When drafting a last will, diligence is everything. A common oversight is forgetting to insert the date of execution. While it might seem like a minor administrative detail, a missing date can trigger severe legal battles and financial strain for your family after you pass away.

1. What the Law Says: Is an Undated Will Valid?

In South African law, a will without a date is still legally valid. According to the Wills Act 7 of 1953, including a date is not one of the strict statutory formalities required to make a will legally binding, if the document meets the actual legislative requirements.

However, just because an undated will is valid does not mean you cannot experience problems in the future. We discourage all clients from leaving out a date on their Will, because there can be complications during the estate administration process.

2. The General Consequences of an Undated Will

Leaving a date off a will leaves your estate highly vulnerable to administrative hurdles and expensive litigation:

• The "Which Will is Latest?": Most wills contain a standard clause revoking all previous wills. If you have signed multiple wills over your lifetime, the Master of the High Court needs to know which one is the latest, as the most recent valid will supersedes all others. Without a date, it becomes exceptionally difficult to prove which document is your final directive.
• Costly High Court Litigation: If family members or intended beneficiaries disagree over when the will was executed, they may have to approach the High Court to determine its timeline. The court will have to rely on expensive extrinsic evidence (like witness testimonies or digital metadata). These legal fees are typically deducted directly from your estate, leaving less money for your loved ones.
• Delays in Winding Up the Estate: The Master of the High Court must formally accept the will before an executor can begin distributing assets. If the Master flags an undated document, the administration process will come to a halt, leaving your family waiting months or years for financial relief.
• Reversion to Intestate Succession: If the undated will is heavily contested and the court cannot confidently establish when it was signed—or if it conflicts irreconcilably with a dated will—it may be rejected. If you have no other valid will, your estate will be distributed according to the Intestate Succession Act 81 of 1987, meaning the law, not your personal wishes, decides who gets your assets.

3. The Date's Critical Role in Mental Capacity Disputes

The danger of an undated will increases dramatically if a family member or disgruntled heir disputes whether the testator had the required mental fitness (testamentary capacity) to manage their own affairs.

Under Section 4 of the Wills Act, a person is presumed mentally capable of making a will unless proven otherwise. Crucially, the law states that the lack of capacity must exist "at the time of making the will." When this is challenged, the exact date of signing becomes the absolute focal point of the legal battle.

Pinpointing the "Decisive Moment"

Where the question arises as to whether a person had the capacity to make a will, the mere fact of old age or illness does not necessarily mean that a person is incapable of appreciating the effect of the will he or she is executing, as stated in Essop v Mustapha and Essop NNO and Others 1988 (4) SA 213 (D). In the Essop case, the court confirmed that the decisive moment for establishing the competence of the testator is the time when the will was made and not, for example, when the deceased had issued instructions for drawing up the will.

If the will is dated, medical records, hospital admissions, and expert opinions from that specific day or week can be cross-referenced to prove whether the testator was lucid.

If the will is undated, it becomes almost impossible to anchor medical evidence. A court cannot accurately evaluate the testator’s state of mind if it cannot determine when that mind was being expressed.

Navigating "Lucid Intervals" (Dementia and Illness)

Cognitive decline, Alzheimer’s, or severe medical treatments do not automatically invalidate a will. The law recognizes that a person suffering from mental illness or dementia can experience "lucid intervals"—temporary windows where their confusion clears, and they fully appreciate what they own and who their heirs are.

• The Date as a Shield: If a family claims the testator had advanced dementia, a specific date allows the executor to prove the will was signed during a documented period of stability or medical recovery.
• The Undated Trap: Without a date, the family challenging the will can easily argue that the document was signed during a period of complete incapacity, forcing the estate into an uphill battle to prove a "lucid interval" occurred at some mystery point in time.

Cross-Referencing Medical and Legal Timelines

An explicit date on a will allows legal teams to match the signing against critical milestones to see if the testator was fit to manage their affairs. Courts look closely at:

• Medical Diagnoses: Was the will signed before or after a stroke, or a severe diagnosis that impaired cognitive function?
• Heavy Medication: Was the testator under the influence of mind-altering sedatives or painkillers in a hospital on that specific day?
• Curatorship: Was the will signed after a High Court had already officially declared the person incapable of managing their affairs and appointed a curator?

The Burden of Proof Shift

In South Africa, the burden of proof rests entirely on the person alleging that the testator lacked mental capacity. They must prove on a balance of probabilities that the testator was not of sound mind when they signed.

However, leaving a will undated inadvertently hands a massive advantage to the challengers. It allows them to introduce a broad, generalized timeline of the testator's mental decline. The executors of the will are then left trying to prove a negative—that the testator was not confused on a day they cannot even identify.

In Thirion v Die Meester en Andere 2001 (4) SA 1078 (T) the court declared that the consumption of alcohol cannot invalidate juristic acts, such as drawing up a will.