Short answer: A California will is valid when the person making it (the testator) is at least 18 and of sound mind, the will is in writing, the testator signs it or directs someone else to sign it in their presence, and two witnesses who are present at the same time watch the signing (or the testator’s acknowledgment of the signature) and then sign the document themselves. Skip any one of those elements and the will can be thrown out in probate. If that happens, the estate passes under California’s intestate succession statutes, Probate Code § 6400, instead of the terms the testator actually wanted.
What does California actually require for a will to be valid?
Four things have to be true at the same time. The testator must be 18 or older. The testator must be of sound mind, meaning they understand generally what they own, who their close family members are, and that the document they are signing is a will. The will must be in writing (California does not recognize an oral will for general estate distribution). And it must be signed, either by the testator or by someone else acting at the testator’s direction and in the testator’s presence.
None of these requirements are complicated on their own. Where wills actually fail is in the execution, meaning the signing and witnessing, not in the drafting.
Do I need witnesses, and does it matter who they are?
Yes. California requires two witnesses, and they need to be present at the same time when the testator signs or acknowledges the will as their own. The witnesses then sign the will themselves, in the testator’s presence. A witness does not need to read the contents of the will or know what it says. They only need to understand that they are watching someone sign a document that person is calling their will.
Who you choose as a witness matters more than people assume. A witness who also stands to inherit under the will is treated differently than a witness with nothing to gain from it, and that distinction can become a problem if the will is later contested. The safer, and far more common, practice is to use two witnesses who are not beneficiaries and have no financial stake in the outcome.
Is a handwritten will without witnesses valid in California?
California recognizes holographic wills: a will that is entirely handwritten and signed by the testator, without any witnesses at all. The catch is that the material terms, meaning who gets what, and the signature need to actually be in the testator’s own handwriting. A typed document with a handwritten signature is not a holographic will. Holographic wills can work in a pinch, but they are far more prone to ambiguity and challenge than a properly witnessed will, because there is no one who watched the signing and can testify to the testator’s intent and capacity.
What happens if the signing or witnessing goes wrong?
A will that is signed but not properly witnessed, or witnessed by only one person, or where the witnesses were not present at the same time, is vulnerable. It may be rejected in probate entirely. If that happens and there is no earlier valid will to fall back on, the estate is distributed under California’s intestate succession rules rather than the testator’s actual wishes. This is exactly the outcome a will is supposed to prevent, and it is why the signing itself, not just the drafting, deserves attention.
Capacity issues create a similar risk. A will signed by someone who did not understand what they owned or what they were signing can be challenged after death, when the person who could explain their intent is no longer available to do so.
Does having a valid will mean my estate skips probate?
No. A will, even a perfectly valid one, does not avoid probate. It only takes effect once a court validates it through the probate process. If avoiding court supervision of your estate matters to you, that requires a properly funded revocable living trust, not just a will. A will and a trust solve different problems, and a lot of confusion comes from assuming a signed will alone keeps an estate out of court.
What to do next
If your will was signed years ago, or you are not certain the signing and witnessing were done correctly, do not assume it will hold up. Life events like marriage, divorce, a birth, a death in the family, or a significant change in what you own are all good reasons to have the document reviewed rather than guessed at. An estate planning attorney can confirm your existing will was properly executed, or draft a new one that will be, as part of a broader estate plan.
Figures verified July 2026.
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