Self-Proving Affidavit for Wills Requirements in Montana

At a glance

Requirements one by one

Availability and governing law

Montana places both self-proof routes in MCA § 72-2-524. Subsection (1) combines execution, witness attestation, and self-proof in one ceremony. Subsection (2) lets an already attested will be made self-proved later. Section 72-3-321 governs the affidavit's effect when proper execution is contested.

Who signs or swears

The testator and both witnesses participate in both forms. In the simultaneous form, the testator signs, is sworn, and declares willing execution or willing direction of another signer. Each witness signs, is sworn, and makes the listed execution statements. The officer then certifies the testator's subscription, oath, and acknowledgment and the witnesses' subscriptions and oaths.

The later form repeats the same three affiant signature lines. It does not let a personal representative or another person substitute for the testator or either witness.

When it may be made

Subsection (2) says an attested will may be made self-proved “at any time after its execution.” No numerical deadline appears. The signer set supplies the practical limit: the later form still requires the testator and both witnesses to make the statements before the officer.

Officer, oath, and seal

The officer must be authorized to administer oaths under the law of the state where the execution or later acknowledgment occurs. The officer's signed certificate and official capacity are required, and Montana is explicit about the seal: both routes require the certificate “under official seal,” and each printed form includes a “(SEAL)” line.

Required recitals and form

Both forms need only be followed “substantially.” The testator recites willing and free execution or directed signing, age eighteen or older, sound mind, and freedom from constraint or undue influence. The witnesses swear that the testator signed willingly and that each witness signed “in the presence and hearing of the testator.”

The form does not add mutual witness presence, signing at the testator's request, or a minimum witness age. Those concepts should not be presented as statutory self-proof recitals.

Attachment to the will

For later self-proof, the officer's certificate must be “attached or annexed to the will.” Section 72-3-321 uses the same attachment language when identifying what the proponent files to obtain witness-free execution proof.

Section 72-2-524(3) adds a signature-spillover rule. A signature on an attached self-proving affidavit counts as a signature on the will when that is necessary to prove due execution. It does not erase the other execution requirements.

Electronic, remote, and out-of-state rules

Section 72-2-524 does not create a separate electronic-will or remote-affidavit procedure. It does allow the officer to act under the law of the state where the execution or later acknowledgment occurs, so the ceremony need not take place in Montana if the officer has authority there.

The section does not separately say that an affidavit made under another state's self-proof statute automatically receives Montana self-proved status. That question is distinct from whether the will was validly executed.

Probate effect and exceptions

Section 72-3-321(1) applies in a contested case where proper execution is at issue. Upon filing the self-proved will and the attached or annexed acknowledgment and affidavits, the will satisfies execution without testimony from any attesting witness.

The stated exception is evidence of fraud or forgery affecting the acknowledgment or affidavit. The shortcut proves execution; the statute does not make the affidavit conclusive on separate issues such as capacity or undue influence.

If there is no affidavit

Section 72-3-321(2) ordinarily requires testimony from at least one attesting witness who is in Montana, competent, and able to testify. Proper execution may also be established by other evidence, including an attesting witness's affidavit. A signed attestation clause creates a rebuttable presumption that its recited events occurred.

That fallback confirms the core distinction: self-proof changes the evidence needed in probate, not the validity requirements for the will itself.

What trips people up

• The official seal is mandatory. Montana requires the officer's certificate under official seal in both forms.
• Later self-proof still needs all three affiants. “At any time” does not create a post-death substitute signer route.
• The affidavit has three signature lines. The testator and both witnesses sign before the officer completes the certificate.
• Fraud or forgery defeats the shortcut. Section 72-3-321 expressly withholds witness-free proof when the acknowledgment or affidavit is affected.

Common questions

Can I add the affidavit after signing the will?

Yes. Section 72-2-524(2) allows later self-proof at any time, but the testator and both witnesses still must participate before an authorized officer.

Can an affidavit signature repair a missing will signature?

Potentially. Section 72-2-524(3) treats a signature on an attached self-proving affidavit as a will signature when necessary to prove due execution. It does not excuse the remaining execution requirements.

Must the ceremony occur in Montana?

No. The officer's authority is measured by the law of the state where execution or the later acknowledgment occurs. The certificate must still meet Montana's substantial form and official-seal requirements for this self-proof route.

Statutes and sources

• Mont. Code Ann. § 72-2-524 — both self-proof routes, substantial forms, official seal, attachment, and affidavit-signature rule. https://mca.legmt.gov/bills/mca/title_0720/chapter_0020/part_0050/section_0240/0720-0020-0050-0240.html (accessed 2026-08-01)
• Mont. Code Ann. § 72-3-321 — contested-case effect, fraud/forgery exception, and alternate proof without self-proof. https://mca.legmt.gov/bills/mca/title_0720/chapter_0030/part_0030/section_0210/0720-0030-0030-0210.html (accessed 2026-08-01)