Signing a prenuptial agreement and having it enforced in court are two different things. Couples often learn this distinction for the first time during divorce proceedings, when a party challenges an agreement that everyone assumed was airtight. A single procedural misstep, a clause the legislature categorically prohibits, or circumstances that have shifted dramatically since the wedding day can be enough to unwind what both spouses believed was settled.
California’s rules on prenuptial agreement validity are technical and layered. With 40 combined years of drafting and litigating prenuptial agreements in Los Angeles, our attorneys at Law Offices of Korol & Velen have seen which agreements hold up and which ones fall apart. Often the reasons are ones the parties never anticipated. What follows is a plain-language breakdown of what California courts actually examine when a prenup is put to the test.
What California Courts Look for Before Enforcing a Prenup
The governing statute is California Family Code Section 1615, which sets out several independent requirements: the agreement must be in writing and signed by both parties, execution must be voluntary, each party must make full and fair financial disclosure, and the terms must not be unconscionable. Every requirement stands on its own. A court that finds any one of them missing can decline to enforce the agreement, even if the other three are satisfied.
The California Uniform Premarital Agreement Act places the burden of proof on the party challenging the agreement. If you want to void a prenup, you carry the weight of demonstrating it fails. The California Supreme Court reinforced this in In re Marriage of Bonds (2000) 24 Cal.4th 1 (the Barry Bonds case), confirming that a challenging party must show by a preponderance of the evidence that execution was involuntary or that another statutory requirement wasn’t met.
One rule tightened in 2020 deserves attention. Under FC §1615(c)(2), the final version of the prenuptial agreement must be presented to both parties at least seven calendar days before signing. This now applies regardless of whether both parties have independent legal counsel. That change closed a loophole some attorneys previously used to argue the deadline was satisfied when both sides had lawyers, even if the agreement landed on the table days before the wedding.
How the Way a Prenup Was Signed Can Void It
Procedural invalidity concerns the circumstances of execution, not the content of the agreement. A prenup can be perfectly worded and still be unenforceable because of how or when it was presented.
Violating the seven-day rule under FC §1615(c)(2) is a standalone basis for challenge. Presenting the final document a day or two before the ceremony creates a strong presumption of involuntariness. Courts reason that a party scrambling to review a complex legal document while managing wedding logistics and family pressure isn’t freely and voluntarily consenting.
Independent legal counsel is a separate requirement. Under FC §1615(c)(1), each party must either be represented by their own attorney at signing or must sign a written waiver of counsel. This is a separate document acknowledging the right to independent representation and choosing to waive it. Using shared counsel or failing to document a waiver in the required form can void the agreement on this basis alone.
Voluntariness is assessed under the totality of the circumstances. In re Marriage of Bonds identified several factors courts weigh: threats of canceling the wedding, leverage tied to immigration status, language barriers that prevented real comprehension of the terms, and significant power imbalances between the parties. None of these factors is automatically dispositive, but each can contribute to a finding that a signature wasn’t truly voluntary.
When the Terms Themselves Get a Prenup Thrown Out
Even when a prenup is procedurally sound, its terms can be challenged independently. Substantive invalidity focuses on what the agreement says rather than how it was signed.
Unconscionability under FC §1615(a)(2) is evaluated at the time the agreement was executed. To void a prenup on this ground, the challenging party must show both that the terms were unconscionable when signed and that they lacked fair financial disclosure of the other party’s assets and obligations. Spousal support waivers carry an additional layer: under FC §1612(c), a waiver can also be struck down if enforcing it at the time of divorce would be unconscionable. The California Supreme Court addressed this standard in In re Marriage of Pendleton and Fireman (2000) 24 Cal.4th 39, holding that such waivers may be upheld unless unconscionable at the time enforcement is sought. A prenup that seemed balanced when both parties earned similar incomes may look very different after one spouse left the workforce for a decade to raise children, making a spousal support waiver potentially unconscionable at enforcement even if it was valid when signed.
Some provisions are categorically unenforceable regardless of how clearly they were agreed to:
- Child custody and child support terms are governed by FC §3020 and FC §4001, which require courts to determine those issues based on the child’s best interests at the time of separation, not by a contract signed before the child existed.
- Clauses that incentivize divorce are void as contrary to public policy, including provisions that give one spouse a large payout for filing or penalize a spouse financially for staying in the marriage.
- Lifestyle or morality clauses that attempt to regulate personal behavior during the marriage are generally unenforceable under California law.
Inadequate financial disclosure is another ground that can void an entire agreement. Under FC §1615(a)(2)(A), each party must make a fair and reasonable disclosure of their property and financial obligations. Hiding assets, materially undervaluing a business interest, or omitting significant debts isn’t just a problem with specific provisions. It can be grounds to void the agreement in its entirety.
The Spousal Support Waiver: A Stricter Standard Most People Miss
Spousal support waivers operate under a stricter standard than every other prenuptial provision. FC §1612(c) requires that any clause waiving or limiting spousal support be accompanied by actual independent legal counsel for the waiving party at signing. Unlike other prenup provisions, there’s no written-waiver workaround available. A party can’t sign a document acknowledging the right to counsel and choosing to proceed without it when spousal support is on the table. Actual representation is required. And even then, a California court retains authority to refuse enforcement if doing so would be unconscionable at the time of divorce. A spouse who left a career to raise children for fifteen years may have a strong argument that enforcing the waiver produces an unconscionable result, regardless of what was signed before the wedding.
When a prenup’s validity is actively disputed in litigation, the Los Angeles County Superior Court can order temporary spousal support while a bifurcated trial on the agreement’s validity proceeds. The Stanley Mosk Courthouse handles a significant volume of these proceedings in LA County, and its judges regularly work through high-asset divorces where prenuptial agreements are central to the dispute.
What Happens When Only Part of a Prenup Is Invalid
Invalidity doesn’t always mean the entire agreement is void. California courts have discretion to sever unenforceable provisions and uphold the remainder when the invalid terms are separable from the valid ones. Whether severance is appropriate depends on whether the objectionable terms were central to the parties’ overall agreement or peripheral to it.
That said, including categorically unenforceable provisions (such as child custody clauses) can have consequences beyond the voided term. A court may read their presence as evidence that the agreement wasn’t drafted with adequate legal guidance, inviting broader scrutiny of the document as a whole.
Because unconscionability of a spousal support waiver is assessed at the time of enforcement, an existing prenup shouldn’t be treated as permanently settled. If circumstances have changed substantially since signing (a shift in earning capacity, a long career break, the birth of children, or a dramatic change in either party’s net worth), it’s worth having the agreement reviewed before a dispute arises rather than after.
A California prenuptial agreement has to pass two independent tests: how it was executed and whether its terms remain conscionable at the time of divorce. Passing one doesn’t mean passing the other. Whether you’re preparing to sign, considering a review of an existing agreement, or facing a challenge in litigation, the analysis requires close attention to Family Code provisions, the specific facts of execution, and how circumstances have evolved since the wedding. Our attorneys at Law Offices of Korol & Velen have spent decades working through exactly these questions for clients in Los Angeles, and we handle each matter directly. To talk through where your agreement stands, reach out to us at (818) 962-4669.