Prescription is one of the most important doctrines in Philippine law because it determines how long a person may still bring a legal action before the claim is barred by the passage of time. In practical terms, even a valid right may become unenforceable if the action is filed too late. In the Philippines, prescription affects civil actions, criminal actions, tax-related actions, labor claims, property disputes, family and succession matters, and many special statutory causes of action.

This article explains the doctrine in Philippine context, the governing principles, the main prescription periods under the Civil Code and special laws, how prescription is computed, when it is interrupted or suspended, and the major distinctions that lawyers and litigants must always keep in mind.

I. Meaning of Prescription

In Philippine law, “prescription” generally refers to the acquisition or loss of rights through the lapse of time under conditions fixed by law.

There are two broad kinds:

1. Acquisitive prescription

This is the acquisition of ownership or other real rights through possession over time. It is also called usucapion.

2. Extinctive prescription

This is the loss of the right to sue because an action is not brought within the period fixed by law.

The present topic concerns prescription of legal actions, which is primarily extinctive prescription.

II. Prescription Distinguished From Related Concepts

Prescription is often confused with other legal concepts. The distinctions matter.

A. Prescription vs. Laches

Prescription is based on a fixed period established by law. Laches is based on equity: an unreasonable delay in asserting a right, causing prejudice to another.

A claim may still be within the statutory prescriptive period and yet be vulnerable to laches in exceptional situations. Conversely, where the law clearly fixes a period, courts generally first look to prescription.

B. Prescription vs. Statute of Limitations

In Philippine usage, these terms are often used interchangeably. “Prescription” is the civil law term; “statute of limitations” is the common law expression.

C. Prescription vs. Peremption / Jurisdictional Deadlines

Some periods are not merely prescriptive but mandatory and jurisdictional, especially in election law, appeals, and certain administrative remedies. Failure to comply does not merely bar the action; it may deprive the tribunal of authority to act.

D. Prescription vs. Condition Precedent

Some causes of action require prior demand, barangay conciliation, or exhaustion of administrative remedies. The prescriptive period may still run, subject to rules on interruption or suspension depending on the law and circumstances.

III. Main Sources of Philippine Law on Prescription

The governing rules come from multiple sources:

Civil Code of the Philippines
Revised Penal Code
Special penal laws
Labor Code
National Internal Revenue Code
Rules of Court
Property registration and land laws
Insurance Code
Corporation law and securities laws
Local government and administrative laws
Special statutes for consumer, transportation, banking, intellectual property, and other regulated fields

Because Philippine law is statutory, the specific law governing the specific cause of action always controls over general provisions.

IV. Basic Rule: Determine the Nature of the Cause of Action

To know the correct prescriptive period, the first question is:

What is the true nature of the action?

The label used in the complaint does not control. Courts look at the actual allegations and relief sought. A case described as “damages” may really be:

an action on a written contract,
an action upon an injury to rights,
an action based on fraud,
a real action involving immovable property,
an action to enforce a judgment,
or a labor, tax, insurance, or criminal matter governed by a special law.

Mischaracterizing the action often leads to the wrong filing period.

V. General Civil Code Rules on Prescription of Actions

The Civil Code contains the principal framework.

A. Actions That Must Be Brought Within Ten Years

A common rule is that the following actions prescribe in ten years:

1. Upon a written contract

If the obligation is based on a written agreement, the action generally prescribes in ten years from the time the cause of action accrues.

Examples:

collection based on a signed loan agreement,
enforcement of a written promissory note,
action for breach of a written lease,
action on a written acknowledgment of debt.

2. Upon an obligation created by law

This refers to obligations arising directly from law, not from contract, quasi-contract, delict, or quasi-delict, unless a special law provides another period.

3. Upon a judgment

An action upon a judgment generally prescribes in ten years, though procedural rules on execution and revival must also be observed.

This area requires an important distinction:

A final judgment may be executed by motion within the period allowed by procedural rules.
After that, and before the ten-year period lapses, it may still be enforced by independent action to revive the judgment.

4. Upon a mortgage

An action to enforce a written mortgage generally falls under the ten-year period, subject to special property and foreclosure rules.

B. Actions That Must Be Brought Within Six Years

1. Upon an oral contract

Where the agreement is not in writing, the action generally prescribes in six years.

Examples:

verbal loan agreements,
oral sale arrangements,
unwritten service agreements.

2. Upon a quasi-contract

Quasi-contracts include obligations arising from lawful, voluntary, and unilateral acts to prevent unjust enrichment.

Examples:

solutio indebiti,
negotiorum gestio.

C. Actions That Must Be Brought Within Four Years

A major category under Philippine law is four years.

1. Upon an injury to the rights of the plaintiff

This broad provision often covers actions where no more specific period applies.

2. Upon a quasi-delict

This is extremely important.

A quasi-delict is fault or negligence causing damage, where there is no pre-existing contractual relation, or the action is pursued independently of contract. The action generally prescribes in four years.

Examples:

negligence causing personal injury,
vehicular accident claims framed as quasi-delict,
property damage from negligent acts.

3. For defamation

Civil actions for damages arising from defamation generally fall within the four-year period unless special rules apply to the specific claim.

4. For actions based on fraud

The period is generally four years, often counted from discovery in cases where the law so provides, depending on the nature of the relief and the governing article.

5. For actions upon an oral defamation or other analogous tortious injury

The exact classification matters, but many such civil injury actions are governed by four years.

D. Actions That Must Be Brought Within One Year

1. For forcible entry and unlawful detainer

These ejectment actions prescribe in one year.

The one-year period is critical and depends on the kind of ejectment:

Forcible entry: generally counted from actual entry by force, intimidation, threat, strategy, or stealth; in stealth cases, jurisprudence has treated the period as counted from discovery and demand to vacate in proper situations.
Unlawful detainer: counted from the date possession became unlawful, usually after expiration or termination of the right to possess and demand to vacate.

This one-year period determines whether the case is an ejectment case in the first-level court or must instead be filed as an accion publiciana or accion reivindicatoria.

2. For actions for defamation in criminal context

Civil and criminal aspects must be distinguished carefully because criminal prescription is governed differently.

3. Certain special or summary actions

Some possessory or provisional remedies may have their own short periods.

E. Actions That Must Be Brought Within Five Years

The Civil Code also recognizes a five-year period for certain actions not covered by the more familiar ten-six-four-one structure, especially in relation to specific provisions or particular rights. The exact article and nature of the claim must be checked, because many five-year periods in Philippine law arise under special laws rather than the general Civil Code scheme.

F. Thirty-Year Period for Real Actions Over Immovables

An action involving real property may be governed by a thirty-year period where the law so provides, particularly actions involving ownership or other real rights over immovable property.

A classic rule is that real actions over immovables prescribe in thirty years, without prejudice to the rules on acquisitive prescription, registration, co-ownership, trust, and title disputes.

This is one of the most misunderstood areas because not all land-related actions are automatically subject to thirty years.

The true period depends on whether the suit is:

an action to recover possession,
an action to recover ownership,
an action based on implied trust,
an annulment of title,
a reconveyance suit,
a quieting of title action,
or an ejectment case.

The Torrens system also changes the analysis in important ways.

VI. When Prescription Begins to Run

Prescription does not begin simply because an agreement exists or a wrong happened. It begins when the cause of action accrues.

A cause of action accrues when the last element necessary to complete the cause of action occurs, typically when:

a right in favor of the plaintiff exists,
a corresponding obligation rests on the defendant,
and the defendant violates that right.

Examples

Written loan with maturity date

If a promissory note is due on June 1, prescription usually begins on June 2 if unpaid.

Loan payable on demand

The analysis may differ depending on whether demand is necessary to create default or whether the obligation is immediately due. The terms of the instrument matter.

Installment obligations

Prescription may run separately for each installment as each becomes due, unless the contract contains an acceleration clause that is validly invoked.

Fraud discovered later

For actions where the law counts from discovery of fraud, the reckoning point is not necessarily the date of the fraudulent act itself.

Tort or quasi-delict

The period usually runs from the occurrence of the wrongful act or resulting injury, depending on the structure of the cause of action.

VII. Interruption of Prescription

Prescription may be interrupted. Under the Civil Code, prescription of actions is interrupted by:

1. Filing of the action in court

Once the action is filed, the running of the period is interrupted.

2. A written extrajudicial demand by the creditor

A proper written demand can interrupt prescription.

3. A written acknowledgment of the debt by the debtor

An express written acknowledgment restarts the period.

These rules are very important in collection cases.

Practical consequences

If a creditor sends a written demand letter before the period expires, the running of prescription is interrupted. If the debtor later signs a written acknowledgment or partial-payment document amounting to written recognition, a new period may begin, depending on the circumstances.

Important caution

Not every communication is enough. Questions that arise in practice include:

Was the demand written?
Was it clear and unequivocal?
Was it actually sent to or received by the debtor?
Was the acknowledgment truly an admission of the debt?
Did the communication concern the same obligation now sued upon?

These are often factual matters.

VIII. Suspension of Prescription

Interruption and suspension are not always the same.

Interruption stops the running and may cause the period to start anew.
Suspension pauses the running while a legally recognized impediment exists.

Civil Code provisions and special laws recognize situations where prescription does not run or is tolled.

Common examples include:

1. Between spouses during marriage

Prescription generally does not run between husband and wife during the marriage in matters covered by law.

2. Between parents and children during minority or insanity

Certain disabilities affect the running of prescription.

3. Between guardian and ward during guardianship

The law protects the ward from adverse prescription during the fiduciary relation.

4. During minority, insanity, or other incapacities in specific contexts

The Civil Code contains provisions addressing persons under disability, though not every disability suspends every action. The exact provision matters.

5. During pendency of required prior proceedings, in some cases

Where the law requires a preliminary process before suit may proceed, prescription questions can become complex.

6. During force majeure or war, in exceptional statutory settings

This depends on the applicable law and is not a universal rule.

IX. Prescription in Actions Involving Contracts

Contract disputes are among the most frequent prescription issues.

A. Written Contracts — 10 Years

This applies where the obligation sued upon is embodied in writing.

Common examples:

loan agreements,
lease contracts,
deeds of sale with enforceable undertakings,
indemnity agreements,
written suretyship undertakings,
promissory notes.

Issues that commonly arise

Whether the document is complete enough to be treated as a written contract
Whether the suit is really based on the writing or on a collateral injury
Whether amendments, novation, or restructuring created a new reckoning period
Whether acceleration clauses matured the entire obligation earlier

B. Oral Contracts — 6 Years

If the agreement is purely oral, six years usually applies.

Proof problem

Even if the action is filed within six years, the plaintiff still bears the burden of proving the oral agreement.

C. Actions on Promissory Notes and Negotiable Instruments

A promissory note that is written usually falls within the ten-year rule for written contracts, subject to special commercial and banking considerations.

Questions often include:

date of maturity,
acceleration,
whether the note was renewed,
whether partial payment interrupted prescription,
whether a surety or guarantor remains liable.

D. Rescission, Annulment, Reformation, and Specific Contract Remedies

Not all contract-related actions use the same period.

For example:

actions for annulment of voidable contracts have their own periods and reckoning rules,
rescissible contracts follow separate provisions,
reformation and declaratory relief may present distinct analyses,
actions to declare contracts void are generally not subject to the same prescriptive rules as voidable contracts.

X. Prescription in Actions Involving Void, Voidable, Rescissible, and Unenforceable Contracts

This is a classic area of confusion.

A. Void Contracts

Actions to declare a contract void are generally considered imprescriptible, because a void contract produces no legal effect from the beginning.

However, while the action to declare nullity may be imprescriptible, related actions such as reconveyance, recovery of possession, or damages may still prescribe.

B. Voidable Contracts

Actions for annulment of a voidable contract prescribe in four years.

The reckoning point depends on the ground:

intimidation, violence, or undue influence: from the time the defect ceases;
mistake or fraud: from discovery;
contracts entered into by minors or incapacitated persons: from the time guardianship ends or incapacity ceases, as applicable.

C. Rescissible Contracts

Actions to rescind a rescissible contract also prescribe in four years, under rules specific to the type of rescission.

D. Unenforceable Contracts

The Statute of Frauds and related defenses concern enforceability, not necessarily prescription. The issue is different from lapse of the prescriptive period.

XI. Prescription in Property and Land Cases

Land litigation is one of the most difficult prescription areas in the Philippines.

A. Ejectment — 1 Year

As noted, forcible entry and unlawful detainer have a one-year period.

B. Accion Publiciana

This is an ordinary civil action to recover the right to possess real property when dispossession has lasted for more than one year.

It is not the summary ejectment action. The applicable period depends on the character of the claim and the relevant rules, often within the broader framework of real actions.

C. Accion Reivindicatoria

This is an action to recover ownership and possession. Real actions over immovables may prescribe in thirty years, subject to title registration and acquisitive prescription rules.

D. Registered Land Under the Torrens System

Registered land creates special consequences.

1. Action to recover against a titled owner

An action against land covered by a Torrens title is heavily affected by indefeasibility, the one-year period to review a decree in some registration contexts, and limits on collateral attack.

2. Reconveyance based on fraud

An action for reconveyance may prescribe, often depending on whether the plaintiff is in possession and whether the action is based on an implied or constructive trust.

A common framework in jurisprudence is:

if a title was wrongfully issued through fraud, an action for reconveyance may prescribe after a certain period from issuance of title or from discovery, depending on the theory;
but if the plaintiff remains in possession and merely seeks quieting of title, prescription may not run in the same way.

3. Quieting of title

If the plaintiff is in actual possession and seeks to remove a cloud on title, the action may in some situations be treated as imprescriptible.

E. Co-ownership

Prescription generally does not run in favor of one co-owner against another unless there is clear repudiation of the co-ownership communicated to the others.

This is a major doctrine. Mere possession by one co-owner is usually deemed possession on behalf of all co-owners. Prescription begins only upon unequivocal repudiation known to the others.

F. Trusts

Express trusts

As a rule, prescription does not run against an express trust while the trust is recognized and not repudiated.

Implied or constructive trusts

Actions based on implied or constructive trusts may prescribe. In land cases, reconveyance based on implied trust is a frequent example.

XII. Prescription in Actions for Damages

“Damages” is only a remedy, not a self-contained cause of action. One must identify the source of the wrong.

A. Damages from breach of written contract

10 years

B. Damages from breach of oral contract

6 years

C. Damages from quasi-delict or injury to rights

4 years

D. Damages tied to property possession issues

May follow the period governing the principal real action

E. Moral, exemplary, nominal damages

These do not carry separate independent prescriptive periods apart from the main cause of action.

XIII. Prescription in Quasi-Delicts and Negligence Cases

The typical rule is four years.

Examples:

road accidents,
medical negligence framed as quasi-delict,
employer liability under quasi-delict principles,
negligent property damage.

Contract vs. quasi-delict overlap

Sometimes the same facts may support:

an action for breach of contract, or
an action for quasi-delict.

The chosen theory affects prescription.

Example: A passenger injured in a bus accident may sue for breach of contract of carriage, which may follow the period for written contract if based on the ticketed contractual relation, or may involve a different theory depending on the pleadings and facts. Careful pleading matters.

XIV. Prescription in Fraud Cases

Fraud creates several possible actions, each with its own rule.

1. Annulment of contract on ground of fraud

4 years from discovery

2. Action for damages based on fraud

Often 4 years, depending on the cause of action framed

3. Reconveyance due to fraudulent registration

Subject to special land-title rules and jurisprudence

4. Action to declare contract void due to absolute simulation or illegality

May be imprescriptible if the contract is void

The key is always the legal theory invoked.

XV. Prescription of Judgments

Once a judgment becomes final:

A. Execution by motion

A final and executory judgment may generally be executed by motion within the period fixed by the Rules of Court.

B. Revival by independent action

After that period, but within the ten-year period from finality, a separate action to revive judgment may be brought.

Failure to revive within the ten-year period generally bars enforcement.

This is an area where practitioners must distinguish between:

life of the judgment,
period for execution by motion,
period for revival,
and whether there has been partial satisfaction or acknowledgment.

XVI. Criminal Prescription

Prescription also applies in criminal law, but the rules are different.

A. Prescription of Crimes

Under the Revised Penal Code, crimes prescribe depending on the penalty attached by law.

The periods differ according to the gravity of the offense and the penalty prescribed. The prescription of crimes generally begins from the day the crime is discovered by the offended party, authorities, or their agents, and is interrupted by the filing of the complaint or information, subject to specific doctrinal refinements.

General framework under the Revised Penal Code

More serious offenses carry longer prescription periods; light offenses carry very short periods.

Because amendments and special penal statutes may alter the scheme, one must always verify:

whether the offense is under the Revised Penal Code or a special law,
what penalty is prescribed,
whether there was discovery later,
whether filing before the prosecutor or court interrupted prescription under the governing doctrine.

B. Prescription of Penalties

This is different from prescription of crimes.

A penalty already imposed by final judgment may itself prescribe if not enforced within the statutory period, computed under the penal law.

C. Special Penal Laws

Offenses under special laws may follow their own prescription rules. Some adopt the Revised Penal Code suppletorily; others contain their own periods.

XVII. Prescription in Libel and Defamation

Libel in the Philippines is especially sensitive because the prescriptive period depends on whether the action is:

a criminal action for libel,
a civil action for damages due to defamation,
or another communications-related offense under special legislation.

Criminal libel under special statutes may have shorter periods than ordinary civil actions for damages. One must avoid assuming the same period applies to both civil and criminal dimensions.

XVIII. Prescription in Labor Cases

Labor law contains many special periods.

A. Money Claims

Money claims arising from employer-employee relations are generally subject to a three-year prescriptive period from the time the cause of action accrued, unless a different specific rule applies.

Examples:

unpaid wages,
overtime pay,
holiday pay,
service incentive leave pay,
salary differentials,
13th month differentials.

Each unpaid benefit may accrue at different times.

B. Illegal Dismissal

Illegal dismissal complaints generally carry a four-year period because they are treated as injury to rights.

C. Unfair Labor Practice

ULP complaints have their own shorter statutory prescriptive periods.

D. Work-related injury or compensation claims

These may be governed by special compensation laws and administrative rules rather than ordinary Civil Code periods.

Labor prescription is a classic example of a field where special law prevails over the Civil Code.

XIX. Prescription in Tax Cases

Tax law has special and technical prescriptive periods.

A. Government assessment of internal revenue taxes

The Bureau of Internal Revenue generally must assess taxes within the statutory period fixed by the National Internal Revenue Code, usually counted from the last day prescribed for filing the return or from the day the return was filed, whichever applies, subject to exceptions such as false or fraudulent returns or failure to file.

B. Collection by distraint, levy, or court action

After valid assessment, collection must also be made within the statutory period.

C. Claims for refund

Tax refund claims are governed by strict periods, often treated as mandatory and jurisdictional. Filing in the wrong forum or outside the statutory deadline is usually fatal.

Tax prescription is highly specialized and often not merely a simple civil prescription issue.

XX. Prescription in Insurance Claims

Insurance law also has its own rules.

A. Action on policy

Claims under an insurance contract may be subject to contractual and statutory limitation periods. Policies sometimes stipulate a period within which suit must be brought, subject to the Insurance Code and public policy limits.

B. Notice and proof-of-loss requirements

These are not always prescriptive periods but conditions precedent.

C. Marine, fire, life, and casualty claims

The exact rule depends on the type of policy and the wording of the contract, as long as it is consistent with law.

XXI. Prescription in Transportation and Carriage

Claims involving common carriers may arise from:

breach of contract of carriage,
quasi-delict,
maritime law,
carriage of goods,
international conventions.

The applicable period varies depending on whether the claim involves passengers, domestic goods carriage, maritime cargo, or international air transport.

For example, international carriage cases may be governed by treaty-based limitation periods, which differ from the Civil Code.

XXII. Prescription in Corporate and Commercial Disputes

Corporate disputes do not have one universal prescriptive period. The period depends on the cause of action:

intra-corporate controversy,
collection,
derivative suit,
securities violation,
breach of fiduciary duty,
enforcement of subscription,
accounting and inspection rights,
or fraud.

Some claims are governed by the Corporation Code / Revised Corporation Code or securities laws; others default to Civil Code principles.

XXIII. Prescription in Family and Succession Law

Family and succession cases often involve special rules.

A. Declaration of nullity of marriage

This is not treated as an ordinary civil action subject to common prescriptive periods.

B. Annulment of marriage

Grounds and filing periods are governed by the Family Code and related statutes.

C. Action to impugn legitimacy, claim support, partition inheritance, or enforce hereditary rights

Each has its own rules, and some are imprescriptible or governed by special periods.

D. Partition

An action for partition among co-heirs or co-owners may be imprescriptible so long as co-ownership is recognized and has not been repudiated.

Again, possession and repudiation are often decisive.

XXIV. Prescription in Actions Involving Public Officers and the State

A. Claims against the State

The State cannot be sued without its consent. Even when consent exists, special procedures and periods may apply.

B. Recovery of public property

Property of public dominion is generally not subject to prescription.

C. Actions involving public officers

Administrative, civil, and criminal liabilities may each have different prescriptive periods under special laws.

XXV. Imprescriptible Actions

Not all actions prescribe.

Examples often include:

actions to declare a contract void,
actions to declare nullity where the law so treats the cause,
actions to quiet title when the plaintiff is in possession under circumstances recognized by law,
partition among co-owners before repudiation,
actions involving property of public dominion,
some status-related actions.

But “imprescriptible” must never be assumed casually. Very often, the principal declaration may be imprescriptible while related recovery or damages claims are not.

XXVI. How to Compute the Prescriptive Period

In computing prescription:

1. Identify the exact cause of action

Not the remedy, not the title of the complaint.

2. Determine when the cause accrued

This is the reckoning point.

3. Determine whether a special law applies

Special law overrides general Civil Code rules.

4. Check for interruption

court filing,
written demand,
written acknowledgment,
statutory interruption rules.

5. Check for suspension

minority,
marriage,
guardianship,
trust relation,
other statutory grounds.

6. Count calendar time carefully

Issues of leap years, last-day filing, holidays, and filing methods may matter procedurally.

XXVII. Procedural Aspect: Prescription as a Defense

Prescription is usually raised as an affirmative defense or ground for dismissal where evident from the complaint and its annexes.

Important procedural points

If the complaint itself shows the claim is time-barred, dismissal may be proper.
If the issue depends on disputed facts, trial may be needed.
Prescription can be waived if not timely raised in certain contexts.
In some areas, especially tax or special statutory claims, the court may take a stricter stance because the period is jurisdictional.

XXVIII. Burden of Proof

The party invoking prescription bears the burden of showing that:

the action accrued on a certain date,
the applicable period is a particular number of years,
and the suit was filed beyond that period.

If interruption or suspension is claimed, the party relying on it must prove the facts that support it.

XXIX. Frequent Philippine Problem Areas

1. Confusing written and oral contracts

A receipt, text exchange, ledger entry, or email may or may not amount to the written contract sued upon.

2. Confusing quasi-delict with breach of contract

This changes the period.

3. Assuming land cases never prescribe

Many do.

4. Assuming registered title automatically defeats all actions

Not always. Fraud, trust, possession, and reconveyance doctrines complicate matters.

5. Ignoring interruption by written demand

Demand letters can materially affect computation.

6. Treating every declaration of nullity as imprescriptible in all respects

The declaration may be imprescriptible while ancillary relief may not be.

7. Forgetting special laws

Labor, tax, insurance, transportation, and criminal matters often do not follow the default Civil Code periods.

8. Counting from the wrong date

The wrong reckoning point is the most common prescription error.

XXX. Condensed Reference Guide

Below is a practical summary of common Philippine prescriptive periods:

10 years
- written contracts
- obligations created by law
- judgments
- mortgages
6 years
- oral contracts
- quasi-contracts
4 years
- injury to rights
- quasi-delicts
- annulment of voidable contracts
- rescission in many rescissible-contract settings
- fraud-based civil actions, depending on the exact theory
1 year
- forcible entry
- unlawful detainer
- certain summary possessory actions
30 years
- real actions over immovables, subject to title and special-property doctrines
3 years
- many labor money claims
4 years
- illegal dismissal

These are only starting points. The exact cause of action and special law still control.

XXXI. Leading Analytical Framework for Any Philippine Prescription Question

A reliable method is this:

Step 1: What exactly is being sued on? Step 2: What law governs that right? Civil Code or special law? Step 3: When did the cause of action accrue? Step 4: Was there any demand, acknowledgment, filing, or statutory tolling? Step 5: Is the action personal, real, contractual, tort-based, statutory, criminal, or administrative? Step 6: Is the action imprescriptible, or is only one aspect of it imprescriptible? Step 7: Are there procedural deadlines distinct from prescription?

That framework prevents most mistakes.

XXXII. Final Observations in Philippine Context

Prescription in the Philippines is not a single rule but a network of rules spread across the Civil Code, procedural law, penal law, labor law, tax law, and numerous special statutes. The most important lessons are these:

First, identify the true cause of action. Second, look for a special law before defaulting to the Civil Code. Third, determine the exact accrual date. Fourth, check interruption, suspension, possession, title status, trust relation, and disability. Fifth, do not assume that because a right is morally strong, it remains legally enforceable forever.

In Philippine litigation, prescription can completely defeat an action before the merits are even reached. For that reason, it is one of the first issues that should be analyzed in any complaint, answer, legal opinion, demand letter, or case strategy memo.

Appendix: High-Value Doctrinal Reminders

The running of prescription usually begins when the cause of action accrues, not when the plaintiff becomes fully prepared to sue.
A written extrajudicial demand may interrupt prescription.
A written acknowledgment by the debtor may also interrupt prescription.
Possession matters greatly in land and title cases.
Co-ownership blocks prescription until repudiation is clearly shown.
Void contracts generally cannot ripen into validity through time.
Labor and tax cases often follow special statutory deadlines, not general civil periods.
In criminal law, distinguish prescription of the crime from prescription of the penalty.
In judgment enforcement, distinguish execution by motion from revival by action.
Laches is not identical to prescription, though both concern delay.

This subject is foundational because timing is often as decisive as substance in Philippine law.