What Makes a Prenup Invalid in Oregon?

Key Takeaways

• Oregon follows the Uniform Premarital Agreement Act, codified at ORS 108.700 to 108.740.
• A prenup must be in writing and signed by both parties to be valid.
• A prenup is unenforceable if a spouse did not sign it voluntarily.
• A prenup that was unconscionable when signed, without fair financial disclosure, may be thrown out.
• A prenup cannot reduce a child’s right to support, and spousal support waivers have limits.

A prenuptial agreement only protects you if it holds up when it matters most. At Levine Law Center, your Portland Prenuptial Agreement Lawyers, we help couples draft agreements that will stand up in court and review existing agreements for weaknesses. Knowing what makes a prenup invalid in Oregon is the best way to avoid building one that fails.

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Oregon’s Legal Framework for Prenuptial Agreements

Oregon adopted the Uniform Premarital Agreement Act, found in ORS 108.700 to 108.740. Under ORS 108.705, a premarital agreement must be in writing and signed by both parties, and it becomes effective upon marriage. An oral promise about property, no matter how sincere, is not an enforceable prenup.

Couples new to the topic can start with our overview of prenuptial agreement key facts before looking at enforcement issues.

When a Prenup Is Not Signed Voluntarily

Under ORS 108.725, a premarital agreement is not enforceable if the spouse challenging it proves they did not sign it voluntarily. Courts look at the circumstances surrounding the signing, including pressure, threats, and timing.

A prenup presented days before the wedding, after invitations are out and deposits are paid, invites a voluntariness challenge. Giving both parties time to review the agreement and consult their own attorneys is one of the simplest ways to protect it. When a prenup is challenged during a divorce, an experienced Portland divorce attorney can review how and when it was signed.

Unconscionability and Lack of Financial Disclosure

ORS 108.725 also allows a court to refuse enforcement when the agreement was unconscionable at the time it was signed and the challenging spouse:

• Did Not Receive Disclosure: Was not given fair and reasonable disclosure of the other party’s property and financial obligations.
• Did Not Waive Disclosure: Did not voluntarily and expressly waive, in writing, any right to that disclosure.
• Lacked Knowledge: Did not have, and could not reasonably have had, adequate knowledge of the other party’s finances.

Full financial disclosure is the strongest protection against this challenge. Understanding what a prenup costs in Oregon helps couples see that careful drafting is a small investment compared with a failed agreement.

Terms Oregon Courts Will Not Enforce

Some terms are invalid no matter how carefully the prenup was signed. A premarital agreement cannot adversely affect a child’s right to support. Spousal support provisions also have limits: if eliminating or reducing support would leave a spouse eligible for public assistance at the time of separation, the court may order support to the extent needed to avoid that result.

Couples who are already married and want similar protection can compare options in our guide to postnuptial agreements vs prenuptial agreements.

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Talk to an Oregon Family Law Attorney About Your Prenup

What makes a prenup invalid in Oregon usually comes down to timing, disclosure, and fairness. Levine Law Center drafts and reviews premarital agreements built to hold up when they are tested. Call us today at 503-208-3459 to schedule a confidential consultation and make sure your agreement protects what it is meant to protect.