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Sreeram Viswanath

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Published on: Jun 24, 2026

Types Of Contract

The Indian Contract Act classifies a contract on the basis of various criterion, the likes of which is covered in this article. A contract, in general, is a written or spoken agreement which particularly deals with employment, sales or tenancy that is enforceable by law. In this article, we look at the different Types Of Contract under the Indian Contracts Act.

Basis of Classification

A contract is classified on the basis of the following:

  • Formation
  • Nature of Consideration
  • Execution
  • Validity

On the Basis of Formation

  1. Express Contract
  2. Implied Contract
  3. Quasi Contract
  4. E-Contract

Express Contract

A contract is said to be “Express” if the proposal or acceptance of any promise is made in words, be it in the written or oral form. The provision is subject to the condition that the offer so made gains the acceptance of the acceptor.

Implied Contract

An implied contract is in stark contrast to an express contract, i.e. it isn’t expressed in written or oral form.

Quasi Contract

Quasi Contracts, unlike others, hold no contractual relations between the partners but are created by virtue of law. The court may form a Quasi-Contract under any of the following circumstances:

  • Upon the supply of essentials
  • Where the expenses of one person are met by another.
  • Where one party gains by the activity of another.
  • In the case of the finder of lost tools.
  • Upon mistaken payments/supply of goods

E-Contract

Electronic, Cyber or Electronic Data Interchange contracts are formed by electronic means. The means and devices that aid in such formation include email, telephone, digital signatures, and the likes of it. The contractual terms here are listed by electronic means or implied by the actions of the users.

On the Basis of Consideration

  1. Bilateral Contract
  2. Unilateral Contract

Bilateral Contract

A contract is called bilateral, or in other words reciprocal, when it comes with mutual considerations. It is formed when two parties agree to the contractual terms of each other.

Unilateral Contract

A contract is classed as unilateral where only one party makes a promise, which could be availed by anyone who is ready to be committed to the same. Such a contract can only be fulfilled if someone else fulfils the promise.

On the Basis of Execution

  1. Executed Contract
  2. Executory Contract

Executed Contract

A contract is termed as executed if the performance stipulated under it has been completed by one, both or all parties. Most of these contracts are performed instantaneously, such as buying of goods and/or services.

Executory Contract

An executory contract involves the performance of consideration at a future point of time; which means the promises of consideration cannot be completed instantaneously as in an executed contract.

On the Basis of Validity

  1. Valid Contract
  2. Void Contract
  3. Voidable Contract
  4. Illegal Contract
  5. Unenforceable Contract

Valid Contract

Valid contracts must satisfy all the

contract requirements, making it legally binding and enforceable. These requirements include:
  • The making of offer and its acceptance, making it eligible for registration.
  • The existence of a legal relationship.
  • The existence of a lawful consideration and object.
  • The parties concerned are competent to form a contract.
  • Free consent of the parties.
  • Certainty in the terms of the contract.
  • The capability of performance (of the contract).
  • The contract hasn’t been expressly declared void under the contract laws.

Void Contract

Any contract which is not in line with the contract requirements as highlighted above is classified as void.

Voidable Contract

A contract is considered as voidable on the existence of an agreement which is enforceable by law at the option of one or more of the parties concerned, but not at the option of the others. In simple terms, at least one of the parties to the contract must be bound to the terms specified in it. The other party, who could be a minor or is temporarily incapable of a contract owing to other reasons, isn’t bound by it and may repudiate or accept the terms of the contract. If the latter chooses to repudiate, the contract becomes void.

Illegal Contract

A contract is termed illegal by the court if:

  • It allows one or all the parties to break the law or not adhere to society’s norms.
  • It is opposed to public policy.

All illegal contracts can be void/voidable/valid, but it cannot be the other way around. For example, party X may have a contract to sell narcotics to party Y, and the contract may be on par with the essentials. Such a contract is valid on the basis of these essentials but is otherwise illegal and non-enforceable by law. Parties in default of these contracts are legally punishable.

Unenforceable Contract

A contract is unenforceable if it fails to complete the required legal obligations. Such a contract can be enforced upon completing these formalities, the likes of which mostly occur in the form of technical defects.
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Frequently Asked Questions

Common questions about Types of Contracts Under Indian Contract Act.

A contract is a legally binding agreement between two or more parties, which can be written or spoken, and deals with matters such as employment, sales, or tenancy.
Contracts can be classified based on formation, nature of consideration, execution, and validity, as outlined in the article.
An express contract is one where the proposal or acceptance of any promise is made in words, either written or oral, subject to the condition that the offer is accepted by the other party.
Unlike an express contract, which is expressed in written or oral form, an implied contract is not explicitly stated but is inferred from the actions or conduct of the parties involved.
A quasi-contract is a legal obligation created by law, not by an agreement between parties. It may arise in circumstances such as the supply of essentials, where one person's expenses are met by another, or when one party gains from the activities of another.
A bilateral contract involves mutual promises or considerations from both parties, while a unilateral contract involves only one party making a promise that can be accepted by anyone willing to fulfill the promise.
An executed contract is one where the performance stipulated under the contract has been completed by one or all parties, often instantaneously. An executory contract, on the other hand, involves the performance of consideration at a future point in time.
For a contract to be valid, it must meet certain requirements, such as the existence of an offer and acceptance, a legal relationship, lawful consideration and object, competent parties, free consent, certainty of terms, capability of performance, and not being expressly declared void under contract laws.
An illegal contract is one that allows one or more parties to break the law or violate public policy. Such contracts are non-enforceable by law, and parties involved may face legal punishment.
An unenforceable contract is one that fails to complete the required legal obligations but can become enforceable upon completing those formalities. Unlike illegal contracts, unenforceable contracts are not inherently against the law but may have technical defects preventing their enforceability.