Third-Party Beneficiaries
A third-party beneficiary is someone who can enforce a contract even though they didn't sign it or negotiate its terms. This area of contract law matters because it's one of the few situations where a non-party gains legal rights under an agreement. The key distinction you need to master is the line between intended and incidental beneficiaries, since only one category can actually sue.
Third-Party Beneficiaries in Contracts
A third-party beneficiary is an individual or entity who is not a party to a contract but has enforceable rights under it. For those rights to exist, the contracting parties must have intended to confer a benefit on the third party at the time they formed the contract. A classic example is a life insurance policy: the policyholder (promisee) contracts with the insurance company (promisor) to pay a death benefit to a named beneficiary who never signed anything.
- Once a third-party beneficiary's rights have vested, the contracting parties can no longer modify or rescind the contract without the beneficiary's consent. Think of employee benefits locked in under a collective bargaining agreement.
- A third-party beneficiary can sue to enforce the contract and recover damages for breach. For instance, a subcontractor may sue a general contractor for payment owed under the terms of the prime contract if the subcontractor qualifies as an intended beneficiary.

Intended vs. Incidental Beneficiaries
This distinction is the most tested concept in this topic. Whether a third party can enforce the contract depends entirely on which category they fall into.
Intended beneficiaries are those the contracting parties specifically meant to benefit. The intent must be clear and direct. Examples include:
- A named beneficiary in a life insurance policy
- A trust beneficiary designated in a trust agreement
- A creditor who is owed money, where the promisor agrees to pay the promisee's debt directly to that creditor (called a creditor beneficiary)
Intended beneficiaries have enforceable rights and can bring suit if the promisor fails to perform.
Incidental beneficiaries are third parties who happen to benefit from a contract's performance, but the contracting parties never intended to give them any rights. Examples include:
- A pedestrian who benefits when a city hires a construction company to repair sidewalks. The city contracted for the repair, not to give that specific pedestrian an enforceable right.
- A local business that sees increased foot traffic because of a nearby construction project funded by contract.
Incidental beneficiaries cannot sue to enforce the contract or recover damages, no matter how much they benefit from it.
The test is intent: did the contracting parties intend to benefit this specific third party (or a class they belong to), or is the benefit just a side effect of performance?

Enforcement Rights of Third Parties
For a third-party beneficiary to successfully enforce a contract, several requirements must be met:
- Intent to benefit: The contracting parties must have intended to confer a benefit on the third party. This intent should be clear from the contract language or the surrounding circumstances.
- More than incidental benefit: The benefit to the third party must be substantial and direct, not a mere byproduct of performance.
- Reasonable identification: The third-party beneficiary must be identified with reasonable certainty. This doesn't always mean by name; a defined class (such as "all employees" or "all customers") can be sufficient.
- Vesting of rights: The beneficiary's right to performance must have vested. Before vesting, the contracting parties can still modify or cancel the contract. Rights vest when any of the following occurs:
- The beneficiary materially changes position in justifiable reliance on the promise (e.g., purchasing a home based on a promise of financing)
- The beneficiary manifests assent to the promise at the promisor's request (e.g., accepting an offer of services)
- The beneficiary brings a lawsuit to enforce the promise
Once vesting occurs, the beneficiary's rights are locked in, and the original parties lose the power to alter or eliminate them.
Defenses Against Beneficiary Claims
Even when a third party qualifies as an intended beneficiary, the promisor is not without defenses. Here are the main ones:
- Lack of intent to benefit: The promisor can argue the parties never intended to create enforceable rights for the third party, especially where contract language is ambiguous.
- Modification or rescission before vesting: If the beneficiary's rights have not yet vested, the contracting parties remain free to modify or rescind the contract without the beneficiary's consent.
- Failure to satisfy conditions precedent: If the contract requires certain conditions to be met before the third party's rights arise (e.g., submitting required documentation), failure to meet those conditions defeats the claim.
- Statute of limitations: The promisor can assert that the beneficiary's claim was filed after the applicable statutory deadline.
- Defenses available against the promisee: Any defense the promisor could raise against the promisee also works against the third-party beneficiary. This includes duress, fraud, lack of consideration, and unconscionability. If the underlying contract is voidable, the beneficiary's rights fall with it.