What Makes a Contract Valid in the Philippines?
Quick Answer: A contract is generally valid when the parties have legal capacity and give real consent, the agreement concerns a lawful and sufficiently determinate object, and it has a lawful cause. Article 1318 of the Civil Code identifies consent, object and cause as the essential requisites. Some transactions must also follow a required form to be valid, enforceable or effective against third persons.
A signature is powerful evidence, but it does not cure illegality, incapacity, fraud, mistake, intimidation or the absence of a real agreement. Start with the document, then test how it was formed and what the law requires for that transaction. To run that test step by step and reach a verdict, use the contract review checklist.
The Three Essential Requisites
| Requirement | Question to ask | Common defect |
|---|---|---|
| Consent | Did capable parties freely agree on the same offer and acceptance? | Mistake, violence, intimidation, undue influence or fraud |
| Object | Is the promised thing, service or right lawful, possible and determinate? | Illegal, impossible or outside commerce |
| Cause | What lawful reason supports each party’s undertaking? | No cause, false cause or unlawful cause |
Articles 1305, 1315 and 1318 of the Civil Code supply the starting rules. A contract is ordinarily perfected by consent, but real and formal contracts may require delivery or a prescribed form.
Does a Contract Have to Be Written?
Not always. Article 1356 of Book Four of the Civil Code states the general rule that contracts are obligatory in whatever form they are entered into, provided all essential requisites exist. But form matters where the law requires it for validity, enforceability or effectiveness against third persons. Read the separate guide on oral agreements and the Statute of Frauds.
Validity Decision Table
| Situation | Likely issue | Next check |
|---|---|---|
| Both parties signed and performed | Generally binding | Legality, capacity and exact obligations |
| Agreement was only oral | May still be valid | Required form and whether it remains executory |
| Signature obtained through fraud or intimidation | Consent may be voidable | Evidence and prescriptive period |
| Object or purpose is illegal | Possible absolute nullity | Articles 1409–1412 and consequences |
| Agent signed for another person | Authority problem | Written authority, ratification and transaction type |
Evidence to Preserve
- The signed contract, annexes and every amendment
- Offers, quotations, purchase orders and acceptance messages
- Proof of identity, capacity and authority to sign
- Receipts, bank transfers, delivery records and performance reports
- Messages showing negotiations, representations or pressure
- Notarial records or registry documents where applicable
What If One Requirement Is Defective?
The result is not automatically the same. A defect may make the agreement void, voidable, rescissible or unenforceable. Those classifications have different effects, parties, defenses and deadlines. Use the comparison guide on void, voidable and unenforceable contracts before deciding whether to perform, ratify or challenge the agreement.
Practical Next Steps
- Identify the exact agreement and every incorporated document.
- List what each party promised and the due dates.
- Test consent, object, cause, capacity, authority and required form separately.
- Record what has already been performed or accepted.
- Check whether the real dispute concerns validity or a later breach of a valid contract.
- Before stopping performance or filing, obtain advice on the correct remedy and deadline.
Capacity check: A valid agreement also requires a party capable of giving legally effective consent. See juridical capacity versus capacity to act and the guide to limited contractual capacity.
Related: For when an offer and acceptance actually create a binding contract — counter-offers, withdrawing an offer, option money and defects of consent — see how a contract is formed: offer, acceptance and consent.
Frequently Asked Questions
Is a notarized contract automatically valid?
No. Notarization strengthens authenticity and may satisfy a formal requirement, but it does not cure an illegal object, absent consent or another substantive defect.
Can text messages form a contract?
Potentially. The messages must establish the agreement and satisfy applicable rules on electronic evidence and any special form requirement.
Can a minor sign a binding contract?
Capacity rules and statutory exceptions must be examined. A capacity defect can affect enforceability or make the agreement voidable.
Does payment prove a contract?
Payment can strongly support the existence and partial performance of an agreement, but the complete terms and legal validity still require proof.
Browse the Obligations and Contracts hub for the connected validity, performance and remedies guides.
If the Other Party Does Not Perform
Once a valid contract exists, the next question is what remedy fits the breach. Start with whether non-performance can justify cancelling the contract, then review Article 1191 resolution and specific performance vs resolution. Related next-step guides cover whether demand is required, recovery of a down payment, attorney’s fees, and the filing deadline.
For sale-specific agreements, compare a contract of sale with a contract to sell and review when a contract to sell may be cancelled.
Primary Legal Sources
- Civil Code of the Philippines, Republic Act No. 386 — LawPhil
- Civil Code of the Philippines — Supreme Court E-Library
Legal verification date: September 15, 2026. This is general legal information, not advice for a particular dispute.