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What Bath v Bath decided, and why not every drafting problem makes an ANC invalid
An antenuptial contract can be declared void for vagueness where its terms are so contradictory and incoherent that a court cannot determine what the parties actually agreed.
This was confirmed by the Supreme Court of Appeal in Bath v Bath (952/12) [2014] ZASCA 14. But total invalidity is not the only, or even the most common, consequence of a poorly drafted ANC.
Many drafting problems affect only a specific clause — commonly an exclusion of assets from accrual — without undermining the contract as a whole. The distinction matters, because the two situations call for entirely different legal responses.
This article provides general information about South African law. It does not constitute legal advice and does not predict the outcome of an individual matter.
| Question | General position |
| Can a court declare an ANC invalid? | Yes, where its terms are so contradictory or unclear that the parties’ agreement cannot be established. |
| Does every vague clause invalidate the whole ANC? | No. A narrower drafting problem — such as an unclear exclusion clause — may affect only that provision. |
| What did Bath v Bath decide? | The SCA held the ANC void for vagueness, meaning the marriage reverted to the default position of in community of property. |
| Is there a difference between “invalid” and “needs interpretation”? | Yes. Interpretation, rectification, and outright invalidity are different legal questions requiring different remedies. |
| Does an unregistered ANC become invalid? | Not necessarily. Registration and validity are separate questions, covered separately in our guide on unregistered ANCs. |
| Can an unclear exclusion clause alone void the ANC? | Not automatically. Courts have upheld a contract’s validity while resolving only the disputed exclusion. |
Mr Harry Mark Deon Bath and Mrs Juanita Bath signed an antenuptial contract shortly before their marriage.
When the marriage later broke down, the ANC itself became the central dispute — not merely how it should be interpreted, but whether it was a valid contract at all.
The ANC’s provisions were contradictory and, in places, difficult to reconcile with one another. Mrs Bath challenged the contract’s clarity and coherence; Mr Bath maintained it was enforceable.
Writing for the Supreme Court of Appeal, Lewis JA held that the ANC was void for vagueness. The Court’s reasoning was straightforward: a contract must be capable of establishing, with reasonable certainty, what the parties actually agreed.
Where its terms are so contradictory that this cannot be determined, the contract cannot be given legal effect.
The practical consequence followed automatically from that finding.
Once the ANC was void, there was no valid agreement excluding community of property — so the marriage was treated as being in community of property by default, since that is the position the law applies whenever no valid ANC provides otherwise.
No — and this is the point most likely to be misunderstood from Bath v Bath alone.
Bath v Bath involved a contract so internally inconsistent that the court could not determine the parties’ intention at all.
That is a different and more serious problem than an ANC that is generally clear but contains one poorly worded provision — most commonly, an exclusion clause that does not precisely identify the asset being excluded from accrual.
Later case law also illustrates the distinction between a fundamentally invalid ANC and a narrower dispute about an exclusion clause.
In W.L.F (nee V.F) v R.S.F (Trial-within-a-trial) (2019/15013) [2026] ZAGPJHC 228, the Gauteng High Court considered the validity of an ANC containing disputed future-asset wording and relied on B F v R F (2017/5018A) [2018] ZAGPJHC 699; 2019 (4) SA 145 (GJ) when dealing with the scope of exclusions.
The court nevertheless declared the ANC valid. W.L.F v R.S.F should therefore not be presented as a later application of Bath v Bath; it is better understood as a contrasting example of a drafting dispute that did not invalidate the entire ANC.
The practical lesson is this: a court’s first step is not to ask whether a clause is imperfect.
It is to ask whether the imperfection is so fundamental that the parties’ agreement cannot be established at all, or whether it is a narrower problem capable of being resolved through interpretation.
For the detailed treatment of exclusion-clause disputes specifically, see MVA’s guide to excluding assets from accrual, and to replacement assets excluded from accrual.
Where an ANC contains a problem, the correct legal response depends on what that problem actually is:
A court cannot use rectification to create a new agreement where the original one is genuinely incapable of establishing what the parties agreed — that is the Bath v Bath scenario, and invalidity, not rectification, is the applicable consequence.
No — this is a separate issue from vagueness, and it is a common point of confusion.
An ANC’s validity as between the spouses and its registration are different legal questions. A validly executed but unregistered ANC can still be enforceable between the spouses, even though it may lack force against third parties such as creditors.
This is covered in detail in MVA’s guide to what happens if an ANC is not registered.
Bath v Bath is ultimately a warning about precision, not a reason to fear that any drafting imperfection will unravel an entire contract. In practice:
A validly drafted ANC also does not, by itself, resolve every later question about how the accrual is calculated.
Declaring a commencement value, and correctly applying the rules for a nil or negative commencement value, are separate technical questions from the contract’s validity — covered in MVA’s guides to the commencement-value pages linked below.
Martin Vermaak Attorneys Inc. advises on South African matrimonial property matters, including the drafting, interpretation, and validity of antenuptial contracts, and disputes concerning excluded assets and accrual.
Where an existing ANC’s validity or a specific clause is in doubt, obtaining advice early can help clarify whether the issue is one of interpretation, rectification, or a more fundamental question of validity — since the correct remedy depends on which of these applies.
For related guidance, see MVA’s articles on Antenuptial Contracts South Africa.
Author: Martin Vermaak, B.Proc, LLB
Attorney of the High Court of South Africa | Director, Martin Vermaak Attorneys | Over 20 years’ experience in divorce and family law
Disclaimer
This information has been prepared for general educational purposes only and is not intended to constitute legal, financial, tax or other professional advice. South African family law is fact-specific, and the applicable legal position may depend on the circumstances of the individual matter. Readers should obtain independent professional advice appropriate to their circumstances before making legal, financial or other decisions.
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