The Civil Code of the Philippines, embodied in Republic Act No. 386 and effective since August 30, 1950, codifies the law on obligations and contracts in Book IV. This Book establishes the foundational rules governing juridical relations arising from voluntary agreements, legal impositions, and other sources, reflecting a blend of Spanish civil law traditions with adaptations suited to Philippine sovereignty and jurisprudence. Title I (Articles 1156 to 1304) regulates obligations, while Title II (Articles 1305 to 1422) governs contracts in general. These provisions underscore the principles of justice, equity, good faith, and the binding force of agreements within the limits of law, public order, policy, good morals, and customs.

Title I: Obligations

General Provisions (Articles 1156–1162)

An obligation is a juridical necessity to give, to do, or not to do (Art. 1156). It creates a personal bond between the obligor (debtor) and the obligee (creditor), enforceable in courts. Obligations bind the heirs and successors of the parties, subject to the limits of the law, the nature of the obligation, and the rights of third persons (Art. 1159).

The five sources of obligations are: (1) law; (2) contracts; (3) quasi-contracts; (4) delicts or acts or omissions punished by law; and (5) quasi-delicts or torts (Art. 1157). Obligations derived from law are not presumed; they must be expressly determined by statute (Art. 1158). Contracts give rise to obligations only when they meet the essential requisites prescribed by law. Quasi-contracts arise from lawful, voluntary, and unilateral acts to prevent unjust enrichment (e.g., negotiorum gestio and solutio indebiti). Civil liability from delicts is governed by penal laws, subject to subsidiary rules in the Code. Quasi-delicts impose liability for fault or negligence causing damage, without prior contractual relation.

Obligations may be civil (enforceable by court action) or natural (based on equity and morality but not enforceable, though voluntary performance cannot be recovered once made) (Arts. 1423–1430).

Nature and Effect of Obligations (Articles 1163–1178)

The obligor must fulfill the obligation with diligence, observing the standard of a “good father of a family” unless the law or stipulation requires a higher degree (Art. 1163). For obligations to give a specific thing, the obligor must deliver the thing itself, preserve it with due care, and bear the risk of loss until delivery (Art. 1164). For generic things, the obligor may deliver any item of the same kind and quality. Obligations to do or not to do require performance or forbearance, with substitution by damages in case of breach.

Breach occurs through delay (mora), fraud (dolo), negligence (culpa), or contravention of the tenor of the obligation. The debtor is liable for damages, including foreseeable and unforeseeable losses in cases of fraud or gross negligence (Art. 1170). Fortuitous events (caso fortuito) excuse non-performance if they are unforeseeable or, though foreseen, inevitable, without the debtor’s fault (Art. 1174). Remedies for the creditor include specific performance, rescission, or damages.

Different Kinds of Obligations (Articles 1179–1230)

Obligations are classified according to their characteristics:

Pure and Conditional Obligations (Arts. 1179–1192). A pure obligation is demandable at once. Conditional obligations depend on a future and uncertain event. Suspensive conditions suspend the obligation until the event occurs; resolutory conditions extinguish it upon happening. Conditions are potestative (dependent on one party’s will), casual (dependent on chance), or mixed. Potestative conditions imposed solely on the debtor render the obligation void.
Obligations with a Period (Arts. 1193–1198). A period fixes the time for performance. Obligations with a suspensive period are not demandable until the period arrives; resolutory periods extinguish the obligation upon arrival. Courts may fix periods in certain cases (Art. 1197).
Alternative and Facultative Obligations (Arts. 1199–1206). In alternative obligations, the debtor chooses among several prestations unless otherwise stipulated; loss of all but one leaves only the remaining prestation. Facultative obligations allow the debtor to substitute one prestation for another.
Joint and Solidary Obligations (Arts. 1207–1222). Joint obligations presume each debtor is liable only for a proportionate share (Art. 1208). Solidary obligations make each debtor liable for the entire obligation, with right of reimbursement. Solidarity arises from law, stipulation, or the nature of the obligation.
Divisible and Indivisible Obligations (Arts. 1223–1225). Divisible obligations permit partial performance; indivisible ones require full compliance.
Obligations with a Penal Clause (Arts. 1226–1230). A penal clause substitutes indemnity for damages and substitutes the penalty for performance unless otherwise stipulated. The penalty is enforceable only upon breach.

Extinguishment of Obligations (Articles 1231–1304)

Obligations are extinguished by: (1) payment or performance; (2) loss of the thing due; (3) condonation or remission; (4) confusion or merger; (5) compensation; (6) novation; and (7) other causes such as annulment, rescission, fulfillment of a resolutory condition, or prescription (Art. 1231).

Payment (Arts. 1232–1251) requires complete delivery to the proper person, of the thing due, at the proper time and place, and in the proper manner. Partial payment is not accepted unless stipulated or the debt is partially liquidated. Payment by a third person is valid if with the debtor’s consent or without it but with benefit to the debtor.
Loss of the Thing Due (Arts. 1262–1269) extinguishes the obligation if the specific thing perishes without fault and before delay. For generic things, loss does not extinguish unless the genus is limited.
Condonation or Remission (Arts. 1270–1274) is the gratuitous abandonment of the obligation, requiring acceptance and formalities akin to donations.
Confusion or Merger (Arts. 1275–1277) occurs when the qualities of creditor and debtor merge in one person.
Compensation (Arts. 1278–1290) extinguishes reciprocal debts of the same kind, amount, and due date by operation of law (legal compensation) or agreement.
Novation (Arts. 1291–1304) substitutes a new obligation for the old, extinguishing the latter. It may be objective (change of prestation), subjective (change of parties), or mixed, and requires capacity, consent, and validity of the new obligation.

Prescription bars enforcement after the lapse of the applicable period (ordinary or extraordinary).

Title II: Contracts

General Provisions (Articles 1305–1317)

A contract is a meeting of minds between two persons whereby one binds himself, with respect to the other, to give something or to render some service (Art. 1305). Contracts are the law between the parties, obligatory, and must be complied with in good faith (Art. 1315). They are characterized by: (1) autonomy (freedom to contract); (2) mutuality (binding on both parties); (3) obligatoriness; (4) relativity (affects only the parties and their heirs/successors, subject to exceptions); and (5) consensuality (perfected by mere consent).

Contracts are perfected by mere consent, except real contracts requiring delivery and formal contracts requiring solemnities (Art. 1315). The principle of freedom of contract is subject to limitations: contracts must not be contrary to law, morals, good customs, public order, or public policy (Art. 1306).

Essential Requisites of Contracts (Articles 1318–1355)

There are three essential requisites: (1) consent of the contracting parties; (2) object certain which is the subject matter of the contract; and (3) cause of the obligation which is established (Art. 1318).

Consent (Arts. 1319–1346) is manifested by the meeting of offer and acceptance. Offer must be definite; acceptance must be absolute. Vices of consent include mistake, violence, intimidation, undue influence, and fraud, rendering contracts voidable. Capacity is required; minors, insane persons, and others under legal disability lack capacity.
Object (Arts. 1347–1349) must be within the commerce of men, possible, determinate or determinable, and licit.
Cause (Arts. 1350–1355) is the prestation or promise of a thing or service constituting the consideration. It must be licit and exist at the time of contracting. Lesion or inadequacy of cause does not invalidate unless there is fraud or lesion in rescissible contracts.

Form of Contracts (Articles 1356–1358)

Contracts are generally consensual and valid regardless of form, but certain contracts require a specific form for validity (e.g., donations of immovable property must be in public instrument) or for enforceability (Statute of Frauds under Art. 1403). Contracts may be oral or written.

Interpretation of Contracts (Articles 1370–1379)

The literal meaning of stipulations governs when clear. Otherwise, the intention of the parties prevails. Ambiguities are resolved against the party who caused them. Contracts are interpreted as a whole, according to usage, principles of equity, and good faith.

Defective Contracts

Contracts may be defective and subject to remedies:

Rescissible Contracts (Arts. 1380–1389) are valid but may be rescinded due to lesion (economic prejudice), fraud upon creditors, or contracts entered by guardians or representatives causing lesion. Rescission requires mutual restitution.
Voidable Contracts (Arts. 1390–1402) are valid until annulled due to incapacity or vices of consent. Annulment extinguishes obligations but restores parties to original positions.
Unenforceable Contracts (Arts. 1403–1408) cannot be enforced by action unless ratified. These include contracts entered without authority, contracts infringing the Statute of Frauds, and contracts where both parties are incapable.
Void or Inexistent Contracts (Arts. 1409–1422) produce no legal effect. Causes include lack of essential elements, illegal or immoral object or cause, simulation, and absolute lack of consent. No ratification or prescription validates them.

Quasi-Contracts and Natural Obligations

Quasi-contracts create obligations to prevent unjust enrichment (e.g., negotiorum gestio—voluntary management of another’s affairs—and solutio indebiti—payment of what is not due). Natural obligations, though not enforceable by court action, produce legal effects upon voluntary performance (Title III, Arts. 1423–1430).

The provisions on obligations and contracts form the bedrock of Philippine civil law, ensuring stability in commercial and personal relations while balancing individual autonomy with societal interests. Philippine jurisprudence has consistently interpreted these articles to promote equity, good faith, and the protection of the vulnerable, adapting the Code to contemporary needs without departing from its core principles of justice and fairness.