Huppert v Stock Options of Australia Pty Ltd

The High Court of Australia considered an appeal by the plaintiff, Huppert, against the defendant, Stock Options of Australia Pty Ltd, concerning the validity of a contract for the sale of shares. The dispute arose from an agreement where the plaintiff agreed to sell 100,000 shares in a company to the defendant, with the purchase price to be paid in instalments. The plaintiff alleged that the defendant had breached the contract by failing to make the final instalment payment.

The central legal issue before the Court was whether the contract for the sale of shares was void for uncertainty. Specifically, the Court had to determine if the terms relating to the payment of the purchase price were sufficiently defined to constitute a binding agreement, or if they were so vague as to render the contract unenforceable.

The Court reasoned that for a contract to be valid, its essential terms must be sufficiently certain. In this instance, the agreement stipulated that the balance of the purchase price was to be paid "as and when the vendor shall require the same". The Court found that this provision lacked the necessary certainty to establish a definite obligation on the part of the purchaser to pay the balance of the purchase price at any particular time or in any particular manner. Consequently, the Court held that the contract was void for uncertainty, as the parties had not reached an agreement on a fundamental aspect of the transaction.

The High Court allowed the appeal, finding the contract to be void for uncertainty.