverage. It is usually required by contract in construction, lease, and vendor agreements.

Which ISO form provides primary and noncontributory coverage (CG 20 01)?

ISO form CG 20 01 04 13 is the current standard primary and noncontributory endorsement. It modifies the "Other Insurance" condition of a commercial general liability policy to require the coverage to be primary and to waive the insurer's right to seek contribution. The endorsement must be paired with an additional insured form (CG 20 10, CG 20 37, or CG 20 38) to be operationally meaningful.

When is primary and noncontributory required in a contract?

Primary and noncontributory is required in most construction subcontracts (AIA A201, ConsensusDocs), commercial leases, vendor service agreements with Fortune 500 buyers, franchise agreements, and large professional services contracts. The requirement typically appears in the insurance section of the contract alongside additional insured and waiver of subrogation language.

Does primary and noncontributory change premium cost?

It depends on the carrier. Some admitted carriers (Travelers, Hartford, Liberty Mutual) include blanket primary and noncontributory in the base CGL form at no additional charge. Others charge a flat $0 to $150 annual endorsement premium. E&S carriers often charge $50 to $250 per scheduled certificate. Producers should confirm the pricing model before quoting commercial accounts with contractual requirements.

What is the difference between primary and noncontributory and a waiver of subrogation?

Primary and noncontributory affects the order of insurance response and prevents the insurer from seeking contribution from the additional insured's carrier. Waiver of subrogation prevents the insurer from pursuing recovery against a third party after paying a claim. Contracts usually require both, but they accomplish different things. Primary and noncontributory is pre-payment ordering; waiver of subrogation is post-payment recovery.

Can a carrier refuse a primary and noncontributory endorsement?

Yes. Carriers can decline to endorse any coverage they choose to offer. Some E&S markets refuse primary and noncontributory on high-hazard classes, requiring the insured to find alternative coverage or negotiate contract language changes. Admitted carriers in competitive classes usually offer it. When a carrier refuses, the producer must either find a different carrier or advise the client to renegotiate the contract before signing.

Written by Javier Sanz, Founder of BrokerageAudit. Last updated April 2026.

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