I. Introduction

Obligations are at the center of Philippine civil law. Every contract, loan, lease, sale, employment arrangement, service agreement, tort claim, family support claim, and damages case involves an obligation in some form.

Under the Civil Code of the Philippines, an obligation is a juridical necessity to give, to do, or not to do. This means that a person may be legally compelled to perform a prestation, whether that prestation consists of delivering something, rendering service, or refraining from an act.

Understanding the kinds of obligations is important because the legal rules differ depending on the type of obligation involved. The classification affects demandability, breach, damages, remedies, extinguishment, defenses, prescription, and enforcement.

This article discusses the principal kinds of obligations under Philippine civil law, including pure, conditional, obligations with a period, alternative, facultative, joint, solidary, divisible, indivisible, obligations with a penal clause, and obligations classified according to subject matter, source, prestation, sanction, and parties.

II. Definition of Obligation

An obligation is a juridical necessity to give, to do, or not to do.

It is juridical because it is enforceable by law. It is a necessity because the debtor is legally bound to perform, and the creditor may seek legal remedies if the debtor fails to comply.

An obligation has four essential elements:

Active subject, or creditor/obligee — the person entitled to demand performance;
Passive subject, or debtor/obligor — the person bound to perform;
Object or prestation — the conduct required, whether to give, to do, or not to do;
Juridical tie, or vinculum juris — the legal bond that connects the creditor and debtor.

Example:

A borrows ₱100,000 from B and promises to pay on demand. B is the creditor. A is the debtor. The prestation is payment of money. The juridical tie is the loan agreement.

III. Sources of Obligations

Before classifying obligations by kind, it is important to know where obligations come from.

Under Philippine civil law, obligations arise from:

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

These sources are exclusive in the sense that an obligation must be traceable to law, agreement, or a legally recognized act or omission.

IV. Obligations Arising From Law

A. Nature

Obligations arising from law are not presumed. They must be expressly or impliedly established by statute.

Examples include:

Obligation to pay taxes;
Obligation of parents to support children;
Obligation of employers to pay statutory benefits;
Obligation to comply with labor standards;
Obligation of common carriers to observe extraordinary diligence;
Obligation to register certain transactions;
Obligation to indemnify in circumstances provided by law.

B. Legal Effect

When an obligation arises from law, the parties cannot generally waive or modify it if the law is mandatory or founded on public policy.

Example:

An employer cannot validly contract out of minimum wage obligations.

V. Obligations Arising From Contracts

A. Nature

Contractual obligations arise from the agreement of parties. A contract has the force of law between the parties and must be complied with in good faith.

Examples include:

Seller’s obligation to deliver the thing sold;
Buyer’s obligation to pay the price;
Lessee’s obligation to pay rent;
Contractor’s obligation to complete construction;
Borrower’s obligation to repay a loan;
Service provider’s obligation to perform agreed services.

B. Limits

Contractual freedom is not absolute. Stipulations must not be contrary to law, morals, good customs, public order, or public policy.

VI. Obligations Arising From Quasi-Contracts

A. Nature

Quasi-contracts are lawful, voluntary, and unilateral acts that give rise to obligations to prevent unjust enrichment.

The obligation exists even without an actual contract.

B. Main Examples

1. Negotiorum Gestio

This occurs when a person voluntarily manages the property or affairs of another without authority.

Example:

A neighbor repairs another person’s leaking roof during the owner’s absence to prevent further damage. The owner may be obliged to reimburse necessary and useful expenses, depending on the circumstances.

2. Solutio Indebiti

This occurs when something is received when there is no right to demand it, and it was unduly delivered through mistake.

Example:

A bank mistakenly credits ₱50,000 to the wrong account. The recipient has the obligation to return it.

VII. Obligations Arising From Crimes

A. Nature

A person criminally liable for a felony is also civilly liable unless the civil liability is extinguished or reserved under applicable rules.

Examples:

A thief must return stolen property or indemnify the owner;
A person convicted of physical injuries may be liable for medical expenses and damages;
A person convicted of estafa may be ordered to return the amount defrauded;
A person guilty of reckless imprudence may be liable for damages.

B. Civil Liability

Civil liability from crime may include:

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

VIII. Obligations Arising From Quasi-Delicts

A. Nature

A quasi-delict is an act or omission causing damage to another, there being fault or negligence, and no pre-existing contractual relation between the parties regarding the act complained of.

Example:

A driver negligently hits a pedestrian. The driver may be liable for damages even if there is no contract between them.

B. Requisites

The usual requisites are:

Act or omission;
Fault or negligence;
Damage;
Causal connection between fault and damage;
No pre-existing contractual relation concerning the negligent act.

C. Vicarious Liability

Certain persons may be liable for the acts of others, such as parents, employers, teachers, or owners/managers, depending on the facts and applicable law.

IX. Classification According to Subject Matter: To Give, To Do, and Not To Do

The most basic classification of obligations is based on the prestation.

A. Obligation to Give

An obligation to give requires the debtor to deliver a thing.

Examples:

Seller must deliver a car to the buyer;
Borrower must return a specific thing borrowed;
Donor must deliver donated property;
Lessor must deliver possession of leased property;
Debtor must pay money.

B. Specific or Determinate Thing

A thing is determinate when it is particularly designated or physically segregated from all others of the same class.

Example:

“I will deliver my Toyota Vios with plate number ABC 1234.”

In an obligation to give a determinate thing, the debtor must:

Preserve the thing with proper diligence;
Deliver the thing itself;
Deliver accessions and accessories;
Answer for damages in case of fraud, negligence, delay, or contravention of the obligation.

C. Generic or Indeterminate Thing

A thing is generic when it is designated only by class or genus.

Example:

“I will deliver 100 sacks of rice.”

In generic obligations, the debtor cannot generally claim impossibility due to loss of the thing because genus does not perish. If one sack of rice is lost, another sack of rice of the same quality may still be delivered.

D. Obligation to Deliver Accessions and Accessories

The obligation to deliver a determinate thing includes the obligation to deliver its accessions and accessories, even if not mentioned.

Example:

If a person sells a car, the obligation may include accessories such as keys, registration documents, tools, and built-in parts normally included with the car.

E. Obligation to Do

An obligation to do requires the debtor to perform an act or render service.

Examples:

Contractor must build a house;
Artist must paint a portrait;
Lawyer must prepare a pleading;
Employee must perform work;
Repair shop must fix a vehicle;
Doctor must provide medical service.

If the debtor fails to perform, the creditor may have the act done by another at the debtor’s expense, if the act is not purely personal. The creditor may also recover damages.

If the obligation is personal or requires special skill, the debtor cannot be physically compelled to perform because that would amount to involuntary servitude. The remedy is usually damages.

F. Obligation Not to Do

An obligation not to do requires the debtor to abstain from an act.

Examples:

A seller agrees not to compete within a certain area;
A lessee agrees not to sublease;
A party agrees not to disclose confidential information;
A landowner agrees not to build beyond a certain height;
An employee agrees not to use trade secrets;
A debtor agrees not to sell mortgaged property without consent.

If the debtor performs the prohibited act, the act may be undone at the debtor’s expense, if legally and physically possible. Damages may also be awarded.

X. Classification According to Demandability

Obligations may be classified as:

Pure obligations;
Conditional obligations;
Obligations with a period.

XI. Pure Obligations

A. Definition

A pure obligation is one whose performance does not depend on a condition and is not subject to a period.

It is demandable at once.

Example:

A promises to pay B ₱50,000 without any condition or deadline. B may demand payment immediately, unless the nature of the obligation implies otherwise.

B. Legal Effect

Because there is no condition or period, the creditor need not wait for any future event before demanding performance.

XII. Conditional Obligations

A. Definition

A conditional obligation is one whose demandability or extinguishment depends upon the happening of a future and uncertain event, or a past event unknown to the parties.

Example:

“I will give you ₱100,000 if you pass the Bar examinations.”

Passing the Bar is a future and uncertain event.

B. Elements of a Condition

A condition must be:

Future and uncertain; or
Past but unknown to the parties.

A condition affects the existence, demandability, or extinguishment of the obligation.

C. Suspensive Condition

A suspensive condition gives rise to the obligation only upon the happening of the condition.

Example:

A promises to donate a car to B if B graduates from law school.

Until B graduates, A’s obligation is not yet demandable. If B graduates, the obligation arises.

D. Resolutory Condition

A resolutory condition extinguishes an obligation already existing.

Example:

A allows B to use a house until A returns from abroad.

The obligation exists immediately, but it is extinguished when A returns.

E. Potestative Condition

A potestative condition depends on the will of one of the parties.

1. If Dependent Solely on Debtor’s Will

A suspensive condition depending solely on the will of the debtor is generally void.

Example:

“I will pay you if I want to.”

This makes the obligation illusory.

2. If Dependent on Creditor’s Will

A condition depending on the creditor’s will may be valid.

Example:

“I will sell you my car if you decide to buy it by Friday.”

F. Casual Condition

A casual condition depends on chance or the will of a third person.

Example:

“I will give you ₱10,000 if it rains tomorrow.”

G. Mixed Condition

A mixed condition depends partly on the will of a party and partly on chance or the will of a third person.

Example:

“I will pay you a bonus if you obtain approval from the bank.”

H. Possible and Impossible Conditions

1. Possible Conditions

A possible condition can happen according to nature, law, and public policy.

2. Impossible Conditions

Impossible conditions may be physically impossible or legally impossible.

Example of physically impossible condition:

“I will pay you if you swim from Manila to Cebu in one hour.”

Example of legally impossible condition:

“I will give you ₱100,000 if you commit a crime.”

Impossible conditions generally annul the obligation dependent upon them if the condition is positive and suspensive. If the impossible condition is attached to a simple or remuneratory donation or testamentary disposition, special rules may apply.

I. Positive and Negative Conditions

1. Positive Condition

A positive condition requires that an event happen.

Example:

“I will pay you if the building permit is approved.”

2. Negative Condition

A negative condition requires that an event not happen.

Example:

“I will pay you if no case is filed against the property within one year.”

J. Effect of Prevention by the Debtor

If the debtor voluntarily prevents the fulfillment of the condition, the condition is deemed fulfilled.

Example:

A promises to pay B a commission if B closes a sale with C. A then secretly tells C not to deal with B to avoid paying the commission. The condition may be deemed fulfilled.

K. Constructive Fulfillment

The doctrine of constructive fulfillment prevents a debtor from benefiting from bad faith prevention of a condition.

L. Loss, Deterioration, or Improvement Pending Condition

If an obligation to give is subject to a suspensive condition, special rules apply while the condition is pending:

If the thing is lost without debtor’s fault, the obligation is extinguished;
If lost through debtor’s fault, debtor pays damages;
If deteriorated without debtor’s fault, impairment is borne by creditor;
If deteriorated through debtor’s fault, creditor may choose rescission or fulfillment with damages;
If improved by nature or time, improvement benefits the creditor;
If improved at debtor’s expense, debtor has rights similar to a usufructuary.

XIII. Obligations With a Period

A. Definition

An obligation with a period is one whose demandability or extinguishment depends on a future and certain event.

Example:

“I will pay you ₱100,000 on December 31, 2026.”

The date will certainly arrive, although the parties may not know all circumstances surrounding it.

B. Period vs. Condition

A condition is future and uncertain. A period is future and certain.

Example of condition:

“I will pay you if I win the case.”

Example of period:

“I will pay you on June 1, 2026.”

C. Suspensive Period

A suspensive period postpones demandability.

Example:

A promises to pay B on July 1. B cannot demand payment before July 1.

D. Resolutory Period

A resolutory period terminates the obligation upon arrival of the day.

Example:

A leases an apartment to B until December 31. The lease ends on that date, unless renewed.

E. Benefit of the Period

A period is generally presumed to benefit both creditor and debtor unless the tenor of the obligation or circumstances show that it was established for the benefit of one party only.

Example:

A loan payable after one year may benefit the debtor because the debtor has time to pay. It may also benefit the creditor if interest accrues during that year.

F. When Debtor Loses the Benefit of the Period

The debtor may lose the benefit of the period in certain cases, including:

Insolvency after contracting the obligation, unless security is given;
Failure to furnish promised guarantees or securities;
Impairment of securities through debtor’s acts;
Disappearance of securities through fortuitous event unless replaced;
Violation of undertaking in consideration of which the period was granted;
Attempt to abscond.

When the debtor loses the benefit of the period, the obligation may become immediately demandable.

G. When Courts May Fix the Period

If the obligation does not fix a period but it can be inferred that a period was intended, the courts may fix the duration.

Example:

A promises to pay B “when my means permit me.” This may be treated as an obligation with a period, and the court may fix the period.

XIV. Alternative Obligations

A. Definition

An alternative obligation is one where several prestations are due, but performance of one is sufficient.

Example:

A obligates himself to deliver either a car, a motorcycle, or ₱300,000.

A need not perform all. Delivery of one valid prestation extinguishes the obligation.

B. Right of Choice

The right of choice generally belongs to the debtor, unless expressly granted to the creditor.

C. Communication of Choice

The choice produces effect only from the time it is communicated.

Before communication, the obligation remains alternative.

D. Limitations on Choice

The debtor cannot choose prestations that are:

Impossible;
Unlawful;
Not contemplated in the obligation;
Already impossible due to the debtor’s fault, depending on circumstances.

E. Loss of Objects in Alternative Obligations

Rules vary depending on who has the right of choice and whether loss occurred through fault or fortuitous event.

If the debtor has the right of choice and all prestations except one become impossible without debtor’s fault, the debtor must perform the remaining one.

If all are lost through debtor’s fault, the creditor may be entitled to damages.

XV. Facultative Obligations

A. Definition

A facultative obligation is one where only one prestation is due, but the debtor may substitute another.

Example:

A obligates himself to deliver his car, but he may instead deliver his motorcycle.

The car is the principal prestation. The motorcycle is only a substitute.

B. Difference From Alternative Obligation

In an alternative obligation, several prestations are due, but one performance is enough.

In a facultative obligation, only one prestation is due, but the debtor has the option to substitute.

C. Loss of Principal Thing

If the principal thing is lost without debtor’s fault before substitution, the obligation is extinguished.

If the principal thing is lost through debtor’s fault, the debtor is liable for damages.

D. Loss of Substitute Thing

Before substitution, loss of the substitute generally does not affect the obligation because it is not yet due.

After substitution is made, the substitute becomes the object of the obligation.

XVI. Joint Obligations

A. Definition

An obligation is joint when each debtor is liable only for a proportionate part of the debt, and each creditor is entitled only to a proportionate part of the credit.

Joint obligations are presumed unless the law or contract provides solidarity, or the nature of the obligation requires solidarity.

B. Example

A and B jointly owe C ₱100,000.

Unless solidarity is stated, A owes ₱50,000 and B owes ₱50,000.

C cannot demand the entire ₱100,000 from A alone.

C. Legal Effect

In joint obligations:

Each debtor answers only for his share;
Each creditor can demand only his share;
Insolvency of one debtor generally does not increase the liability of the others;
Demand against one debtor does not necessarily affect others beyond their shares.

XVII. Solidary Obligations

A. Definition

An obligation is solidary when each debtor may be compelled to pay the entire obligation, or each creditor may demand full performance, subject to reimbursement among co-debtors or distribution among co-creditors.

Solidarity must be clearly provided by:

Law;
Stipulation;
Nature of the obligation.

B. Passive Solidarity

Passive solidarity exists among debtors.

Example:

A, B, and C solidarily owe D ₱300,000.

D may collect the entire ₱300,000 from A alone. A may then seek reimbursement from B and C for their shares.

C. Active Solidarity

Active solidarity exists among creditors.

Example:

A owes B, C, and D solidarily ₱300,000.

Any one of B, C, or D may demand full payment, subject to accounting among creditors.

D. Mixed Solidarity

Mixed solidarity exists when there are several solidary debtors and several solidary creditors.

E. Words Indicating Solidarity

Words such as “solidarily,” “jointly and severally,” “in solidum,” or equivalent language may create solidarity.

The phrase “jointly and severally” is commonly used in contracts and promissory notes.

F. Effect of Payment by One Solidary Debtor

Payment by one solidary debtor extinguishes the obligation as to the creditor, but the paying debtor may recover from co-debtors their corresponding shares.

G. Defenses Available to Solidary Debtor

A solidary debtor may raise defenses:

Derived from the nature of the obligation;
Personal to the debtor;
Personal to co-debtors, but only as regards their shares.

H. Importance in Practice

Solidary liability is common in:

Co-maker promissory notes;
Surety agreements;
Corporate guarantees;
Loan agreements;
Construction contracts;
Tort cases involving joint wrongdoers;
Obligations imposed by law.

Solidarity is serious because one debtor may be required to pay the entire obligation.

XVIII. Divisible Obligations

A. Definition

An obligation is divisible when it is capable of partial performance.

Example:

A agrees to deliver 1,000 sacks of cement in four equal installments.

Payment of money is generally divisible unless the parties intend indivisibility.

B. Legal Effect

In divisible obligations, partial performance may be possible and legally meaningful.

However, the creditor cannot be compelled to accept partial performance unless there is stipulation or law allowing it.

XIX. Indivisible Obligations

A. Definition

An obligation is indivisible when it cannot be validly performed in parts.

Example:

A agrees to deliver a specific horse. The horse cannot be delivered by halves.

B. Types of Indivisibility

Indivisibility may arise from:

Nature of the prestation;
Law;
Intention of the parties.

C. Examples

Delivery of a determinate car;
Construction of a complete house;
Singing at a specific event;
Delivery of a specific painting;
Obligation not to disclose confidential information.

D. Divisibility vs. Solidarity

Divisibility concerns the prestation. Solidarity concerns the legal tie among parties.

An obligation can be indivisible but joint.

Example:

A and B jointly promise to deliver a specific car to C. The car is indivisible, but the liability may still be joint unless solidarity is provided.

XX. Obligations With a Penal Clause

A. Definition

An obligation with a penal clause is one where the parties attach a penalty to secure performance or punish breach.

Example:

A contractor agrees to pay ₱10,000 per day of delay in completing a building.

B. Purpose

The penalty may serve to:

Strengthen performance;
Pre-estimate damages;
Penalize non-compliance;
Avoid proving actual damages;
Encourage timely performance.

C. Penalty as Substitute for Damages

Generally, the penalty substitutes for damages and interest in case of breach, unless there is stipulation allowing recovery of both or the debtor acted with fraud.

D. When Penalty May Be Reduced

Courts may reduce the penalty if:

The principal obligation was partly or irregularly performed;
The penalty is iniquitous or unconscionable.

Example:

A ₱10,000 loan with a ₱100,000 penalty for one day delay may be reduced.

E. Penalty and Specific Performance

The creditor generally cannot demand both performance and penalty unless this right is clearly granted.

XXI. Classification According to Number of Parties

Obligations may involve:

One debtor and one creditor;
Several debtors;
Several creditors;
Several debtors and creditors.

This classification affects whether the obligation is joint or solidary and how payment, demand, and enforcement operate.

XXII. Classification According to Object: Simple and Multiple Obligations

A. Simple Obligation

A simple obligation has only one prestation.

Example:

A must pay B ₱50,000.

B. Multiple Obligation

A multiple obligation has several prestations.

It may be:

Conjunctive;
Distributive;
Alternative;
Facultative.

C. Conjunctive Obligation

In a conjunctive obligation, the debtor must perform all prestations.

Example:

A agrees to deliver a laptop, install software, and train B’s staff.

All must be performed.

D. Distributive Obligation

A distributive obligation involves several prestations, but not all may be required depending on the structure. Alternative and facultative obligations fall under this broader category.

XXIII. Positive and Negative Obligations

A. Positive Obligation

A positive obligation requires the debtor to give or do something.

Examples:

Pay money;
Deliver goods;
Repair a house;
Perform services.

B. Negative Obligation

A negative obligation requires the debtor not to do something.

Examples:

Not to compete;
Not to disclose confidential information;
Not to build on a restricted area;
Not to sell to third persons;
Not to disturb possession.

XXIV. Real and Personal Obligations

A. Real Obligation

A real obligation is an obligation to give.

Example:

A must deliver a parcel of land to B.

B. Personal Obligation

A personal obligation is an obligation to do or not to do.

Examples:

To build a house;
To render accounting services;
Not to disclose trade secrets.

XXV. Determinate and Generic Obligations

A. Determinate Obligation

The object is specific and identifiable.

Example:

Delivery of “the condominium unit covered by CCT No. 12345.”

B. Generic Obligation

The object is identified only by class.

Example:

Delivery of “one brand-new laptop with at least 16GB RAM.”

C. Limited Generic Obligation

A limited generic obligation is confined to a particular class or source.

Example:

A promises to deliver “one of the ten cars in my garage.”

This is not purely generic because the object must come from a limited group.

XXVI. Civil and Natural Obligations

A. Civil Obligation

A civil obligation gives a right of action to compel performance.

Example:

A owes B ₱100,000 under a written loan agreement. B may sue to collect.

B. Natural Obligation

A natural obligation is based on equity and natural law but does not grant a court action to compel performance. However, if voluntarily performed, the debtor cannot generally recover what was delivered or paid.

Example:

A debt has prescribed. The creditor can no longer sue. If the debtor voluntarily pays despite knowing prescription, the debtor cannot demand the money back merely because the action had prescribed.

C. Importance

Natural obligations explain why certain voluntary payments are legally recognized even though the creditor could no longer compel payment.

XXVII. Unilateral and Bilateral Obligations

A. Unilateral Obligation

Only one party is bound to perform.

Example:

A promises to donate a specific item to B, and the donation is validly perfected under the law.

B. Bilateral Obligation

Both parties are bound to perform reciprocal prestations.

Example:

In a sale, the seller must deliver the thing and the buyer must pay the price.

XXVIII. Reciprocal Obligations

A. Definition

Reciprocal obligations arise from the same cause, where each party is both debtor and creditor of the other.

Example:

In a contract of sale, the seller is debtor as to delivery and creditor as to price. The buyer is debtor as to price and creditor as to delivery.

B. Remedy of Rescission

In reciprocal obligations, if one party fails to comply, the injured party may choose between fulfillment and rescission, with damages in either case.

Example:

If the buyer does not pay, the seller may seek payment or rescission, subject to applicable rules.

C. Mutual Restitution

If rescission is granted, the parties generally return what they received.

XXIX. Principal and Accessory Obligations

A. Principal Obligation

A principal obligation can stand by itself.

Example:

Borrower’s obligation to pay a loan.

B. Accessory Obligation

An accessory obligation depends on a principal obligation.

Examples:

Mortgage securing a loan;
Pledge securing a debt;
Guaranty;
Suretyship;
Penal clause;
Interest obligation.

If the principal obligation is extinguished, the accessory obligation is generally extinguished as well, unless the law or agreement provides otherwise.

XXX. Obligations According to Sanction: Civil, Natural, and Moral Duties

A. Civil Obligations

Legally enforceable by court action.

B. Natural Obligations

Not enforceable by action, but voluntary performance has legal effect.

C. Moral Duties

Purely moral duties are not legally enforceable and do not necessarily produce legal effects unless transformed into legal obligations by law or contract.

Example:

A moral duty to help a friend is not enforceable unless there is a legal agreement or statutory basis.

XXXI. Obligations According to Performance: Instantaneous, Periodic, and Continuing

A. Instantaneous Obligation

Performance occurs at one time.

Example:

Payment of a purchase price upon delivery.

B. Periodic Obligation

Performance occurs at intervals.

Example:

Monthly rent, installment payments, monthly service fees.

C. Continuing Obligation

Performance or abstention continues over time.

Examples:

Lease obligation to maintain peaceful possession;
Non-disclosure agreement;
Support obligation;
Employment obligation during the employment period.

XXXII. Obligations According to Cause: Onerous, Gratuitous, and Remuneratory

A. Onerous Obligation

Each party gives or performs something in exchange.

Example:

Sale, lease, service contract.

B. Gratuitous Obligation

One party gives a benefit without equivalent return.

Example:

Donation.

C. Remuneratory Obligation

The obligation is imposed as reward for a service or benefit previously rendered.

Example:

A person promises to give compensation to another for saving property from destruction, where the promise is legally valid.

XXXIII. Obligations According to Object: Monetary and Non-Monetary

A. Monetary Obligation

The prestation is payment of money.

Examples:

Loan repayment;
Purchase price;
rent;
damages;
salary;
professional fees.

Monetary obligations often involve interest, penalties, legal interest, and damages for delay.

B. Non-Monetary Obligation

The prestation is not payment of money.

Examples:

Deliver a vehicle;
construct a building;
transfer shares;
refrain from competition;
maintain confidentiality.

XXXIV. Obligations According to Determination of Amount: Liquidated and Unliquidated

A. Liquidated Obligation

The amount is determined or readily determinable.

Example:

A promissory note for ₱500,000.

B. Unliquidated Obligation

The amount is not yet fixed and must be determined by evidence, agreement, accounting, or court judgment.

Example:

Damages for injury, business losses, or moral damages.

XXXV. Obligations According to Breach: Delay, Fraud, Negligence, and Contravention

A debtor may become liable for damages if breach occurs through:

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

A. Delay

Delay, or mora, occurs when the debtor fails to perform on time after demand, unless demand is unnecessary under law or contract.

Types of delay include:

Mora solvendi — delay by debtor;
Mora accipiendi — delay by creditor in accepting performance;
Compensatio morae — delay in reciprocal obligations.

B. Fraud

Fraud in performance means deliberate evasion of the normal fulfillment of the obligation.

Waiver of future fraud is void.

C. Negligence

Negligence is failure to observe the diligence required by the nature of the obligation and circumstances of persons, time, and place.

D. Contravention of Tenor

This means violation of the terms of the obligation.

Example:

A contractor uses substandard materials despite the contract requiring specified materials.

XXXVI. Diligence Required in Obligations

The debtor must exercise the diligence required by:

Law;
Stipulation;
Nature of the obligation;
Circumstances of persons, time, and place.

If the law or contract does not state the diligence required, the standard is generally diligence of a good father of a family.

XXXVII. Fortuitous Events and Obligations

A. General Rule

No person is responsible for events that could not be foreseen, or which, though foreseen, were inevitable.

B. Exceptions

A debtor may still be liable despite fortuitous event when:

Law provides liability;
Stipulation provides liability;
Nature of the obligation requires assumption of risk;
Debtor is in delay;
Debtor promised to deliver the same thing to two or more persons with different interests;
Debtor is guilty of negligence, fraud, or bad faith contributing to loss.

C. Relevance to Kinds of Obligations

Fortuitous event affects determinate and generic obligations differently. A determinate thing may perish. A generic thing generally does not.

XXXVIII. Remedies for Breach According to Kind of Obligation

A. In Obligation to Give

The creditor may seek:

Specific performance;
Delivery of the thing;
Damages;
Rescission in proper cases;
Recovery of fruits, accessions, and accessories;
Substitute performance for generic things.

B. In Obligation to Do

The creditor may seek:

Performance by another at debtor’s cost, if possible;
Undoing of defective performance;
Damages;
Rescission in reciprocal obligations.

C. In Obligation Not to Do

The creditor may seek:

Undoing of prohibited act, if possible;
Injunction in proper cases;
Damages;
Rescission, if reciprocal and applicable.

XXXIX. Extinguishment of Obligations

Obligations may be extinguished by:

Payment or performance;
Loss of the thing due;
Condonation or remission;
Confusion or merger of rights;
Compensation;
Novation;
Annulment;
Rescission;
Fulfillment of resolutory condition;
Prescription;
Other causes provided by law.

The mode of extinguishment may operate differently depending on the kind of obligation.

XL. Payment or Performance

Payment means not only delivery of money but performance of the obligation.

In obligations to give, payment is delivery. In obligations to do, payment is performance. In obligations not to do, payment is abstention.

A. Complete Performance

The creditor cannot generally be compelled to accept partial performance.

B. Substantial Performance

If performance was made in good faith and substantially complies with the obligation, the debtor may recover as though there had been strict performance, less damages for defects.

C. Application to Different Kinds

Divisible obligations may allow partial performance more naturally. Indivisible obligations generally require complete performance.

XLI. Loss of the Thing Due

Loss of the thing due extinguishes the obligation only under specific circumstances.

A. Determinate Thing

If a determinate thing is lost without debtor’s fault and before delay, the obligation may be extinguished.

B. Generic Thing

A generic thing generally does not perish. The debtor must deliver another of the same kind.

C. Fault or Delay

If loss occurs through debtor’s fault or after delay, the debtor may be liable for damages.

XLII. Condonation or Remission

Condonation is gratuitous forgiveness of debt.

It may be:

Express;
Implied;
Total;
Partial.

It is subject to rules on donations and must comply with formalities where required.

XLIII. Confusion or Merger

Confusion occurs when the characters of creditor and debtor are merged in the same person.

Example:

A owes B ₱100,000. B dies and A becomes B’s sole heir. The obligation may be extinguished by merger, subject to estate and legal rules.

XLIV. Compensation

Compensation occurs when two persons are creditors and debtors of each other.

Example:

A owes B ₱100,000. B owes A ₱70,000. Their obligations may be compensated up to ₱70,000, leaving A owing ₱30,000.

Compensation may be:

Legal;
Voluntary;
Judicial;
Facultative.

XLV. Novation

Novation extinguishes an obligation by substituting or changing it.

It may involve:

Change of object or principal conditions;
Substitution of debtor;
Subrogation of creditor.

Novation is never presumed. It must be clear.

Example:

A loan originally payable in cash is replaced by a new agreement where debtor transfers a vehicle in full settlement. If clearly intended, novation may occur.

XLVI. Practical Examples of Kinds of Obligations

A. Loan Payable on Demand

A borrows ₱50,000 from B payable on demand.

This is a monetary obligation, obligation to give, and may be pure or subject to demand depending on wording.

B. Sale of Specific Car

A sells to B a Toyota Fortuner with plate number XYZ 999.

This is an obligation to give a determinate thing.

C. Construction Contract

A contractor agrees to build a house.

This is an obligation to do. It may be reciprocal, onerous, and indivisible or divisible depending on contract terms.

D. Non-Compete Clause

A seller agrees not to operate a competing business within two kilometers for two years.

This is an obligation not to do, negative, personal, and continuing.

E. Loan With Co-Makers

A, B, and C sign a note “jointly and severally” liable for ₱300,000.

This is a solidary obligation. The creditor may collect the entire amount from any one of them.

F. Delivery of Rice or Corn

A promises to deliver either 100 sacks of rice or 100 sacks of corn.

This is an alternative obligation.

G. Delivery of Car With Option to Substitute Motorcycle

A promises to deliver his car but reserves the right to deliver his motorcycle instead.

This is a facultative obligation.

H. Scholarship Promise

A promises to give B ₱100,000 if B passes the CPA board exam.

This is a conditional obligation subject to a suspensive condition.

I. Lease Until a Specific Date

A leases land to B until December 31, 2027.

This is an obligation with a resolutory period.

J. Contract With Liquidated Damages

A contractor must pay ₱5,000 per day of delay.

This is an obligation with a penal clause.

XLVII. Common Mistakes in Understanding Obligations

A. Confusing Period With Condition

A fixed date is a period, not a condition. An uncertain event is usually a condition.

B. Assuming Several Debtors Are Always Solidary

The default rule is joint liability, not solidarity, unless law, contract, or nature of obligation provides otherwise.

C. Assuming Partial Payment Must Always Be Accepted

A creditor generally cannot be compelled to accept partial performance unless law or agreement allows it.

D. Assuming Loss Always Excuses Performance

Loss may excuse delivery of a determinate thing without fault before delay. It generally does not excuse delivery of a generic thing.

E. Assuming Penalties Are Always Enforced in Full

Courts may reduce iniquitous or unconscionable penalties.

F. Assuming Oral Interest Is Always Recoverable

Monetary interest generally must be expressly stipulated in writing.

G. Assuming Contract Terms Are Unlimited

Parties may stipulate terms, but not those contrary to law, morals, good customs, public order, or public policy.

XLVIII. Importance in Litigation

The kind of obligation determines:

What must be alleged in the complaint;
What defenses may be raised;
Whether demand is necessary;
Whether delay exists;
Whether specific performance is available;
Whether damages may be recovered;
Whether rescission is proper;
Whether co-debtors are liable for the whole or only part;
Whether the obligation survived loss;
Whether prescription applies;
Whether a penalty may be reduced;
Whether partial performance is acceptable.

A correct classification can decide the outcome of a case.

XLIX. Practical Drafting Tips

When drafting contracts, parties should clearly state:

Who is the creditor;
Who is the debtor;
Exact prestation;
Whether the thing is determinate or generic;
Due date or period;
Conditions, if any;
Whether liability is joint or solidary;
Whether performance is divisible;
Penalties for breach;
Interest, if monetary;
Demand requirements;
Events of default;
Remedies;
Force majeure rules;
Notices;
Governing law and venue.

Clarity prevents litigation.

L. Frequently Asked Questions

1. What are the main kinds of obligations under Philippine civil law?

The main kinds include pure, conditional, obligations with a period, alternative, facultative, joint, solidary, divisible, indivisible, and obligations with a penal clause.

2. What is a pure obligation?

It is an obligation not subject to a condition or period and is demandable at once.

3. What is a conditional obligation?

It is an obligation whose demandability or extinguishment depends on a future and uncertain event or a past event unknown to the parties.

4. What is an obligation with a period?

It is an obligation whose demandability or extinguishment depends on a future and certain event.

5. What is the difference between condition and period?

A condition is uncertain. A period is certain to arrive.

6. What is an alternative obligation?

It is an obligation where several prestations are due, but performance of one is sufficient.

7. What is a facultative obligation?

It is an obligation where one prestation is due, but the debtor may substitute another.

8. What is the difference between joint and solidary obligation?

In a joint obligation, each debtor is liable only for his share. In a solidary obligation, one debtor may be required to pay the whole obligation.

9. Is solidarity presumed?

No. Solidarity must be clearly provided by law, contract, or the nature of the obligation.

10. What is an indivisible obligation?

It is an obligation that cannot be validly performed in parts.

11. What is an obligation with a penal clause?

It is an obligation with an attached penalty for non-performance or breach.

12. Can courts reduce penalties?

Yes. Courts may reduce penalties that are iniquitous, unconscionable, or where there has been partial or irregular performance.

13. What is an obligation to give?

It is an obligation to deliver a thing.

14. What is an obligation to do?

It is an obligation to perform an act or service.

15. What is an obligation not to do?

It is an obligation to abstain from an act.

LI. Conclusion

Obligations under Philippine civil law are classified in many ways because different legal consequences follow from each kind. An obligation may arise from law, contract, quasi-contract, crime, or quasi-delict. It may require a person to give, to do, or not to do. It may be pure, conditional, subject to a period, alternative, facultative, joint, solidary, divisible, indivisible, or subject to a penal clause.

These classifications are not merely academic. They determine when an obligation becomes demandable, who may be sued, how much each debtor must pay, whether partial performance is allowed, whether loss of the object extinguishes the obligation, whether penalties may be reduced, and what remedies are available upon breach.

In contracts, careful drafting is essential. Parties should clearly identify the prestation, due date, conditions, penalties, interest, liability of multiple parties, and consequences of breach. In disputes, correct classification of the obligation is often the key to determining rights, defenses, and remedies.

The Civil Code’s law on obligations provides the structure for enforcing private rights in the Philippines. Whether the case involves a loan, sale, lease, service contract, damages claim, family support, business transaction, or property dispute, understanding the kind of obligation involved is the first step toward understanding the legal remedy.