What Makes a Will Valid in Pennsylvania?

By Wendy Witt, Pittsburgh Probate Attorney | The Pittsburgh Probate Law Firm

A will is one of the most important legal documents a person can create. It is the clearest expression of what someone wanted to happen to their assets, their property, and the people they loved after they were gone. But a will that does not meet Pennsylvania's legal requirements is not just imperfect — it may be entirely invalid. An invalid will is treated by Pennsylvania law as though it never existed at all, meaning the estate passes under Pennsylvania's intestacy laws rather than according to the deceased's wishes.

Understanding what makes a will valid in Pennsylvania matters whether you are planning your own estate or whether you are an executor or family member trying to understand whether a loved one's will can be admitted to probate. This post explains Pennsylvania's requirements clearly and honestly.

The Basic Requirements for a Valid Will in Pennsylvania

Pennsylvania's requirements for a valid will are established in the Pennsylvania Probate, Estates, and Fiduciaries Code. They are not complicated in principle, but they matter enormously in practice.

The Person Making the Will Must Be at Least 18 Years Old

Pennsylvania requires that the person making a will — called the testator — be at least 18 years of age when the will is signed. There is a narrow exception for married individuals under 18, but for most people, the rule is straightforward. A will signed before the testator's 18th birthday is not valid in Pennsylvania.

The Testator Must Be of Sound Mind

This requirement is often called testamentary capacity. To make a valid will in Pennsylvania, the testator must understand what they are doing when they sign it. Specifically, they must understand the nature and extent of their property, know who their natural heirs are, understand what a will is and what signing one means, and understand how these elements relate to one another to form a plan for distributing their estate.

Testamentary capacity is evaluated at the moment the will is signed — not before and not after. A person can have periods of confusion or cognitive decline and still have valid testamentary capacity during a lucid moment when they sign their will. Conversely, a person who appears generally healthy may lack testamentary capacity at the specific moment of signing if they do not meet the legal standard.

It is worth noting that the bar for testamentary capacity in Pennsylvania is intentionally not very high. The law strongly favors allowing people to direct what happens to their own property, and courts are generally reluctant to invalidate a will on capacity grounds without clear and convincing evidence that the testator did not understand what they were doing when they signed it.

The Will Must Be in Writing

Pennsylvania requires that a will be in writing. An oral will — sometimes called a nuncupative will — is generally not valid in Pennsylvania for the disposition of real estate or significant personal property. The writing requirement exists to create a clear, permanent record of the testator's wishes that can be reviewed, interpreted, and enforced after their death.

The writing can be handwritten or typed. It can be a formal legal document prepared by an attorney or a handwritten document prepared by the testator themselves. What matters is that it exists in written form.

The Will Must Be Signed by the Testator

The testator must sign the will. In Pennsylvania, the signature may be the testator's full legal name, initials, a mark, or any other signature the testator intends. What matters is the intent — that the testator is signing the document as their will.

Pennsylvania also allows someone else to sign the will on the testator's behalf, at the testator's direction and in the testator's presence, if the testator is physically unable to sign. This accommodation recognizes that physical disability should not prevent someone from making a valid will.

The Will Must Be Witnessed by Two People

Pennsylvania requires that the testator's signature be witnessed by two competent witnesses who are present at the time of signing. The witnesses must observe the testator sign the will — or must be told by the testator that the signature on the document is theirs — and must then sign the will themselves.

The witnesses do not need to read the will or know its contents. They are simply attesting that they witnessed the testator sign the document and that the testator appeared to be of sound mind and acting voluntarily.

Pennsylvania does not prohibit beneficiaries from serving as witnesses, but having a beneficiary witness a will can create legal complications and is generally not advisable. If a witness is also a beneficiary, their inheritance under the will may be affected or subject to challenge. The safest practice is to use witnesses who have no financial interest in the estate.

Does a Will Need to Be Notarized in Pennsylvania?

No. Pennsylvania does not require a will to be notarized in order to be valid. However, Pennsylvania recognizes a self-proving will — a will that includes a notarized affidavit signed by the testator and witnesses at the time of execution. A self-proving will streamlines the probate process because the witnesses do not need to be located and questioned after the testator's death to confirm the will's validity. The notarized affidavit serves as their attestation.

While notarization is not required, it is strongly recommended. It is a simple additional step when the will is signed that can save significant time and reduce complications during probate.

What About Handwritten Wills?

Pennsylvania recognizes handwritten wills, sometimes called holographic wills, under certain circumstances. A holographic will is one written entirely in the testator's own handwriting. Pennsylvania does not have a separate statutory framework for holographic wills, as some other states do — instead, a handwritten will is evaluated under the same requirements as any other will.

This means a handwritten will in Pennsylvania still needs to be signed by the testator and witnessed by two people to be valid. Unlike some other states, Pennsylvania does not make an exception to the witness requirement for handwritten wills. A handwritten will with no witnesses is not valid in Pennsylvania.

What Makes a Will Invalid in Pennsylvania?

Understanding what can invalidate a will is just as important as understanding what makes one valid. Here are the most common grounds on which a Pennsylvania will can be challenged or found invalid.

Lack of Testamentary Capacity

If the testator lacked the mental capacity required by Pennsylvania law at the time they signed the will, the will can be challenged on that basis. Evidence of dementia, cognitive impairment, or a mental condition that prevented the testator from understanding what they were doing can support a capacity challenge. However, as noted above, the bar is not low — proving lack of testamentary capacity requires clear and convincing evidence.

Undue Influence

A will can be invalidated if it was the product of undue influence — meaning someone exerted so much pressure on the testator that the resulting will reflects that person's wishes rather than the testator's own. Undue influence typically involves a combination of the testator's vulnerability, the influencer's opportunity to exert pressure, and a will that benefits the influencer in a way that seems inconsistent with the testator's prior expressed wishes or natural family relationships.

Undue influence is one of the most commonly alleged grounds for contesting a will, particularly in situations where a caregiver, a new romantic partner, or one family member had significant access to an elderly or ill testator in their final years.

Fraud or Forgery

A will that was procured through fraud — for example, by deceiving the testator about what they were signing — or that was forged entirely is invalid. Fraud and forgery are serious allegations that require strong evidence, but they do arise in contested estate situations.

Improper Execution

A will that was not signed by the testator, not witnessed by two people, or not otherwise executed in accordance with Pennsylvania's requirements may be found invalid on technical grounds. This is one of the strongest arguments for having a will prepared and executed with the assistance of an experienced estate planning attorney — the proper execution of a will is not complicated, but it must be done correctly.

Revocation

A previously valid will can be revoked by the testator during their lifetime. Pennsylvania recognizes several methods of revocation — executing a new will that expressly revokes prior wills, physically destroying the original will with the intent to revoke it, or making written amendments to the will called codicils. A will that has been validly revoked cannot be admitted to probate.

What Happens If a Will Is Found Invalid?

If a will is found to be invalid — either because it was successfully contested or because it does not meet Pennsylvania's formal requirements — the estate is treated as though no will existed. It passes according to Pennsylvania's intestacy laws, which distribute assets based on family relationships rather than the deceased's expressed wishes.

This outcome can be deeply frustrating for families, particularly when everyone involved knows what the deceased wanted but cannot enforce those wishes because the document expressing them does not hold up legally. It is one of the most compelling reasons to ensure that any will is properly drafted and executed from the very beginning.

The Importance of Working With a Probate Attorney

If you are serving as executor and have questions about whether a loved one's will is valid, or if you are a beneficiary who believes a will may be subject to challenge, working with an experienced probate attorney is essential. Validity questions are among the most legally complex issues in estate administration, and the consequences of getting them wrong — in either direction — can be significant.

At The Pittsburgh Probate Law Firm, we guide families of Pennsylvania residents through every aspect of the probate process, including navigating questions about will validity, contested estates, and the legal requirements for admitting a will to probate. We serve families regardless of where the death occurred, and we bring 26 years of probate experience to every situation we handle.

Your first step is a free consultation with no pressure and no obligation. Call us at 412-214-2904 or book online at pittsburghprobatelawfirm.com. Whenever you are ready, we are here.

Wendy Witt is a Pittsburgh probate attorney at The Pittsburgh Probate Law Firm, serving families of Pennsylvania residents regardless of where the death occurred. This post is for general informational purposes and does not constitute legal advice. Every estate is different — please consult an attorney about your specific situation.