The principle of relativity of contracts is a core characteristic of Philippine contract law that every Bar candidate must internalize for the 2026 Examinations. It defines the precise boundaries of who may enforce or be burdened by a contract. Essay questions routinely test this principle through fact patterns involving heirs, assignees, third-party beneficiaries, or complete strangers to the agreement. Success requires stating the codal rule accurately, identifying whether an exception applies, and applying the rules methodically to the given facts.

Core Legal Basis and Definition

The controlling provision is Article 1311 of the Civil Code:

Contracts take effect only between the parties, their assigns and heirs, 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 a third person.

This article embodies the principle of relativity of contracts (also known as privity of contract). It means that a contract creates personal rights and obligations that bind only those who are privy to it—the contracting parties and their successors-in-interest (heirs and assigns). As a general rule, the contract cannot favor or prejudice third persons who are strangers to it. This is expressed in the maxim res inter alios acta aliis neque nocet prodest (things done between others neither benefit nor harm a third person).

Essential Requisites / Elements / Components

For the general rule (first paragraph of Article 1311):

A valid contract exists between the parties.
The persons claiming rights or being held liable must be either (a) original contracting parties, (b) assigns (through valid assignment), or (c) heirs (by operation of succession).
Rights and obligations must be transmissible. Non-transmissibility occurs when they are non-transmissible by their nature (intuitu personae—e.g., contracts requiring personal skill, trust, or qualifications of a specific person), by stipulation of the parties, or by provision of law.

For heirs specifically: They are bound by the decedent’s contracts, but their liability is strictly limited to the value of the property they actually received from the estate. They are not personally liable beyond that value.

For the principal exception—stipulation pour autrui (second paragraph of Article 1311): A third person who is not a party to the contract may demand its fulfillment if the following requisites concur (as consistently held in jurisprudence):

There is a stipulation in favor of a third person.
The stipulation is a part, not the whole, of the contract.
The contracting parties clearly and deliberately conferred a favor upon the third person (a mere incidental benefit or interest is insufficient).
The third person communicated his acceptance to the obligor before its revocation.
Neither of the contracting parties represents, or is authorized by, the third person.

All five elements must be present; the absence of any one defeats the third person’s right to enforce the stipulation.

Landmark Supreme Court Doctrines

These doctrines from the main opinions remain controlling:

Integrated Packaging Corp. v. Court of Appeals, G.R. No. 115117, June 8, 2000: The basic civil law principle of relativity of contracts provides that contracts can only bind the parties who entered into it, and it cannot favor or prejudice a third person, even if he is aware of such contract and has acted with knowledge thereof.
South Pachem Development, Inc. v. Court of Appeals, G.R. No. 126260, December 16, 2004: The requisites of a stipulation pour autrui are: (1) there must be a stipulation in favor of a third person; (2) the stipulation must be a part, not the whole, of the contract; (3) the contracting parties must have clearly and deliberately conferred a favor upon a third person, not a mere incidental benefit or interest; (4) the third person must have communicated his acceptance to the obligor before its revocation; and (5) neither of the contracting parties bears the legal representation or authorization of the third party.
CCC Insurance Corporation v. Kawasaki Steel Corporation, G.R. No. 156162, June 22, 2015: According to the principle of relativity of contracts in Article 1311 of the Civil Code, a contract takes effect only between the parties, their assigns, and heirs; except when the contract contains a stipulation in favor of a third person, which gives said person the right to demand fulfillment of said stipulation.
Rapid City Realty and Development Corporation v. Paez-Cline, G.R. No. 217148, December 7, 2021: A contract takes effect only between the parties who had entered into it, or their successors who have assumed their personality or their juridical position; and as a consequence, such contract can neither favor nor prejudice a third person (in conformity with the axiom res inter alios acta aliis neque nocet prodest). A person who is not a party thereto, or an assignee thereunder, has no legal capacity to challenge its validity.

Key Exceptions, Qualifications, and Distinctions

Exceptions where a contract may produce effects on third persons:

Stipulation pour autrui (Art. 1311, par. 2) — the third person gains the right to demand performance upon timely acceptance.
Contracts creating real rights (Art. 1312): “In contracts creating real rights, third persons who come into possession of the object of the contract are bound thereby, subject to the provisions of the Mortgage Law and the Land Registration Laws.” Registered real rights (e.g., mortgage, usufruct) have erga omnes effect and bind subsequent possessors or purchasers.
Other instances provided by law (e.g., certain provisions on agency, subrogation, or succession).

Important qualifications:

Heirs are bound but only to the extent of the inheritance received.
Non-transmissible obligations (intuitu personae) are not passed to heirs or assigns even without contrary stipulation.
Registration is often decisive for real rights to affect third persons.

Critical distinctions frequently tested:

Relativity of contracts (personal rights) vs. absoluteness of real rights: Contractual obligations are relative and bind only parties; real rights, once constituted and registered, bind the whole world.
Stipulation pour autrui vs. incidental benefit: Only the former gives the third person an enforceable right. Indirect or accidental benefits (e.g., a subcontractor who benefits from timely payment under the main contract) do not qualify.
Article 1311 (relativity) vs. Article 1314 (inducing breach of contract): Article 1311 prevents third persons from being bound or benefited by the contract itself. Article 1314 makes a third person who induces a party to violate the contract liable for damages in tort, without making that third person a contracting party.
Privity of contract vs. privity of estate: The former concerns personal obligations; the latter arises in property relations (e.g., landlord-tenant or successive owners).

How This Topic Appears in Bar Essay Questions

Examiners commonly present:

A contract between A and B containing a clause that appears to benefit C (test whether it is a valid pour autrui).
A deceased party’s contract and an heir who refuses to perform (test transmissibility and the heir’s limited liability).
A stranger (C) who sues or is sued under a contract to which he is not a party, or who claims rights despite having knowledge of the contract.
A contract creating a real right (e.g., mortgage or lease) that is unregistered, with a subsequent buyer or possessor claiming freedom from it.

What the examiner usually wants: A clear determination of who has rights or obligations and why, supported by Article 1311 (and Art. 1312 when real rights are involved).

Common mistakes to avoid:

Assuming that mere knowledge of the contract by a third person makes him bound or entitled (it does not).
Treating every benefit to a third person as pour autrui without checking the five requisites, especially the “clearly and deliberately conferred” and timely acceptance elements.
Forgetting the limitation on an heir’s liability.
Confusing this topic with mutuality (Art. 1308) or consensuality.

Recommended answer structure for maximum points:

State the governing rule with direct reference to Article 1311.
Explain the general rule and the applicable exception(s).
Apply each element or requisite to the specific facts one by one.
Conclude with the precise legal effects on each person involved.

Practical Application Tips or Memory Aids

Mnemonic for pour autrui requisites (S-P-C-A-N):

Stipulation in favor of a third person
Part (not the whole) of the contract
Clearly and deliberately conferred favor (not incidental)
Acceptance communicated to the obligor before revocation
No representation or authorization by the contracting parties of the third person

Quick comparison table for review:

Aspect	General Rule (Art. 1311, par. 1)	Stipulation Pour Autrui (Art. 1311, par. 2)	Real Rights (Art. 1312)
Persons affected	Only parties, assigns, heirs (limited)	Third-person beneficiary (if all requisites met)	Third persons in possession (if registered)
Effect on strangers	None (res inter alios acta)	Enforceable right upon timely acceptance	Binding if real right is registered
Key test	Privity of contract	Clear deliberate intent + acceptance	Creation of real right + registration

Drafting tip: In every essay answer, open with: “Under Article 1311 of the Civil Code, contracts take effect only between the parties, their assigns and heirs...” This immediately demonstrates mastery of the codal basis and earns structural points.

Key Takeaways

Contracts are relative: they bind only the parties and their successors-in-interest (heirs and assigns), subject to rules on transmissibility. Third persons who are strangers to the contract are generally neither favored nor prejudiced.
Heirs are bound by the decedent’s contracts but only up to the value of the property received.
Stipulation pour autrui is a strict exception—all five requisites must concur; incidental benefits do not suffice.
Article 1312 provides another exception: registered contracts creating real rights bind third persons in possession.
The maxim res inter alios acta is your constant companion: a contract between A and B cannot be invoked by or against C, even if C knows of it.
In Bar essays, always cite Article 1311 first, then methodically apply the general rule or the pour autrui/real-rights exception to the facts. Distinguish this principle from related concepts (especially Art. 1314) to show depth.

Master these rules and their precise application, and you will handle any essay question on relativity with clarity and confidence.