Why California Prenups Get Thrown Out and How to Avoid It

Three professionals, two women and one man, reviewing and signing a document at a table.

A prenuptial agreement can give couples greater certainty about property, debts, business interests, and financial expectations if their marriage ends. But simply having both people sign a document before the wedding does not guarantee that a California court will enforce every provision.

California has specific requirements governing premarital agreements. When a prenup is challenged during divorce, questions about voluntariness, timing, financial disclosure, legal representation, and the terms of the agreement itself can become critical.

What Can a California Prenup Cover?

California’s Uniform Premarital Agreement Act allows prospective spouses to make agreements concerning a wide range of financial matters.

A properly structured prenup can address rights and obligations concerning property, what happens to property upon separation or divorce, certain estate-planning matters, life insurance benefits, and other financial issues permitted by law.

Couples may also address spousal support, although California imposes additional restrictions on provisions that modify or waive it.

There are limits. For example, a premarital agreement cannot adversely affect a child’s right to support. Parents cannot use a prenup to eliminate a future child’s legal right to financial support.

Reason #1: The Agreement Was Not Signed Voluntarily

One of the principal grounds for challenging a California premarital agreement is that it wasn’t executed voluntarily.

This is about more than whether someone physically signed the document.

A court evaluating voluntariness can consider circumstances surrounding execution, including whether there was duress, fraud, or undue influence and whether the person had the capacity to enter the agreement.

Reason #2: The Seven-Day Rule Was Ignored

California law includes an important timing protection for premarital agreements.

Under Family Code section 1615, for agreements subject to the current statutory requirements, the party against whom enforcement is sought generally must have had at least seven calendar days between the time that party was first presented with the final agreement and the time the agreement was signed.

This requirement is easy to underestimate.

Giving someone a draft well in advance does not necessarily mean the timing requirement has been satisfied if material negotiations continue and the final agreement is presented too late.

Reason #3: One Person Did Not Receive Adequate Financial Disclosure

A prenup often determines rights involving assets that would otherwise become important during divorce. It’s difficult to make an informed agreement about those rights without knowing what property and financial obligations actually exist.

California law therefore makes financial disclosure an important part of enforceability.

A premarital agreement may be vulnerable when it was unconscionable when signed and the challenging spouse was not provided a fair, reasonable, and full disclosure of the other person’s property or financial obligations, did not validly waive further disclosure, and did not otherwise have adequate knowledge of those finances.

Reason #4: The Parties Tried Using the Same Lawyer

A prenup involves two people whose legal interests may differ.

One attorney can’t simply function as independent legal counsel for both future spouses when their interests conflict. Each party having separate counsel that can also provide strong evidence that both people had an opportunity to understand the agreement and obtain advice about its consequences.

California’s voluntariness requirements contain specific protections for an unrepresented party, including requirements involving waiver of independent counsel and information about the agreement’s terms and effects.

Spousal-support provisions deserve even greater caution. California law specifically states that a provision concerning spousal support is not enforceable against a person who was not represented by independent counsel at the time the agreement was signed.

Close-up of a prenuptial agreement document with a pen and wooden gavel on a wooden surface.

Why Prenups Matter for Men Entering Marriage With Significant Assets

For men entering marriage with a business, real estate, investments, substantial savings, or financial obligations from an earlier relationship, a prenup can be an important part of financial planning.

But an agreement provides little certainty if it was rushed or drafted without considering California’s requirements.

Men’s Legal Center can help men in California understand how premarital agreements interact with separate and community property, spousal support, business interests, and other family-law concerns. Make sure you reach out for your free case review today.