Self Proving Affidavit Montana: What It Is and Why Your Will Needs One

A self-proving affidavit is a notarized statement attached to your will that eliminates one of probate's most frustrating bottlenecks: finding and producing your witnesses after you die.

Without a self-proving affidavit, Montana probate courts must verify your will's validity by locating the original witnesses and having them testify — either in person or through a sworn statement — that they actually watched you sign the will and that you appeared competent. If those witnesses have moved out of state, become incapacitated, or died, the court may require handwriting analysis or additional evidence before admitting your will.

With a self-proving affidavit, the court accepts the will based on the notarized statement alone. Informal probate can proceed immediately without witness testimony.

How It Works Under MCA 72-2-524

Montana's self-proving affidavit statute is straightforward. The affidavit can be executed either:

• At the same time you sign your will (the most common approach), or
• At any point after your will is signed, as long as the testator and the original witnesses are available to sign

The affidavit is a separate document (or attached page) that includes sworn statements from both the testator and the two witnesses, all signed before a notary public. The statutory language under MCA 72-2-524 follows a specific format that the notary verifies:

The testator swears that they signed the will voluntarily, that they were 18 or older, of sound mind, and under no constraint or undue influence. Each witness swears that they observed the testator sign (or acknowledge their signature), that the testator appeared to be of sound mind, and that they signed as witnesses voluntarily.

The Practical Difference It Makes

Consider two scenarios for a Montana family after a death:

Without a self-proving affidavit: The personal representative files the will with the Clerk of the District Court and pays the $100 filing fee. The court requires testimony from the two witnesses. One witness moved to Oregon five years ago. The other changed their phone number. The representative must hire a process server or attorney to track them down, secure sworn statements, and submit them to the court. This can add weeks or months to the probate timeline, plus hundreds in search and legal costs.

With a self-proving affidavit: The personal representative files the will, the court reviews the notarized affidavit, and informal probate proceeds. The entire witness verification step is eliminated.

How to Execute the Affidavit

The process requires coordination between three parties at one meeting:

1. Schedule a notary appointment. You need the testator, both witnesses, and a notary public all present at the same time.

2. Sign the will first. The testator signs the will in the presence of both witnesses. The witnesses sign immediately after.

3. Execute the affidavit. Without leaving the signing session, the testator and both witnesses each sign the self-proving affidavit before the notary, who administers the oath and applies their seal.

The entire process takes 15-20 minutes. Many Montana banks, UPS stores, and law offices offer notary services for $5-$10 per signature.

Common Mistakes That Invalidate the Affidavit

Using the wrong statutory language. The affidavit must substantially conform to the language in MCA 72-2-524. Generic notary acknowledgments or out-of-state forms may not satisfy Montana requirements. Use the Montana-specific statutory form.

Signing the affidavit but not the will. The affidavit proves the will's execution — it doesn't replace it. Both documents must be properly signed. Occasionally people get confused and sign only the affidavit, leaving the will itself unsigned.

Using witnesses who are also beneficiaries. While Montana law doesn't technically invalidate a will witnessed by a beneficiary, it creates grounds for a challenge. The self-proving affidavit's streamlined process only works smoothly when the witnesses are disinterested parties.

Separating the affidavit from the will. The affidavit should be physically attached to or filed with the will. If stored separately, there's a risk it gets lost or separated, defeating its purpose. Staple it to the will and store them together.

Can You Add One to an Existing Will?

Yes. If you already have a valid Montana will but never executed a self-proving affidavit, you can add one at any time. You'll need to gather the original two witnesses and a notary for a brief signing session. The testator and witnesses sign the affidavit confirming the original will execution, and the notary certifies it.

This is one of the highest-value, lowest-cost improvements you can make to an existing estate plan. If your will is more than a few years old and lacks a self-proving affidavit, scheduling a 20-minute notary appointment could save your family significant time and expense.

The Montana Basic Estate Planning Kit includes the self-proving affidavit template formatted to Montana's statutory requirements, along with step-by-step instructions for the signing session and a checklist of what to bring to the notary.

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