Will Execution Requirements in Montana

At a glance

Requirements one by one

Governing law

Montana's will-execution rules are in the Montana Uniform Probate Code, Title 72, Chapter 2, Part 5. The core statute is § 72-2-522 (writing, signature, two witnesses); § 72-2-521 says who may make a will; § 72-2-523 ("writings intended as wills") is the harmless-error provision; § 72-2-524 provides the self-proving affidavit; and § 72-2-525 covers who may witness and the interested-witness rule. Montana adopted the modern Uniform Probate Code, which gives it several features together: holographic wills, a relaxed "reasonable time" witnessing rule, the modern no-effect interested-witness rule, and a harmless-error escape hatch. Montana has not, however, adopted electronic wills.

Minimum age & capacity

"An individual 18 or more years of age who is of sound mind may make a will" (§ 72-2-521). You must be at least 18 — there is no emancipated-minor exception — and of sound mind. The statute does not define "sound mind"; Montana courts apply the familiar test: you must understand that you are making a will, know the people who would normally receive your property (the natural objects of your bounty), and know the general nature and extent of what you own. Capacity is judged at the moment of signing.

Writing & signature

A Montana will must be in writing and "signed by the testator or in the testator's name by some other individual in the testator's conscious presence and by the testator's direction" (§ 72-2-522(1)(b)). If you cannot sign yourself, someone may sign for you — but only in your conscious presence, meaning you are aware it is happening, and at your direction. There is no rule that the signature appear at the end of the document.

Witnesses required

A Montana will needs at least two witnesses, and Montana uses the modern Uniform Probate Code timing rule: each witness must sign "within a reasonable time after" witnessing either the signing of the will or the testator's acknowledgment of the signature or of the will (§ 72-2-522(1)(c)). Two things follow. First, the witnesses do not have to be present at the same time — Montana does not use the stricter "present at the same time" rule some states impose. Second, a witness can sign a little later, so long as it is within a reasonable time after witnessing. A witness need only be "generally competent" (§ 72-2-525(1)).

On interested witnesses, Montana uses the modern no-effect rule: "The signing of a will by an interested witness does not invalidate the will or any provision of it" (§ 72-2-525(2)). A beneficiary who also serves as a witness keeps the gift, and the will stands. Using disinterested witnesses is still good practice because it removes an argument for undue influence, but it is not required for validity.

Notarization & self-proving

A Montana will does not have to be notarized to be valid — a notary is not one of the two required witnesses. What a notary supports is the self-proving affidavit under § 72-2-524, which the testator and witnesses may sign with the will or later before an officer authorized to administer oaths. A self-proved will can be admitted to probate without bringing the witnesses back to testify. Montana adds a backstop: a signature on the self-proving affidavit "is considered a signature affixed to the will if necessary to prove the will's due execution" (§ 72-2-524(3)), so an affidavit signature can shore up a will whose signing is questioned.

Handwritten (holographic) wills

Montana recognizes holographic wills. Under § 72-2-522(2), a will is valid "whether or not witnessed, if the signature and material portions of the document are in the testator's handwriting." Only the signature and the material (dispositive) provisions must be in your own hand; preprinted or typed portions are allowed, and § 72-2-522(3) lets a court use extrinsic evidence — including the non-handwritten parts — to establish that you intended the document as your will. There is no date requirement, though dating a handwritten will is still sensible.

Electronic & remote wills

Montana does not permit electronic wills. It has not enacted the Uniform Electronic Wills Act or any electronic-wills statute, so § 72-2-522's requirement of a physically signed writing witnessed by two people still controls. Even Montana's harmless-error rule reaches only "a document or writing" (§ 72-2-523), so a will that exists only as a computer file "signed" by typing a name, or that was witnessed only over video, is not a valid Montana will. A fully handwritten document may still qualify as a holographic will, and the harmless-error rule can sometimes rescue a defective written document.

Harmless-error / curative doctrine

Montana has a harmless-error rule, one of the reasons its law is comparatively forgiving. Under § 72-2-523 ("writings intended as wills"), a document not executed in compliance with § 72-2-522 is nonetheless "treated as if it had been executed in compliance" if the proponent establishes "by clear and convincing evidence" that the decedent intended it as their will (or as a revocation, alteration, or revival of a will). That can save a will that missed a formality — for example, one signed by only one witness. But there are real limits: the clear-and-convincing standard is demanding, and the rule reaches only "a document or writing," so a purely spoken or video-recorded statement, with nothing in writing, cannot be probated this way. Meeting the ordinary formalities is far safer.

What trips people up

Harmless error needs a written document, not a recording. Section 72-2-523 can rescue a defective will, but only "a document or writing" — a video or voice recording of you describing your wishes, with nothing written and signed, does not qualify, no matter how clear it is. If you want your wishes to control, put them in a signed writing.

Notarizing a will is not the same as witnessing it. Taking a typed will to a notary does not satisfy § 72-2-522, which requires two witnesses. Notarization matters only for the self-proving affidavit under § 72-2-524 (which, in Montana, can also back up the will's signature if execution is questioned).

"Reasonable time" is a safety net, not a plan. Montana lets a witness sign within a reasonable time after watching you sign or hearing your acknowledgment (§ 72-2-522(1)(c)), but the cleanest practice is still to have both witnesses watch you sign and sign right then. Stretching the timing invites a fight over what was "reasonable."

A handwritten will still needs the key terms in your hand. A holographic will requires the signature and the material provisions to be handwritten (§ 72-2-522(2)). A typed will you merely sign is not a holographic will — it has to meet the ordinary two-witness rules instead.

Common questions

Does my Montana will have to be notarized? No. Montana requires two witnesses, not a notary (§ 72-2-522). Notarization only supports the optional self-proving affidavit under § 72-2-524, which makes probate easier but is not required for validity.

Can I handwrite my own will without witnesses? Yes. Montana recognizes holographic wills: if your signature and the material provisions are in your own handwriting, the will is valid with no witnesses (§ 72-2-522(2)). There is no date requirement, but keep the gifts clear.

Can a video of me stating my wishes serve as my will? No. A Montana will must be a written, signed document, and even the harmless-error rule (§ 72-2-523) applies only to "a document or writing" — not a video or audio recording. Put your wishes in a signed writing with two witnesses.

What happens if only one person witnessed my will? Ordinarily that fails the two-witness rule, but Montana's harmless-error statute (§ 72-2-523) can still save it if there is clear and convincing evidence you intended the document as your will. That is an uphill, costly fight — use two witnesses.

Statutes and sources

• Mont. Code Ann. § 72-2-521 — who may make a will: an individual 18 or older of sound mind. https://mca.legmt.gov/bills/mca/title_0720/chapter_0020/part_0050/section_0210/0720-0020-0050-0210.html (accessed 2026-07-11)
• Mont. Code Ann. § 72-2-522 — execution: writing, signature (or a proxy in the testator's conscious presence), two witnesses signing within a reasonable time; holographic wills; intent by extrinsic evidence. https://mca.legmt.gov/bills/mca/title_0720/chapter_0020/part_0050/section_0220/0720-0020-0050-0220.html (accessed 2026-07-11)
• Mont. Code Ann. § 72-2-523 — harmless error ("writings intended as wills"): a noncompliant document or writing is treated as a valid will on clear and convincing evidence of the decedent's intent. https://mca.legmt.gov/bills/mca/title_0720/chapter_0020/part_0050/section_0230/0720-0020-0050-0230.html (accessed 2026-07-11)
• Mont. Code Ann. § 72-2-524 — self-proving affidavit; a signature on the affidavit counts as a signature on the will if needed to prove due execution. https://mca.legmt.gov/bills/mca/title_0720/chapter_0020/part_0050/section_0240/0720-0020-0050-0240.html (accessed 2026-07-11)
• Mont. Code Ann. § 72-2-525 — who may witness (generally competent); an interested witness does not invalidate the will or lose the gift. (Fetched from the on-domain legacy path because the current per-section page returned only the History line — see verified_via.) https://mca.legmt.gov/bills/2007/mca/72/2/72-2-525.htm (accessed 2026-07-11)