GermanyWhat is testamentary capacity and when can it be challenged?
Testamentary capacity (Testierfähigkeit) in Germany means being at least 16 years old and mentally capable of understanding the nature and consequences of making a will. It can be challenged if the testator lacked mental clarity due to illness, dementia, or impaired consciousness at the time.
What the Law Says
German law defines who can make a valid will—and when that ability can be legally questioned. The core rule is in § 2229 of the German Civil Code (BGB).
Under German law, testamentary capacity (Testierfähigkeit) has two main requirements: age and mental competence. A person must be at least 16 years old to make a will—and no parental or guardian consent is required, even for minors aged 16–17.
More critically, the testator must be mentally capable at the exact time the will is made. This means they must understand what a will is, who their heirs are, what assets they own, and the legal effect of their decisions. Temporary confusion, severe dementia, psychosis, or unconsciousness can all undermine this capacity.
Importantly, the law does not require a formal medical diagnosis—but if mental impairment is alleged, courts rely heavily on medical records, witness testimony, and expert assessments from the time the will was signed.
Statutory TextEin Minderjähriger kann ein Testament erst errichten, wenn er das 16. Lebensjahr vollendet hat.
— BGB § 2229 (1) — German Civil Code
Statutory TextDer Minderjährige bedarf zur Errichtung eines Testaments nicht der Zustimmung seines gesetzlichen Vertreters.
— BGB § 2229 (2) — German Civil Code
Statutory TextWer wegen krankhafter Störung der Geistestätigkeit, wegen Geistesschwäche oder wegen Bewusstseinsstörung nicht in der Lage ist, die Bedeutung einer von ihm abgegebenen Willenserklärung einzusehen und nach dieser Einsicht zu handeln, kann ein Testament nicht errichten.
— BGB § 2229 (4) — German Civil Code
What Courts Have Said
German courts assess testamentary capacity case-by-case, focusing on the testator’s mental state at the moment the will was executed—not general health or diagnosis alone.
The court confirmed that a diagnosis of dementia alone doesn’t automatically void a will—but if medical evidence shows the testator lacked insight into the meaning and consequences of their will at the time of signing, the will is invalid.
What to Do
Gather medical records, pharmacy logs, and witness statements from around the time the will was signed.
File a challenge in probate court (Nachlassgericht) within the statutory deadline—usually before the estate is distributed.
Request a court-ordered psychiatric evaluation if capacity is disputed but no contemporaneous medical evidence exists.
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Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: June 2026.