Quick answer
Contents
- The classification framework
- Valid contract
- Void agreement
- Void contract
- Voidable contract
- Illegal and unlawful agreements
- Complete comparison
- Legal effects and remedies
- Collateral transactions
- How to classify a problem
- Worked problems
- Landmark cases
- Exam answer structure
- Frequently asked questions
- Sources and related notes
The classification framework
The labels valid, void, voidable and illegal answer different questions. Start with enforceability, then identify when the defect arose and what remedy follows.
Students often treat these words as interchangeable. They are not. Section 2(g) defines a void agreement, Section 2(i) defines a voidable contract and Section 2(j) explains when a contract becomes void. A valid contract follows from the requirements in Section 10. Illegality usually requires a separate inquiry into unlawful consideration or object under Section 23.
Is it enforceable now?
Valid contracts are enforceable. Void agreements and void contracts are not.
Who controls enforcement?
A voidable contract is enforceable at the option of the protected party.
When did the defect arise?
A void agreement is defective from inception. A void contract becomes unenforceable later.
Why is it unenforceable?
Illegality concerns an unlawful object or consideration, not every reason for invalidity.
Valid contract under Section 10
Section 2(h) calls an agreement enforceable by law a contract. Section 10 gives the central test: the parties must be competent, consent must be free, consideration and object must be lawful, and the agreement must not be expressly declared void. Any additional requirement of writing, witnesses or registration under another applicable law must also be satisfied.
Each party can ordinarily insist on performance and, after breach, seek the remedies allowed by contract and specific relief law. Calling an agreement valid does not guarantee one particular remedy. It confirms enforceability.
Example: A competent seller freely agrees to sell identified goods to a competent buyer for a lawful price. The terms are certain and no law requires an unmet formality. The agreement satisfies Section 10 and is a valid contract.
Void agreement under Section 2(g)
Section 2(g) states that an agreement not enforceable by law is void. It creates no contractual right to compel performance. The defect exists from the beginning, even if the parties believed that they had made an effective bargain.
Common examples include an agreement with a person incompetent to contract under Section 11, a bilateral mistake about an essential fact under Section 20, an agreement without consideration outside Section 25's exceptions, and agreements expressly declared void under Sections 26 to 30. An agreement to perform an act impossible in itself is also void under Section 56.
The law may refuse enforcement without prohibiting the transaction. A wagering agreement is the standard illustration under the central Act. Section 30 makes it void, while the Supreme Court in Gherulal Parakh held that it is not for that reason alone forbidden by law under Section 23. State gambling laws may alter the result for a particular transaction.
Void contract under Section 2(j)
A contract that ceases to be enforceable becomes void when enforceability ends. It was valid at formation, unlike a void agreement, but a later event removes the legal obligation to perform.
Section 56 supplies the clearest example. If an act becomes impossible or unlawful after the contract was made because of an event the promisor could not prevent, the contract becomes void at that point. A contingent contract can also become void when its specified event becomes impossible or fails within the fixed time.
Later impossibility
A validly hires a specific hall from B for a concert. Before the date, the hall is destroyed without either party's fault. If the hall was essential to the promised performance, the contract may become void rather than having been void from the beginning.
Voidable contract under Section 2(i)
A voidable contract is enforceable at the option of one or more parties, but not at the option of the other. The contract is not automatically erased. The party whose consent or statutory right was affected may affirm it or rescind it.
Section 19 makes a contract voidable where consent was caused by coercion, fraud or misrepresentation. Section 19A deals with undue influence. Section 55 may make the unperformed part voidable when a party misses an essential time for performance. The exact source of voidability determines who may avoid and on what terms.
The contract remains operative. The protected party can lose the practical ability to rescind by affirming the transaction after learning the facts, waiting beyond the applicable limitation period, or where restoration and third-party rights make rescission unavailable under the governing law.
Illegal and unlawful agreements under Section 23
The Contract Act does not separately define the expression "illegal agreement". The controlling statutory question is whether the consideration or object is unlawful under Section 23. It is unlawful when it is forbidden by law, would defeat a law if permitted, is fraudulent, involves or implies injury, or is regarded by the court as immoral or opposed to public policy.
An agreement with such an object or consideration is void. It may also attract a statutory penalty, but criminal punishment is not necessary in every Section 23 case. Section 24 further makes an agreement void where an inseparable part of a single consideration or object is unlawful. If the lawful promise is genuinely severable, its treatment depends on the structure of the bargain and applicable law.
First identify the object and consideration. Then match the facts to a specific limb of Section 23. Do not conclude that a bargain is illegal merely because it is unfair, unwise or ultimately unenforceable for another reason.
Valid, void, voidable and illegal agreements compared
| Point | Valid contract | Void agreement | Voidable contract | Illegal agreement |
|---|---|---|---|---|
| Enforceability | Enforceable by the parties. | Not enforceable from inception. | Enforceable until the protected party rescinds. | Not enforceable because object or consideration is unlawful. |
| Statutory base | Sections 2(h) and 10. | Section 2(g) and specific void-agreement provisions. | Section 2(i), commonly with Sections 19, 19A or 55. | Sections 23 and 24, with any prohibiting law. |
| Choice | Neither party may simply avoid without legal ground. | No party can enforce the bargain as a contract. | The protected party may affirm or avoid it. | Courts do not enforce the prohibited bargain. |
| Typical cause | All formation and legal requirements are met. | Incapacity, bilateral mistake, impossibility at inception or express statutory invalidity. | Defective free consent or another statutory right to rescind. | Forbidden, law-defeating, fraudulent, injurious, immoral or public-policy object. |
| Collateral effect | Normal legal effect. | Collateral dealings are not automatically invalid. | Third-party consequences depend on rescission, notice and governing law. | Connected transactions may also be tainted when they advance the illegality. |
| Restoration | Ordinary contractual remedies apply. | Section 65 may apply when the agreement is discovered void. | Section 64 applies after rescission. | Recovery is restricted and depends on the statute, knowledge and public policy. |
Legal effects, rescission and restitution
Section 64: rescission of a voidable contract
When the entitled party rescinds a voidable contract, the other party need not perform promises in which that party is the promisor. The rescinding party must, so far as possible, restore any benefit received from the other party. The rule prevents rescission from becoming a way to keep the bargain's benefits while rejecting its burdens.
Section 65: agreement discovered void or contract becoming void
A person who received an advantage must restore it, or compensate for it, when an agreement is discovered to be void or a contract later becomes void. The language is important. It does not say that every void transaction automatically creates restitution, and it should not be used to enforce a bargain that both parties knowingly made for an unlawful purpose.
| Situation | Primary provision | Practical consequence |
|---|---|---|
| Protected party rescinds a voidable contract | Section 64 | Future performance is discharged and benefits received by the rescinding party are restored so far as possible. |
| Parties later discover that their agreement was void | Section 65 | An advantage received under it must be returned or compensated for, subject to the legal context. |
| A valid contract later becomes impossible or unlawful | Sections 56 and 65 | Performance ends when the contract becomes void and received advantages may require restoration. |
| Both parties knowingly pursue an unlawful object | Section 23 and applicable law | The court will not enforce the illegal bargain; restitution depends on specific doctrine and policy, not Section 65 alone. |
Effect on collateral transactions
A collateral transaction is a connected but separate bargain, such as a loan or partnership arrangement made to support another transaction. The effect of the main bargain depends on why it is unenforceable.
If the main agreement is merely void, the collateral transaction is not automatically void. Gherulal Parakh illustrates the point: Section 30 made wagers void, but a collateral partnership was not unlawful merely because its business involved wagering. If another law forbids the activity, or the collateral bargain is designed to advance an unlawful object, the result can differ.
Every illegal agreement is void, but every void agreement is not illegal. That is why illegality can have a wider effect on connected transactions.
How to classify an agreement in a problem question
- Identify the agreement, consideration and object.
- Test Section 10: capacity, free consent, lawful consideration, lawful object and no express invalidity.
- Ask whether the defect existed at formation or arose later.
- If one party has an election, identify the source of voidability and the protected party.
- If Section 23 is alleged, name the precise unlawful limb instead of using a label alone.
- State the effect on performance, benefits already transferred and collateral dealings.
- Apply Section 64 or 65 only after fitting its exact conditions.
Worked problems
Minor's loan
A minor signs a loan and mortgage. The agreement is void from inception because the minor is not competent under Section 11. It is not merely voidable at the minor's option. A separate claim for necessaries may arise against the minor's property under Section 68 on the required facts.
Fraud about the asset's condition
A seller intentionally hides serious damage and induces the buyer to contract. Under Section 19, the contract is voidable at the buyer's option. The buyer may rescind, or in an appropriate case insist on performance and being placed in the position promised by the representation.
Later legal prohibition
A valid export contract is made, but a later binding prohibition makes the promised export unlawful without either party's fault. The contract may become void under Section 56. Benefits already received must then be tested under Section 65.
Payment to secure a public appointment
A promises money to B in return for obtaining a public appointment through influence. The object or consideration is unlawful under Section 23. The agreement is void for illegality, not merely because one party later refuses.
Landmark cases
Mohori Bibee v Dharmodas Ghose
(1903) LR 30 IA 114 (PC)
Rule:An agreement made by a minor was treated as void from inception because competence under Section 11 is essential. The case prevents the incorrect classification of a minor's agreement as merely voidable.
Gherulal Parakh v Mahadeodas Maiya
AIR 1959 SC 781; 1959 Supp (2) SCR 406
Rule: A wager is void under Section 30 but is not for that reason alone forbidden by law under Section 23. The collateral partnership in issue was therefore not automatically unlawful.
Read Supreme Court judgmentSatyabrata Ghose v Mugneeram Bangur & Co.
AIR 1954 SC 44; 1954 SCR 310
Rule: The doctrine of frustration in India is governed by Section 56. Impossibility is not limited to literal impossibility, but the supervening event must fundamentally affect the promised performance on the facts.
Read Supreme Court judgmentNingawwa v Byrappa Shiddappa Hireknrabar
AIR 1968 SC 956
Rule:Fraud as to a document's character can make the transaction void, while fraud as to its contents ordinarily makes it voidable. The case shows why the nature of the defective consent matters.
Read Supreme Court judgmentExam answer structure
- Define the relevant category with Section 2.
- State Section 10 if validity is in issue.
- Explain whether invalidity existed initially or arose later.
- Apply Sections 19 or 19A for voidability, or Section 23 for unlawfulness.
- State the legal effect on performance and collateral transactions.
- Apply Sections 64 and 65 separately to restoration.
- Add one case for the exact distinction and conclude on the facts.
Frequently asked questions
What is the difference between a void and voidable agreement?
A void agreement is not enforceable by law. A voidable contract remains enforceable unless the party whose consent or right was affected chooses to rescind it. Until rescission, the voidable contract continues to operate.
Is every void agreement illegal?
No. Every illegal agreement is void, but a void agreement is not necessarily illegal. For example, Section 30 makes a wagering agreement void, while Gherulal Parakh explains that it is not for that reason alone forbidden by law under Section 23.
What is the difference between a void agreement and a void contract?
A void agreement lacks enforceability from the beginning. Under Section 2(j), a void contract was enforceable when made but later ceases to be enforceable, such as when performance becomes impossible under Section 56.
When does Section 65 require restitution?
Section 65 applies when an agreement is discovered to be void or a contract becomes void and a person has received an advantage under it. The advantage must be restored or compensated for, but the provision should not be treated as a general recovery route for every known illegal bargain.
What happens after a voidable contract is rescinded?
Under Section 64, the other party need not perform promises in which that party is the promisor. The rescinding party must, so far as possible, restore any benefit received from the other party.
What is an unlawful agreement under Section 23?
An agreement has an unlawful object or consideration when it is forbidden by law, defeats a law, is fraudulent, involves injury, or is regarded by the court as immoral or opposed to public policy. Such an agreement is void.