SUBJECT: The Concept of ‘The Principle of Relativity of Contracts’

I. Introduction

This memorandum provides an exhaustive analysis of the principle of relativity of contracts under Philippine civil law. The principle, a cornerstone of the law on obligations and contracts, establishes that a contract is binding only upon the contracting parties, their heirs, and assigns. It emphasizes the personal and private nature of contractual relations, insulating third persons from the effects of an agreement to which they are neither party nor privy. This research will trace the principle’s statutory foundations, doctrinal applications, established exceptions, and its critical role in defining the boundaries of contractual liability.

II. Statutory Foundation

The principle is codified in the Civil Code of the Philippines. The primary provision is Article 1311:
“Contracts take effect only between the parties, their heirs and assigns, except in case where the rights and obligations arising from the contract are not transmissible by their nature, or by stipulation or by provision of law. The heir is not liable beyond the value of the property he received from the decedent.
If a contract should contain some stipulation in favor of a third person, he may demand its fulfillment provided he communicated his acceptance to the obligor before its revocation. A mere incidental benefit or interest of a person is not sufficient. The contracting parties must have clearly and deliberately conferred a favor upon the third person.”
This article encapsulates the general rule of relativity and its key exceptions: transmission to heirs and assigns, and stipulation pour autrui.

III. Core Doctrine and Rationale

The principle flows from the voluntary and consensual nature of contracts. Since a contract is a “law between the parties,” its force is limited to those who, through consent and meeting of the minds, have actively participated in its creation. It protects the autonomy of individuals from being bound by agreements they did not enter into. Conversely, it also prevents a third person from demanding benefits from a contract unless the exception under Article 1311 applies. The rationale is to ensure stability and predictability in private transactions, confining legal effects to the sphere of the contracting parties.

IV. Key Components: Parties, Heirs, and Assigns

Parties: The obligors and obligees who gave their consent.
Heirs: Universal successors who step into the shoes of a deceased party, but their liability is limited to the value of the inheritance (Article 1311, paragraph 1). Transmissibility is presumed unless the obligation is purely personal (intuitu personae).
Assigns: Refers to both assignees of rights (e.g., in assignment of credit) and transferees of obligations (requiring consent of the obligee). An assign stands in the place of the original party, making the contract binding upon them.

V. The General Rule: Effects on Third Persons

As a rule, a third person—someone who is not a party, heir, or assign—cannot be adversely affected by a contract. He cannot be sued for specific performance or for damages based on a contract to which he is a stranger. For instance, a supplier (X) who has a contract only with a contractor (Y) cannot sue the project owner (Z) for payment based on that contract, as Z is a third person to the X-Y agreement. Similarly, a third person generally cannot enforce benefits under a contract, unless he falls under an exception.

VI. Established Exceptions to the Principle

The principle is not absolute. Jurisprudence and the Civil Code recognize several exceptions where a third person may be bound or benefited:

Stipulation pour autrui (Stipulation in favor of a third person) under Article 1311, paragraph 2.

Contracts creating real rights (e.g., mortgage, easement) which, once registered, bind the whole world.

Contracts with third-party effects under special laws (e.g., labor laws making collective bargaining agreements binding on all employees).

Negotiorum gestio (unauthorized management) where a third person voluntarily manages the affairs of another without consent.

Trusts, where the beneficiary, though not a party to the trust instrument, can enforce its terms.

Leases registered under the Property Registration Decree bind successors-in-interest of the lessor.

Warranties in sales, which extend to eviction suffered by a third person under certain conditions.

Simulated contracts that prejudice third persons may be annulled by them.

Alter ego doctrine, where a corporation’s separate juridical personality is pierced to hold shareholders liable for a corporate contract.

Tortious interference with contractual relations, where a third person who knowingly induces a breach becomes liable in damages.

VII. Stipulation Pour Autrui: A Detailed Analysis

This is the most significant and litigated exception. For a stipulation pour autrui to be valid and enforceable by the third-party beneficiary, all these elements must concur:

The stipulation must be part of a valid contract.

The contracting parties must have clearly and deliberately conferred a benefit upon the third person. A mere incidental benefit is insufficient.

The third person must have communicated his acceptance to the obligor before the stipulation is revoked.

The third-party beneficiary may be creditor-beneficiary (where the promisee intends to satisfy a debt owed to the third party) or donee-beneficiary (where the intent is to confer a gift). The right of the third-party beneficiary vests upon his acceptance, after which the contracting parties cannot rescind or modify the stipulation without his consent.

Aspect	Philippine Law (Civil Law Tradition)	Common Law (e.g., U.S., U.K.)
Governing Principle	The principle of relativity of contracts is the default rule, explicitly codified in Article 1311.	The doctrine of privity of contract is the traditional common law rule.
Statutory Basis	Express provision in the Civil Code.	Judge-made doctrine, though often modified by statute (e.g., Contracts (Rights of Third Parties) Act 1999 in the U.K.).
Third-Party Beneficiary Rights	Strict requirements under Article 1311(2): clear conferral of benefit and communication of acceptance.	More liberal recognition, especially for intended beneficiaries (both creditor and donee beneficiaries). Modern statutes often allow enforcement if the contract purports to confer a benefit, even without acceptance.
Effect on Heirs/Assigns	Explicitly covered by the code (heirs and assigns are considered within the “relativity” sphere).	Similar practical effect, though often analyzed under rules of succession and assignment law.
Key Conceptual Difference	Viewed as a natural consequence of the personal, consensual nature of contracts.	Historically viewed as a procedural and evidentiary rule to prevent actions by non-parties.

VIII. Illustrative Jurisprudence

Adelfa Properties, Inc. v. CA (1992): Emphasized that a third person* cannot be bound by a contract to which he is a stranger. A buyer from a vendor cannot be compelled to comply with the vendor’s separate contract with another.
Nepomuceno v. CA (1993): Held that a stipulation pour autrui requires a clear intent to benefit a third person*. A contract for the sale of land that mentioned an existing tenant did not create a stipulation in the tenant’s favor for a new lease.
Sps. Litonjua v. L & R Corp (2004): Clarified that for a stipulation pour autrui, the benefit must be the cause or consideration* for the parties entering into the contract, not a mere incidental consequence.
Prudential Bank v. Panis (1994): Applied the alter ego* doctrine as an exception, piercing the corporate veil to hold stockholders personally liable for a corporate contract due to bad faith.

IX. Practical Implications and Litigation Considerations

In litigation, the principle is a frequent ground for a motion to dismiss based on lack of cause of action. A plaintiff must demonstrate he is a party, heir, assign, or a third-party beneficiary under a valid stipulation pour autrui. Practitioners drafting contracts must be explicit: to extend benefits to third persons, clear stipulation pour autrui language must be used, and the intended beneficiary should formally accept. To bind successors, registration of real rights or specific clauses on assignability are crucial.

X. Conclusion

The principle of relativity of contracts remains a fundamental doctrine in Philippine civil law, safeguarding the autonomy of contracting parties. While its general rule is strictly enforced, the well-defined exceptions, particularly the stipulation pour autrui, provide necessary flexibility to accommodate complex transactions and intentional conferment of benefits upon third persons. A thorough understanding of this principle and its exceptions is essential for effective contract drafting, legal strategy, and the accurate adjudication of disputes arising from contractual relations.