Margo v Gardner

The dispute arose from a judgment debt owed by Tony Ricky Gardner to Roger Hugh Margo following earlier litigation between the parties. In 2006 the Supreme Court of Appeal ordered Gardner (and conditionally OTR Mining Ltd) to pay Margo a capital amount of R1 461 432 plus interest at 15.5% per annum from 1 September 1998 to date of payment. Gardner subsequently made two substantial payments in 2006, believing that these settled the capital amount and that only costs remained outstanding. Margo disagreed and, after taxation of costs and disputes over interest calculations, caused writs of execution to be issued for outstanding interest and capital. Gardner launched applications to suspend and set aside the writs, contending that the in duplum rule limited the interest recoverable and that the judgment debt had been satisfied. Conflicting High Court judgments followed, one holding the in duplum rule inapplicable and the other finding it applicable, leading to cross-appeals before the Supreme Court of Appeal.

In case 564/09 (Margo’s appeal), the appeal was dismissed with costs. In case 511/09 (Gardner’s appeal), the appeal was upheld with costs, the order of the High Court was set aside, and substituted with an order dismissing Gardner’s application with costs. The writs of execution issued by Margo were effectively upheld.

This judgment is significant for clarifying the application of the in duplum rule in South African law, particularly its suspension during litigation and its effect on judgment debts. It reaffirmed and authoritatively applied the principles set out in Oneanate, resolving conflicting High Court interpretations and providing certainty on how interest on judgment debts accrues pendente lite and post-judgment.