Bell v. Lever Bros Ltd

[1932] Appeal Cases 161House of Lords (UK)1932Law of Contract I

Rule established

A common mistake as to a quality of the subject matter of a contract renders the contract void only if the mistake is so fundamental as to make the subject matter essentially different from what the parties believed it to be.

Facts

The defendant company paid the plaintiff substantial compensation for early termination of his employment contract
Neither party was aware, at the time, that the plaintiff had committed breaches of duty that would have justified summary dismissal without any compensation
Upon discovering this, the company sought to have the termination agreement declared void for common mistake

Issue

Whether a common mistake regarding a quality of the contract's subject matter (here, the employee's actual entitlement to compensation) renders the agreement void.

Held

A common mistake as to quality renders a contract void only where the mistake is so fundamental that the subject matter is essentially different from what both parties believed it to be
The mistake here, though significant and financially consequential, did not render the underlying subject matter (a termination agreement) essentially different in this fundamental sense
The termination agreement remained valid despite the mistake

Ratio Decidendi

Common mistake as to quality of the subject matter renders a contract void only where the mistake is sufficiently fundamental to make the subject matter essentially different from what was believed. This is a demanding threshold that mere financial disadvantage or significant miscalculation does not automatically satisfy.

How to use it in an exam

Part A: Sets the high threshold for common mistake as to quality voiding a contract.
Part B: Contrast with Raffles v Wichelhaus (1864): mutual mistake as to identity of subject matter is a more clear-cut category of mistake than this quality-based common mistake analysis.
Key line: "Common mistake as to quality voids a contract only where the mistake makes the subject matter essentially different from what was believed."

Source

Source: [1932] AC 161

This is an educational summary, not the judgment itself. Cite the reported version in professional or academic work.

Cited in study notes

Law of Contract IMistakeHigh threshold for common mistake as to quality