A self-proving affidavit is a sworn, notarized statement signed by the person making a will and the witnesses to it, attached to the will so that a probate court will accept the will as validly executed without having to call those witnesses to testify after death. Nearly every U.S. state recognizes them. The District of Columbia, Maryland, Ohio, and Vermont currently do not.
What It Does at Probate
When a will enters probate, the court’s first job is confirming it is authentic. Without a self-proving affidavit, that means locating the people who witnessed the signing and getting them to confirm, under oath, what happened. Witnesses move. They become ill. They die. Decades can pass between the day a will is signed and the day it is offered for probate.
A self-proving affidavit handles that confirmation in advance. Because the testator and witnesses swore to the proper execution of the will at the time it was signed, the court treats the notarized affidavit as sufficient proof that the testator signed willingly, was mentally competent, and was not being coerced. The will can be admitted without anyone appearing in court or submitting additional sworn statements.
The same contemporaneous record makes the will harder to attack later. A relative alleging forgery, fraud, or undue influence is pushing against a notarized document, signed under oath at the moment of execution, that directly contradicts the claim. Courts give significant weight to that evidence, and challengers carry the burden of overcoming it. The affidavit doesn’t bar a contest, but it raises the bar.
Who Signs and What the Affidavit Must Say
Three people, at minimum, are involved: the testator, at least two witnesses, and a notary public. Each plays a distinct role, and a problem with any one of them can undermine the affidavit.
Witnesses
Witnesses must be adults, and they should be disinterested, meaning they do not stand to inherit anything under the will. This is not just good practice. In most states, a beneficiary who also serves as a witness triggers a purging statute: the will stays valid, but the witness-beneficiary may lose part or all of their inheritance. Some states void only the portion that exceeds what the witness would have received without the will; others are stricter. The clean fix is to pick witnesses who are not named in the will.
Required Content
Most states model their affidavit on the Uniform Probate Code. The testator declares that they signed the will voluntarily, were at least 18 years old, were of sound mind, and were not under undue influence. The witnesses separately swear that they watched the testator sign, or heard the testator acknowledge the signature, and that the testator appeared competent and unconstrained. Everyone signs and dates the document, and the notary certifies it under official seal.
States vary in the specific language they require, and some are strict about it. A generic form pulled from the internet, rather than one that tracks your state’s statutory language, is one of the most common mistakes. An affidavit that does not substantially follow the required format may accomplish nothing.
The Notary
The notary verifies the identity of everyone signing, which in most states means checking a current government-issued photo ID. The notary then administers the oath, watches each person sign, and applies the official seal. The notary is not evaluating the will’s contents or giving legal advice. The job is to confirm that the right people appeared, that they were who they claimed to be, and that they signed voluntarily.
How to Execute One
There are two ways to create a self-proving affidavit, and not every state allows both.
One-Step Execution
The will signing and the affidavit happen as a single event. The testator, the witnesses, and the notary are all present together. The testator signs the will, the witnesses sign the will, and then everyone immediately signs the affidavit while the notary administers the oath and certifies the document. The Uniform Probate Code authorizes this approach, and many states have adopted it. It is the most efficient method because everything is done in one sitting.
Two-Step Execution
The will is signed and witnessed first, and the affidavit is created later. The testator and the original witnesses reconvene before a notary, each acknowledges their earlier signatures on the will, and the notary administers the oath and certifies the affidavit. The Uniform Probate Code allows this as well, noting that a will “may be made self-proved at any time after its execution.” This is the route for anyone who already has a signed will but did not create an affidavit at the time.
Under traditional notarization rules, everyone must be physically present before the notary at the same time. The testator and witnesses cannot sign separately or at different locations. Once completed, the affidavit should be physically attached to the original will and stored with it. A separated affidavit creates confusion in probate court.
Adding One to a Will You Already Have
If you already have a signed and witnessed will but never attached a self-proving affidavit, you can add one without rewriting the will. Gather the same witnesses who signed the original, bring them to a notary, execute the affidavit, and attach it.
The catch is finding those original witnesses, which is the exact problem the affidavit is meant to solve at probate. If one or both are unavailable, most states will not let you substitute new witnesses for the affidavit, because new witnesses did not actually observe the will signing. You then have two practical options. You can execute a new will entirely, with new witnesses and a self-proving affidavit done simultaneously. Or you can add a codicil, which is a formal amendment to the will, and attach a self-proving affidavit to the codicil. A codicil follows the same execution requirements as a will, including the option for a self-proving affidavit.
Remote Online Notarization
As of early 2025, more than 45 states and the District of Columbia have enacted permanent laws authorizing remote online notarization, where the signer and the notary connect by live video rather than meeting in person. Whether your state allows remote notarization for a self-proving affidavit specifically is a separate question. Some states that permit remote notarization for most documents carve out wills and estate-planning documents; others have embraced it fully.
Two things are worth confirming before relying on it: whether your state authorizes remote notarization for will-related documents, and whether the probate court that will eventually receive the will accepts remotely notarized affidavits. The law here is moving quickly, and a document that is technically valid under notarization rules can still draw pushback from a court unfamiliar with the process. When in doubt, an in-person signing is the safer choice.
If the Affidavit Is Defective or Missing
A flawed self-proving affidavit does not invalidate the will. This is one of the most important things to understand about these documents. The affidavit is a proof mechanism, not a validity requirement. If the notary forgot a seal, a witness signed on the wrong line, or the language does not quite match the state’s statutory form, the will itself remains intact. The estate simply has to prove the will the traditional way.
Common defects include using affidavit language from the wrong state, having witnesses sign without a notary present, and failing to have everyone present at the same time. Getting it right the first time is worth the small amount of extra care it takes.
When a will reaches probate without any self-proving affidavit, the executor has to establish validity through other means. The court typically requires at least one of the original witnesses to provide a sworn, notarized statement confirming the will was properly signed, or to testify in person. If both witnesses are available and cooperative, this is manageable, but it adds time and cost. If a witness has died, moved, or lost capacity, the executor must turn to alternative evidence, such as testimony from people familiar with the handwriting involved, or other circumstantial proof that the will is genuine. These methods are slower, more expensive, and less certain. In contested cases, the absence of a self-proving affidavit can be the difference between a routine probate and a drawn-out fight.