Siltek Holdings (Pty) Ltd (in liquidation) t/a Workgroup v Business Connexion Solutions (Pty) Ltd

Between August and October 2001, the appellant sold and delivered goods valued at R436,430.97 to the respondent. Payment was due within 30 days from delivery. Before the 30-day payment period lapsed, the appellant was liquidated on 16 October 2001 for failure to pay its debts. Under a separate agreement, the appellant owed the respondent commission of R594,032.34 for introducing Telkom as a customer. This commission became due and payable before the appellant's liquidation, but the respondent did not demand payment or claim set-off before liquidation. The respondent raised set-off for the first time in its plea to the liquidator's claim.

• Whether set-off can operate between a debt that is due but not yet payable and a debt that is both due and payable
• Whether mutuality required for set-off existed before the concursus creditorum was established
• Whether set-off can be claimed after liquidation when the mutual debts did not both become payable before the commencement of liquidation
• The requirements for valid set-off in South African common law

1. The appeal was upheld with costs. 2. The order of the court a quo was set aside and replaced with: (a) The defendant (respondent) is ordered to pay R436,430.97 with interest at 15.5% from date of default to date of payment; (b) The defendant is ordered to pay costs of the action.

For set-off to operate in South African law, two parties must owe each other liquidated debts which are both payable. Once a concursus creditorum has been established through liquidation, set-off cannot operate unless mutuality between the respective claims existed at the date of the liquidation order. Mutuality requires that the reciprocal debts both existed and that both were liquidated and payable before the concursus creditorum was established. A debt that is due but not yet payable at the date of liquidation cannot subsequently be set off against a debt that was due and payable before liquidation, as this would undermine the collective rights of creditors established by the concursus creditorum.

The court considered, without deciding, the academic argument advanced by De Wet and Van Wyk that a party whose debt has become due and payable should be able to set it off against a debt which is due but not yet payable. The court assumed in the respondent's favour (without expressing a view on correctness) that such set-off might theoretically be possible where the other requirements for set-off are met. However, the court observed that even if this were accepted, such set-off could not logically be considered to have taken place at a time earlier than when the election to effect payment by way of set-off was made. This would still preclude the respondent from claiming set-off after liquidation due to the intervening concursus creditorum.

This case provides authoritative clarification of the requirements for set-off in South African common law, particularly in the context of insolvency. It reaffirms the principle that for set-off to operate, both reciprocal debts must be liquidated and payable. Critically, it establishes that once a concursus creditorum is created through liquidation, set-off cannot be claimed unless mutuality (both debts being liquidated and payable) existed before the liquidation order. The judgment protects the collective rights of creditors in insolvency by preventing post-liquidation set-off claims that would give preferential treatment to certain creditors. It also clarifies that set-off cannot operate retrospectively to a time before the election to set off was made, even if one were to accept the theoretical proposition that a payable debt could be set off against a non-payable one.