A bilateral contract is a contract in which both parties make promises to each other. Each party is both a promisor and a promisee: one party promises to do something, and the other party promises to do something in return. The mutual exchange of promises is what gives a bilateral contract its name and what distinguishes it from a unilateral contract, where only one party makes a promise.
The vast majority of commercial contracts are bilateral contracts. A vendor agreement in which a supplier promises to deliver goods and a buyer promises to pay for them is a bilateral contract. An employment contract in which an employee promises to perform services and an employer promises to pay a salary is a bilateral contract. A services agreement, a loan agreement, a sale agreement, and a lease are all bilateral contracts. Understanding what a bilateral contract is, how it is formed, and how it is enforced under Indian law is foundational knowledge for any commercial legal team.
What Makes a Contract Bilateral
A bilateral contract is formed when one party makes an offer and the other party accepts it by making a return promise. The acceptance takes the form of a commitment to perform rather than the immediate performance of an act.
Under the Indian Contract Act, 1872, a contract requires offer, acceptance, consideration, and the intention to create legal relations. In a bilateral contract:
The offer is made by one party proposing specific terms: “I will deliver 1,000 units of product X at INR 500 per unit, to your warehouse by 31 December.”
The acceptance is made by the other party agreeing to those terms and making a return promise: “I accept, and I will pay INR 5,00,000 within 30 days of delivery.”
The consideration in a bilateral contract is the mutual exchange of promises. Each party’s promise is the consideration for the other party’s promise. Under Section 2(d) of the Indian Contract Act, consideration includes an act, abstinence, or promise by the promisee. A promise is explicitly included as valid consideration, which is the legal basis for bilateral contracts.
At the moment of acceptance, both parties are bound by their respective promises. Neither party has yet performed, but both are obligated to perform.
Bilateral Contract vs Unilateral Contract
The distinction between bilateral and unilateral contracts is conceptually important and has practical implications for when and how obligations arise.
In a bilateral contract, both parties make promises at the time the contract is formed. Both are bound from the moment of agreement. If either party fails to perform their promise, they are in breach of contract.
In a unilateral contract, only one party makes a promise. The promisor commits to doing something if the other party performs a specific act, but the other party makes no promise to perform the act. The classic example is a reward offer: “I will pay INR 10,000 to anyone who finds and returns my lost dog.” The person who finds the dog is not obligated to look for it or to return it. But if they do return the dog, the promisor is bound to pay the reward.
The practical difference is in when obligations arise. In a bilateral contract, both parties are bound at formation. In a unilateral contract, only the promisor is bound at formation, and the other party’s obligation arises only if and when they choose to perform the act.
In commercial practice, most contracts are bilateral. Unilateral contracts arise most commonly in reward offers, tender processes in some formulations, and certain insurance arrangements.
Essential Elements of a Valid Bilateral Contract
For a bilateral contract to be valid and enforceable under the Indian Contract Act, it must satisfy the requirements of Section 10:
Free consent of the parties. Both parties must consent to the contract without coercion, undue influence, fraud, misrepresentation, or mistake. A contract entered into under duress or through misrepresentation is voidable at the option of the aggrieved party.
Competence of the parties. Both parties must be competent to contract. Under Section 11 of the Contract Act, a person is competent if they are of the age of majority, of sound mind, and not disqualified from contracting by any law. Contracts with minors are void in India, which is relevant in consumer-facing digital contracts.
Lawful consideration. The consideration on both sides must be lawful. Consideration is unlawful if it is forbidden by law, would defeat the provisions of any law, is fraudulent, causes injury to another person, or the court regards it as immoral or opposed to public policy. A contract in which one party promises to pay for an unlawful act is void.
Lawful object. The object of the contract must be lawful by the same standards as consideration. A contract to supply goods for an illegal purpose is void even if the supply itself is lawful.
Not expressly declared void. The Contract Act declares certain agreements void: agreements in restraint of trade (Section 27), agreements in restraint of legal proceedings (Section 28), uncertain agreements (Section 29), wagering contracts (Section 30), and agreements contingent on impossible events (Section 36). A bilateral contract that falls within any of these void categories is unenforceable regardless of the parties’ intentions.
Common Examples of Bilateral Contracts in Indian Commercial Practice
Vendor and supply agreements. The supplier promises to deliver specific goods or services, and the buyer promises to pay the agreed price. The obligations are mutual: delivery triggers the payment obligation, and the payment obligation is contingent on delivery according to the agreed specification.
Employment contracts. The employer promises to provide work, pay the agreed salary, and provide the benefits specified in the contract. The employee promises to perform the work as described and to comply with the employer’s policies. Both parties are bound from the date the contract is signed.
Technology services and SaaS agreements. The technology vendor promises to provide access to software, maintain specified service levels, and provide support. The customer promises to pay the licence or subscription fee and to comply with the usage terms. The mutual obligations include ongoing performance on both sides throughout the contract term.
Loan agreements. The lender promises to advance a specified sum, and the borrower promises to repay the principal with interest according to the agreed schedule. Both obligations are created at the time of the agreement, although the lender’s obligation to advance funds is typically conditional on conditions precedent being satisfied.
Sale agreements. Under the Sale of Goods Act, 1930, a sale agreement creates bilateral obligations: the seller promises to transfer the property in goods and deliver them, and the buyer promises to pay the price.
Distribution and franchise agreements. The franchisor promises to grant rights to use the brand, provide training, and supply products. The franchisee promises to pay fees, meet quality standards, and comply with the franchise system requirements. Both sets of obligations are ongoing throughout the agreement.
Construction contracts. The contractor promises to complete specified work within a defined period and to the required standard. The employer promises to pay the contract sum in instalments linked to completion milestones. Both parties’ obligations are mutually dependent.
Formation of Bilateral Contracts in India
Written versus oral bilateral contracts
There is no general requirement under the Indian Contract Act that a bilateral contract be in writing to be valid. An oral bilateral contract, where both parties make oral promises, is as valid as a written one, subject to the provisions of specific legislation that require particular types of contracts to be in writing.
In practice, written contracts are essential for commercial transactions for evidentiary reasons. In a dispute, the parties need to prove what they agreed to. An oral contract is enforceable, but proving its terms in court depends on witness testimony, which is inherently less reliable than documentary evidence. For contracts involving significant consideration, the risk of a dispute about what was agreed, combined with the difficulty of proving oral terms, makes written contracts standard commercial practice.
Stamp duty requirements for written bilateral contracts
Written bilateral contracts executed in India may attract stamp duty under applicable state stamp acts. The duty is imposed on the instrument, not the underlying transaction, and the rate depends on the nature of the agreement and the state in which it is executed. An unstamped or inadequately stamped instrument is inadmissible as evidence in Indian courts, which eliminates its utility in any dispute about the contract’s terms.
Electronic bilateral contracts
Section 10A of the Information Technology Act, 2000 makes clear that contracts formed electronically are valid and enforceable. A bilateral contract formed through an exchange of emails, through a digital acceptance mechanism, or through a signed electronic document is as valid as a paper contract, subject to the specific requirements for particular contract types (such as the Section 65B certification requirements for electronic records used as evidence in proceedings).
Obligations Under a Bilateral Contract: What Happens When One Party Does Not Perform
Breach and remedies
When one party to a bilateral contract fails to perform their promise, they are in breach. The other party, the innocent party, has several remedies under Indian law.
Termination for material breach. Where the breach goes to the root of the contract, typically described as a repudiatory breach, the innocent party may treat the contract as terminated and is released from their own obligations. The right to terminate for breach requires that the breach be of a sufficiently fundamental nature, unless the contract specifically designates a particular obligation as a condition, breach of which entitles the innocent party to terminate.
Damages. Under Section 73 of the Contract Act, the innocent party is entitled to compensation for loss that naturally arises in the usual course of events from the breach, or which the parties knew, when the contract was made, was likely to result from the breach. Consequential and remote losses that were not within the reasonable contemplation of the parties at the time of contracting are not recoverable under Section 73.
Specific performance. Where damages are not an adequate remedy, the innocent party may apply to the court for an order requiring the breaching party to perform their contractual obligations. Under the Specific Relief Act, 1963, specific performance is available for contracts involving immovable property, rare goods, and contracts where the breach cannot be adequately compensated by damages.
Injunction. The innocent party may also seek an injunction to prevent the breaching party from doing something they have promised not to do, or to preserve the status quo pending resolution of the dispute.
Anticipatory breach
Where one party indicates, before the time for performance, that they will not perform their obligations, this is an anticipatory breach. Under Section 39 of the Indian Contract Act, when a party to a contract has refused to perform or disabled themselves from performing their obligations, the promisee may put an end to the contract unless they have signified their acquiescence in its continuance. The innocent party can sue for damages immediately without waiting for the time of performance to arrive.
Bilateral Contracts and Indian Commercial Practice
Conditions precedent and subsequent
Many commercial bilateral contracts include conditions that must be satisfied before the primary obligations take effect (conditions precedent) or events that will affect the obligations after they have arisen (conditions subsequent). Loan agreements commonly require conditions precedent, such as obtaining necessary approvals and delivering security documents, to be satisfied before the lender’s disbursement obligation arises. Understanding whether a condition is a condition precedent or a term of the contract, and what the consequence of non-satisfaction is, is an important element of reviewing bilateral contracts.
Implied terms under Indian law
The Indian Contract Act implies certain obligations into bilateral contracts. Section 55 implies an obligation that where time is of the essence and a party fails to perform by the specified time, the contract becomes voidable at the option of the other party. Sections 41 to 54 imply obligations relating to reciprocal promises, covering the order in which reciprocal promises must be performed and the effect of one party preventing the other from performing.
Courts also imply terms of reasonableness and good faith in commercial contracts in certain circumstances, although the Indian Supreme Court has been cautious about implying terms that would alter the express bargain of the parties.
Standard form bilateral contracts and unfair terms
Many bilateral contracts are presented on standard terms prepared by one party. The Indian Contract Act does not have a general unfair contract terms statute comparable to some other jurisdictions, but courts have the power under the general law to refuse to enforce terms that are unconscionable or against public policy. This is most relevant in consumer contracts, where the Consumer Protection Act, 2019 provides additional protections against unfair terms.
Conclusion
A bilateral contract is the legal instrument through which the vast majority of Indian commercial relationships are formed and governed. Its essential characteristic is the mutual exchange of promises: both parties commit to performance at the moment the contract is formed. When either party fails to honour their promise, the Indian Contract Act provides a framework of remedies that allows the innocent party to seek compensation, termination, or in appropriate cases specific performance.
For commercial legal teams, understanding what constitutes a valid bilateral contract, how obligations are created and triggered, and what happens when one party breaches is the foundation on which all contract drafting, review, and dispute management work is built.
Frequently Asked Questions
What is a bilateral contract?
A bilateral contract is a contract in which both parties make mutual promises. Each party is both a promisor and a promisee. At the moment of agreement, both parties are bound by their respective obligations. Most commercial contracts, including supply agreements, services contracts, employment contracts, loan agreements, and sale agreements, are bilateral contracts.
How is a bilateral contract different from a unilateral contract?
In a bilateral contract, both parties make promises and both are bound at the time of formation. In a unilateral contract, only one party makes a promise, and the other party is not obligated to act but becomes entitled to the promised benefit if they choose to perform the specified act. A reward offer is a classic example of a unilateral contract: the person who finds the lost item is not obligated to search for it, but if they do return it, the promisor is bound to pay.
Are oral bilateral contracts valid in India?
Yes. There is no general requirement under the Indian Contract Act that a bilateral contract be in writing to be valid. An oral bilateral contract is as valid as a written one. However, oral contracts are significantly more difficult to enforce in practice because proving their terms depends on witness testimony rather than documentary evidence. For any commercial transaction involving significant consideration, written contracts are standard practice.
What happens if one party does not perform their obligations under a bilateral contract?
The non-performing party is in breach of contract. The innocent party has several remedies under Indian law: they may terminate the contract if the breach is fundamental, claim damages under Section 73 of the Contract Act for losses that naturally arise from the breach, seek specific performance where damages are an inadequate remedy, or apply for an injunction. Where one party indicates in advance that they will not perform, this constitutes an anticipatory breach under Section 39 and gives the innocent party an immediate right to sue without waiting for the performance date.
Does a bilateral contract need to be stamped?
Written bilateral contracts executed in India may attract stamp duty under applicable state stamp acts, depending on the nature of the agreement and the state of execution. An unstamped or inadequately stamped bilateral contract is inadmissible as evidence in Indian courts, which prevents a party from relying on the contract in any legal proceedings about its terms. Stamp duty assessment should be part of the contract execution process for all significant commercial agreements.
