Marelize Botha v Ruark Botha

The appellant and respondent were married on 4 November 2000 out of community of property with the accrual system. Following divorce proceedings in the Regional Court of Northwest (Klerksdorp), a final decree of divorce incorporating a settlement agreement was made an order of court on 9 March 2021. Under clause 3.2 of the settlement agreement, the respondent agreed to pay R2,650,000 to the appellant in settlement of the accrual claim. Several months later on 1 July 2021, the respondent applied to vary the settlement agreement, claiming the accrual amount had been incorrectly calculated due to a mistake common to both parties, and that the calculations overstated his liability by R1,244,237.77. The regional court granted the variation order without oral argument and ordered the appointment of a liquidator to determine the accrual amount. The appellant appealed to the high court, which dismissed the appeal on the grounds that the order was interlocutory and not appealable. Both parties were medical professionals (urologist and occupational therapist) who were represented by attorneys and counsel during negotiations. The respondent's former attorneys stated there was no error in the calculations and that the settlement was fair and equitable.

• Whether there was a common mistake between the parties when they signed the settlement agreement that would justify variation of the agreement
• Whether the respondent's alleged mistake qualified as justus error sufficient to set aside or vary the settlement agreement
• Whether the regional court's order was final in effect and therefore appealable
• Whether the high court erred in finding that the order was interlocutory and not appealable

The application for special leave to appeal succeeded. The appeal was upheld with costs. The order of the high court was set aside and replaced with an order that: (1) the appeal is upheld with costs; and (2) the application for variation is dismissed with costs.

A settlement agreement incorporated into a divorce order cannot be varied on the basis of an alleged common mistake where: (1) there was no misrepresentation by either party; (2) the agreement was reached after protracted negotiations with both parties legally represented; (3) the alleged mistake is at best a unilateral error by the party seeking variation; and (4) the mistake, if any, was due to that party's own fault or poor judgment rather than any conduct by the other party. A mistake that is attributable to a party's own fault does not constitute justus error sufficient to allow that party to resile from a contractual obligation. For an error to be justus, the party seeking to resile must not have been to blame by his conduct in leading the other party, as a reasonable person, to believe he was binding himself. A settlement agreement (transactio) is a final settlement of disputed or uncertain rights or obligations that has the effect of res iudicata and extinguishes the disputed rights or obligations. An order is appealable if it is final in effect, definitive of the rights of the parties, and disposes of at least a substantial portion of the relief claimed.

The Court noted that the settlement amount included various aspects that formed the basis of the parties' dispute, including the appellant's maintenance claim, the accrual, withdrawals made by the respondent from the bond, the transfer and sale of property, and shares in their business. The Court observed that the respondent blamed his former attorneys for giving incorrect legal advice, but noted that the respondent's former attorneys stated there was no error in the calculations and that the settlement was fair and equitable. The Court commented that there was litigation pending between the respondent and his former attorneys regarding alleged negligence. The Court noted that there was no justification for the regional court to appoint a liquidator, as this was not relief sought by either party.

This case is significant in South African family law and contract law for clarifying the limited circumstances under which a settlement agreement incorporated into a divorce order can be varied or set aside. It reinforces the principle that settlement agreements are final compromises intended to end litigation and have res iudicata effect. The judgment emphasizes the high threshold for establishing justus error and distinguishes between common mistake (which may vitiate consent) and unilateral mistake due to a party's own fault (which does not). It also clarifies when an order is appealable by confirming that an order that is final in effect and definitive of parties' rights is appealable, not interlocutory. The case provides important guidance on the sanctity of settlement agreements in divorce proceedings and protects parties from attempts to renegotiate concluded settlements based on alleged miscalculations or regret, particularly where the party seeking to resile was legally represented during negotiations.