How a Contract Is Formed: Offer, Acceptance and Consent
Short answer: Under the Philippine Civil Code, most contracts are formed the moment a definite offer meets an absolute acceptance on the object and the cause (Articles 1315 and 1319). No signature or notarization is usually needed for the contract to exist. But the consent must come from a capable person and be free of mistake, violence, intimidation, undue influence and fraud, or the contract can be annulled.
This guide walks through formation step by step: when an offer is real, when acceptance binds, when an offer can still be withdrawn, and what makes consent defective. If you only need the checklist of the three essential requisites (consent, object and cause), start with our guide on what makes a contract valid in the Philippines.
What are the stages of a contract under Philippine law?
It helps to see a contract as a timeline. Article 1305 defines a contract as “a meeting of minds between two persons whereby one binds himself, with respect to the other, to give something or to render some service.” The key question in most disputes is when that meeting of minds happened, because before that moment either side can walk away, and after it both are bound.
| Stage | What happens | Are the parties bound? |
|---|---|---|
| Negotiation | Inquiries, price quotes, advertisements, counter-proposals | No. Either side may still withdraw. |
| Perfection | A certain offer meets an absolute acceptance (Art. 1319) | Yes. The contract exists from this moment (Art. 1315). |
| Consummation | Each side performs: delivery, payment, service | Yes. Failure to perform becomes breach. |
Article 1315 states the general rule: “Contracts are perfected by mere consent.” From that moment the parties are bound not only to what they expressly agreed on but also to all consequences that, by the contract’s nature, follow from good faith, usage and law. Article 1475 applies the same rule to sales: a sale is perfected once there is a meeting of minds on the thing and the price.
There is one important exception. Real contracts — deposit, pledge and commodatum (loan for use) — are not perfected until the object is delivered (Article 1316). Agreeing to lend your car is not yet a commodatum; handing over the keys is.
When is an offer a real offer?
Article 1319 requires that “the offer must be certain.” An offer is certain when the other party can accept it with a simple “yes” and nothing essential is left to be agreed on later. A message saying “I’ll sell you my lot in Batangas for ₱1,500,000 cash, transfer taxes on you” is an offer. “Interested in buying my lot? Let’s talk price” is not.
Two common situations are not offers unless the circumstances show otherwise:
- Business advertisements of things for sale are mere invitations to make an offer (Article 1325). A store’s posted price or an online listing invites you to offer; the seller may still decline.
- Advertisements for bidders are invitations to make proposals. The advertiser is not bound to accept the highest or lowest bid unless the contrary appears (Article 1326).
An offer also dies if either party dies, suffers civil interdiction, becomes insane or becomes insolvent before acceptance is conveyed (Article 1323).
When does acceptance create a binding contract?
Acceptance must be absolute. Under Article 1319, “a qualified acceptance constitutes a counter-offer.” If the seller offers ₱1,500,000 and you reply “Okay, but ₱1,400,000,” there is no contract — you have made a new offer that the seller is free to accept or reject.
| Rule on acceptance | What it means in practice | Civil Code basis |
|---|---|---|
| Must be absolute | Any change to the terms is a counter-offer, not acceptance | Art. 1319 |
| May be express or implied | Paying, delivering or starting work can show acceptance | Art. 1320 |
| Offeror may set terms | If the offer fixes the time, place or manner of acceptance, you must follow it | Art. 1321 |
| Acceptance by letter or telegram | Binds the offeror only from the time it comes to their knowledge | Art. 1319 |
| Offer made through an agent | Accepted once acceptance is communicated to the agent | Art. 1322 |
For contracts by letter, Article 1319 adds that the contract is presumed made in the place where the offer was made. That can matter later when deciding venue for a case.
Can a contract be formed by text, chat or email?
Yes. Section 16 of the Electronic Commerce Act (RA 8792) provides that an offer, its acceptance and the other elements of a contract may be expressed and proved by electronic data messages or electronic documents, and no contract is denied validity or enforceability solely because it is in electronic form. Section 17 adds that, between the parties, a declaration of will is not denied legal effect just because it is electronic. A “Deal, I’ll take it” reply on Messenger can therefore be an acceptance. The harder questions are usually proof and form: whether the message really came from the other party, and whether the particular contract must be in writing to be enforced. See our guide on which contracts need a writing under the Statute of Frauds.
Can the person who made the offer still withdraw it?
Generally, yes — until acceptance. Under Article 1324, even if the offeror gave you a period to decide (“you have until Friday”), the offer may be withdrawn at any time before acceptance by communicating the withdrawal. The exception is an option founded on a consideration, “as something paid or promised.”
Article 1479 applies this to sales: an accepted unilateral promise to buy or sell a determinate thing for a price certain binds the promisor only if it is supported by a consideration distinct from the price. That separate payment is usually called option money. If you want to “reserve” a property while you decide, pay for the option and put it in writing; otherwise the seller may lawfully sell to someone else before you accept. Our guide on earnest money vs down payment vs option money explains the difference.
Who cannot give valid consent?
Article 1327 lists persons who cannot give consent: unemancipated minors, and insane or demented persons and deaf-mutes who do not know how to write. Article 1328 adds that contracts made during a lucid interval are valid, while those agreed to while drunk or under a hypnotic spell are voidable. Article 1329 says these incapacities are subject to modifications and special disqualifications set by law, so check current rules for the specific person. Our guide on who has limited capacity to enter into contracts covers this in more detail.
Authority matters too. Under Article 1317, no one may contract in another person’s name without authority or legal representation. A contract signed by someone without authority, or beyond their powers, is unenforceable unless the person represented ratifies it before the other party revokes it.
What makes consent defective?
Under Article 1330, consent given through mistake, violence, intimidation, undue influence or fraud makes the contract voidable. A voidable contract is binding until a court annuls it, and it can be ratified (Article 1390).
| Defect | When it vitiates consent | What does not count |
|---|---|---|
| Mistake (Arts. 1331–1334) | It concerns the substance of the object or the conditions that principally moved a party to contract | A simple mistake of account (only corrected); a risk the party knew about |
| Violence (Art. 1335) | Serious or irresistible force is used to wrest consent | Not applicable |
| Intimidation (Art. 1335) | Reasonable, well-grounded fear of an imminent and grave evil to person, property or close family | A threat to enforce a just or legal claim through proper authorities |
| Undue influence (Art. 1337) | Improper advantage of power over another’s will, removing reasonable freedom of choice | Ordinary persuasion that leaves free choice intact |
| Fraud (Arts. 1338–1344) | Insidious words or machinations induced a contract the party would not otherwise have made | Usual trade exaggerations; mere opinion (unless from a relied-on expert); incidental fraud (damages only) |
A few details often decide cases:
- Language and literacy. If a party cannot read, or the contract is in a language they do not understand, and mistake or fraud is alleged, the party enforcing the contract must show that the terms were fully explained (Article 1332).
- Third parties. Violence or intimidation annuls the obligation even if a third person used it (Article 1336). But misrepresentation by a third person does not vitiate consent unless it created a substantial mutual mistake (Article 1342).
- Silence. Failing to disclose facts is fraud only when there is a duty to reveal them, as in confidential relations (Article 1339).
- Serious vs incidental fraud. Fraud must be serious to annul a contract; incidental fraud only makes the person who used it liable for damages (Article 1344).
- Low price alone. Inadequacy of cause does not invalidate a contract unless there was fraud, mistake or undue influence, except where the law provides otherwise (Article 1355).
Simulated contracts are a separate problem. An absolutely simulated contract — where the parties never intended to be bound — is void. A relatively simulated one binds the parties to their real agreement if it does not prejudice third persons and is not for an unlawful purpose (Articles 1345–1346). For how void, voidable and unenforceable contracts differ in effect, see void vs voidable vs unenforceable contracts.
Was a contract formed? A quick checklist
- Find the offer. Was it definite enough to accept with a “yes,” or only an advertisement or invitation?
- Find the acceptance. Was it absolute, or did it change any term (a counter-offer)?
- Check timing. Did acceptance reach the offeror before any withdrawal, death, insanity or insolvency?
- Check form of acceptance. Did the offer require a specific time, place or manner, and was it followed?
- Check the type of contract. Is it a real contract (deposit, pledge, commodatum) that needs delivery?
- Check capacity and authority of each person who agreed or signed.
- Check for vices of consent: mistake, violence, intimidation, undue influence or fraud.
- Check form for enforceability. Does the law require a writing or a public document for this contract?
Your options and what to do next
What you should do depends on which side of the formation question you are on.
If you believe a contract was formed and the other side backed out
- Gather proof of the offer and acceptance: messages, emails, quotations, purchase orders, receipts, proof of payment and any partial performance. Export chats with dates and the sender’s account details visible.
- Send a written demand stating the agreed terms, the date of acceptance and what you want done (perform, refund or pay damages). See when a demand letter is required.
- Go to the barangay first if both parties are individuals living in the same city or municipality, as the Katarungang Pambarangay provisions of the Local Government Code (RA 7160) generally require conciliation before filing in court, subject to exceptions (Secs. 408 and 412). File the complaint with the punong barangay where the respondent lives (Sec. 409) and bring your demand letter and proof of the agreement.
- File in court if settlement fails. For a pure money claim, small claims may be available; otherwise file an ordinary civil action for specific performance or damages. Compare the routes in small claims vs regular civil action.
If you say no contract was formed
- Identify the exact message the other side calls “acceptance” and check whether it changed any term (counter-offer) or arrived after you withdrew the offer.
- Keep proof of when you communicated any withdrawal.
- Reply to any demand in writing, stating briefly why no meeting of minds occurred. Avoid acts that could be read as implied acceptance, such as accepting payment or starting delivery.
If you agreed, but your consent was defective
- Act within four years. The action for annulment must be brought within four years (Article 1391), counted from when intimidation, violence or undue influence ceases, or from discovery of the mistake or fraud. For minors or other incapacitated persons, it runs from when guardianship ceases.
- Do not ratify by accident. Once the defect has ceased and you know of it, acts that imply waiver — such as continuing to perform or accepting benefits — can count as tacit ratification, which extinguishes the action (Articles 1392–1393).
- Preserve evidence of the defect: messages showing threats or pressure, false representations, proof you could not read or understand the document, medical or other records of incapacity, and witnesses.
- Expect mutual restitution. If the contract is annulled, the parties return what they received, with fruits and interest, except as the law provides (Article 1398).
- File the annulment action in the proper court (barangay conciliation first if it applies). If you cannot afford a lawyer, ask the Public Attorney’s Office whether you qualify for free assistance.
First action today: write a one-page timeline — offer, any counter-offers, acceptance, withdrawal and payments, each with its date and the document that proves it. Almost every formation dispute turns on that timeline.
Key takeaways
- Most contracts are perfected by consent alone; real contracts need delivery.
- An offer must be certain; ads and calls for bids are only invitations.
- Acceptance must be absolute; any change is a counter-offer.
- An offer can be withdrawn before acceptance unless an option was paid for.
- Chat and email can form a contract under RA 8792, but proof and required form still matter.
- Defective consent makes a contract voidable, with a four-year window to annul.
Frequently asked questions
Is a contract binding even if it was never signed?
Often, yes. Article 1356 makes contracts obligatory in whatever form they are entered into, as long as the essential requisites are present. A signature or written form is required only when the law demands it for validity, enforceability or proof. See whether oral agreements are legally binding.
If I reply “okay, but…” is that an acceptance?
No. A qualified acceptance is a counter-offer under Article 1319. The original offer is rejected and no contract exists unless the other side accepts your new terms.
Can a seller back out after giving me until Friday to decide?
Yes, if you have not yet accepted and you did not pay or promise anything for the option. Article 1324 lets the offeror withdraw before acceptance by communicating the withdrawal, unless the option is founded on a consideration.
Is a contract signed under pressure automatically void?
No. Violence or intimidation makes it voidable, not void. It stays binding until annulled by a court, and the action must be filed within four years from when the intimidation or violence ceased (Articles 1390–1391).
Sources
- Civil Code of the Philippines (RA 386), Articles 1305, 1315–1346, 1355–1356, 1390–1398, 1475 and 1479 — LawPhil
- Electronic Commerce Act of 2000 (RA 8792), Sections 16–17 — LawPhil
- Local Government Code of 1991 (RA 7160), Secs. 408, 409 and 412 (Katarungang Pambarangay) — LawPhil
- Public Attorney’s Office
Sources rechecked as of: October 4, 2026
This article is general legal information, not legal advice. For advice on your situation, consult a lawyer or the Public Attorney’s Office.