Primary and Non-Contributory

Last updated October 13, 2026

How primary and non-contributory works

Two policies can sometimes cover the same claim, and each contains an "other insurance" condition that decides which pays first or whether they share. Without special wording, coverage for an additional insured may sit behind that party's own insurance or be shared with it.

"Primary" means the policy responds first, before other insurance available to the additional insured. "Non-contributory" means the insurer gives up its right to seek contribution from the other party's insurers, as IRMI explains, so the losses are not split between the policies. The ISO endorsement CG 20 01 does this for commercial general liability policies. It typically applies on a blanket basis to parties the named insured agreed in a written contract to protect, and the contract generally must be signed before the loss.

Example

What to watch for

• It is not the same as additional insured status. CG 20 01 changes the order of payment. A separate additional insured endorsement is still needed to add the party.
• The written contract requirement matters. Wording differs by carrier, and some forms apply only if the contract requires it.
• Limits still apply. The wording does not create unlimited coverage or extend beyond the policy's scope.
• Other policies, such as an umbrella, may need their own wording. Ask whether they follow form when a contract requires it.
• Pair it with a waiver of subrogation only if the contract asks for both. They are separate provisions.

How "other insurance" decides who pays first

When more than one policy could respond to a claim, the policies' "other insurance" conditions decide the order. In general terms, there are three outcomes:

• Primary. The policy responds first, up to its limit, and its duty to defend may follow the same order, depending on the wording.
• Excess. The policy responds only after other available insurance has paid, or after its own underlying limits are exhausted. An umbrella is an example of excess coverage.
• Contributing. Two policies share the loss, often in proportion to their limits or in equal shares, depending on the wording.

Primary and non-contributory wording addresses this by making your policy primary for the party the contract names, and by preventing your insurer from asking the other party's insurer to contribute. Without it, a landlord, customer or other counterparty's own policy may be pulled in, which can raise questions about whose limits and whose claims history take the hit.

How it relates to similar provisions

• Additional insured status adds a party to your policy. Primary and non-contributory sets the order in which policies respond. They are usually requested together but they are different endorsements.
• Waiver of subrogation stops your insurer from pursuing a party after paying a claim. See subrogation. It is a separate provision.
• A certificate of insurance reports that coverage exists, but it generally does not change the policy. The endorsement does.
• Indemnity clauses in a contract are promises between the parties. Insurance wording is what lets an insurer pay on those promises, and the two need to fit together.
• Umbrella follow-form wording may be needed so the umbrella also responds in the required order. Do not assume it does.

A second example: an enterprise customer's master agreement

Common mistakes

• Signing a contract that requires primary and non-contributory terms without checking that the policy can meet them.
• Relying on a certificate of insurance as proof. The policy endorsement is what counts.
• Forgetting that the wording often applies only where a written contract requires it and where the contract was signed before the loss.
• Assuming it applies to every policy. It is common on general liability and may be requested on auto and umbrella, and it is not always available on professional or cyber policies.
• Treating it as a limit increase. It changes the order of payment only.
• Failing to pass the same requirements down to subcontractors or vendors when your own contract requires it.

Questions to ask your broker

• Does our policy include primary and non-contributory wording, and is it blanket or scheduled by party?
• Does it apply only when a written contract requires it, and does it require the contract to predate the loss?
• Does our umbrella or excess policy follow the same order of payment?
• Is there any additional premium for the wording?
• Can it be added to our other liability lines if a contract asks for it?
• What does our certificate say, and does it match the endorsement?

Why it matters for technology, AI, fintech and digital-asset companies

Enterprise customer agreements, master services agreements, and real estate leases often require additional insured, primary and non-contributory, and waiver of subrogation terms on general liability. Review these clauses before signing and ask your broker to confirm the general liability policy can meet them.

Technology companies often meet these terms first in a customer's vendor requirements, a data center or office lease, or a platform agreement with a partner. Contracts frequently ask for the same wording across several policies, including cyber and technology E&O, which may not offer it in the same way as general liability. When a company is negotiating its first enterprise deals, a short review of the insurance clause with your broker can prevent delays at signing. See cyber and technology E&O and data centers. For the policy mechanics, read about endorsements and commercial general liability, and check how the limit of liability would be shared.

See how this applies in practice: insurance requirements in enterprise contracts.

Related terms

Frequently asked questions