Why the Requirements Matter More Than You Might Think
Most people assume that if they write down their wishes and sign the paper, they have a valid will. Sometimes that’s true. But the law in Wyoming—like in every state—has specific rules about what makes a will legally enforceable. A document that doesn’t meet those requirements isn’t just imperfect; it may be treated as if it never existed at all.
That means the state decides who gets your assets, not you. Wyoming’s intestacy laws would kick in, distributing your property according to a formula based on family relationships—regardless of what you actually wanted. For parents with young children, blended families, unmarried partners, or anyone with specific wishes about who should receive what, this outcome can be devastating.
The good news is that the basic requirements aren’t complicated. Here’s what Wyoming law requires for a will to be valid.
Requirement #1: The Person Making the Will Must Have Legal Capacity
The first requirement is that the person creating the will (called the testator) must have the legal capacity to do so. In Wyoming, that means two things:
You must be at least 18 years old. Minors generally cannot create a legally valid will in Wyoming, with limited exceptions for those who are married or serving in the military.
You must be of “sound mind” at the time of signing. This is the part people most often misunderstand. Being of sound mind doesn’t mean you have to be in perfect mental health, free of illness, or even free of memory problems. Wyoming courts have consistently held that the standard is relatively modest. To meet it, you need to:
- Understand that you are creating a will
- Know the general nature and extent of your property
- Know who your natural heirs are (spouse, children, close relatives)
- Understand how the document distributes your assets
Someone in the early stages of dementia, for example, may still have the capacity to sign a valid will—particularly if the signing happens on a good day and is properly documented. What matters is your mental state at the specific moment you sign, not your general health over time.
This is also why timing matters. If there is any question about capacity, having an attorney present at the signing—and documenting the circumstances carefully—can make the difference between a will that holds up in court and one that gets challenged.
Requirement #2: The Will Must Be in Writing and Signed by the Testator
Wyoming law requires that a will be in writing. Verbal wills, such as telling someone your wishes out loud, even in front of witnesses, are not legally enforceable in Wyoming. Your intentions need to be documented.
The will must also be signed by you, the testator. If you are physically unable to sign your own name, Wyoming law allows another person to sign on your behalf, but only if you direct them to do so and the signing happens in your presence.
But, Wyoming does recognize holographic wills—wills that are entirely handwritten and signed by the testator, with no witnesses required. Under Wyoming Statute § 2-6-113, a holographic will is valid as long as the material portions are in your own handwriting and it is signed by you.
That said, holographic wills come with real risks. They’re more likely to be challenged, more likely to contain ambiguous or incomplete language, and more likely to leave out important provisions that a properly drafted will would include. Writing your own will by hand might seem simple, but the consequences of getting it wrong fall entirely on the people you leave behind.
Requirement #3: The Will Must Be Properly Witnessed
For a typed or formally prepared will in Wyoming, the signature must be witnessed by at least two people. Those witnesses must:
- Be present when you sign the will (or acknowledge your signature)
- Sign the will themselves in your presence
- Be adults of sound mind
Wyoming law also strongly discourages, and in some cases can penalize, having interested witnesses sign your will. An interested witness is someone who stands to inherit under the will. While a will signed by an interested witness isn’t automatically void in Wyoming, it can create legal complications and open the door to challenges claiming undue influence. The safest approach is to use witnesses who have no stake in your estate whatsoever.
Many will attorneys also recommend having your will notarized with a self-proving affidavit. While notarization is not required for a will to be valid in Wyoming, a self-proved will streamlines the probate process significantly—the witnesses don’t have to be tracked down and questioned after you’re gone.
A Valid Will Is Just the Starting Point
Meeting these three requirements—legal capacity, written and signed, properly witnessed—is what makes a will legally valid. But a valid will isn’t necessarily a good will. A will that was drafted without legal guidance might be valid in form but full of provisions that create confusion, trigger disputes, or fail to accomplish what you actually intended.
An estate planning attorney can make sure your will not only meets Wyoming’s legal requirements but also clearly expresses your wishes, accounts for your specific assets and family situation, and works alongside any other estate planning tools you have in place—such as trusts, beneficiary designations, or powers of attorney.
