Macquarie Bank Ltd v Supergrasse Pty Ltd

Macquarie Bank Ltd (the appellant) appealed to the New South Wales Court of Appeal against a decision of the Supreme Court of New South Wales. The dispute concerned the enforceability of a guarantee provided by Supergrasse Pty Ltd (the respondent) in favour of Macquarie Bank. The guarantee related to a loan facility extended by the bank to a third party, and the bank sought to enforce the guarantee after the third party defaulted.

The primary legal issue before the Court of Appeal was whether the guarantee was void for uncertainty. Specifically, the court had to determine if the terms of the guarantee, particularly concerning the extent of the liability assumed by Supergrasse, were sufficiently clear and definite to be legally enforceable. A related issue was whether the guarantee was void for illegality, as it was alleged to have been given in contravention of certain provisions of the Companies Act 1961 (NSW).

The Court of Appeal, in its reasoning, considered the principles of contractual certainty. It held that for a contract to be valid, its essential terms must be sufficiently defined. Applying this principle, the court found that the guarantee, as drafted, lacked the necessary certainty regarding the scope of Supergrasse's obligations. The court also examined the alleged illegality, concluding that the guarantee did not contravene the relevant provisions of the Companies Act. However, the lack of certainty was determinative.

Consequently, the Court of Appeal allowed the appeal, finding the guarantee to be void for uncertainty. The court ordered that the judgment entered in the Supreme Court in favour of Macquarie Bank be set aside.