J Z Brink v Humphries & Jewell (Pty) Limited

Humphries & Jewell (Pty) Ltd granted credit to Guzto Log Homes (Pty) Ltd. A standard one-page credit application form, completed by the company’s project manager, was signed by J Z Brink, a director of the company, in a representative capacity. Unbeknown to Brink, the form contained a clause by which the signatory bound himself as personal surety and co‑principal debtor for the company’s debts. The respondent did not draw this clause to Brink’s attention. When the company defaulted, the respondent sued the company as principal debtor and Brink personally as surety. Brink raised the defence of iustus error, contending that he believed he was signing only a company credit application and had no intention to bind himself personally.

Appeal upheld with costs; the order of the High Court was set aside and replaced with an order dismissing the plaintiff’s claim with costs.

The case is a leading authority on iustus error in South African contract law, particularly in the context of credit application forms containing embedded suretyships. It emphasises that misleading document design can defeat reliance on the caveat subscriptor rule and highlights the duty on credit providers to clearly draw personal suretyship obligations to the attention of signatories.