Commercial Bank of Australia Ltd v Amadio

The High Court of Australia considered an appeal concerning a guarantee provided by Mr. and Mrs. Amadio to the Commercial Bank of Australia Ltd. The Amadios, who were elderly Italian migrants with limited English and business experience, guaranteed their son's company's overdraft. The company subsequently defaulted, and the bank sought to enforce the guarantee. The Amadios sought to set aside the guarantee, alleging unconscionable conduct by the bank.

The central legal issue before the High Court was whether the bank had acted unconscionably in obtaining the guarantee from the Amadios. This involved determining whether the bank had exploited the Amadios' special disadvantage, which was their age, lack of English, and limited business acumen, and whether the bank had actual or constructive knowledge of this disadvantage. The court also had to consider whether the transaction was fair, just, and reasonable in the circumstances.

The High Court found in favour of the Amadios, holding that the bank had engaged in unconscionable conduct. The majority reasoned that the bank, through its officers, was aware of the Amadios' vulnerability and their reliance on their son's advice. The bank failed to take adequate steps to ensure the Amadios understood the nature and effect of the guarantee, particularly given the significant financial risk involved. The court applied the equitable doctrine of unconscionable dealing, which requires a party to refrain from unconscientiously exploiting a special disadvantage of another party where that disadvantage is known or ought to be known. The guarantee was therefore set aside.