Signing a contract does not always mean you are bound by it forever. The Civil Transactions Law recognizes that a contracting party's will may be "defective" at the time of signing — they may sign under the influence of a fundamental mistake, deception, threat, or exploitation of their weakness. In these cases, the law grants you the right to seek annulment of the contract. But each case has its own conditions and time limits. Here is a practical guide explaining when a contract is validly concluded, and when it becomes voidable.
First: how is a contract concluded at all?
A contract arises from the linking of an offer to an acceptance to produce a legal effect. Consent is achieved if the wills of two contracting parties having capacity to contract concur, and the will is expressed in a manner indicating it — by word, writing, an understood gesture, or actual dealing.
For a contract to be validly concluded, three elements must exist: consent (a sound will), subject matter (which must be possible, determined, and not contrary to public order), and cause (the legitimate motive for contracting).
The subject-matter elements: when is the contract void?
The contract is void (which is more severe than voidable) if a condition of the subject matter is lacking: that the subject matter be possible in itself, not contrary to public order, and determined or determinable. Likewise, any contract whose driving cause is unlawful is void if it is stated or indicated by the circumstances.
The distinction between voidness and voidability is fundamental: a void contract produces no effect at all and any interested party may invoke it, whereas a voidable contract is valid and produces its effect until the holder of the right seeks its annulment.
The four defects of consent
Here lies the core of the matter — the cases that render a contract voidable due to a flaw in the contracting party's will:
1. Fundamental mistake
A contracting party may seek annulment if they fell into a fundamental mistake without which they would not have consented — especially regarding the quality of the subject matter, the identity of the other party, or the legal ruling. But on condition: a mistake is not given weight unless the other party fell into the same mistake, knew of it, or could easily have detected it. A material mistake in calculation or writing does not affect the contract; it is merely corrected.
2. Deceit (fraudulent misrepresentation)
Deceit is for one party to deceive the other by fraudulent means leading them to conclude a contract they would not have concluded otherwise. Importantly: deliberate silence to conceal a fundamental matter is also deemed deceit. The deceived party may seek annulment if the deceit concerned a fundamental matter.
3. Duress
Duress is the unlawful threatening of a person by a material or moral means that frightens them into acting. It is established if the threat is of grave, imminent danger to the life, honor, or property of the coerced party, or is directed at another. The person's age and their social and health condition are considered in assessing duress.
4. Exploitation (gross lesion coupled with exploitation)
If one party exploits an apparent weakness or a pressing need in the other to conclude a contract from which the latter suffers lesion, the court may reduce the latter's obligations, increase the other party's obligations, or annul the contract.
Watch the deadline — this is the most important practical point
In the case of exploitation, the claim must be filed within 180 days from the date of contracting, otherwise it will not be heard. In the other defects of consent, an annulment claim is not heard after one year from the date of becoming aware of the ground for annulment (or from the cessation of duress / attainment of capacity), and in all cases after ten years from contracting. Delay may lose your right to annul even if the defect is established.
An important note on the down payment (arboun)
Paying a down payment upon concluding the contract indicates — unless otherwise agreed — that the payer alone has the right to withdraw from the contract, and if they withdraw they do not recover the down payment. So if you intend the down payment to be "earnest" rather than a "right of withdrawal," state this expressly in the contract.
What happens after annulment?
In both annulment and voidness, the parties return to the state they were in before contracting, and if that is impossible, compensation may be ordered. The right of annulment also lapses by ratification, express or implied, from the person entitled to it.
Conclusion
Not every signed contract is bulletproof, and not every error in contracting justifies annulment. The standard is precise: was the defect fundamental, such that without it you would not have consented? And did you act in time? The golden rule: if you feel you signed a contract under the influence of deception, pressure, or a fundamental erroneous piece of information, do not wait — consult a specialist immediately, because the short periods may close the door on you quickly.
How does LEXIUM help?
We analyze the circumstances of your contract's conclusion and determine whether there is a defect of consent justifying annulment, assess the strength of your position and the time available, and take the appropriate action — whether to seek annulment or to defend against an unjustified annulment claim.
Disclaimer: This article is for general informational purposes only and does not constitute legal advice. See our full disclaimer.