California Prenuptial Agreement
California prenuptial agreements are governed by California Family Code §§ 1610–1617. Courts apply dual review — unconscionability is assessed at both signing and divorce — and California adds two unusual requirements: independent legal counsel is mandatory for any spousal support provisions, and a seven-day waiting period must pass between the final draft and signing.
Bottom line: California earns a C- grade. Dual review, mandatory counsel, a strict waiting period, and unpredictable spousal support scrutiny make California one of the harder states for prenup enforceability. A prenup is still far better than none.
How California's Prenup Laws Rank: C-
California Prenup Laws: Key Statutes Explained
California Family Code §§ 1610-1617
Separate Property
All assets can remain separate property, avoiding costly divorce settlements. Joint assets and debts titled in both names are split 50/50 as marital property.
Unconscionability at Execution AND Enforcement
Courts review unconscionability at execution (signing) AND enforcement (divorce), requiring a high level of alimony for a prenup to be enforceable. Marriage of Zucker (2022) rejected a prenup that paid the wife $6,000/month because she enjoyed a $60,000/month lifestyle during marriage. 10% was found too little, we think courts might accept 25-50% of statutory amounts (10-20% of payor’s income), but it remains at a judge’s discretion. If they disagree, the alimony modification will be rejected and the full statutory amount will apply (40% of payor’s income - 50% of recipient’s).
Timing
Mandatory seven-day waiting period between presentation of the final agreement and signing. We recommend signing 60+ days before the wedding with 10+ days to review. Reach out to an attorney 4-6 months before the wedding with your PerfectPrenup draft.
Independent Counsel
Independent counsel is REQUIRED. Spousal support waivers or limitations are unenforceable without independent counsel, regardless of fairness.
Financial Disclosure
"Full disclosure" of assets, debts and income is required, and waivers are heavily scrutinized. Disclose all assets over $1,000 so they aren’t split 50/50 later. PerfectPrenup includes a disclosure waiver, but don’t rely on it alone as California courts have a hostile approach to prenups.
Low Burden to Challenge
Challenging party bears burden of proof, but many avenues to invalidate: dual-review unconscionability for spousal support (execution AND enforcement), strict seven-day waiting period with no substantive changes, mandatory independent counsel for any spousal support provisions, full disclosure requirements heavily scrutinized, and no clear threshold for acceptable support levels (10% of statutory rejected too low). California is hostile to prenups, but the only thing worse would be to marry without one.
Child Support
Child support and custody clauses are unenforceable and could undermine the entire agreement. Do not include.
California Prenuptial Agreement Court Cases
California courts consistently invalidate prenups with large income/asset disparities and spousal support waivers that leave one spouse unable to maintain reasonable lifestyle, while upholding prenups between parties with similar financial positions.
In re Marriage of Zucker (2022) 75 Cal.App.5th 1025
Court struck down $6,000/month spousal support cap as unconscionable when husband earned $250,000/month and wife enjoyed a ~$60,000/month marital lifestyle—merely 10% of probable statutory award deemed "oppressive."
In re Marriage of Facter (2013) 212 Cal.App.4th 967
Complete spousal support waiver invalidated when attorney husband ($1M/year, $10M+ assets) divorced unemployed high school graduate wife with no assets after 16-year marriage due to "dramatic disparity" and "inequality of bargaining power", while asset separation upheld.
In re Marriage of Miotke (2019) 35 Cal.App.5th 849
Mutual spousal support waiver enforced when both spouses had similar earning histories as architects and wife had $107,000 net worth at signing while working part-time.
In re Marriage of Howell (2011) 195 Cal.App.4th 1062
Pre-2002 spousal support waiver upheld because 2002 Family Code amendments requiring independent counsel for support provisions were not applied retroactively.
In re Marriage of Cadwell-Faso (2011) 191 Cal.App.4th 945
Prenup signed 6 days (not 7) after final draft upheld when both parties represented by counsel throughout months-long negotiations—holding later prospectively superseded by AB1380 (2020).
In re Marriage of Hill & Dittmer (2011) 202 Cal.App.4th 1046
Prenup upheld against claims of fraudulent disclosure when evidence showed valid waiver and months-long negotiation period.
Last v. Superior Court (2023) 94 Cal.App.5th 30
Prenups are presumed involuntary and unenforceable unless trial court makes written findings that all Family Code §1615(c) requirements were satisfied.
In re Marriage of Clarke & Akel (2018) 19 Cal.App.5th 914
Seven-day waiting period begins when spouse receives the final draft of prenuptial agreement.
5-Step Checklist: How to Sign & Execute a Prenup in California
Step 1: Download and read the California prenuptial agreement
Start with our free template, written for California-specific statutes and case law under California Family Code §§ 1610–1617. Read it in full. The 15+ pages include provisions to opt out of California's community property default and rebuttals to common legal challenges. Pay close attention to the spousal support section — it's the clause California courts attack most aggressively.
Step 2: Draft changes on your own
See a clause you don't like? Copy it into an AI like Claude, explain what you'd like to change, and save any edits as a separate version — don't overwrite the original. Bring both to your attorney review. Note: AI is often gender-biased and crafts terms beyond what is legally required. Push back on its output.
Step 3: Find a family law attorney in California — both of you
Independent counsel is legally required for any spousal support provision to be enforceable under Family Code § 1612(c). Find separate attorneys. Avvo, Findlaw, and Justia are good starting points. Look for 10+ years of California family law experience. Contact attorneys 6+ months before the wedding — California's procedural requirements take time to satisfy correctly.
Step 4: Finalize the agreement at least 7 days before signing
Our recommendation: sign the prenup before proposing. That way, you both get the legal work out of the way, and you know if this is someone you really want to marry. Already proposed? California law requires a mandatory 7-calendar-day waiting period between delivery of the final agreement and signing (Family Code § 1615(c)(2)(B), as amended by AB 1380, effective January 1, 2020). No substantive changes are permitted during that window — the clock restarts if terms change. We recommend delivering the final draft 10+ days before signing and signing 60+ days before the wedding.
Step 5: Sign with both attorneys present and store the agreement
Execute with both attorneys present — their presence is documented evidence of voluntariness and required for spousal support modifications. Under Last v. Superior Court (2023), a prenup is presumed unenforceable unless a court makes written findings that all § 1615(c) requirements were satisfied (both parties represented or counsel waived in writing; 7-day waiting period observed; unrepresented party fully informed in writing; no duress, fraud, or undue influence; parties had capacity to contract). Each party keeps a signed original; each attorney keeps a copy. Store yours in a safe deposit box and save a PDF to a backup drive.
California Prenuptial Agreement: Frequently Asked Questions (2026)
1. What is a prenuptial agreement in California?
A prenuptial agreement (called a "premarital agreement" in the California Family Code) is a written contract signed before marriage that determines how assets, debts, income, and spousal support are handled if the marriage ends. It is governed by California's Uniform Premarital Agreement Act, Family Code §§ 1610–1617. In a community property state like California, a prenup is the primary tool to opt out of the default 50/50 split of everything earned and acquired during marriage.
2. How much does a prenup cost in California?
Attorney-drafted from scratch: $2,500–$10,000+ per side. Because independent counsel is required for any spousal support provision to be enforceable, both parties typically retain attorneys. Starting with our free template usually brings the bill to $750–$1,500 per side.
3. Are prenups enforceable in California?
Yes, but California earns a C- rating — one of the harder states to enforce a prenup in. Courts apply dual unconscionability review: at signing and again at divorce. Procedural rules (the 7-day waiting period, independent counsel for support clauses, full disclosure) are strictly enforced. A properly executed prenup is still far better than no prenup.
4. What makes a prenup invalid in California?
The most common grounds: missing the 7-day waiting period, no independent counsel for the spousal support clause (Facter), support terms that are unconscionable at divorce (Zucker), incomplete financial disclosure, duress (rushed signing close to the wedding), or fraud. Including child custody or child support provisions can also taint the agreement if there is no severability clause.
5. Do I need a lawyer for a prenup in California?
Effectively, yes. Independent counsel is required by Family Code § 1612(c) for any spousal support clause to be enforceable. A party can waive counsel in writing, but the waiver must be voluntary, fully explained, and memorialized in a signed declaration. In practice, both sides having separate attorneys is the cleanest path to enforceability.
6. What is California's 7-day rule for prenups?
Under Family Code § 1615(c)(2)(B), the party signing must have at least 7 calendar days between receiving the final agreement and signing it. AB 1380 (effective January 1, 2020) made this apply even when both parties have counsel. No substantive changes are permitted during the waiting period — the clock resets if terms change (Clarke & Akel, 2018). Keep dated proof of delivery; boilerplate language reciting that seven days passed is not binding if the facts say otherwise.
7. Can you waive alimony in a California prenup?
Yes, but it's the hardest clause to enforce. The waiving party must have independent counsel at signing (Fam. Code § 1612(c)), and the waiver must not be unconscionable at the time of divorce. Complete waivers in long marriages with large income disparities tend to fail (Facter). Mutual waivers between spouses with comparable earning capacity tend to hold (Miotke). Include a severability clause so the asset-separation provisions survive even if the waiver is struck.
8. How does California's community property law affect my prenup?
It's the primary reason to have one. Without a prenup, all income earned and assets acquired during marriage are split 50/50 at divorce — including salary, business growth, retirement contributions, and your spouse's debts. A properly drafted prenup opts both parties out of community property entirely and lets you keep what you earn separate.
9. How far in advance should I sign a prenup in California?
Sign 60+ days before the wedding, with the final draft delivered at least 10 days before signing. Contact attorneys 4–6 months out — California's procedural requirements take time to satisfy correctly. Best practice: sign before proposing. No wedding pressure means no duress argument, and you'll know whether this is the right person to marry.
10. Can a spousal support waiver be challenged in a California prenup?
Yes — aggressively. California is one of the only states that applies dual unconscionability review: the waiver must be fair both at signing and at the time of divorce (Fam. Code § 1612(c)). Zucker (2022) struck a $6,000/month fixed cap when the husband's earnings grew to ~$250,000/month — use a percentage-of-income formula instead of a fixed dollar amount, and tie support to length of marriage so the number scales with circumstances.
11. Can a prenup protect a business in California?
Yes. A prenup can preserve a business owned before marriage as separate property, including any appreciation during marriage. Without one, increases in business value attributable to either spouse's efforts during marriage are presumed community property under Pereira and Van Camp. The prenup should name the business, address goodwill, and waive any community claim to growth, earnings, and reinvested profits.
12. Can a prenup protect inheritance or gifts in California?
Inheritance and gifts received during marriage are already separate property under Family Code § 770. A prenup adds protection by addressing commingling — if inherited funds get deposited into a joint account or used to buy a jointly-titled asset, they can lose their separate character. The prenup can pre-define commingled assets as separate property and waive any community reimbursement claim.
13. Can a California prenup cover debts?
Yes. Without a prenup, debts incurred during marriage are presumed community debts under Family Code § 910, even if only one spouse signed for them. A prenup can keep each party's debts separate — both pre-marital debts and those incurred during marriage. This matters most when one party owns a business, has student loans, or expects to take on high-risk obligations.
14. Can a California prenup be changed after marriage?
Yes. Under Family Code § 1614, a premarital agreement can be amended or revoked only by a written agreement signed by both parties. No consideration is required. Amendments after marriage are technically postnuptial agreements and face heightened fiduciary scrutiny under Family Code §§ 721 and 1100 — both spouses owe each other a duty of good faith and fair dealing, stricter than the standard for prenups.
15. What is the difference between a prenup and a postnup in California?
Timing and scrutiny. A prenup (premarital agreement) is signed before marriage and governed by §§ 1610–1617. A postnup is signed during marriage and governed by the higher fiduciary duty standard of §§ 721 and 1100. Postnups are harder to enforce because courts presume the benefiting spouse gained an unfair advantage and must rebut that presumption. If you want financial protection, a prenup is far easier to enforce than a postnup — get one before the wedding.
16. Can I get a prenup in California if I have kids from a previous marriage?
Yes, and you should. A prenup is one of the cleanest ways to keep pre-marriage assets earmarked for children from a prior relationship. The agreement can lock in separate-property status for accounts, real estate, and inheritances you want to pass to your kids, and can waive your new spouse's community claim to growth on those assets. Pair the prenup with an updated estate plan — a will or trust — since a prenup alone won't direct what happens at death.
17. Are infidelity clauses enforceable in a California prenup?
No. California courts have refused to enforce "lifestyle" clauses that impose financial penalties for cheating (Diosdado v. Diosdado, 2002). California is a no-fault divorce state, and judges treat infidelity penalties as contrary to public policy. Including one risks tainting the rest of the agreement if there's no severability clause — leave it out.
18. Can I get a last-minute prenup before my California wedding?
Not safely. The 7-calendar-day waiting period under Family Code § 1615(c)(2)(B) is strict — no substantive changes during the window, or the clock resets. Signing within days of the wedding also creates a duress argument that's hard to defeat. If the wedding is less than two weeks away, the cleanest path is to delay signing, marry without a prenup, then execute a postnuptial agreement — though postnups face higher fiduciary scrutiny under §§ 721 and 1100.
19. Should I get a prenup in California if I earn significantly more than my partner?
Yes — this is the textbook case for one. Without a prenup, every dollar you earn during marriage becomes community property split 50/50 at divorce, plus you may owe long-term spousal support. A prenup lets you keep your income and asset growth as separate property and structure any support payments on a predictable formula. The income gap also makes the prenup easier to draft: the higher earner has the clearer incentive, and a well-structured percentage-of-income support clause survives scrutiny better than a flat waiver.
20. Can a prenup protect a stay-at-home parent in California?
Yes, but who you pick as a partner, and the strength of that relationship, is more important. Our prenups aren't designed to fund a large payout for a spouse who wants to leave a union — they're built to align both parties around the shared work of raising a family, financially and domestically. Our prenups don't reward divorce, but longer marriages and larger families. If a guaranteed exit payout is the goal, marriage probably isn't — and keeping your career is the better hedge.