Void and voidable contracts are two different concepts in Hong Kong law that can have significant implications for your business and personal transactions. In this post, you will learn the key differences between them, how to identify them, and what to do if you encounter them. Read on to find out more.
Contracts are essential for any business transaction, as they define the rights and obligations of the parties involved. However, not all contracts are valid and enforceable in the eyes of the law.
Some contracts may be void or voidable, depending on the circumstances and the nature of the agreement.
In this blog post, we will explain the key differences between void and voidable contracts in Hong Kong law, and why it is important to distinguish between them.

Understanding the Basics
Before we dive into the details, let us first understand what are void and voidable contracts, and how they differ from each other.
A void contract is a contract that is null and void from the beginning, meaning that it has no legal effect and cannot be enforced by either party.
A void contract is invalid because it violates a fundamental principle of law, such as public policy, morality, or statutory provisions.
For example, a contract to commit a crime or a contract that is contrary to the Basic Law of Hong Kong is void.
A voidable contract is a contract that is valid and enforceable, unless one of the parties chooses to rescind or cancel it. A voidable contract is defective because it suffers from a flaw or defect that affects the consent or free will of one of the parties.
For example, a contract that is induced by fraud, duress, or undue influence is voidable.
It is important to distinguish between void and voidable contracts because they have different legal consequences and implications for the parties involved.
Knowing whether a contract is void or voidable can help you protect your rights and interests, and avoid potential disputes or liabilities.
Void Contracts: When a Contract is Invalid
A contract may be void for various reasons, such as:
Lack of consensus and idem
This means that there is no mutual agreement or meeting of the minds between the parties on the essential terms of the contract.
For example, if the parties have a different understanding of the subject matter, price, or duration of the contract, there is no consensus ad idem and the contract is void.
Illegality
This means that the contract is illegal or unlawful, either in its purpose, object, or performance.
For example, a contract to smuggle drugs, bribe a public official, or evade taxes is illegal and void.
Incapacity
This means that one of the parties lacks the legal capacity or ability to enter into a contract.
For example, a contract with a minor, a mentally incapacitated person, or a bankrupt person may be void, unless it is for their benefit or necessity.

Void Contracts: What Happens Next?
A void contract has the following effects:
Deemed not legally binding
A void contract is treated as if it never existed and has no legal force or effect. The parties are not bound by the terms of the contract and have no rights or obligations under it.
No enforceability in court
A void contract cannot be enforced by either party in a court of law. The court will not recognize or uphold the contract, and will not grant any remedy or relief to the parties.
Money can be reclaimed
If any money or property has been exchanged or transferred under a void contract, the parties can reclaim it under the principle of restitution. The parties are entitled to be restored to their original position before the contract was made.

Voidable Contracts: When a Contract is Defective
A contract may be voidable for various reasons, such as:
Misrepresentation
This means that one of the parties makes a false or misleading statement of fact that induces the other party to enter into the contract.
For example, if a seller lies about the quality, condition, or features of a product, the buyer may be entitled to rescind the contract.
Duress
This means that one of the parties uses or threatens to use physical or psychological force or pressure to compel the other party to enter into the contract.
For example, if a creditor threatens to harm a debtor or his family, unless he signs a contract to repay the debt, the contract may be voidable by the debtor.
Undue influence
This means that one of the parties uses or exploits a position of trust, confidence, or authority to influence or persuade the other party to enter into the contract.
For example, if a lawyer, doctor, or teacher takes advantage of their professional relationship with a client, patient, or student, and convinces them to sign a contract that is unfavorable to them, the contract may be voidable by the victim.
Voidable Contracts: What Happens Next?
A voidable contract has the following effects:
Can be ratified or affirmed
A voidable contract is valid and enforceable, unless the aggrieved party chooses to rescind or cancel it. The aggrieved party has the option to either ratify or affirm the contract, or to avoid or rescind the contract.
Ratification or affirmation means that the party accepts the contract and waives the right to rescind it. Avoidance or rescission means that the party rejects the contract and terminates the contractual relationship.
Innocent third parties may hold rights
If a voidable contract involves a third party who is innocent and unaware of the defect or flaw in the contract, the third party may acquire rights or interests under the contract that cannot be affected by the rescission of the contract.
For example, if a buyer sells a product that he bought under a voidable contract to another buyer who is unaware of the defect, the second buyer may have a valid title to the product, even if the first buyer rescinds the contract with the seller.
Burden of proof on challenging party
A voidable contract is presumed to be valid and enforceable, unless the party who challenges the contract proves otherwise. The party who wants to rescind the contract has the burden of proof to show that the contract was induced by misrepresentation, duress, or undue influence.

Bringing it All Together
In conclusion, void and voidable contracts are different types of contracts that have different legal effects and implications.
A void contract is null and void from the beginning, and has no legal effect or enforceability. A voidable contract is valid and enforceable, unless the aggrieved party chooses to rescind or cancel it. Some of the key differences between them are:
- Void contracts are invalid because they violate a fundamental principle of law, such as public policy, morality, or statutory provisions. Voidable contracts are defective because they suffer from a flaw or defect that affects the consent or free will of one of the parties.
- Void contracts are deemed not legally binding, and money or property can be reclaimed under the principle of restitution. Voidable contracts can be ratified or affirmed, and innocent third parties may hold rights or interests under the contract.
- Void contracts cannot be enforced by either party in a court of law. Voidable contracts are presumed to be valid and enforceable, unless the party who challenges the contract proves otherwise.
To illustrate the differences between void and voidable contracts, here are some real examples from Hong Kong law:
- In the case of Chung Ping Kwan v Lam Island Development Co Ltd [1995] 2 HKLR 228, the Court of Appeal held that a contract for the sale of land was void, because it was contrary to the Land (Miscellaneous Provisions) Ordinance, which required the consent of the Director of Lands for such transactions. The court ordered the return of the deposit and the cancellation of the contract.
- In the case of Lau Tat Wai v Yip Lai Kuen Joey [2013] 2 HKLRD 1197, the Court of First Instance held that a contract for the sale of shares was voidable, because it was induced by fraudulent misrepresentation. The court allowed the plaintiff to rescind the contract and claim damages from the defendant.
- In the case of Cheng Wing Yiu v Wong Siu Yin CACV75/1990 18 April 1991, the Court of Appeal held that a contract for the sale of a flat was voidable, because it was induced by undue influence. The court allowed the plaintiff to rescind the contract and recover the property from the defendant.
Key Takeaways
Here are some key takeaways from this blog post:
- Void and voidable contracts are different types of contracts that have different legal effects and implications.
- A void contract is null and void from the beginning, and has no legal effect or enforceability. A voidable contract is valid and enforceable, unless the aggrieved party chooses to rescind or cancel it.
- A contract may be void if it violates a fundamental principle of law, such as public policy, morality, or statutory provisions. A contract may be voidable if it suffers from a flaw or defect that affects the consent or free will of one of the parties, such as misrepresentation, duress, or undue influence.
- A void contract is deemed not legally binding, and money or property can be reclaimed under the principle of restitution. A voidable contract can be ratified or affirmed, and innocent third parties may hold rights or interests under the contract.
- A void contract cannot be enforced by either party in a court of law. A voidable contract is presumed to be valid and enforceable, unless the party who challenges the contract proves otherwise.
- To distinguish between void and voidable contracts, you should look for the following signs:
- If the contract is illegal, immoral, or contrary to public policy, it is likely to be void.
- If the contract is based on a false or misleading statement, a threat or coercion, or an abuse of trust or authority, it is likely to be voidable.
- If the contract has no legal effect or enforceability, and money or property can be reclaimed, it is likely to be void.
- If the contract can be accepted or rejected by the aggrieved party, and innocent third parties may have rights or interests, it is likely to be voidable.
- If the contract cannot be enforced by either party in a court of law, it is likely to be void.
- If the contract is presumed to be valid and enforceable, unless the challenging party proves otherwise, it is likely to be voidable.
We hope that this blog post has helped you understand the key differences between void and voidable contracts in Hong Kong law. If you have any questions or comments, please feel free to leave them below. Thank you for reading!
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Disclaimer: This blog post is for general information only, not legal advice. The law of Hong Kong may change and I am not liable for any actions based on this blog post. Consult a lawyer before acting on this blog post.