California Prenup Requirements: What Makes Your Agreement Valid
Thinking about a prenup in California? You’re not alone.
Key Takeaways
A valid California prenup must follow strict state-specific legal requirements.
Full financial disclosure is essential for an enforceable California prenup.
The 7-day review rule is mandatory before signing a California prenup.
Spousal support waivers require independent legal counsel in California.
Without a prenup, California community property laws control your financial future.
More and more couples are choosing to create a prenuptial agreement before they say “I do”—and for good reason. A prenup gives you both clarity, protection, and peace of mind. But California has its own set of rules. If you want your prenup to be enforceable, it needs to follow specific legal requirements.
Let’s break down what makes a California prenup valid—and how to avoid common pitfalls.
What Is a Prenup, Really?
A prenuptial agreement, or “prenup,” is a written contract between two people before they get married. It typically lays out how assets, debts, income, and expenses will be handled during the marriage and what happens if the marriage ends.
In California, your prenup can address things like:
- Property ownership
- Division of assets and debts
- Spousal support (aka alimony)
- Business ownership
- Inheritance rights
But there are limits. For example, a prenup can’t include child custody or child support terms. Those decisions are made based on what’s best for the child at the time of separation or divorce.
California Prenup Requirements: 6 Rules You Must Follow
California follows the Uniform Premarital Agreement Act (UPAA), plus a few extra state-specific rules. Here’s what your prenup must include to be enforceable:
1. The Agreement Must Be in Writing
Verbal prenups don’t count. If it’s not on paper and signed, it’s not enforceable.
2. Both People Must Sign It Before the Wedding
The prenup has to be signed by both parties before the marriage takes place. If you sign it after you’re already legally married, it’s a postnup—and that follows different rules.
3. Each Person Must Fully Disclose Their Finances
You both need to be honest about what you own and what you owe. Hiding money or assets can invalidate the entire agreement.
4. The Agreement Must Be Voluntary
No one should feel pressured or tricked into signing. If one person felt forced, the court might throw out the prenup.
5. You Must Have at Least 7 Days to Review It
California law requires a 7-day waiting period between when the final version of the prenup is presented and when it’s signed. This gives both parties time to review the terms—and consult an attorney if they want to.
6. Independent Legal Counsel Is Strongly Advised
While not strictly required if you waive the right in writing, having your own lawyer is the best way to protect your interests. In fact, if the prenup includes a waiver of spousal support, the person giving up that right must have had their own attorney. Otherwise, that clause won’t be enforceable.
What Can Invalidate a California Prenup?
Even if you follow the basic rules, a prenup can still be thrown out by the court if:
- One person didn’t disclose all their assets or debts
- One person didn’t understand what they were signing
- The terms are “unconscionable” (extremely unfair)
- One person signed under duress or without proper time to think
Can You Waive Spousal Support in a California Prenup?
Yes—but it’s tricky. California courts take spousal support seriously. If your prenup waives or limits alimony, that clause will only be enforceable if:
- The waiver is clearly stated and not overly unfair at the time of enforcement
- The person waiving support had their own legal counsel at the time of signing
Otherwise, the court might ignore the spousal support section—even if the rest of the prenup is valid.
California Is a Community Property State—Here’s Why That Matters
By default, California law says that most property acquired during a marriage belongs to both spouses equally. That means a 50/50 split in divorce.
A prenup lets you opt out of that default rule. For example, you can agree that:
- Each person keeps what they earn
- Specific property or income stays separate
- A business owned by one spouse remains theirs alone
Without a prenup, you’re bound by California’s “default prenup”—which was written by lawmakers, not by you.
FAQs About California Prenups
Do I need a lawyer for a California prenup?
It’s not legally required, but highly recommended. If you’re waiving spousal support, legal representation is a must for that clause to be valid.
Can we write our own prenup?
You can start the conversation and draft ideas together, but always have a qualified attorney review and finalize it to make sure it meets California’s legal requirements.
Can we update our prenup after we’re married?
Yes! You can create a postnuptial agreement. Just like a prenup, it must be in writing, signed by both parties, and meet legal standards.
Final Thoughts: A Valid Prenup = Peace of Mind
Getting a prenup in California isn’t about planning for divorce. It’s about creating a clear, fair, and honest financial plan with the person you love. When done right, a prenup protects both partners and supports a stronger marriage built on transparency and trust.
Start your prenup journey today Want a customized prenup that meets California’s legal standards and your personal goals? Get a personalized prenup consultation at Prenups.com