Introduction

Obligations are among the most fundamental concepts in Philippine civil law. They govern everyday legal relationships: payment of debts, performance of contracts, liability for damages, return of property, delivery of goods, compensation for injury, and restitution of benefits received without legal basis.

Under Philippine law, an obligation is a juridical necessity to give, to do, or not to do. This means that a person bound by an obligation may be legally compelled to perform it. The person who has the right to demand performance is the creditor or obligee, while the person who must perform is the debtor or obligor.

The Civil Code of the Philippines identifies five sources of obligations:

Law;
Contracts;
Quasi-contracts;
Acts or omissions punished by law; and
Quasi-delicts.

These sources are expressly recognized in Article 1157 of the Civil Code. Understanding them is essential because the source of an obligation determines its nature, requisites, enforceability, defenses, remedies, damages, and prescription period.

I. Concept of Obligation

A. Definition

Article 1156 of the Civil Code defines an obligation as a juridical necessity to give, to do, or not to do.

This definition contains several important ideas.

First, an obligation is juridical. It is not merely moral, social, or religious. It is recognized by law.

Second, it is a necessity. The obligor is not merely expected to perform; the obligor may be legally compelled to perform.

Third, the object of the obligation may be:

To give, such as delivering a car, paying money, or transferring ownership;
To do, such as rendering services, constructing a building, or repairing property;
Not to do, such as refraining from competing, not building beyond a height limit, or not disclosing confidential information.

B. Essential Elements of an Obligation

A civil obligation generally has four essential elements:

Element	Meaning
Active subject	The creditor or obligee who may demand performance
Passive subject	The debtor or obligor who must perform
Prestation	The conduct required: to give, to do, or not to do
Juridical tie	The legal bond that connects the parties

Without a juridical tie, there is no civil obligation. A person may feel morally bound to help another, but unless the law recognizes a legal duty, the obligation may not be enforceable in court.

II. Article 1157: The Five Sources of Obligations

Article 1157 of the Civil Code provides that obligations arise from:

Law;
Contracts;
Quasi-contracts;
Acts or omissions punished by law; and
Quasi-delicts.

This enumeration is exclusive in the sense that a civil obligation must be traceable to one of these recognized sources. However, a single factual situation may sometimes involve more than one source. For example, a vehicular collision may give rise to civil liability based on quasi-delict, criminal liability if a crime was committed, and contractual liability if the vehicle was operated by a carrier under a contract of carriage.

III. First Source: Law

A. Meaning of Obligations Arising From Law

Obligations arising from law are those imposed directly by legal provisions. The obligation exists because the law itself commands it, not because the parties agreed to it, not because one person committed a crime, and not because one person caused damage through negligence.

Article 1158 states that obligations derived from law are not presumed. Only those expressly determined in the Civil Code or in special laws are demandable.

This means a person cannot simply claim that another has a legal obligation unless a law clearly imposes it.

B. Characteristics

Obligations arising from law have the following characteristics:

They are created by statute or legal rule.
They are not presumed.
They are enforceable only when the law clearly provides for them.
Their extent and consequences are governed by the law that creates them.
They do not depend on the will or agreement of the parties.

C. Examples

1. Obligation to Pay Taxes

Tax obligations arise from law. A taxpayer is required to pay taxes not because of a contract with the government, but because tax laws impose that duty.

2. Obligation to Support Certain Relatives

Under family law, certain persons are obliged to support each other, such as spouses, legitimate ascendants and descendants, parents and their children, and other persons specified by law. This obligation does not arise from contract. It arises from law and family relations.

3. Obligation of Employers Under Labor Laws

Employers have statutory obligations to pay minimum wage, overtime pay, holiday pay, service incentive leave pay, and other labor standards benefits. These duties may exist even if the employment contract is silent.

4. Obligation to Register Civil Status Events

The duty to register births, marriages, and deaths arises from civil registration laws.

5. Obligations of Co-owners

Certain obligations among co-owners, such as sharing expenses necessary for preservation of the common property, arise from law.

6. Obligations of Possessors

A possessor may have obligations regarding fruits, expenses, or return of property depending on whether possession is in good faith or bad faith.

D. Legal Effect

Where an obligation arises from law, the terms of the obligation are determined by the applicable legal provision. The parties generally cannot disregard mandatory legal obligations by private agreement.

For example, an employment contract cannot validly waive minimum wage rights if such waiver violates labor standards law. Similarly, a parent cannot avoid legally required child support merely by saying there was no contract to provide support.

E. Important Rule: Obligations From Law Are Not Presumed

This rule protects individuals from being burdened with supposed obligations that have no legal basis. A court will not impose a legal obligation merely because it appears fair, charitable, or socially expected. There must be a law creating the obligation.

IV. Second Source: Contracts

A. Meaning of Contractual Obligations

A contract is a meeting of minds between two persons whereby one binds himself or herself, with respect to the other, to give something or to render some service.

Obligations arising from contracts are among the most common forms of civil obligations. They are created by agreement. The parties themselves establish the juridical tie.

Article 1159 of the Civil Code provides that obligations arising from contracts have the force of law between the contracting parties and should be complied with in good faith.

This is the doctrine of mutuality and obligatory force of contracts.

B. Requisites of a Contract

A valid contract generally requires:

Consent of the contracting parties;
Object certain which is the subject matter of the contract; and
Cause of the obligation established.

Without these essential requisites, there may be no valid contract.

C. Principle of Autonomy of Contracts

Parties may generally establish such stipulations, clauses, terms, and conditions as they may deem convenient, provided they are not contrary to:

Law;
Morals;
Good customs;
Public order; or
Public policy.

This principle allows private persons to arrange their affairs according to their own interests. However, contractual freedom is not absolute.

D. Characteristics of Contractual Obligations

Contractual obligations are:

Voluntary, because they arise from the parties’ agreement;
Binding, because contracts have the force of law between the parties;
Relative, because contracts generally bind only the parties, their assigns, and heirs, except in cases where rights and obligations are not transmissible;
Subject to good faith, because parties must observe honesty, fairness, and fidelity to the agreed terms;
Governed by both the contract and the law, because legal provisions may supplement or override contractual terms.

E. Examples

1. Sale

In a contract of sale, the seller is obliged to deliver the thing sold, while the buyer is obliged to pay the price.

2. Lease

In a lease, the lessor is obliged to allow use or enjoyment of the property, while the lessee is obliged to pay rent and comply with lease terms.

3. Loan

In a loan, the borrower may be obliged to return the same amount of money or the equivalent thing borrowed, depending on the kind of loan.

4. Employment Contract

An employee agrees to render services, while the employer agrees to pay compensation, subject also to labor laws.

5. Construction Contract

A contractor may be obliged to build, repair, or renovate according to agreed plans, specifications, deadlines, and standards.

6. Service Agreement

A professional or service provider may be obliged to perform a specific service, while the client is obliged to pay the agreed fee.

F. Good Faith in Contracts

Good faith means that parties must comply not only with the literal terms of the contract, but also with its spirit and purpose. A party may violate good faith even when acting under a technical interpretation of a clause if the conduct defeats the reasonable expectations created by the agreement.

Examples of bad faith may include:

Refusing performance without justification;
Deliberately delaying payment;
Concealing material facts;
Abusing a contractual right;
Using a clause for an unfair or dishonest purpose;
Preventing the other party from performing.

G. Breach of Contract

A breach occurs when a party fails to perform a contractual obligation. Breach may consist of:

Non-performance;
Delayed performance;
Defective performance;
Partial performance;
Violation of a negative covenant, or doing what one promised not to do.

Remedies may include:

Specific performance;
Rescission or resolution;
Damages;
Interest;
Attorney’s fees, when legally proper;
Delivery or return of property;
Injunction, in appropriate cases.

H. Contract as Law Between the Parties

The statement that a contract has the force of law between the parties does not mean that private parties can create law for the public. It means that, as between them, valid contractual stipulations must be obeyed as if they were legal commands.

However, courts will not enforce contractual terms that violate law, morals, public order, public policy, or good customs.

V. Third Source: Quasi-Contracts

A. Meaning of Quasi-Contract

A quasi-contract is a juridical relation arising from lawful, voluntary, and unilateral acts, where one person becomes obligated to another to avoid unjust enrichment.

Unlike contracts, quasi-contracts do not arise from an agreement. There is no meeting of minds. The law creates the obligation because equity and justice require it.

Article 1160 provides that obligations derived from quasi-contracts are subject to the provisions of the Civil Code on quasi-contracts.

B. Purpose

The main purpose of quasi-contract is to prevent unjust enrichment. A person should not be allowed to benefit at another’s expense without legal or equitable basis.

C. Characteristics

Quasi-contracts are:

Lawful, because they do not arise from illegal acts;
Voluntary, because the act is done willingly;
Unilateral, because they arise from the act of one party, not from an agreement;
Non-contractual, because there is no consent between the parties as in a contract;
Equitable, because the law imposes the obligation to prevent unjust enrichment.

D. Principal Kinds of Quasi-Contracts

The two classic quasi-contracts under the Civil Code are:

Negotiorum gestio; and
Solutio indebiti.

Other situations may also be treated as quasi-contractual where the law imposes restitution to prevent unjust enrichment.

E. Negotiorum Gestio

1. Meaning

Negotiorum gestio occurs when a person voluntarily takes charge of another’s abandoned or neglected business or property without authority from the owner.

The person who manages the business or property is often called the officious manager or gestor. The owner is the person whose affairs are managed.

2. Requisites

The usual requisites are:

A person voluntarily manages the property or affairs of another;
The property or business is abandoned or neglected;
The manager has no authority from the owner;
The act is lawful;
The management is intended for the benefit of the owner.

3. Example

A neighbor sees that a homeowner is abroad and that the homeowner’s roof has been badly damaged by a typhoon. To prevent further damage, the neighbor hires workers for emergency repairs. Even without prior authority, the homeowner may be obliged to reimburse necessary and useful expenses if the legal requisites are met.

4. Duties of the Manager

The gestor must generally:

Act with diligence;
Continue management until the owner can take over;
Render an accounting;
Turn over property or benefits received;
Avoid acting against the presumed will or interest of the owner.

5. Duties of the Owner

The owner may be required to:

Reimburse necessary and useful expenses;
Assume obligations properly contracted by the gestor for the owner’s benefit;
Indemnify the gestor for damages suffered in proper management.

F. Solutio Indebiti

1. Meaning

Solutio indebiti occurs when a person receives something by mistake, and there was no right to demand it. The recipient has the obligation to return it.

It is based on the principle that no one should enrich himself unjustly at the expense of another.

2. Requisites

The usual requisites are:

A payment or delivery was made;
There was no obligation to make the payment or delivery;
The payment or delivery was made by mistake.

3. Example

A person accidentally transfers money to the wrong bank account. The recipient, having no right to the money, must return it.

Another example: A debtor pays a debt that has already been fully paid, believing by mistake that it remains outstanding. The creditor who receives the second payment must return it.

4. Mistake Is Important

Solutio indebiti generally requires mistake. If a person knowingly pays what is not due, other legal rules may apply, such as donation, waiver, or natural obligation, depending on the circumstances.

5. Obligation of the Recipient

The recipient must return what was unduly received. If the recipient acted in bad faith, liability may include fruits, interest, damages, or other consequences provided by law.

G. Other Examples of Quasi-Contractual Obligations

Other examples may include:

Reimbursement for necessary expenses made to preserve another’s property;
Return of benefits received without legal basis;
Restitution where a contract is void but one party has received benefits;
Recovery of mistaken overpayment;
Return of property delivered under erroneous belief of obligation.

H. Difference Between Contract and Quasi-Contract

Contract	Quasi-contract
Based on agreement	Based on law and equity
Requires consent	Does not require meeting of minds
Parties create the obligation	Law creates the obligation
Terms are mainly determined by parties	Consequences are determined by law
Example: sale, lease, loan	Example: solutio indebiti, negotiorum gestio

VI. Fourth Source: Acts or Omissions Punished by Law

A. Meaning

Obligations may arise from crimes or acts and omissions punished by law. When a person commits a criminal offense, civil liability may also arise from the same act.

Article 1161 provides that civil obligations arising from criminal offenses are governed by penal laws, subject to the provisions of the Civil Code and other applicable laws.

In Philippine law, a crime may produce both:

Criminal liability, which is the offender’s liability to the State; and
Civil liability, which is the offender’s liability to the injured party.

B. Basis

The civil liability arising from crime is based on the principle that a person who commits a punishable act causing injury or loss must repair the damage.

The criminal case vindicates public justice. The civil liability compensates the private offended party.

C. Scope of Civil Liability From Crime

Civil liability arising from crime may include:

Restitution;
Reparation of damage caused;
Indemnification for consequential damages.

1. Restitution

Restitution means returning the thing itself whenever possible. For example, if stolen property is recovered, it must be returned to the owner.

2. Reparation

Reparation refers to payment for the value of the damage caused. If the property cannot be returned or was damaged, the offender may be required to pay its value.

3. Indemnification

Indemnification covers damages suffered by the injured party, including consequential damages, subject to legal standards of proof and causation.

D. Examples

1. Theft

A person who steals property may be criminally liable for theft and civilly liable to return the property or pay its value.

2. Estafa

A person who defrauds another may be criminally liable for estafa and civilly liable to return the money or property fraudulently obtained.

3. Reckless Imprudence Resulting in Homicide or Damage to Property

A driver who causes death, physical injuries, or property damage through reckless imprudence may incur criminal liability and civil liability.

4. Physical Injuries

A person who unlawfully injures another may be liable for medical expenses, lost income, moral damages, and other damages, depending on the facts.

5. Malicious Mischief

A person who intentionally damages another’s property may be required to pay the cost of repair or replacement, in addition to criminal liability.

E. Civil Action Deemed Instituted With Criminal Action

As a general procedural principle, the civil action for recovery of civil liability arising from the offense is deemed instituted with the criminal action, unless the offended party waives it, reserves the right to institute it separately, or institutes it before the criminal action.

This means that when a criminal case is filed, the court may also determine the civil liability arising from the crime, subject to procedural rules.

F. Effect of Acquittal

An acquittal in the criminal case does not always eliminate civil liability. The effect depends on the reason for acquittal.

If the accused is acquitted because the act or omission did not exist, civil liability based on the crime may not prosper. But if acquittal is based on reasonable doubt, civil liability may still be awarded if the evidence shows liability by preponderance of evidence, depending on the circumstances and applicable rules.

G. Independent Civil Actions

Philippine law recognizes certain civil actions that may proceed independently of criminal prosecution, such as actions based on quasi-delict or specific Civil Code provisions involving defamation, fraud, physical injuries, and violations of constitutional rights, subject to applicable rules.

This is important because the same act may give rise to civil liability apart from criminal liability.

VII. Fifth Source: Quasi-Delicts

A. Meaning of Quasi-Delict

A quasi-delict, also called culpa aquiliana or tort, occurs when a person, by act or omission, causes damage to another through fault or negligence, where there is no pre-existing contractual relation between the parties regarding the act or omission.

Article 2176 of the Civil Code provides the basic rule: whoever by act or omission causes damage to another, there being fault or negligence, is obliged to pay for the damage done.

B. Requisites

The usual requisites of quasi-delict are:

An act or omission;
Fault or negligence;
Damage suffered by another;
Causal connection between the fault or negligence and the damage;
No pre-existing contractual relation between the parties concerning the act complained of.

C. Negligence

Negligence is the failure to observe the care required by the circumstances. It is conduct that falls below the standard expected of a reasonably prudent person.

The degree of care required depends on the nature of the activity, danger involved, relationship of the parties, and surrounding circumstances.

D. Examples

1. Vehicular Accident

A driver who negligently causes a collision may be liable for property damage, medical expenses, lost income, and other damages.

2. Falling Objects

A building owner or occupant may be liable if objects fall due to negligent maintenance and injure a pedestrian.

3. Medical Negligence

A health professional may be civilly liable if damage results from negligent medical treatment, subject to proof of professional duty, breach, causation, and damages.

4. Negligent Supervision

Parents, guardians, teachers, employers, and owners or managers of establishments may be liable in certain circumstances for damage caused by persons under their authority or supervision.

5. Unsafe Premises

A business establishment that fails to maintain reasonably safe premises may be liable for injuries caused by unsafe conditions.

E. Vicarious Liability

Quasi-delict includes situations where a person may be liable not only for one’s own acts, but also for the acts of persons for whom one is responsible.

Examples include:

Parents for minor children living with them;
Guardians for minors or incapacitated persons under their authority;
Employers for employees acting within assigned tasks;
Teachers or heads of establishments for students or apprentices under their supervision, in legally recognized situations.

The responsible person may avoid liability by proving that they observed all the diligence of a good father of a family to prevent damage, where such defense is legally available.

F. Employer Liability

Employers may be liable for damage caused by employees acting within the scope of assigned duties. This liability is based on the employer’s own presumed negligence in selection or supervision.

The employer may defend by showing diligence in:

Hiring;
Training;
Supervision;
Enforcement of rules;
Monitoring;
Discipline;
Prevention of foreseeable harm.

G. Quasi-Delict Versus Crime

Quasi-delict	Crime
Source is negligence or fault under civil law	Source is an act or omission punished by penal law
Purpose is compensation	Purpose includes punishment and public justice
Proof is generally preponderance of evidence in civil cases	Proof beyond reasonable doubt in criminal cases
Liability is civil	Liability may be criminal and civil
Action may be independent in appropriate cases	Prosecuted in the name of the People

A single negligent act may sometimes be both a crime and a quasi-delict. For example, a reckless driving incident may lead to a criminal charge and also support a civil action based on quasi-delict.

H. Quasi-Delict Versus Breach of Contract

Quasi-delict	Breach of contract
No pre-existing contract concerning the act	There is a contract between the parties
Duty arises from law	Duty arises from agreement
Fault or negligence must be shown	Breach of contractual duty is central
Example: negligent driver hits pedestrian	Bus company fails to safely transport passenger

However, the distinction can become complex. The same facts may involve both contractual and quasi-delict principles, especially in transportation, professional services, and commercial dealings.

VIII. Comparison of the Five Sources

Source	Basis	Example	Primary Legal Idea
Law	Statute or legal provision	Tax, support, labor standards	Legal duty imposed directly by law
Contract	Agreement	Sale, lease, loan	Parties bind themselves
Quasi-contract	Lawful voluntary unilateral act	Mistaken payment	Prevent unjust enrichment
Crime	Penal offense	Theft, estafa, physical injuries	Repair damage caused by punishable act
Quasi-delict	Fault or negligence	Vehicular negligence	Compensate damage caused by negligence

IX. Why the Source of Obligation Matters

Identifying the source of an obligation is not merely academic. It affects major legal consequences.

A. Applicable Law

Different Civil Code provisions apply depending on the source. Contractual obligations are governed by the law on contracts. Quasi-contracts are governed by provisions on unjust enrichment and restitution. Criminal civil liability is governed by penal laws and related civil law provisions. Quasi-delicts are governed by tort principles.

B. Elements to Prove

Each source has different elements.

For contract, one must prove the contract and its breach.

For quasi-delict, one must prove fault or negligence, damage, and causation.

For solutio indebiti, one must prove mistaken payment of something not due.

For obligations from law, one must point to a specific legal provision.

For civil liability from crime, one must establish that the offense caused civil damage.

C. Defenses

Defenses differ depending on the source.

In contract, defenses may include invalidity, payment, prescription, waiver, novation, force majeure, or substantial performance.

In quasi-delict, defenses may include absence of negligence, contributory negligence, fortuitous event, lack of causation, or due diligence in supervision.

In quasi-contract, defenses may include absence of mistake, valid legal basis for receipt, or voluntary payment with knowledge.

In obligations from law, defenses depend on the statute.

In civil liability from crime, defenses may include absence of the act, lack of causation, payment, restitution, or other defenses recognized by penal and civil law.

D. Prescription

The period for filing an action may vary. Written contracts, oral contracts, quasi-delicts, injury to rights, and actions based on law may have different prescriptive periods. Failure to file within the proper period may bar the action.

E. Damages

The kind and amount of damages recoverable may differ depending on whether the action is based on contract, quasi-delict, crime, or another source. Moral damages, exemplary damages, actual damages, temperate damages, nominal damages, and attorney’s fees have specific legal requirements.

F. Burden of Proof

The claimant must prove the facts necessary for the specific source of obligation invoked. A party cannot simply allege damage and demand compensation without establishing the legal basis of the obligation.

X. Detailed Discussion of Civil Liability and Damages

A. Actual or Compensatory Damages

Actual damages compensate for proven pecuniary loss. They may include:

Medical expenses;
Repair costs;
Lost income;
Value of property lost;
Funeral expenses;
Cost of replacement;
Other expenses proven with reasonable certainty.

B. Moral Damages

Moral damages compensate for mental anguish, serious anxiety, wounded feelings, social humiliation, and similar injury. They are not awarded in every case. The claimant must show legal basis and factual support.

Moral damages may be available in certain cases involving crimes, quasi-delicts causing physical injury, bad faith in contracts, and other situations recognized by law.

C. Exemplary Damages

Exemplary damages are imposed by way of example or correction for the public good. They may be awarded in addition to other damages when the defendant’s conduct is wanton, fraudulent, reckless, oppressive, or malevolent, depending on the source of liability and applicable rules.

D. Nominal Damages

Nominal damages may be awarded when a legal right is violated but no substantial loss is proven. They vindicate or recognize the right.

E. Temperate or Moderate Damages

Temperate damages may be awarded when some pecuniary loss has been suffered but the exact amount cannot be proven with certainty.

F. Attorney’s Fees

Attorney’s fees are not automatically awarded. They may be granted only in cases recognized by law, such as when the defendant’s act compelled the plaintiff to litigate with third persons or incur expenses to protect an interest, or where other legal grounds exist.

XI. Natural Obligations Distinguished

Natural obligations should not be confused with the five sources of civil obligations.

A natural obligation is based on equity and natural law. It does not grant a court action to compel performance, but once voluntarily performed by a person with capacity, the performance may be retained and cannot be recovered.

Example: A debtor pays a debt that has already prescribed. The creditor may not have been able to compel payment in court because of prescription, but if the debtor voluntarily pays, the debtor generally cannot recover the payment merely because the debt was no longer enforceable.

Natural obligations are different from civil obligations because civil obligations are enforceable by court action.

XII. Civil Obligation Versus Moral Obligation

Not every moral duty is a civil obligation.

A person may have a moral obligation to help a friend, forgive a relative, support a charitable cause, or keep a social promise. But unless the duty is recognized by law as legally enforceable, it is not a civil obligation.

For example, a promise to give a gift may not be enforceable unless the legal requisites for donation or contract are present. A moral duty may influence conduct, but it does not always create legal liability.

XIII. Interplay Among Sources

Some real-life situations may involve overlapping sources of obligations.

A. Vehicular Collision

A negligent driver who injures another may face:

Civil liability based on quasi-delict;
Civil liability arising from crime if reckless imprudence is prosecuted;
Contractual liability if the injured person was a passenger under a contract of carriage.

B. Employer-Employee Incident

An employee’s negligent act may give rise to:

Quasi-delict liability of the employee;
Vicarious liability of the employer;
Labor law obligations if the injured person is an employee;
Criminal liability if the act is punishable.

C. Mistaken Payment Under a Contract

A mistaken overpayment may involve:

Contractual obligations between the parties;
Quasi-contractual restitution under solutio indebiti;
Possible damages if bad faith is involved.

D. Fraudulent Transaction

Fraud may create:

Criminal liability for estafa or related offenses;
Civil liability arising from crime;
Contractual remedies such as annulment or damages;
Restitution based on unjust enrichment.

XIV. Obligations Arising From Law in Greater Detail

Because obligations from law are not presumed, courts require a clear legal basis.

A. Express Legal Basis

The claimant must identify the statute, Civil Code provision, special law, regulation, or legal rule creating the obligation.

B. Mandatory Nature

Many legal obligations are mandatory and cannot be waived if the waiver is contrary to law or public policy.

C. Supplementary Application of Civil Code

Even where an obligation arises from special law, the Civil Code may apply suppletorily if not inconsistent with the special law.

D. Public Law and Private Law Obligations

Some obligations from law are owed to the State, such as taxes and regulatory duties. Others are owed to private persons, such as support, reimbursement, or statutory benefits.

XV. Contractual Obligations in Greater Detail

A. Stages of Contract

A contract may involve several stages:

Preparation or negotiation;
Perfection, when parties agree on essential elements;
Consummation, when the parties perform their obligations.

Legal consequences may arise at each stage.

B. Perfection of Contracts

Contracts are generally perfected by mere consent, except in cases where the law requires delivery, formality, or special form.

Examples:

A sale is generally perfected by agreement on object and price;
A real contract, such as commodatum or deposit, requires delivery;
Certain contracts must appear in writing or in a public document for enforceability, validity, or convenience.

C. Obligatory Force

Once validly perfected, a contract binds the parties. A party cannot unilaterally withdraw simply because performance has become inconvenient, unless the law or contract allows it.

D. Mutuality

The validity and compliance of a contract cannot be left solely to the will of one party. A contract must bind both sides according to agreed terms and legal rules.

E. Relativity

Contracts generally take effect only between the parties, their assigns, and heirs. Third persons are generally not bound, except in legally recognized cases such as stipulations pour autrui, real rights, or obligations attached to property.

F. Reformation and Interpretation

If a written contract does not express the true intention of the parties due to mistake, fraud, inequitable conduct, or accident, reformation may be available in appropriate cases.

If terms are ambiguous, rules on interpretation apply, including consideration of the parties’ intent, contemporaneous and subsequent acts, usage, and the contract as a whole.

XVI. Quasi-Contracts in Greater Detail

A. Unjust Enrichment

The broad principle behind quasi-contracts is that no one shall unjustly enrich himself at the expense of another.

Unjust enrichment generally requires:

A person is benefited;
The benefit is at another’s expense;
There is no legal ground for the benefit;
Equity requires restitution.

B. Quasi-Contract Is Not Implied Contract

A quasi-contract is sometimes described loosely as an implied contract, but technically it is not a contract. It does not depend on actual or presumed consent. The law imposes the obligation.

C. Importance in Commercial Transactions

Quasi-contractual principles are often invoked in:

Mistaken payments;
Erroneous bank transfers;
Overpayments;
Double payments;
Payments under void transactions;
Reimbursement claims;
Emergency preservation of property;
Benefits received without valid cause.

D. Good Faith and Bad Faith

The recipient’s good faith or bad faith may affect liability. A person who receives something by mistake and promptly returns it may have limited liability. A person who knowingly keeps what is not due may be liable for additional consequences.

XVII. Civil Liability From Crimes in Greater Detail

A. Every Person Criminally Liable May Also Be Civilly Liable

As a general rule, criminal liability carries civil liability when the crime causes damage to another. However, there are crimes that may not result in private civil damages, depending on the nature of the offense.

B. The Offended Party

The offended party is the person directly injured by the offense. In crimes involving death, heirs or legally recognized beneficiaries may pursue civil liability.

C. Reservation of Civil Action

The offended party may sometimes reserve the right to file a separate civil action. The rules on reservation are procedural and should be carefully observed.

D. Prejudicial Questions

A civil issue may sometimes be so closely connected to a criminal case that it must first be resolved before the criminal case may proceed. This is known as a prejudicial question. It applies only under specific legal conditions.

E. Independent Civil Liability

Civil liability may exist independently of criminal liability in certain cases. This reinforces the principle that the failure of a criminal case does not always defeat civil recovery.

XVIII. Quasi-Delicts in Greater Detail

A. Standard of Care

The standard is generally that of a prudent person under similar circumstances. The law asks whether the defendant acted with the care that the situation required.

B. Causation

The claimant must show that the defendant’s fault or negligence caused the damage. Mere negligence without damage does not create liability for compensation. Likewise, damage without causal connection to the defendant’s conduct is insufficient.

C. Proximate Cause

Proximate cause is the cause that, in natural and continuous sequence, produces the injury, and without which the result would not have occurred. It need not be the only cause, but it must be a legally sufficient cause.

D. Contributory Negligence

If the injured person’s own negligence contributed to the damage, recovery may be reduced. Contributory negligence does not always bar recovery, but it may affect the amount of damages.

E. Fortuitous Event

A fortuitous event may exempt a person from liability if the event was unforeseeable or unavoidable and the damage was not due to the defendant’s negligence. However, if negligence contributed to the loss, the defense may fail.

F. Last Clear Chance

In some negligence cases, the doctrine of last clear chance may apply where one party had the final opportunity to avoid the harm but failed to do so. Its application depends on the circumstances.

G. Res Ipsa Loquitur

The doctrine of res ipsa loquitur, meaning “the thing speaks for itself,” may apply where the nature of the accident is such that it would not ordinarily happen without negligence, the instrumentality was under the defendant’s control, and the injured party did not contribute to the harm. It allows an inference of negligence in appropriate cases.

XIX. Key Distinctions Among Sources

A. Law Versus Contract

An obligation from law exists because a legal provision imposes it. A contractual obligation exists because the parties agreed to it.

Example:

Minimum wage obligation arises from law.
A sales commission agreed upon by employer and employee may arise from contract, subject to labor law.

B. Contract Versus Quasi-Contract

Contract requires consent. Quasi-contract does not.

Example:

A agrees to lend B ₱50,000. This is contract.
A mistakenly sends ₱50,000 to B’s account. B must return it under quasi-contract.

C. Crime Versus Quasi-Delict

A crime is an offense against the State punished by penal law. Quasi-delict is a civil wrong based on fault or negligence.

Example:

Reckless imprudence causing injuries may be criminal.
Negligent driving causing damage may also be a quasi-delict.

D. Quasi-Contract Versus Quasi-Delict

Quasi-contract involves lawful acts and unjust enrichment. Quasi-delict involves fault or negligence causing damage.

Example:

Receiving mistaken payment is quasi-contract.
Causing a collision through negligence is quasi-delict.

E. Contract Versus Crime

A breach of contract is not automatically a crime. Failure to pay a debt, by itself, generally gives rise to civil liability, not criminal liability. It may become criminal only if the facts satisfy the elements of a punishable offense, such as fraud.

XX. Remedies for Breach or Violation of Obligations

Depending on the source and facts, remedies may include:

A. Specific Performance

The court may order the debtor to perform the obligation, especially obligations to give a determinate thing or perform an act that can still be legally compelled.

B. Substitute Performance

If the debtor fails to do an obligation, the creditor may sometimes have it performed by another at the debtor’s expense, subject to legal rules.

C. Rescission or Resolution

In reciprocal obligations, one party may seek rescission or resolution if the other substantially fails to comply.

D. Damages

Damages may compensate the injured party for loss caused by non-performance, negligence, crime, or unjust enrichment.

E. Restitution

Restitution restores what was received without legal basis or returns the parties to their prior situation.

F. Injunction

In obligations not to do, a court may prohibit the obligor from continuing the forbidden act.

G. Annulment or Declaration of Nullity

Where the obligation is based on a defective or void contract, the remedy may involve annulment, declaration of nullity, or related relief.

XXI. Performance of Obligations

A. Obligation to Give

An obligation to give may involve a determinate thing or a generic thing.

A determinate thing is specifically identified, such as a particular parcel of land or a specific vehicle with a plate or engine number. A generic thing is identified only by class or kind, such as 100 sacks of rice or ₱50,000.

The debtor may be required to:

Preserve the thing with proper diligence;
Deliver the thing;
Deliver accessions and accessories;
Pay damages in case of breach.

B. Obligation to Do

An obligation to do requires performance of an act or service.

If the obligor fails to do it, performs it poorly, or acts contrary to the tenor of the obligation, remedies may include having the act done at the obligor’s expense, undoing defective work, or claiming damages.

C. Obligation Not to Do

An obligation not to do requires abstention. If the obligor does what was forbidden, the act may be undone at the obligor’s expense if possible, and damages may be claimed.

XXII. Breach of Obligations

Breach may occur through:

Delay;
Fraud;
Negligence;
Contravention of the tenor of the obligation.

A. Delay

Delay, or mora, occurs when the obligor fails to perform on time and legal demand is made, unless demand is unnecessary under the law or contract.

There are different forms of delay:

Delay by the debtor;
Delay by the creditor;
Compensatio morae, or delay in reciprocal obligations.

B. Fraud

Fraud in performance means deliberate and intentional evasion of the normal fulfillment of an obligation. Waiver of future fraud is generally void.

C. Negligence

Negligence is failure to observe the required diligence. Liability depends on the nature of the obligation and the circumstances.

D. Contravention of Terms

This occurs when a party violates the terms or tenor of the obligation in any manner.

XXIII. Fortuitous Events

A fortuitous event may excuse non-performance when the event is independent of the debtor’s will, unforeseeable or unavoidable, makes performance impossible, and the debtor is free from participation or aggravation of the loss.

However, liability may still exist if:

The law provides liability;
The contract provides liability;
The nature of the obligation requires assumption of risk;
The debtor is in delay;
The debtor contributed to the loss;
The event was foreseeable or avoidable with due diligence.

XXIV. Prescription of Actions

The source of obligation affects the period within which an action must be filed. Actions based on written contracts, oral contracts, injury to rights, quasi-delicts, obligations created by law, judgments, and other sources may have different prescriptive periods.

Prescription is important because even a valid claim may become unenforceable if not filed on time. Parties should identify the source of obligation early to determine the applicable period.

XXV. Practical Examples

Example 1: Support

A parent’s duty to support a minor child arises from law. The child does not need to prove a contract.

Example 2: Sale of Land

The seller’s duty to deliver the land and the buyer’s duty to pay the price arise from contract.

Example 3: Wrong Bank Transfer

A person who receives money mistakenly transferred to his account must return it under quasi-contract, specifically solutio indebiti.

Example 4: Theft of Jewelry

The thief may be criminally liable and civilly liable to return the jewelry or pay its value.

Example 5: Negligent Driving

A driver who negligently hits a pedestrian may be liable under quasi-delict, and possibly also under criminal law if the conduct constitutes reckless imprudence.

XXVI. Common Misconceptions

1. “All obligations come from contracts.”

False. Obligations may arise from law, quasi-contracts, crimes, and quasi-delicts even without agreement.

2. “If there is no written contract, there is no obligation.”

False. Contracts may be oral in many cases, and obligations may also arise from non-contractual sources.

3. “A moral duty is always legally enforceable.”

False. A moral duty is not necessarily a civil obligation.

4. “A crime only results in imprisonment or fine.”

False. A crime may also create civil liability to compensate the injured party.

5. “Negligence always requires a contract.”

False. Negligence may create liability under quasi-delict even without a contract.

6. “Mistaken payment can be kept if there was no agreement to return it.”

False. The law may require return under solutio indebiti.

7. “Acquittal always means no civil liability.”

False. Depending on the basis of acquittal, civil liability may still be possible.

XXVII. Importance in Litigation and Legal Practice

A lawyer or litigant must identify the correct source of obligation because it affects:

The cause of action;
The allegations in the complaint;
The required evidence;
The defendant’s possible defenses;
The available damages;
The prescription period;
The court’s analysis;
Whether criminal, civil, or administrative remedies are available;
Whether separate or independent actions may proceed.

A complaint that incorrectly identifies the source of obligation may be vulnerable to dismissal or may fail for lack of proof.

XXVIII. Bar Examination and Academic Importance

The five sources of obligations are a foundational topic in Obligations and Contracts. They frequently appear in law school discussions and bar examination questions because they connect many fields of civil law, including contracts, torts, damages, sales, agency, credit transactions, property, family law, and succession.

Typical legal questions include:

Whether an obligation exists;
What source created the obligation;
Whether the obligation is enforceable;
Whether damages may be recovered;
Whether a civil action may proceed independently of a criminal action;
Whether restitution is required;
Whether prescription has set in;
Whether a defendant is liable for another person’s acts.

XXIX. Summary

The five sources of obligations under Philippine civil law are:

Law — obligations directly imposed by legal provisions;
Contracts — obligations arising from agreements with the force of law between the parties;
Quasi-contracts — obligations imposed by law to prevent unjust enrichment, even without agreement;
Acts or omissions punished by law — civil liability arising from crimes;
Quasi-delicts — obligations arising from fault or negligence causing damage, without a pre-existing contractual relation.

Each source has its own elements, legal consequences, defenses, remedies, and prescriptive periods. Correctly identifying the source is essential to enforcing rights and determining liability.

Conclusion

The Civil Code’s five sources of obligations form the backbone of Philippine private law. They explain why one person may legally demand something from another and why another may be compelled to give, do, or refrain from doing something.

Obligations from law arise because the legal system directly commands performance. Contractual obligations arise because parties voluntarily bind themselves. Quasi-contracts arise to prevent unjust enrichment. Civil liability from crimes arises because an offender must repair the damage caused by a punishable act. Quasi-delicts arise because a person who causes damage through fault or negligence must compensate the injured party.

Together, these sources show that civil liability is not limited to contracts. Philippine law recognizes that duties may arise from statute, agreement, equity, crime, and negligence. A clear understanding of these sources allows parties, lawyers, courts, and students to determine when an obligation exists, how it may be enforced, and what remedies are available when it is violated.