Eumina Investments Pty Limited v Westpac Banking Corporation

Eumina Investments Pty Limited (the plaintiff) brought proceedings against Westpac Banking Corporation (the defendant) in the High Court of Australia. The dispute concerned the interpretation and effect of a guarantee provided by Eumina Investments in favour of Westpac, relating to a loan facility extended to a related company, Eumina Pty Limited. Eumina Investments sought declarations that it was not liable under the guarantee, alleging that Westpac had breached its duty of care to Eumina Investments by failing to exercise reasonable care in the conduct of its dealings with Eumina Pty Limited, and by failing to notify Eumina Investments of material changes to the loan facility.

The central legal issues before the High Court were whether Westpac owed a duty of care to Eumina Investments as a guarantor, and if so, what the scope of that duty was. Specifically, the court had to determine whether Westpac's conduct in managing the loan facility, including its dealings with the principal debtor and any modifications to the facility, could give rise to a breach of a duty owed to the guarantor. The court also considered whether any such duty extended to notifying the guarantor of material changes that might increase its liability.

Gleeson CJ and Gummow J held that, in the absence of special circumstances, a bank does not owe a duty of care to a guarantor in relation to the conduct of its dealings with the principal debtor. Their Honours reasoned that the relationship between a bank and a guarantor is primarily contractual, governed by the terms of the guarantee. While a bank must act in good faith, this does not impose a general duty to protect the guarantor from the consequences of the principal debtor's default or to advise the guarantor about the risks involved. The court found that the terms of the guarantee did not create any such positive duty on the part of Westpac, and that the alleged breaches did not fall within any recognised exception to the general rule.

The High Court dismissed the appeal, upholding the decision of the Full Federal Court.