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A prenuptial agreement that gets signed, notarized, and filed away can still be thrown out by a California judge years later. Not because it was fraudulent, and not because the couple didn’t mean what they wrote. It gets invalidated because the process didn’t meet the specific statutory findings a court must make before calling the agreement voluntary. That gap between a document that looks complete and one that actually survives a challenge is exactly what couples in San Diego need to understand before they sign.
At Family Law San Diego, our team is led by Garrison Klueck, a Board-Certified Family Law Specialist, a credential the State Bar of California grants only to attorneys who demonstrate a high level of accomplishment across multiple family law sub-categories. What follows is a practical breakdown of how California courts evaluate prenuptial agreements when one spouse tries to enforce them and the other disputes them.
If you’re preparing a prenuptial agreement or reviewing one you’ve been asked to sign, reach our team at (619) 577-4900.
The Presumption Courts Start With
Most people assume that a signed agreement is a valid agreement. California law works the opposite way. Under Family Code Section 1615(c), a premarital agreement is presumed to have not been executed voluntarily unless the court makes specific written or on-the-record findings. That presumption matters enormously in practice: the burden falls on the spouse trying to enforce the agreement, not the spouse challenging it.
Family Code Section 1615(a) identifies two independent grounds for invalidating a premarital agreement. First, the challenging spouse can prove it wasn’t executed voluntarily. Second, the challenging spouse can show it was unconscionable at the time of signing and that they weren’t given adequate financial disclosure. Under Section 1615(b), unconscionability is a legal question decided by the judge, not a factual question left to a jury or resolved by how fair the parties thought the deal was at the time.
What a Court Must Find to Call It Voluntary
Because voluntariness is presumed absent, a court has to make specific affirmative findings before the agreement can be enforced. These aren’t formalities; they’re substantive requirements tied to what actually happened in the days before both parties signed.
Independent Legal Counsel
Family Code Section 1615(c)(1) requires the court to find that each party was represented by independent legal counsel at signing. If a party chose not to retain counsel, they must have expressly waived that right in a separate written waiver, after being advised to seek independent legal counsel. A general acknowledgment that they were “aware of their right to an attorney” isn’t enough. This written-waiver option applies to general property provisions, but not to spousal support waivers, which carry a stricter requirement covered below.
The Seven-Day Waiting Period
Family Code Section 1615(c)(2) requires at least seven calendar days between when a party is first presented with the final agreement and when they sign it. For agreements executed on or after January 1, 2020, this clock runs from receipt of the final agreement regardless of whether the party retained counsel. AB 1380, which took effect that date, made the waiting period unconditional; it no longer depends on the status of legal representation. Before 2020, the prior standard tied the timing more directly to the counsel advisement process, and some case law from that era reflects the older framework. Agreements signed before January 1, 2020 are evaluated under the rules that applied at the time.
One practical consequence: if the agreement is revised in any substantive way after the seven-day clock starts running, the clock may restart. Late changes pushed close to a wedding date can create real enforceability problems.
Understanding & Absence of Coercion
Family Code Section 1615(c)(3) through (5) require the court to find that each party understood the agreement’s terms and their basic effect, and that consent wasn’t obtained through fraud, duress, or undue influence. These aren’t catch-all provisions. Courts look at the totality of the circumstances: who drafted the agreement, how much time the other party had to review it, whether the parties had equal access to legal counsel, and whether one party was under significant emotional or financial pressure at the time of signing.
Financial Disclosure & Unconscionability
Even when the voluntariness requirements are met, an agreement can still be invalidated on unconscionability grounds if it was substantively unfair at the time of signing and the challenging party didn’t receive adequate disclosure of the other’s financial picture.
Family Code Section 1615(a)(2) requires each party to receive a fair, reasonable, and full disclosure of the other’s property and financial obligations before signing. A party can waive the right to further disclosure in writing, but the waiver must be explicit. The California Court of Appeal’s decision in In re Marriage of Facter (2013) clarified that inadequate disclosure alone isn’t enough to void an agreement; the challenging spouse must also show substantive unfairness. Both elements have to be present together. A lopsided agreement with thorough disclosure, or poor disclosure alongside a balanced agreement, doesn’t automatically clear the bar for invalidation.
Spousal Support Waivers Face a Higher Bar
Spousal support waivers within a prenuptial agreement are treated differently from property division clauses, and the difference is significant enough that it deserves separate attention.
Family Code Section 1612 makes a spousal support waiver unenforceable if the waiving party wasn’t represented by independent legal counsel at signing. Unlike general property provisions, there’s no written-waiver alternative. If the spouse giving up spousal support rights didn’t have their own attorney review the agreement before they signed, that provision won’t hold up in court.
There’s a second layer that catches many people off guard. The California Supreme Court’s decision in In re Marriage of Pendleton & Fireman (2000) confirmed that spousal support waivers aren’t automatically void as against public policy, but left enforceability to turn on the circumstances at the time the waiver is actually invoked at divorce, not just at the time of signing. In re Marriage of Facter (2013) illustrated what that means in practice: a spousal support waiver was struck down as unconscionable based on the dramatic disparity in the parties’ incomes and assets, both at signing and at enforcement. The husband had drafted the agreement himself and held significant separate property, while the wife entered the marriage with nothing. By the time of divorce, enforcing the waiver would have left her with nothing. Courts evaluate not just whether the agreement was fair when signed, but what enforcement would actually mean when a judge is asked to apply it years later.
How Timing Can Make or Break Enforceability
Couples in San Diego often ask how close to a wedding date they can realistically finalize a prenuptial agreement. The answer depends on the substance of the agreement, not just the calendar. The seven-day waiting period attaches to the final agreement. If the parties are still negotiating material terms or making significant revisions, the clock doesn’t run on earlier drafts. An agreement signed two days before the wedding, even if both parties wanted it and understood it, can’t satisfy the statutory waiting period, and that failure creates exactly the kind of involuntariness finding that results in the agreement being set aside.
It’s also worth addressing a common misconception directly: prenuptial agreements can’t lawfully dictate child custody or child support terms. California courts determine those issues based on the child’s circumstances at the time of separation, guided by the best-interest standard, and no prior contract between the parents can override that. Couples sometimes include child-related provisions believing they’ll provide certainty; they won’t. Those provisions will be disregarded regardless of how the rest of the agreement is drafted.
Because a challenge to a prenuptial agreement surfaces during divorce proceedings rather than through a separate statute of limitations, the agreement can be scrutinized for unconscionability years or even decades after signing. The conditions in the room when both parties signed matter, but so does what the agreement looks like when one spouse asks a judge to enforce it against the other.
What This Means Before You Sign
Enforceability isn’t decided by how confident a couple felt at the signing table. It’s decided by a judge applying the specific findings required under California Family Code Section 1615, potentially long after the marriage began. An agreement that looked thorough at the time but skipped the seven-day window, didn’t include a proper counsel waiver, or relied on a spousal support cap without independent review can be set aside on grounds that had nothing to do with the parties’ intentions.
Drafting a prenuptial agreement that holds up requires working through those requirements carefully from the start, not checking a box at the end. Family Law San Diego has been handling prenuptial and postnuptial agreements for San Diego residents since 1990, and our team, led by a Board-Certified Family Law Specialist certified by the State Bar of California, builds agreements designed to withstand the scrutiny that can come years later.
If you’re preparing a prenuptial agreement or reviewing one you’ve been asked to sign, reach our team at (619) 577-4900.