Any adult of sound mind who gets nothing under your will can witness it. That is the whole rule in one sentence, and it is also the answer to the question of who can witness a will: two people, 18 or older, mentally competent, and with no financial stake in what the document says. Everything else is detail about why certain choices are safer than others.
The Baseline Requirements
A witness has to clear three low bars. They must be old enough, they must be mentally competent, and there must be at least two of them.
The age floor is 18 in the vast majority of jurisdictions. A small number of states allow witnesses as young as 14, but using someone under 18 creates needless risk. If the will is later probated in a state with a higher threshold, or if the witness’s maturity is questioned during a contest, an underage signature becomes a liability.
Mental competence is a modest standard. The witness does not need legal training, and they do not need to read the will or know its contents. They need to understand that the person in front of them is signing a will and appears to be doing so voluntarily. Their job is to confirm the event, not evaluate it.
Every state requires at least two witnesses for a standard attested will. No state requires three. Louisiana is the only jurisdiction that also requires a notary public to be present for will execution.
Who You Should Not Ask
The single most important rule in choosing witnesses is to pick people who inherit nothing. A witness who stands to gain under the will is called an “interested witness,” and this is the most common witnessing mistake in estate planning.
Beneficiaries
If a person named in your will also signs as a witness, most states will not throw out the entire document. They go after the gift instead. The usual approach is a “purging” rule: the bequest to the interested witness is voided, and those assets pass as if the witness had been left out. Some states take a slightly softer line and create a rebuttable presumption of undue influence, which the witness can overcome only by proving they did not pressure the person making the will. Either way, the inheritance is in serious jeopardy.
Many states include a safety valve: if two other disinterested witnesses also signed, the interested witness’s gift may survive. But relying on that exception means recruiting three or more witnesses to do the work of two, for no good reason. The clean answer is to keep every beneficiary off the witness line.
Spouses of Beneficiaries
A beneficiary’s spouse is almost as problematic as the beneficiary. Many states treat the spouse of someone who inherits the same way they treat the heir, which means the gift can still be purged. The reasoning is obvious: a spouse has a plain indirect financial interest. Even in states that do not explicitly disqualify a beneficiary’s spouse, choosing one invites exactly the kind of challenge you are trying to prevent.
Executors and Trustees
Someone you have named as executor or trustee is technically allowed to witness in most states. Being appointed to administer an estate is not the same as receiving a gift from it; executor compensation comes from administration, not from a bequest.
Even so, many estate planning attorneys advise against it. If your executor is also a family member who inherits, they are an interested witness regardless of their executor role. And a purely disinterested executor-witness still creates an optic problem. If someone contests the will, a witness who also runs the estate looks overly involved. Pick someone else when you can.
The Notary Question
In most states a notary can serve as one of your two witnesses, provided they meet the age and competence requirements and have no interest in the will. The complication arises when the same signing produces a self-proving affidavit, because a notary generally cannot notarize their own signature. If the notary also signed as a witness, they would be notarizing a document they signed, which is prohibited in many states. The simple fix is to let the notary notarize and bring in two other people to witness.
What Happens If You Pick the Wrong Person
Choosing a bad witness rarely destroys a will outright, but it can destroy the gift to that witness and drag the estate into litigation. Purging statutes strip the bequest. Rebuttable-presumption states force the witness to defend themselves against an undue influence claim they may not win. In either case, you have handed your heirs delay, expense, and a courtroom fight that proper witness selection would have avoided entirely.
Problems that run deeper than witness identity, such as too few witnesses or witnesses who were not actually present for the signing, can go further and keep the will out of probate altogether. Some states have adopted a “harmless error” rule that lets courts save a defective will when there is clear and convincing evidence of the person’s intent, but that doctrine is not universal, and relying on it is a gamble when getting the signing right is straightforward.
How to Pick Witnesses in Practice
The legal bar is low. The practical bar should be higher, because the witnesses you choose today may need to be found, questioned, or asked to testify years from now.
- Pick people younger than you. A witness has to still be around, and still competent, if probate requires their testimony.
- Pick people who live nearby and have stable lives. A long-time neighbor, a colleague, or a professional contact is easier to track down than a casual acquaintance who moves often.
- Avoid anyone connected to your estate plan. No beneficiaries, no spouses of beneficiaries, and ideally no one you have named to administer the estate. The further removed the witness, the more credible they look if a challenge arises.
- Add a self-proving affidavit at the same signing. It is a sworn statement, notarized at the time of execution, in which you and the witnesses confirm under oath that the signing met every legal requirement. The affidavit does not make the will more valid, but it lets the probate court accept the will on the sworn statements alone instead of hunting down witnesses later. Nearly every state recognizes them, and there is no good reason to skip one.
If the person making the will does not speak English, a certified translator should be present during execution. Family members should not translate, because their involvement can be recharacterized later as undue influence. Having the translator sign a separate affidavit describing what was communicated adds another layer of protection.
The most reliable setup is to sign in an attorney’s office using two of the attorney’s staff members as witnesses, with a notary handling the self-proving affidavit. The staff members are disinterested, experienced, and professionally motivated to follow every step. It is not the only way to execute a valid will, but it is the one least likely to produce surprises.
When the Question Changes
Not every will needs witnesses. Roughly half the states recognize holographic wills, which are handwritten, signed by the person making the will, and valid with no witness signatures at all. The important terms must be in the person’s own handwriting, and some states also require a date. Holographic wills are far more vulnerable to challenge than attested wills, because there is no one to confirm identity, mental state, or voluntariness, but in the states that accept them they are legal.
Electronic wills shift the question in a different direction. As of early 2026, roughly 16 states have enacted electronic will legislation, many based on the Uniform Electronic Wills Act. These laws permit digital signatures and electronic storage while preserving the two-witness requirement. Whether witnesses can appear by live audio-video rather than in the same room depends on the state: some that adopted the act included remote witnessing, others explicitly excluded it. Several pandemic-era executive orders authorized remote witnesses temporarily, and most of those have expired. If you are signing electronically, confirm both that your state recognizes electronic wills and that it permits whatever form of witness presence you plan to use. Getting that wrong produces a document that looks modern and is legally worthless.