At What Age Can You Write a Will in Switzerland?

In Switzerland, an individual must be at least 18 years old (legal majority) to execute a legally binding last will and testament. This statutory requirement is set out in Article 467 of the Swiss Civil Code (SCC): "Any person who has capacity of discernment and is at least 18 years of age has the power to dispose of their property by testamentary disposition." Minors under the age of 18 are completely barred from making a will under Swiss law, and parental consent cannot cure this legal incapacity.

In addition to reaching the age of majority, having capacity of discernment (Art. 16 SCC) at the exact time of drafting is the second mandatory requirement. Individuals suffering from advanced dementia or severe cognitive impairment lack testamentary capacity. A will executed without sound mental capacity can be challenged by statutory heirs in court and declared null and void.

Key Takeaways at a Glance:

Legal Age (Art. 467 SCC): Exactly 18 years of age on the day of writing and signing.
Dual Cumulative Requirement: Both majority and mental capacity of discernment must exist simultaneously.
No Legal Representation: Testamentary drafting is strictly personal; neither parents nor guardians can execute a will on your behalf.
Reviewed and verified under the Swiss Civil Code (2023 Reform) by the onlinedokument.ch Legal Team.

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1. The Legal Requirements for Testamentary Capacity

For a will to be upheld in Swiss probate proceedings, two cumulative conditions must be satisfied:

1. Majority (Age 18): A document drafted before the testator's 18th birthday is legally invalid from inception. It does not automatically gain validity upon turning 18 and must be redrafted and signed anew.
2. Capacity of Discernment (Art. 16 SCC): The testator must be capable of understanding the legal nature, scope, and consequences of their testamentary dispositions. While mental capacity is generally presumed under Swiss law, medical evidence of cognitive incapacity can be used by aggrieved heirs to overturn the document.

Legal Status	Testamentary Capacity	Statutory Basis
Minors under 18 years	No (strictly prohibited)	Art. 467 SCC
Adults (18+) of sound mind	Yes (full capacity to test)	Art. 467 & Art. 14 SCC
Adults under curatorship	Yes, if possessing discernment	Strictly personal right (Art. 19c SCC)
Incapacitated / Dementia	No (will is contestable)	Action for annulment (Art. 519 SCC)

Expert Tip: To safeguard your estate from disputes, check our comprehensive guide on how to contest a will in Switzerland and whether witnesses are needed for a Swiss will.

2. Strictly Personal Nature of Wills

Under Swiss jurisprudence, testamentary disposition is an indivisible, strictly personal right. No proxy, family member, or power of attorney holder can draft a will on your behalf. To protect yourself in medical emergencies, pair your will with an Advance Healthcare Directive and a General Power of Attorney.

3. Step-by-Step Instructions

Step 1: Confirm Age Requirement: Ensure the will is drafted on or after your 18th birthday.
Step 2: Use an Attorney-Verified Guide: Use onlinedokument.ch's Swiss guide to format your wishes.
Step 3: Write 100% by Hand: In compliance with Art. 505 SCC, write out the entire document by hand, add the current date (day, month, year), and sign it.

Frequently Asked Questions

Can a 17-year-old make a will with parental permission?

No. Article 467 SCC strictly requires turning 18. Parental or guardian consent cannot grant testamentary capacity to a minor.

Is there an upper age limit to writing a Swiss will?

No, there is no maximum age limit as long as the testator remains of sound mind and possesses capacity of discernment at the time of writing.

What if an elderly testator suffers from mild memory loss?

If they possess lucid intervals where they fully understand the consequences of their estate disposition, the will is valid. Obtaining a doctor's certificate on the day of signing is strongly recommended.