A will that does not meet your state's execution requirements is not a will. It is a piece of paper with no legal effect. The the will-maker's intent, however clearly expressed, does not matter if the document was not properly signed and witnessed. Courts apply execution requirements strictly, which means a will that was prepared carefully and expresses exactly what the person making the will wanted can be thrown out entirely because the wrong person served as a witness or because the signatures were not in the right order.
Execution requirements are not complicated, but they vary by state in ways that catch people off guard. Here is what makes a will legally valid and where the states most commonly diverge.
The universal requirements
Every U.S. state shares a small set of requirements that apply to all validly executed wills.
The will must be in writing. Every state requires a written document. Oral wills are not recognized for general estate planning purposes in any state, though a narrow category of oral wills called nuncupative wills exists in a handful of states under highly specific circumstances, typically involving members of the military in active service or people who are on the verge of death with no time to prepare a written document. For any will intended to distribute real estate or significant personal property, a written document is required without exception.
The person making the will must sign the will. The signature must be the the will-maker's own. Most states require the signature to appear at the end of the document. Some states allow a signature anywhere on the document but signing at the end eliminates any ambiguity about which portions of the document the person making the will intended to authenticate. If the person making the will is physically unable to sign, most states allow another person to sign at the the will-maker's direction and in their presence, provided the circumstances are clearly documented.
The person making the will must have legal capacity. This means two things: the person making the will must be of legal age, which is 18 in most states, and the person making the will must have testamentary capacity at the time of signing. Testamentary capacity requires that the will-maker understands they are making a will, knows the general nature and extent of their property, recognizes their natural heirs, and understands how the document distributes their estate. This is a lower bar than general legal competency. People with dementia, serious illness, or cognitive decline may still have testamentary capacity during periods of clarity.
The will must be witnessed. Every state except Louisiana requires at least two adult witnesses. The witnesses observe the person signing and then sign the will themselves, attesting to the execution. Some states require three witnesses. Most states require the witnesses to sign in the presence of the will-maker, though a handful allow witnesses to sign after the person making the will has signed as long as the execution is part of a continuous transaction.
Witness requirements: who can and cannot serve
Witness eligibility rules are where execution problems most commonly arise. Most states disqualify interested witnesses, meaning people who stand to benefit under the will, though the consequences of using an interested witness vary significantly by state.
In some states, a will witnessed by an interested party is entirely void: the document has no legal effect at all. In others, the will remains valid but the interested witness forfeits their bequest. In still others, the interested witness can inherit only up to the amount they would have received if the person had died without a will (their intestate share). The safest approach everywhere is to use witnesses who have no financial connection to the the will-maker's estate: neighbors, colleagues, friends who are not named in the will.
Most states also disqualify the following categories from serving as witnesses: minors, people who are themselves incapacitated, and sometimes the notary who notarizes the self-proving affidavit (though this varies). In states that require witnesses to be present at each other's signatures as well as the the will-maker's signature, the entire execution ceremony must happen in one continuous session with all parties present.
Notarization: required in some states, optional in others
Notarization is not a standard requirement for will validity in most states. The two-witness requirement is the core execution standard, and notarization is separate from that. However, notarization becomes relevant in two important contexts.
A self-proving affidavit is a notarized statement, signed by the will-maker and witnesses at the time of execution, attesting that the will was properly executed. Most states allow wills to include a self-proving affidavit, and doing so streamlines the probate process significantly. Without a self-proving affidavit, the probate court may require the witnesses to appear and testify about the execution, which can be difficult years later when the witnesses may have moved, died, or simply forgotten the details. With a self-proving affidavit, the court accepts the will without witness testimony. Most estate planning attorneys include this as a standard feature of every will they draft.
A handful of states go further. Colorado and North Dakota allow a will to be self-proved by notarization alone, without the traditional two-witness requirement, if the will-maker signs the will before a notary who completes the appropriate acknowledgment language. Louisiana operates under an entirely different civil law system and has its own will execution requirements, including a notarized will option.
How the major states handle execution
California requires two witnesses who sign in the presence of the will-maker. The witnesses do not need to sign in each other's presence. California does not require notarization for validity, though a self-proving affidavit is strongly recommended. California recognizes holographic wills but only if the material provisions are entirely in the the will-maker's handwriting. A will typed on a computer with handwritten additions to the form blanks does not qualify as a valid California holographic will.
Texas requires two witnesses who are at least 14 years old and who sign in the the will-maker's presence. Texas does not require the witnesses to sign in each other's presence. Notarization is not required for validity but is used for the self-proving affidavit. Texas recognizes holographic wills if entirely in the the will-maker's handwriting.
Florida requires two witnesses who sign in the presence of the will-maker and in the presence of each other. Florida is one of the states where all three parties must be present simultaneously. Florida does not recognize holographic wills. Florida also has a specific requirement that the will-maker sign at the end of the will; a signature anywhere else on the document does not satisfy the requirement.
New York requires two witnesses who sign within 30 days of the the will-maker's signature. New York does not require the witnesses to sign in each other's presence. New York does not recognize holographic wills except for members of the armed forces in active military service. New York is one of the more technical states for will execution, and errors in New York wills are a recurring source of litigation.
Illinois requires two witnesses who sign in the presence of the will-maker. Illinois does not recognize holographic wills. Illinois requires the will-maker to declare to the witnesses that the document is their will before the witnesses sign, which is called "publication" of the will. Failing to make this declaration can invalidate an otherwise properly executed Illinois will.
Common execution mistakes that invalidate wills
The most frequent execution errors are straightforward but consequential. Using a beneficiary as a witness is the most common. It seems natural to ask a trusted family member to witness a signature, but if that family member is named in the will, they may lose their bequest or, in some states, invalidate the document entirely.
Witnesses not being present simultaneously is another common problem in states that require all parties to sign in each other's presence, particularly Florida. A will where they signed in the living room while one witness was in the kitchen may not satisfy Florida's simultaneous presence requirement.
Signing in the wrong place matters in states like Florida where the the will-maker's signature must appear at the end of the document. Initialing at the bottom of each page and signing on the final page is standard practice, but signing anywhere other than the designated signature line on the final page can create validity questions.
Alteration after execution is another source of problems. Any change to a will after it has been signed and witnessed, including crossing out a name or writing in a correction, is not effective unless it is executed with the same formality as the original will. Handwritten changes to a typed will are generally ignored in probate and can raise questions about the the will-maker's intentions for the unchanged portions. If a will needs to be changed, the proper approach is to execute a codicil (a formal amendment) or to create an entirely new will.
Using a guided platform to get execution right
The most reliable way to avoid execution errors is to use a platform that generates state-specific documents and provides clear, step-by-step execution instructions. Quicken WillMaker & Trust by Nolo generates a will with the correct language for your state, explains exactly who must sign, in what order, and under what circumstances, and includes the self-proving affidavit with notarization instructions. The state-specific execution guidance alone is worth the cost for anyone uncertain about their state's requirements.
A real-world example
Susan creates a will leaving her estate to her two adult children and names her daughter as executor. She asks her daughter and her son-in-law to witness the document, thinking family members are the natural choice. Her daughter is named in the will as a beneficiary. In her state, an interested witness forfeits their bequest. When Susan dies, her daughter inherits nothing under the will because she was a witness. The son-in-law's witness signature is valid because he is not named in the will, but the second witness is now her daughter, whose signature is disqualified. With only one valid witness, the will fails entirely. Susan's estate passes by intestacy. Her daughter inherits under the intestacy statute, but the distribution is not what Susan wanted, and the process takes significantly longer than probate under a valid will would have.
Frequently Asked Questions
Can a spouse witness the other spouse's will?
In most states, a spouse can witness a will as long as they are not a named beneficiary. Whether a spouse is an interested witness depends on whether they are named in the document, not simply on the marital relationship. However, naming a spouse as a witness when they are also a beneficiary creates exactly the interested-witness problem. The simplest rule is to use witnesses who have no financial stake in the estate at all: neighbors, colleagues, or friends not named in the document.
What happens if only one witness signs instead of two?
A will signed by only one witness when two are required is not validly executed and is treated as if the will-maker died without a will. The estate passes by intestacy under state law. There is no partial validity: a will either meets the execution requirements or it does not. This is why using a guided platform or attorney matters for execution, not just drafting. The document language can be perfect while the execution fails on a procedural point.
Does a will need to be filed or registered anywhere to be valid?
No. A will does not need to be filed with any court or government agency to be legally valid. It is a private document that the will-maker keeps and that the executor presents to the probate court after the the will-maker's death. Some states allow wills to be deposited with the probate court for safekeeping during the the will-maker's lifetime, which can be useful if there is a concern about the document being lost or destroyed. A few states also maintain voluntary will registries. Neither filing nor registration is required for validity.
Can witnesses sign the will on a different day than the will-maker?
It depends on the state. Most states require the witnesses to sign within a specific period of the the will-maker's signature and require the witnesses to have been present when they signed. A few states allow witnesses to sign after the will-maker as long as they acknowledge having witnessed the the will-maker's signature and the execution is treated as a continuous transaction. New York gives witnesses 30 days after the the will-maker's signature to add their own. In states with strict simultaneous presence requirements, like Florida, the witnesses must sign in the same session as the will-maker. Using a guided platform that provides state-specific execution instructions eliminates uncertainty about timing requirements.
Is a will signed in another country valid in the United States?
Generally yes, if it was validly executed under the laws of the country where it was made. Most U.S. states have adopted provisions recognizing wills executed abroad that meet the requirements of the place of execution or that meet U.S. requirements. Practically, a foreign will presented to a U.S. probate court may require translation, authentication of the foreign execution requirements, and potentially additional proceedings to establish its validity. For U.S. citizens with significant U.S. assets who spend time abroad, creating a U.S. will in addition to any foreign will is the cleaner approach for U.S. estate administration.