Will requirements in Missouri
Missouri caps a witness-beneficiary at their intestate share unless two disinterested witnesses signed, allows emancipated minors to make a will, and does not recognize handwritten wills.
Missouri applies a purge with a saving clause. A witness who inherits forfeits whatever exceeds the share they would have taken had you died without a will, unless two disinterested witnesses also signed.
Missouri also allows an emancipated minor to make a will, an exception a number of states share but which is easy to miss. What Missouri does not allow is a handwritten will — a handwritten, unwitnessed document has no effect here.
Who can make a will in Missouri
At a glance
18 or older, or an emancipated minor, and of sound mind
Missouri requires you to be at least 18, or an emancipated minor, and of sound mind. The emancipation exception lets someone under 18 who has been legally emancipated make a valid will.
Capacity is judged at the moment of signing and asks whether you understood the nature of the act, roughly what you owned, and who would ordinarily expect to inherit from you.
Witness requirements
How many witnesses
Two witnesses, who must sign in your presence
Mo. Rev. Stat. §§ 474.320, 474.330(2)
Purging statute with an intestate-share saving clause
A witness who inherits forfeits the amount exceeding their intestate share, unless two disinterested witnesses also signed
Two witnesses must sign in your presence. The execution formalities themselves are conventional.
The interested-witness rule cuts back rather than voids. A witness-beneficiary forfeits only the amount exceeding what they would have taken in intestacy, and the forfeiture does not apply at all if two disinterested witnesses also signed. An heir keeps their intestate portion; someone who is not an heir keeps nothing, because their intestate share is zero. Using two disinterested witnesses removes the question entirely.
Whatever Missouri allows, the safe practice is the same everywhere: use two disinterested witnesses who inherit nothing under the will.
Notarization and self-proving affidavits
At a glance
Notarization is not required for validity; a self-proving affidavit is available
A Missouri will is valid without a notary. Notarization produces the self-proving affidavit — a sworn statement signed by you and both witnesses and attached to the will, letting it be admitted to probate without your witnesses being located and asked to testify.
Because Missouri's forfeiture only bites when two disinterested witnesses did not sign, the moment of taking the affidavit is a good opportunity to confirm that neither of your witnesses inherits under the will.
Handwritten (holographic) wills
At a glance
Not recognized
Missouri does not recognise holographic wills. A handwritten, unwitnessed document has no effect as a will here regardless of how clearly it sets out your wishes.
Missouri requires a written will that you sign with two witnesses signing in your presence. The informal handwritten note many people imagine as a backup does nothing in Missouri.
Small estate procedure
At a glance(unsettled)
Missouri offers a small-estate affidavit for estates below a statutory threshold
Confirm this with the probate division of the circuit court in the county where the estate would be administered.
Missouri allows property to be collected by affidavit where the estate falls below a statutory limit, avoiding full administration.
Confirm the current figure with the probate division of the circuit court in the relevant county rather than relying on an aggregated number found online. Thresholds are adjusted over time, and the court will apply the one in force.
Community property or common law
At a glance
Common law (separate property) state
Missouri is a common law property state. Ownership follows title rather than being automatically shared between spouses because property was acquired during the marriage.
A surviving spouse has an elective share, so a spouse generally cannot be disinherited by will alone. Missouri also provides statutory allowances for a surviving spouse and minor children that take priority over what the will directs.
Advance directives and powers of attorney
At a glance
Statutory health-care directive and durable power of attorney for health care
Missouri provides a health-care directive for recording treatment preferences and a durable power of attorney for health care naming someone to make medical decisions when you cannot. These are often combined into a single document in practice.
A separate durable power of attorney covers financial affairs. These documents operate while you are alive, which is precisely the gap a will never fills.
Frequently asked about Missouri wills
- What happens if a beneficiary witnesses my Missouri will?
- They forfeit the amount exceeding what they would have inherited had you died without a will, unless two disinterested witnesses also signed. For a child who was already an heir, the cap may cost little. For a friend, stepchild or charity, the intestate share is zero, so the gift is effectively lost. Use two disinterested witnesses and the issue never arises.
- Is a handwritten will valid in Missouri?
- No. Missouri does not recognise holographic wills, so a handwritten, unwitnessed document has no effect here regardless of how clear it is. Missouri requires a written will that you sign with two witnesses signing in your presence.
- Can someone under 18 make a will in Missouri?
- Yes, if they have been legally emancipated. Missouri allows a will from anyone 18 or older, or from an emancipated minor, provided they are of sound mind. That exception is easy to miss when reading general guidance written for other states.
- Do I need a notary for a Missouri will?
- Not for validity. Your signature and two witnesses signing in your presence are what make the will valid. A notary is used for the self-proving affidavit, which is optional but worth doing — it lets the will be admitted to probate without your witnesses having to be found and asked to testify years later.
This is not legal advice
This page is general information about Missouri law, not legal advice, and reading it does not create an attorney-client relationship. Statutes change, courts interpret them differently, and the right answer depends on facts this page cannot know. Legacy Suite is not a law firm — before you sign or rely on anything, consult an attorney licensed in Missouri.
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