Can Prenups Be Verbal Agreements?

A promise made across the dinner table before the wedding may feel binding, but in Washington a prenuptial agreement has to be written and signed to mean anything in court. A verbal understanding, no matter how sincere, is not an enforceable prenup.

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Why a Prenup Has to Be in Writing

The short answer is that a verbal prenup will not be enforced. A prenuptial agreement is a contract that reshapes the property and financial rights two people would otherwise have under Washington law, and courts will not take one party's word for what those terms were. The whole point of a prenup is certainty: both spouses want to know, well in advance, exactly what happens to their property if the marriage ends. A spoken promise offers the opposite of certainty. Memories differ, conversations get remembered differently, and there is no reliable way for a judge years later to reconstruct what two people actually agreed to over coffee before the wedding.

For that reason, an enforceable prenuptial agreement in Washington is a written document, signed by both parties. If it is not written down and signed, there is nothing for a court to enforce. A verbal agreement is, at best, an intention, and intentions do not override the default property rules that the law would otherwise apply.

What the Default Rules Do When There Is No Valid Prenup

Understanding why the writing matters helps to look at what happens without a valid agreement. Washington is a community property state, and it has clear statutory defaults. Property a spouse owned before the marriage, along with anything received during the marriage by gift, bequest, devise, descent, or inheritance, is that spouse's separate property under RCW 26.16.010. Most property acquired during the marriage, by contrast, is community property under RCW 26.16.030, owned by both spouses together.

A prenup is how a couple opts out of or adjusts those defaults. A valid, signed prenup can change what counts as separate versus community, protect a business, or spell out how assets get divided. But if the couple only talked about doing this and never put it in a signed writing, the defaults control. The court applies RCW 26.16.010 and RCW 26.16.030 as if the conversation never happened, because a verbal side agreement cannot displace the statute.

The Fairness Framework Behind an Enforceable Prenup

Even a written, signed prenup is not automatically enforceable in Washington. There is no prenup statute in this state, so the rules come from case law. The controlling decision is In re Marriage of Matson, 107 Wn.2d 479 (1986), where the Washington Supreme Court laid out the test courts still use today.

Matson set up a two part analysis. First, the court asks whether the agreement makes a fair and reasonable provision for the spouse who is not trying to enforce it. If the agreement is fair on its face, that is generally the end of the inquiry. If it is not fair, the court moves to the second part and asks whether the disadvantaged spouse entered into the agreement freely and knowingly. That means asking whether both spouses fully disclosed the amount, character, and value of their property, and whether the agreement was signed with independent advice and full knowledge of the rights being given up.

Look at what that test requires: disclosure of property, a written record of what each party owned, evidence of independent legal advice, and proof that the terms were understood. A verbal agreement produces none of this. There is no signed document to examine for fairness, no attached disclosure of assets, and no record that anyone got independent advice. A court could not apply the Matson test to a conversation even if it wanted to. That is another reason verbal prenups fail: they cannot satisfy, or even be evaluated under, the very framework that governs enforceability.

Common Situations Where This Comes Up

Couples run into this most often when one person assumed a spoken understanding would protect a specific asset. A family business, an inheritance someone expected to receive, a house owned before the marriage, or a promise that "your student loans stay yours" are all classic examples. The spouse who relied on the conversation is often surprised, sometimes years into the marriage, to learn that the default rules apply and the promise carries no legal weight.

The lesson is not that the conversation was pointless. Talking honestly about finances before marriage is healthy and often the first step toward a real agreement. The lesson is that the conversation has to be reduced to a signed writing, with real disclosure and ideally independent counsel for each person, before it protects anyone.

Getting It Right the First Time

If you are engaged in Snohomish County and you and your partner have talked through how you want to handle property, the next step is to put that understanding into a properly drafted, signed prenuptial agreement. Doing it right matters twice over: the document has to exist in writing to be enforceable at all, and it has to be fair, disclosed, and voluntary to survive the Matson test if it is ever challenged. Skipping the paperwork, or drafting it carelessly at the last minute, is how good intentions turn into unenforceable ones.

If you want an agreement that actually holds up rather than a handshake that does not, the Law Office of Chad Foster works with couples throughout Snohomish County to draft prenuptial agreements that meet Washington's requirements. Get in touch to talk through what you have in mind before the wedding gets any closer.

This article is general information, not legal advice. For guidance on your specific circumstances, consult a qualified Washington family law attorney.