Classification of Contract Under the Indian Contract Act, 1872: Types With Business Examples
Every business runs on contracts: a vendor's purchase order, a client's service agreement, a co-founder agreement, an office lease, even a customer clicking "I agree" on a website. Knowing how contracts are classified helps you understand which agreements a court will enforce, which can be cancelled, and which were never binding in the first place.
This guide explains the classification of contract under the Indian Contract Act, 1872, using practical examples from startups and small businesses.
Quick answer: Contracts are classified on four bases: (1) validity — valid, void, voidable, illegal and unenforceable; (2) formation — express, implied, quasi and e-contracts; (3) performance — executed, executory, unilateral and bilateral; and (4) special types recognised by the Act — contingent, indemnity, guarantee, bailment, pledge and agency.
Essentials of a Valid Contract (Section 10)
Section 2(h) defines a contract as an agreement enforceable by law. Under Section 10, an agreement becomes a contract when it has:
- Offer and acceptance between two or more parties.
- Free consent, without coercion, undue influence, fraud, misrepresentation or mistake.
- Competent parties: majors of sound mind, not disqualified by law.
- Lawful consideration: something of value exchanged.
- Lawful object: not illegal, immoral or opposed to public policy.
- Not expressly declared void by the Act.
- Certainty of terms and the intention to create legal relations.
If any essential is missing, the agreement falls into one of the other categories below.
1. Classification Based on Validity
| Type | Meaning | Section | Example |
| Valid contract | Satisfies all essentials; enforceable | 10 | A signed agreement to supply 500 cartons at ₹40 each |
| Void contract | Was valid but became unenforceable | 2(j) | A supply contract that becomes impossible after a government ban on the product |
| Void agreement | Unenforceable from the start | 2(g), 24–30 | An agreement in restraint of trade, such as a vendor promising never to do business anywhere |
| Voidable contract | Enforceable at the option of one party | 2(i), 19 | A distributor signs after being misled about margins; the distributor can cancel |
| Illegal agreement | Object is unlawful; collateral agreements are also tainted | 23 | An agreement to sell goods without paying GST, by mutual understanding |
| Unenforceable contract | Valid but cannot be enforced due to a technical defect | Various | An agreement that required registration or stamping but was not stamped (until the defect is cured) |
Void vs voidable: the key difference
A void contract gives no rights to anyone. A voidable contract is valid until the aggrieved party chooses to cancel it. If the aggrieved party does not act, the contract continues.
Example: A startup founder signs a share purchase agreement after an investor falsely claims to have prior board approvals. The agreement is voidable at the founder's option because consent was obtained by misrepresentation.
2. Classification Based on Formation
| Type | Meaning | Section | Example |
| Express contract | Terms stated in words, written or oral | 9 | A written software development agreement |
| Implied contract | Terms inferred from conduct | 9 | Sitting in a taxi and getting dropped at your destination |
| Quasi contract | Not a real contract; obligation imposed by law to prevent unjust enrichment | 68–72 | A courier delivers a parcel to the wrong office, and the recipient uses the goods; they must pay or return |
| E-contract | Formed electronically (click-wrap, email acceptance) | Recognised by the IT Act, 2000 (Sec. 10A) | Accepting terms of service on a SaaS platform |
Quasi contracts in business
Sections 68 to 72 cover situations like:
- Supply of necessaries to a person incapable of contracting (Section 68).
- Payment by an interested person of money due from another (Section 69).
- Benefit of a non-gratuitous act (Section 70) — for example, a contractor completes extra work at a client's request without a written variation, and the client uses it.
- Money paid or goods delivered by mistake (Section 72).
3. Classification Based on Performance
| Type | Meaning | Example |
| Executed contract | Both parties have fully performed | Goods delivered and full payment received |
| Executory contract | Performance is pending on one or both sides | An annual maintenance contract signed but not yet started |
| Unilateral contract | Only one party has an obligation outstanding | A reward offered for returning a lost laptop |
| Bilateral contract | Both parties have obligations outstanding | Vendor must deliver; buyer must pay on delivery |
4. Special Contracts Under the Act
| Contract | Section | Business use |
| Contingent contract | 31 | Payment of a bonus only if a product passes certification |
| Wagering agreement | 30 | Void; bets on uncertain events |
| Contract of indemnity | 124 | A supplier promises to compensate a buyer for losses caused by defective goods |
| Contract of guarantee | 126 | A director guarantees repayment of a company loan |
| Bailment | 148 | Goods left with a warehouse or a repairer |
| Pledge | 172 | Gold or goods pledged as security for a loan |
| Agency | 182 | Appointing a distributor or sales agent to act on your behalf |
Contingent contracts (Sections 31–36)
A contingent contract depends on a future uncertain event collateral to the contract.
Example: An angel investor agrees to invest ₹25 lakh if the startup receives DPIIT recognition by March. If recognition comes on time, the investment becomes enforceable. If the event becomes impossible, the contract becomes void (Section 32).
Why Classification Matters for Your Business
- Drafting: Knowing what makes a contract voidable helps you build in clear representations and disclosures.
- Disputes: It decides whether you can claim damages, seek specific performance, or only recover what you paid.
- Stamp duty and registration: Unstamped agreements may be inadmissible as evidence until duty and penalty are paid.
- Restrictive clauses: Post-termination non-compete clauses with employees or vendors are generally void under Section 27, though reasonable confidentiality clauses are enforceable.
Common Mistakes
Relying on oral agreements for large deals. Oral contracts are valid but hard to prove.
Including broad non-compete clauses. Post-termination restraints are usually void under Section 27.
Not stamping agreements. This creates evidentiary problems in court.
Signing with a minor. Agreements with minors are void (Mohori Bibee v. Dharmodas Ghose, 1903).
Frequently Asked Questions
1. What are the main types of contracts? Based on validity (valid, void, voidable, illegal, unenforceable), formation (express, implied, quasi, e-contracts), performance (executed, executory, unilateral, bilateral) and special contracts (contingent, indemnity, guarantee, bailment, pledge, agency).
2. What is the difference between void and voidable contracts? A void contract is not enforceable by anyone. A voidable contract is valid until the aggrieved party chooses to cancel it.
3. What is a quasi contract? An obligation imposed by law, under Sections 68–72, to prevent unjust enrichment, even though no actual agreement exists.
4. Is an oral contract valid in India? Yes, unless a law requires the contract to be in writing or registered, such as a sale of immovable property.
5. Are online click-wrap agreements valid? Yes. Electronic contracts are recognised under Section 10A of the Information Technology Act, 2000.
6. What is a contingent contract? A contract whose performance depends on a future uncertain event collateral to the contract, under Section 31.
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