In almost every state, a will has to be witnessed to be valid, and it does not have to be notarized. The standard is two competent adult witnesses who watch you sign and then sign themselves. Notarization is optional, and it serves a separate purpose: it makes a self-proving affidavit that speeds up probate. Mixing up these two roles is one of the most common mistakes in do-it-yourself estate planning.
What the Witnesses Actually Do
Witnesses do something a notary cannot. They observe your mental state at the moment of signing. They confirm that you appeared to understand the document, that no one was pressuring you, and that you declared it to be your will. If someone later claims you were confused or coerced, those witnesses are the first line of defense.
The near-universal rule is two witnesses. They must be present at the same time and must either watch you sign the will or hear you acknowledge that the signature is yours. Each witness then signs the will in your presence. This simultaneous-presence requirement is where many homemade wills fall apart. Having your neighbor sign on Tuesday and your coworker sign on Thursday does not satisfy the requirement in most states, even though two people technically signed.
About 17 states have fully adopted the Uniform Probate Code, and many others borrow from it. Under the current UPC, a witness must sign within a “reasonable time” after watching you sign or acknowledge the will, which is more forgiving than the older single-ceremony rule. Even in UPC states, the safest practice is still to have everyone sign together in one sitting.
Who Can Serve as a Witness
A witness must be a legal adult who is mentally competent enough to understand what they are observing. Beyond that, the most important rule is that your witnesses should be “disinterested,” meaning they do not stand to inherit anything under the will.
What happens if a beneficiary accidentally serves as a witness depends on the state. Under the UPC, an interested witness does not invalidate the will or the gift. Many non-UPC states are harsher: the will survives, but the gift to the witness-beneficiary is voided unless enough other disinterested witnesses also signed. The practical rule is simple. Never ask someone named in your will to witness it. Ask a neighbor, a coworker, or anyone else with no financial stake in your estate.
Can a notary public serve as a witness? In most states, yes, but not while also performing the notarization on the same document. The notary picks one role. If your notary signs as a witness, you still need a second witness, and you will need a different notary if you also want a self-proving affidavit.
Why a Notary Stamp Alone Is Not Enough
A notary public verifies your identity and confirms that you signed voluntarily. That is the whole job. A notary does not assess your mental capacity, does not watch you declare the document as your will, and does not perform the evidentiary function witnesses perform. A will with a notary stamp but no witnesses is invalid in the vast majority of states.
There is one wrinkle. The 2008 revision to the UPC added an alternative: a will can be valid if it is either witnessed by two people or acknowledged before a notary. Under that version, notarization alone could satisfy execution. Most states have not adopted this specific provision, and relying on it is risky unless you have confirmed your state follows the 2008 revision. The traditional two-witness rule remains the safe default nationwide.
One state stands apart in requiring notarization as part of standard will execution, with a notary signing alongside two witnesses and the testator. If you live there, you almost certainly know it, because the probate system operates differently from the rest of the country. Everywhere else, notarization is optional for the will itself.
The Self-Proving Affidavit: Where the Notary Matters
The will itself does not need notarization, but a separate document usually attached to it does, and skipping it creates real headaches during probate. A self-proving affidavit is a sworn statement in which you and your witnesses declare under oath that the signing formalities were followed. A notary administers the oath, then signs and stamps the affidavit.
Without this affidavit, the probate court has to track down your witnesses after you die and get them to testify that the signing happened correctly. If a witness has moved, become incapacitated, or died, this can stall probate for months. A self-proving affidavit eliminates that step. The court accepts the notarized affidavit as proof that your will was properly executed, and the process moves forward without live witness testimony.1Legal Information Institute (LII) / Cornell Law School. Self-Proving Will
A few states allow witnesses to sign statements under penalty of perjury instead of requiring a notarized affidavit. In most states, though, the affidavit requires notarization. This connection is what leads so many people to believe, incorrectly, that the will itself must be notarized.1Legal Information Institute (LII) / Cornell Law School. Self-Proving Will
The cost is minimal. Notary fees for a standard acknowledgment run roughly $2 to $25 depending on where you live, and many banks and credit unions offer free notary services to account holders. Given the probate delays a missing affidavit can cause, there is no good reason to skip it.
Handwritten Wills: The Main Exception
About 26 states recognize holographic wills, meaning wills written entirely in the testator’s own handwriting. These are the main exception to the witness requirement. If you write out your will by hand and sign it, it can be valid in those states without any witnesses.
The requirements are strict. The material terms, meaning who gets what, must be in your handwriting rather than typed or printed. Some states require the entire document to be handwritten, while others only require the “material portions” to be. A holographic will also cannot have a self-proving affidavit attached, since there are no witnesses to swear one, so probate courts have to verify the handwriting through other evidence, often handwriting experts or people familiar with your writing.
Holographic wills work, but they invite challenges. If you have the time and resources to execute a witnessed will, that is always the stronger choice.
Electronic Wills and Remote Notarization
A small but growing number of states allow electronic wills that are created, signed, and stored digitally. As of mid-2025, roughly seven states plus the District of Columbia have adopted the Uniform Electronic Wills Act, and a few other states have enacted their own e-will statutes.
Electronic wills still require witnesses, but the mechanics differ. Many e-will statutes allow witnesses to attend through a live audio-video connection rather than being in the same room. The notarization for the self-proving affidavit can often be handled through remote online notarization, where the notary verifies your identity and administers the oath over a recorded video call.
Some states that allow e-wills require the document to be stored by a “qualified custodian,” a person or entity that maintains a secure system for preserving the will and its records and delivers it to the probate court after your death. That storage requirement is unique to electronic wills.
If you are considering an electronic will, confirm your state has actually enacted e-will legislation. An electronic document that does not comply with your state’s execution rules is a PDF, not a will.
What Happens If You Get Execution Wrong
A will that fails to meet your state’s signing and witnessing requirements can be declared invalid. The probate court then ignores the document entirely, and your estate passes as though you died without a will. That triggers intestacy laws, which distribute property by a fixed formula based on family relationships. Spouses and children usually get priority, but the split may look nothing like what you intended, and unmarried partners, close friends, stepchildren, and charities get nothing.
About a dozen states have adopted some version of a “harmless error” rule, which lets a court validate a will that does not strictly comply with execution formalities if there is clear and convincing evidence you intended the document to be your will. That is a high bar. It gives courts flexibility to save a will with a technical defect, like a missing witness signature, but it is not something to plan around. Outcomes are unpredictable, and litigation to invoke the rule costs the estate money that would otherwise go to your beneficiaries.
The far better approach is to get the execution right the first time: two disinterested witnesses, everyone signing together, and a notarized self-proving affidavit attached.