When is a Will Invalid in South Africa?

A will is invalid in South Africa if the testator lacked testamentary capacity at the time of execution, the formalities set out in sections 2 and 3 of the Wills Act 7 of 1953 were not observed, the testator was unduly influenced or acted under fraud or force, the will was forged, or — in limited circumstances — the will was revoked. Some defects make the will void (it has no legal effect from the outset, as if it never existed), while others make it voidable (valid until a court sets it aside on challenge by an interested party). The distinction matters because a void will does not need to be challenged, while a voidable will stands until someone with standing brings a formal challenge in court.

The Two Categories: Void vs Voidable

South African succession law treats defective wills as falling into one of two categories, and knowing which one applies is the first question a practitioner, executor, or family member has to settle.

Feature	Void will	Voidable will
Legal status from outset	No legal effect — treated as if it never existed	Valid on its face until a court sets it aside
Action required to remove it	None — the prior will or intestate succession applies automatically	An interested party must bring a court application
Can it be ratified by conduct?	No — it cannot be cured by acceptance	Yes — may be confirmed, for example, by a beneficiary accepting benefit under it
Typical examples	Will signed by a testator wholly without capacity; will never signed at all; will procured by forgery or fraud	Will procured by undue influence; will made under a material mistake; will made during “hurry” induced by another

The distinction is not merely academic. A void will falls away automatically — there is nothing to challenge, and the Master’s office can be notified of the defect so that the prior will or intestate succession takes effect. A voidable will operates in the meantime, and assets can be distributed under it unless and until a challenger successfully brings court proceedings. The Master’s office will not accept a will for lodging if the defect appears on its face; where a doubtful will has been accepted, the Master may refer the matter to the High Court for a declaratory order.

Formal Non-Compliance: When the Will Itself Was Not Properly Made

Section 2 of the Wills Act 7 of 1953 sets out the ordinary formalities for a will executed by a person who can read and write. The will must be:

• signed at the end by the testator (or by someone signing at the testator’s direction and in the testator’s presence, with a Commissioner of Oaths present to witness the testator’s mark or instruction);
• in the presence of two or more competent witnesses who are present at the same time;
• the witnesses must then sign the will in the presence of the testator and of each other.

Section 3 governs wills made by persons who cannot read or write (or who are blind or illiterate): the testator must sign a mark in the presence of the Master of the High Court or a notary public, two competent witnesses, and a person able to read and write.

Common practical failures that invalidate a will on this ground include missing witness signatures, witnesses signing at different times or places, and the testator signing before the witnesses do. A will that fails a formal requirement is generally void, not merely voidable. One important softening: section 2(3), inserted by the Law of Succession Amendment Act 43 of 1992, allows a court to condone non-compliance if it is satisfied that a document was intended by the deceased to be their will — a discretion the Supreme Court of Appeal has exercised in cases such as Van der Merwe v Master of the High Court (2010), where an unsigned electronic document was accepted on the strength of the deceased’s clear intention.

Lack of Testamentary Capacity

A person making a will must be capable of appreciating the nature of the act, the extent of their estate, the claims of those who might reasonably expect to benefit, and of formulating a rational testamentary scheme. The standard is the same as under Roman-Dutch law and is set out in long-standing case law — the test from Banks v Goodfellow (1870) remains the authoritative South African formulation, requiring the testator to have a “sound and disposing mind and memory… sufficiently sound to enable him to know… the business in which he was engaged.”

Capacity is judged at the time the will was executed — not at earlier or later dates. A person with dementia may still have capacity on a lucid day. The Supreme Court of Appeal and provincial divisions have repeatedly held that old age, illness, or eccentricity are not on their own sufficient to strip capacity (Essop v Mustapha 1988). Medical evidence from a psychiatrist, neurologist, or geriatrician is the usual way capacity is established or challenged. A will made without capacity is void.

Fraud, Forgery, and Undue Influence

Three distinct, but often conflated, vitiating factors appear in this area. The legal consequences, and who bears the burden, are different for each.

Ground	What it means	Effect on the will
Fraud	Misrepresenting facts to the testator (e.g. telling them a family member is dead when they are alive) so as to induce a particular disposition	Void
Forgery	The testator’s signature was placed by another person without authority — see, for example, Pillay v Nagan 2001 and Molefi v Nhlapo 2013	Void; the forger and their heirs take nothing under the maxim “de bloedige hand neemt geen erf”
Undue influence	Pressure that overbears the testator’s independent will, so the will reflects the wishes of the influencer rather than those of the testator	Voidable at the instance of an interested party

The distinction between “persuasion” (which is lawful) and “undue influence” (which is not) is fact-specific. A family member who encourages, suggests, or even strongly requests a particular disposition does not thereby invalidate the will — the conduct must amount to “coercion or fraud” that displaces the testator’s volition (Spies NO v Smith 1957). Courts weigh the testator’s mental state, the closeness of the relationship, whether the result was out of character, and whether the testator had an opportunity to reflect or alter the will after execution. Bare suspicion is not enough (Katz v Katz 2004).

Revocation

A will can be revoked in three ways under the Wills Act:

1. Express revocation by a later will — the later will may expressly revoke the earlier one, or it may do so inconsistently, in which case the earlier will is revoked only to the extent of the inconsistency.
2. Deliberate destruction of the will with the intention to revoke it — for example, by burning, tearing, or otherwise cancelling it.
3. Marriage — marriage generally revokes an existing will, subject to limited statutory exceptions.

Divorce does not revoke the will as a whole. It revokes only the bequest to the former spouse, who is treated for the purposes of the will as if they had predeceased the testator. The rest of the will stands.

Other Grounds Set Out in the Wills Act

• A will made during a period of insanity (section 4) — void.
• A will made under the influence of “hurry” induced by another person — voidable.
• A will that benefits a witness or the spouse of a witness (section 4A) — the bequest fails, but the will itself remains valid. The Supreme Court of Appeal confirmed in Blom v Brown (2011) that this disqualification applies regardless of family relationship.

Who Can Challenge and Within What Timeframe

An interested party with standing to challenge a voidable will includes a beneficiary under a prior will, an heir ab intestato, a dependent who would inherit on intestacy, and a creditor of the estate. The general presumption, however, is that a will that appears regular and complete is valid — the onus rests on the challenger to prove invalidity on a balance of probabilities (Kunzs v Swart 1924 AD 618), and this is generally difficult to discharge.

The Master’s office will not accept a will for lodging if it appears on its face to be invalid. If the Master accepts a doubtful will, an interested party must bring a court application to have it set aside; alternatively, the Master may refer the matter to the High Court for a declaratory order. Prescriptive time limits apply, and delay can be fatal: a beneficiary who accepts benefit under a voidable will may be taken to have confirmed it. Where a will is invalid, the estate devolves according to the Intestate Succession Act 81 of 1987, subject to a maintenance claim by a surviving spouse under the Maintenance of Surviving Spouses Act 27 of 1990 or by minor children.

Practical Steps if You Suspect a Will Is Invalid

1. Obtain a copy of the will and any prior will from the Master’s office (the Master’s records are accessible to interested parties on application).
2. Identify the specific defect — formal non-compliance, capacity, fraud, undue influence, or revocation — rather than approaching the problem in general terms.
3. For a voidable will, approach an attorney promptly. Delay can result in the will being acted on and assets distributed, which complicates a later challenge and may trigger ratification by conduct.
4. For a void will, no court challenge is needed; advise the executor and the Master’s office of the defect so that the prior will or intestate succession can take effect.

The Wills & Estates practice at Burger Huyser Attorneys routinely handles will-drafting, will-review, deceased estate administration, and estate-tax planning across all nine Gauteng branches — the kind of fit that matters when the line between void and voidable, or between formal defect and substantive challenge, has to be drawn quickly and on the available evidence.

If you have a concern about the validity of a will — whether one you have been asked to act under, or one that should have made provision for you — Burger Huyser Attorneys’ Wills & Estates practice can review the document, advise on whether it is void or voidable, and where appropriate assist in lodging a challenge with the Master of the High Court or bringing a court application. Contact the head office in Linden, Randburg on 011 888 0246 (or the branch nearest you) to book an initial consultation. Burger Huyser Attorneys carries a 4.8/5 average across 250+ Google reviews (Trustindex verified “Top Rated Law Firm in South Africa”) and handles wills, deceased estate administration, and estate-tax planning across all nine Gauteng branches.

Frequently Asked Questions

What makes a will legally invalid in South Africa?

A will is invalid if the testator lacked testamentary capacity at the time of execution, the formalities of sections 2 or 3 of the Wills Act 7 of 1953 were not observed, the will was procured by fraud, forgery, or undue influence, the testator was insane at the time (section 4), or the will was validly revoked. Some defects make the will void (it has no legal effect from the outset); others make it voidable (valid until a court sets it aside on challenge).

Is a will invalid if it isn’t signed by witnesses?

Yes. Section 2 of the Wills Act 7 of 1953 requires the will to be signed by the testator at the end in the presence of two or more competent witnesses, who must then sign the will in the presence of the testator and of each other. A will that does not meet these formalities is generally void, not voidable, and does not need to be challenged. A court may, however, condone non-compliance under section 2(3) if it is satisfied the document was intended as the testator’s will.

Can a will be contested because of dementia?

A will can be set aside on the ground of lack of testamentary capacity if the testator did not, at the time of execution, appreciate the nature of the act, the extent of their estate, the claims of those who might reasonably expect to benefit, and could not formulate a rational testamentary scheme. Medical evidence is typically required to establish or refute capacity, and the question is judged at the time the will was signed, not at earlier or later dates. Old age or illness alone is not enough to strip capacity.

What’s the difference between undue influence and persuasion?

Persuasion — including a family member encouraging, suggesting, or even strongly requesting a particular disposition — is lawful and does not invalidate a will. Undue influence requires pressure that overbears the testator’s independent will, so that the will reflects the wishes of the influencer rather than those of the testator. The closer the relationship and the more out-of-character the result, the more readily courts draw that inference. A will procured by undue influence is voidable, not automatically void.

Does getting divorced invalidate a will?

No — divorce does not revoke the will itself under the Wills Act 7 of 1953. It does, however, revoke any bequest to the former spouse, who is treated for the purposes of the will as if they had died before the testator. The rest of the will stands.