How to Write a Basic Prenup in California (w/Examples) + FAQs

Writing a basic prenup in California means drafting a written contract before marriage that defines property rights, debt responsibility, and (optionally) spousal support, then signing it voluntarily with full financial disclosure and at least a 7-day review period. California governs prenuptial agreements under the Uniform Premarital Agreement Act (UPAA), codified at California Family Code §§ 1610–1617.

The governing statute creates a problem most couples miss: if you skip even one procedural step, a judge can throw out the entire agreement years later during divorce. The California Supreme Court in In re Marriage of Bonds showed how voluntariness, counsel, and disclosure decide whether a prenup survives. A 2024 Harris Poll for the Harris Onward study found that 50% of married or engaged Americans support prenups, up from 42% in 2022, yet only about 15% actually sign one.

Here is what you will learn from this guide:

• 📜 The exact California Family Code rules that make a prenup enforceable in 2026
• ✍️ How to draft clear clauses for property, debts, and spousal support with sample language
• ⚖️ How to meet the 7-day rule, disclosure duty, and independent counsel requirement
• 🚫 The most common mistakes that void prenups and how to avoid them
• 💡 Real scenarios, named examples, and FAQs that answer the questions judges actually ask

What a California Prenup Is and Why It Matters

A prenuptial agreement, often called a prenup or premarital agreement, is a written contract signed by two people before they marry. Under California Family Code § 1610, the contract takes effect the moment the marriage becomes legal. The agreement lets the couple opt out of parts of California’s default community property system.

California is a community property state. That means income earned and property bought during marriage is owned 50/50 by both spouses unless the couple agrees otherwise. The California Courts self-help portal on property and debt in divorce explains how this default rule splits assets when no prenup exists.

A basic prenup lets you change those default rules for your own marriage. You can keep a business, an inheritance, or a retirement account as separate property. You can also decide who pays which debts, what happens to appreciation on a home, and whether spousal support is waived.

The consequence of skipping a prenup is simple but severe. Without one, California’s community property rules apply with no room for negotiation at divorce. A common misconception is that prenups are only for the rich, but data from the American Academy of Matrimonial Lawyers shows millennials drive most of the recent growth.

The Problem a Prenup Solves

Marriage is both a romantic bond and a legal business partnership. California law treats spouses as economic partners the moment they say I do. The California Department of Justice consumer guide notes that financial disputes drive many divorces.

A prenup solves the uncertainty problem by locking in the financial rules of the marriage in advance. Without it, a judge applies default statutes to facts that may not match what the couple actually intended. The consequence is often a long, expensive trial over who owns what.

For example, imagine Priya, a software engineer in San Jose who owns pre-marital Apple stock. Without a prenup, any dividends reinvested during marriage may become community property. With a simple separate-property clause, Priya keeps her stock and its growth, and her spouse avoids a costly fight later.

Legal Requirements Under California Family Code

Every enforceable California prenup must meet rules spelled out in Family Code § 1615. The statute says a prenup is unenforceable if the challenging spouse proves it was signed involuntarily or was unconscionable when signed without full disclosure. These rules matter because they give judges a roadmap for tossing sloppy agreements.

Writing and Signature Rule

The agreement must be in writing and signed by both parties, per Family Code § 1611. Oral prenups are void in California, period. The consequence of a handshake deal is that the entire promise disappears in court.

A real-world example shows the stakes. Marcus, a restaurant owner in Los Angeles, told his fiancée he would keep his food truck as separate property, but they never wrote it down. At divorce five years later, the truck was treated as community property, and Marcus paid his ex half its value.

A common misconception is that text messages or emails can substitute for a signed contract. They cannot. Only a fully executed, signed writing satisfies § 1611.

Voluntariness and the 7-Day Rule

Family Code § 1615(c) is the voluntariness test. The statute says a prenup is involuntary unless the party had at least 7 calendar days between first receiving the final agreement and signing it. This rule was tightened after the fallout from In re Marriage of Bonds, where baseball star Barry Bonds’ prenup was challenged for being signed the day of the wedding.

The consequence of skipping the 7-day window is that the entire prenup can be thrown out. Judges treat this as a bright-line rule, not a suggestion. A common misconception is that waiving the 7 days is fine if both sides agree, but the waiver itself is invalid for the party without counsel.

For example, Elena in San Diego received her final prenup on June 1 and signed it on June 9. She cleared the 7-day rule. If she had signed on June 7, the rule would be broken and her fiancé could attack the contract years later.

Independent Legal Counsel

The party giving up rights must either have independent counsel or expressly waive counsel in a separate writing, under Family Code § 1615(c)(1). If a spousal support waiver exists, the party waiving support must have had independent counsel at signing per Family Code § 1612(c). No waiver of counsel cures a missing-counsel spousal support waiver.

The consequence of skipping this step is that the spousal support waiver is unenforceable no matter how clear the language is. A common misconception is that hiring one lawyer for both spouses is fine. It is not; one lawyer cannot ethically represent both sides under the California Rules of Professional Conduct.

A named example helps here. David and Leah in Sacramento each hired their own family law attorney from the State Bar of California lawyer referral service. Each lawyer gave written advice and signed a certification. Their prenup later survived a challenge because the counsel box was checked cleanly.

Full Financial Disclosure

Each party must give a fair and reasonable disclosure of property and financial obligations, per Family Code § 1615(a)(2). Most attorneys attach a Schedule of Assets and Debts style exhibit to the prenup. The disclosure must list bank accounts, real estate, businesses, retirement accounts, and debts.

The consequence of hiding an asset is severe. If the other side proves hidden property and shows the agreement is unconscionable, the court can void the prenup under § 1615(a). A common misconception is that rough estimates are enough. Specific dollar figures and supporting documents are far safer.

For example, James, a startup founder in Palo Alto, disclosed his equity at “approximately $2 million” without showing cap tables. His fiancée later proved the real value was $12 million, and a court struck key clauses for lack of fair disclosure.

What You Can and Cannot Include

Family Code § 1612 lists the topics a California prenup can cover. The statute also places strict limits on what the agreement cannot do. Knowing the line between the two keeps your contract enforceable.

Allowed Clauses

A basic prenup can assign each spouse’s rights in property, whether acquired before or during marriage. It can decide who manages and controls property, direct how property passes at death, and name which state’s law governs. It can also require a will or trust to carry out the plan.

Spousal support (alimony) waivers or limits are allowed but must pass the In re Marriage of Pendleton & Fireman test. The waiver must not be unconscionable at enforcement, the waiving party must have had counsel, and both must have understood the consequences. The consequence of missing any prong is that the spousal support clause is tossed.

Debt allocation is another common clause. You can say student loans, credit card debt, or business loans brought into the marriage stay separate. A common misconception is that creditors must honor your prenup; they do not, but between spouses the allocation still controls.

Forbidden Clauses

Child support and child custody cannot be predetermined by a prenup, per settled California case law and the public-policy rules in Family Code § 1612(b). Judges decide these issues based on the child’s best interest at the time of divorce. The consequence of including such a clause is that the clause is void even if both spouses agree.

Lifestyle clauses like weight limits, chore lists, or infidelity penalties are also disfavored. Courts usually refuse to enforce them as against public policy. A common misconception, fueled by celebrity gossip, is that these clauses are standard; in California, they are not.

Illegal, unconscionable, or punitive terms are also out. The California Courts will strike terms that shock the conscience or punish a spouse for leaving the marriage.

For example, Rachel in Beverly Hills signed a prenup with a clause charging her $100,000 for each affair. A family law judge called the clause unenforceable, but the rest of the prenup survived because it had a severability clause.

Step-by-Step: How to Write a Basic California Prenup

Writing a basic prenup is a process, not a single document. Each step protects the final contract from later attack. Skipping any step raises the chance a judge will toss the whole agreement.

Step 1: Start Early

Begin drafting at least 60 to 90 days before the wedding. This gives time for two rounds of edits, full disclosure, and the mandatory 7-day review. The consequence of waiting until the week before the wedding is obvious: you lose the voluntariness defense.

A common misconception is that last-minute prenups are fine if both sides are calm. Judges often infer pressure from timing alone. The American Bar Association family law section recommends starting 90 days out.

For example, Chloe and Ben in Oakland started drafting four months before their wedding. They each had time to hire counsel, swap financial documents, and negotiate terms without stress.

Step 2: Gather Full Financial Information

Each spouse lists all assets, debts, income, and expected inheritances. Pull bank statements, tax returns, deeds, cap tables, 401(k) statements, and loan balances. Attach these as exhibits to the prenup.

The consequence of thin disclosure is that a court can void the agreement under § 1615. A common misconception is that future assets do not need to be disclosed; expected inheritances and vesting equity should be listed to be safe. The IRS gift tax page is useful when valuing prior gifts.

Step 3: Hire Separate Attorneys

Each spouse hires an independent California family law attorney. Use the State Bar of California’s Certified Lawyer Referral Services to find a lawyer. Expect fees of $1,500 to $7,500 per side for a basic prenup in 2026.

The consequence of sharing one lawyer is conflict of interest and likely loss of the spousal support waiver. A common misconception is that a notary can substitute for an attorney; it cannot. Notaries only verify identity and signatures, not legal advice.

Step 4: Draft the Agreement

Start with clear recitals naming both parties, the upcoming wedding date, and the intent to opt out of certain community property rules. Then write clauses on property characterization, debt allocation, spousal support, and death provisions. Close with boilerplate on severability, governing law, and amendments.

For example, a separate property clause might read: “All property listed on Exhibit A owned by [Spouse 1] before marriage, and all rents, profits, income, and appreciation from that property during marriage, shall remain the sole and separate property of [Spouse 1].” A spousal support waiver might read: “Each party knowingly and voluntarily waives any right to spousal support from the other, having been advised by independent counsel.”

The consequence of vague drafting is litigation over meaning. A common misconception is that online templates are one-size-fits-all; California has unique rules that generic templates miss.

Step 5: Exchange, Review, and Wait 7 Days

Once the final draft is ready, deliver it to both parties in writing. Start the 7-day clock. Neither party should sign until day 8 at the earliest.

The consequence of signing early is automatic involuntariness under § 1615(c)(2). A common misconception is that emailing a PDF does not start the clock; it does, as long as the delivery is documented.

Step 6: Sign Before a Notary

Both parties sign the final prenup in front of a California notary public. Attach exhibits, counsel certifications, and waiver forms. Store originals in a fireproof safe and give each spouse a signed copy.

The consequence of skipping notarization is not fatal, but it weakens proof of identity. A common misconception is that digital signatures are always valid; California accepts them under the Uniform Electronic Transactions Act, but many family law attorneys still prefer wet ink.

Three Realistic California Prenup Scenarios

The table below lays out the three most common fact patterns and what happens under a basic prenup versus without one. Each row shows the couple’s setup in the left column and the likely outcome in the right column.

Scenario 1: The Tech Equity Couple

Scenario 2: The Blended Family

Scenario 3: The Business Owner

Sample Clause Language You Can Adapt

Below are three sample clauses written in plain English. These are starting points, not finished contracts. Always have a California family law attorney tailor them.

Property Characterization Clause

“The parties agree that all property, real or personal, acquired by either party before the date of marriage, and all rents, profits, income, interest, dividends, and appreciation derived from that property during the marriage, shall remain the sole and separate property of the acquiring party. A complete list of each party’s separate property is attached as Exhibit A (for [Spouse 1]) and Exhibit B (for [Spouse 2]).”

The consequence of using this clause correctly is a clean separate property regime that survives commingling. A common misconception is that adding a spouse’s name to a deed does not change ownership; under Family Code § 2581, joint title creates a community property presumption, so a transmutation clause is wise.

Debt Allocation Clause

“Each party shall remain solely responsible for all debts, obligations, and liabilities incurred before the date of marriage, including but not limited to student loans, credit card balances, and business debts. Neither party’s earnings during the marriage shall be reached to satisfy the other party’s separate debts, to the extent permitted by California Family Code § 911.”

The consequence of this clause is that a creditor may still chase marital earnings, but between spouses, the responsible party pays. A common misconception is that creditors are bound by prenups; they are not.

Spousal Support Waiver Clause

“Each party, having been represented by independent counsel and having been fully advised of their rights, knowingly and voluntarily waives any right to request, receive, or enforce spousal support or alimony from the other party in any proceeding for legal separation, dissolution, or annulment.”

The consequence of a valid waiver is that neither spouse can ask for alimony at divorce. A common misconception is that courts always enforce waivers; they do not if the waiver is unconscionable at the time of enforcement under Pendleton & Fireman.

Mistakes to Avoid When Drafting

The California Courts handle thousands of prenup disputes every year. Most losing agreements fail for the same handful of reasons. Avoiding these mistakes takes your contract from shaky to solid.

• Signing within 7 days of delivery, which violates Family Code § 1615(c)(2) and creates automatic involuntariness
• Using one lawyer for both spouses, which triggers conflicts under the Rules of Professional Conduct and voids spousal support waivers
• Hiding assets or using vague estimates instead of full disclosure under § 1615(a)(2), which lets a court set the whole agreement aside
• Including child custody or child support terms, which are void under Family Code § 1612(b) and public policy
• Adding lifestyle clauses (weight, chores, infidelity penalties), which California courts usually refuse to enforce
• Skipping a severability clause, so one bad clause can drag down the whole contract
• Copy-pasting an out-of-state template that ignores California’s community property rules and 7-day requirement
• Failing to update the prenup after a major event like a business sale, inheritance, or the birth of a child
• Using oral side promises that contradict the written contract, which are barred by the parol evidence rule
• Forgetting to attach and date the full Schedule of Assets and Debts as an exhibit, leaving disclosure unprovable

Each mistake has a concrete consequence. Missing the 7-day rule voids voluntariness, missing counsel voids the support waiver, and missing disclosure voids the whole contract.

Do’s and Don’ts for California Prenups

Use this quick checklist while drafting. Each point has a reason grounded in California law.

• Do start 60–90 days before the wedding because timing is evidence of voluntariness
• Do hire separate attorneys so each side gets conflict-free advice under § 1615(c)(1)
• Do attach detailed financial schedules because full disclosure is required by § 1615(a)(2)
• Do use clear severability and governing-law clauses so one bad clause does not kill the deal

• Do store signed originals in a fireproof safe or law firm vault for easy proof years later

• Don’t sign on the wedding day because courts treat it as presumptive duress

• Don’t share a lawyer because the spousal support waiver will fail
• Don’t hide or round off assets because unconscionability plus non-disclosure voids prenups
• Don’t include child custody or support clauses because they are void as against public policy
• Don’t use a generic internet template because California’s UPAA rules are stricter than most states

Pros and Cons of Signing a Basic Prenup

A prenup is a tool, not a cure-all. Weigh the benefits and drawbacks before spending money on drafting.

• Pro: Protects pre-marital assets like businesses, stock, and inheritances from community property treatment
• Pro: Clarifies debt responsibility, which helps if one spouse has student loans or business debt
• Pro: Speeds up and cheapens any future divorce by removing big-ticket fights over property
• Pro: Protects children from prior relationships by locking in inheritance paths under Probate Code rules

• Pro: Encourages open financial conversations before marriage, which builds trust long term

• Con: Costs $3,000 to $15,000 or more in 2026 when both sides hire counsel

• Con: Can feel unromantic or create tension during wedding planning
• Con: May be set aside if any procedural step is missed, so cheap prenups often fail
• Con: Cannot govern child custody, child support, or future conduct, limiting its reach
• Con: May need updates (a postnup under Family Code § 1500) after big life changes, which adds future cost

Key California Cases and Statutes to Know

A handful of authorities shape every California prenup. Knowing them helps you spot weak drafting fast.

In re Marriage of Bonds (2000)

The California Supreme Court upheld Barry Bonds’ prenup despite his then-fiancée signing without her own lawyer the day before the wedding. The ruling pushed the Legislature to tighten the rules, producing the 7-day rule and counsel requirement in § 1615. The consequence is that post-2002 prenups face a much stricter voluntariness test than Bonds itself did.

In re Marriage of Pendleton & Fireman (2000)

The California Supreme Court in Pendleton & Fireman ruled that spousal support waivers are not automatically void as against public policy. But the waiver must be voluntary, made with counsel, and not unconscionable at enforcement. A common misconception is that any waiver works; under § 1612(c), it works only when all three prongs are met.

Family Code §§ 1610–1617

These sections are the core UPAA in California. Section 1611 requires a writing, § 1612 lists allowed topics, § 1613 sets the effective date, § 1614 covers amendments, § 1615 controls enforceability, § 1616 handles void marriages, and § 1617 sets the statute of limitations. Every drafter should read these in full on Leginfo.

Filing, Storage, and Updating Your Prenup

California prenups are not filed with any court before divorce. The signed contract stays private between the spouses. Proper storage and smart updating keep it usable decades later.

Where to Store the Signed Original

Keep at least one original in a fireproof safe at home, and give a copy to each attorney. A digital scan uploaded to an encrypted cloud drive provides a backup. The consequence of losing every copy is that enforcement becomes a swearing match about what the contract said.

When and How to Update

Big life events call for a review. New children, business sales, inheritance, real estate purchases, or a move out of California all justify an update. A signed postnuptial agreement under Family Code § 1500 can modify or replace a prenup during marriage, though postnups face even tougher fiduciary duty scrutiny under Family Code § 721.

A common misconception is that a prenup is a “set and forget” document. In practice, the best prenups are reviewed every 5 to 7 years.

Federal and Tax Angles to Consider

Although prenups are governed by California state law, federal tax and benefits rules still apply. Income tax filing, estate tax, and retirement benefits can all be affected by how your prenup classifies property.

Retirement plans under ERISA have their own rules. A spouse’s right to a share of a 401(k) can only be waived after marriage, not in a prenup, so many couples sign a matching waiver form after the wedding. The consequence of ignoring this is that the prenup’s retirement waiver is unenforceable under federal law.

The IRS innocent spouse rules mean joint tax liability is not fully controlled by a prenup either. A smart prenup says how spouses allocate tax refunds and liabilities between themselves, even though the IRS still treats them jointly. A common misconception is that filing separately avoids all joint liability; California’s community property rules still split income on state returns.

FAQs

Is a California prenup enforceable if we sign it the week before the wedding?

No. Signing within 7 days of first receiving the final draft creates automatic involuntariness under Family Code § 1615(c)(2), which lets a judge throw out the entire agreement during divorce.

Can we write our own prenup without lawyers?

No. You can physically draft it yourselves, but any spousal support waiver is void without independent counsel, and DIY prenups routinely fail on disclosure and voluntariness challenges in California family court.

Does a California prenup cover child custody?

No. Family Code § 1612(b) and public policy forbid predetermining child custody or child support in a prenup; judges decide those issues based on the child’s best interest at the time.

Is a prenup only useful for wealthy people?

No. Middle-income couples use prenups to protect student loan debt, small businesses, retirement accounts, and children from prior relationships, making them useful at nearly every income level in 2026.

Can a prenup waive spousal support in California?

Yes. Waivers are allowed under Family Code § 1612(c) if each party had independent counsel, signed voluntarily, and the waiver is not unconscionable when enforcement is sought per Pendleton & Fireman.

Do both spouses need separate lawyers?

Yes. Independent counsel is required to enforce a spousal support waiver, and strongly recommended for every other clause to prove voluntariness and full understanding.

Can we include infidelity or lifestyle clauses?

No. California courts usually refuse to enforce weight, chore, or cheating penalty clauses as against public policy, though a severability clause can save the rest of the prenup.

Will a prenup from another state be honored in California?

Yes. California generally honors valid out-of-state prenups under Family Code § 1617 and conflict-of-laws rules, provided the agreement did not violate California public policy when signed.

Do we need to notarize a California prenup?

Yes. Notarization is strongly recommended even though the statute does not strictly require it, because notary acknowledgment provides strong proof of identity and signature if the contract is later challenged.

Can we change or cancel a prenup after marriage?

Yes. Under Family Code § 1614, a prenup can be amended or revoked only by a signed written agreement, usually in the form of a postnuptial agreement subject to fiduciary duties under § 721.

How much does a basic California prenup cost in 2026?

Yes, there is a typical range: about $1,500 to $7,500 per spouse for a basic prenup, and $10,000 or more per side for complex estates involving businesses or trusts.

Does a prenup protect assets from creditors?

No. A prenup controls ownership between spouses, but outside creditors are not bound by it and can still pursue community property for joint or individual debts under Family Code § 910.