Self-Proving Affidavit Massachusetts — What It Is and Why Your Will Needs One

Your Massachusetts will is legally valid without a notary. Two witnesses and a signature are enough under M.G.L. c. 190B, § 2-502. But "legally valid" and "easy to probate" are two different things — and the difference between them is a self-proving affidavit.

Without this single additional step, your executor may spend months and thousands of dollars tracking down witnesses to prove your will was properly executed.

What a Self-Proving Affidavit Does

A self-proving affidavit is a sworn statement attached to your will, signed by you and both witnesses before a notary public. It confirms three things:

1. You are the testator and you signed the will voluntarily.
2. You were at least 18 years old and of sound mind at the time of signing.
3. Both witnesses observed your signature or your acknowledgment of it.

Under M.G.L. c. 190B, § 3-406, a will accompanied by a self-proving affidavit creates a legal presumption that all execution requirements were met. The probate court accepts the will without requiring witness testimony or depositions.

What Happens Without One

If your will lacks a self-proving affidavit, your executor may need to prove to the court that the will was properly executed. That may mean locating original witnesses and obtaining testimony or signed depositions.

Ten or twenty years can pass between when you sign your will and when your executor needs those witnesses. In that time, witnesses move, change names, develop memory issues, or die. If neither witness can be found, the court requires additional evidence — sworn statements from people who can identify your signature, for example — and may require formal probate proceedings.

Informal probate does not require a self-proving affidavit, but without one the court may require witness testimony or depositions. Formal probate may be required for a lost or altered will, ambiguity, unrepresented minor or incapacitated heirs, or a dispute; its filing fee is $405 versus $390 for informal probate.

How to Execute the Affidavit

The self-proving affidavit may be signed at the same time as the will or later. A single signing ceremony is a practical way to complete both:

1. You sign the will, or direct another person to sign in your conscious presence, with both witnesses observing the signing or acknowledgment.
2. Both witnesses sign the will.
3. All three of you — testator and both witnesses — sign the self-proving affidavit before a notary public.
4. The notary notarizes the affidavit (not the will itself).

The critical distinction: you are not notarizing the will. Massachusetts wills do not require notarization. The notary's seal goes on the affidavit, which is a separate document attached to the will. Confusing the two is one of the most common errors people make when preparing their estate documents.

Common Mistakes

Completing the affidavit later. Massachusetts allows an attested will to be made self-proving after execution. If you do it later, the testator and witnesses must make the required acknowledgments and affidavits before an officer authorized to administer oaths.

Combining witness and notarial roles. Use a separate notary where possible to keep the witness and notarial roles clear.

Attaching a generic affidavit form. The affidavit must conform to the requirements of M.G.L. c. 190B, § 2-504. A generic notary acknowledgment or a form designed for another state will not satisfy the Massachusetts statute.

Where to Find a Notary

Massachusetts notary services are widely available:

• Banks and credit unions — most branches offer free notary services to account holders
• UPS Store and FedEx Office — typically charge $5 to $15 per notarized document
• Mobile notaries — will come to your home, useful for elderly or homebound testators
• Law offices — most attorneys have notaries on staff

The notarization itself costs nothing under Massachusetts law; notaries may charge a small service fee.

The Two-Minute Investment That Saves Months

Adding a self-proving affidavit to your will takes roughly two minutes during your signing ceremony. It costs nothing if your bank notarizes for free, or at most $15 at a shipping store.

The alternative — your executor spending weeks or months trying to locate witnesses from years or decades ago — is one of the most preventable delays in Massachusetts probate.

The Massachusetts Estate Planning Kit includes the complete self-proving affidavit formatted to M.G.L. c. 190B, § 2-504 requirements, along with a signing-day checklist that ensures every step is completed in the correct order.

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