Matisoff v. Dobi

New York Court of Appeals struck down a prenup that was properly signed by both parties — solely because it lacked the formal acknowledgment required by New York Domestic Relations Law §236(B)(3).

Why this case matters

Matisoff is why New York attorneys obsess over the acknowledgment block. The case is the perfect example of a prenup where the substance was fine and the form killed it. For anyone signing a New York prenup, ensuring the acknowledgment is present and correctly worded is the single most important technical detail.

The facts

The parties signed a prenup before their marriage. Both signed; the document's authenticity was never in dispute. But the prenup was not "acknowledged" — meaning it did not include the formal notarial acknowledgment in the form required to record a deed in New York. At divorce, the husband sought to enforce the agreement. The wife challenged it on the narrow ground that it lacked the §236(B)(3) acknowledgment.

The holding

The New York Court of Appeals refused to enforce the prenup. The court held that §236(B)(3)'s acknowledgment requirement is mandatory and non-curable. A prenup without proper acknowledgment is unenforceable regardless of whether the parties intended to be bound, whether their signatures are genuine, or whether the substance of the agreement is fair. The acknowledgment serves the legislative purpose of ensuring the gravity of the transaction is impressed on the parties — and the court would not relax it.

What it means for you

• New York prenups must be acknowledged with the formalities required to record a deed — a notary block with specific certificate language.
• A missing or defective acknowledgment voids the entire agreement, even where everything else is correct.
• This is the single most common technical defect that voids New York prenups.
• Any New York family law attorney drafting a prenup will use the correct acknowledgment form as a matter of course — but DIY templates frequently miss it.
• Curing the defect retroactively is not possible: the acknowledgment must be contemporaneous with signing.

Primary source

The full opinion is available at: https://law.justia.com/cases/new-york/court-of-appeals/1997/90-n-y-2d-127-0.html

New York prenup law in context

New York prenups are governed by N.Y. Dom. Rel. Law §236(B)(3) — official statute text. For the full cost breakdown, attorney rate ranges, and procedural requirements, see the New York prenup cost guide.

To check whether your specific situation has the kind of risks Matisoff v. Dobi identifies, take the 60-second prenup quiz — it applies New York-specific rules to your answers.

A note on legal citation

This page summarizes a published court opinion for educational purposes. We aim for accuracy but recommend reading the primary source linked above for the controlling text. Court opinions can be modified, distinguished, or overruled by later decisions; for current law, consult a family law attorney licensed in New York.