Contract Act, Section 20

Contract Act, Section 20: Agreement Void Where Both Parties Are Under Mistake as to a Matter of Fact

Section 20 of the Indian Contract Act, 1872 provides that an agreement is void where both parties are under a mistake regarding a fact essential to the agreement, as there is no genuine consensus.

The section distinguishes a fundamental mistake of fact from an erroneous opinion as to value, making only material mistakes sufficient to invalidate the agreement.

1. Purpose of Section 20

The primary objective of Section 20 is to ensure that contracts are based on a genuine mutual understanding of the essential facts relating to the agreement.

The section protects both parties by declaring agreements void where they are entered into under a common and fundamental mistake of fact.

2. Meaning of Mistake of Fact

A mistake of fact refers to an incorrect belief regarding an existing fact relevant to the agreement and must relate to facts existing at the time the contract is made.

Section 20 applies only to genuine and common mistakes of fact that are essential to the agreement, and not to mistakes of law.

3. Bilateral Mistake

Section 20 applies only where both parties are mistaken about the same essential fact, resulting in a bilateral or mutual mistake.

This differs from a unilateral mistake, where only one party is mistaken, as the absence of mutual understanding in a bilateral mistake makes the agreement void.

4. Matter of Fact Essential to the Agreement

Not every mistake of fact renders a contract void, as the mistake must relate to a fact that is essential to the agreement.

If the mistaken fact concerns the foundation, subject matter, identity, or performance of the contract, Section 20 applies, but mistakes relating to incidental matters do not invalidate the agreement.

5. Effect of Bilateral Mistake

Where both parties are mistaken regarding an essential fact, the agreement is void from the very beginning under Section 20.

Since the parties entered into the agreement under a fundamental misunderstanding, no valid contractual rights or obligations arise due to the absence of genuine consent.

6. Principle of Consensus ad Idem

Section 20 is closely connected with the principle of consensus ad idem, which requires the parties to agree upon the same thing in the same sense.

Where both parties are mistaken about an essential fact, there is no true meeting of minds, and the apparent agreement cannot be recognized as a valid contract.

7. Essential Facts Distinguished from Minor Errors

The law distinguishes between mistakes relating to essential facts and minor errors that do not affect the substance of the agreement.

Only mistakes that go to the root of the transaction and prevent genuine contractual consensus render the agreement void under Section 20.

8. Mistake as to Value Is Not Covered

The explanation to Section 20 provides that an erroneous opinion regarding the value of the subject matter is not treated as a mistake of fact.

A mistake in assessing value is regarded as an error of judgment rather than a mistake about an existing fact and therefore does not make the agreement void.