Are Prenuptial and Postnuptial Agreements Enforceable in California? Common Grounds for a Challenge

A prenuptial or postnuptial agreement is only as valuable as its ability to withstand a challenge in court. In California, family law judges set aside marital contracts far more often than many spouses expect.

Agreements rarely fail because judges dislike prenups. Instead, they fail because California enforces strict technical rules during drafting and signing. A prenuptial agreement can be fair on its face, yet completely invalid if execution deadlines or attorney mandates are ignored.

Furthermore, California law evaluates marital contracts using two different legal standards at two separate points in time:

• Property Division Terms: Evaluated for fairness and complete financial disclosure as of the date the contract is signed.
• Spousal Support Terms: Evaluated for fairness as of the date of divorce, which could be decades later.

At Sarieh Law Offices, our team has represented clients across Orange County in complex family law matters for over twenty years. Below is an overview of California statutory requirements, common drafting mistakes, and the higher legal standards applied to postnuptial agreements.

The Legal Framework: Family Code Sections 1600 through 1617

California has adopted the Uniform Premarital Agreement Act, located in California Family Code Sections 1600 through 1617. Two specific statutes handle most enforceability issues:

• Family Code Section 1615: Governs general enforceability, voluntary consent, and the fairness test for property terms.
• Family Code Section 1612: Outlines what can be included in an agreement and sets a strict rule for spousal support waivers under subdivision (c).

To be valid, an agreement must be in writing and signed by both parties. Beyond basic contract principles, challenges usually stem from procedural mistakes.

The Seven-Day Rule and Execution Timeline

Procedural mistakes under California Family Code Section 1615 are the most common reason prenuptial agreements are thrown out.

To prove that an agreement was signed voluntarily, California law requires a waiting period of at least seven calendar days. This timeline runs between the moment a party is first presented with the final, complete version of the agreement (and advised to seek independent counsel) and the date the agreement is signed.

Key Rules for the Seven-Day Timeline

• Calendar Days, Not Business Days: The seven-day rule includes weekends and legal holidays.
• Material Changes Reset the Clock: Under FC Section 1615(c)(2), making major edits to the draft creates a new document. Handing a revised version to a spouse a few days before the wedding invalidates the previous waiting period.
• Representation or Proper Waiver: The seven-day period must run while the party is represented by an attorney or after signing a detailed written waiver under FC Section 1615(c)(3).

An agreement presented during wedding week is vulnerable to claims of duress. Agreements signed at a rehearsal dinner are almost impossible to defend in court.

Independent Legal Representation and Spousal Support Rules

For an agreement to be binding, legal representation must be independent. An attorney chosen or paid for by the wealthier spouse can create conflict-of-interest claims.

For property division terms, an unrepresented spouse must sign a separate written waiver detailing the specific rights being given up. The explanation must be written in a language in which that spouse is fluent.

Strict Requirement for Spousal Support Waivers

Under California Family Code Section 1612(c), any clause that limits or waives spousal support is completely unenforceable if the party giving up support did not have an independent lawyer at the time of signing.

Unlike general property division terms, there is no exception or waiver option for spousal support. If a party does not have their own attorney, any spousal support waiver in the agreement is void as a matter of law.

Two Unconscionability Standards in California Law

California applies two separate fairness standards evaluated at different times, which can confuse divorcing spouses.

Long-Term Marriage Risks

A spousal support waiver signed by two young professionals with similar incomes might be reasonable when signed. However, if the couple divorces twenty years later after one spouse stayed home to raise children, the court may rule that enforcing the waiver is unfair based on current financial realities.

What Can and Cannot Be Included in a Premarital Agreement

Family Code Section 1612 establishes clear boundaries on permissible subjects in a premarital contract.

Permissible Financial Terms

Spouses can contract regarding various financial matters, including:

• Rights and obligations regarding separate and community property
• Management and control of real estate, bank accounts, and investments
• Property distribution upon separation, divorce, or death
• Estate planning instruments, including wills and trusts, to carry out the agreement
• Ownership rights and death benefits from life insurance policies
• Choice of law rules governing the interpretation of the contract

Prohibited Terms

Two major categories cannot be restricted by a marital contract:

1. Child Support: Children have an absolute right to financial support. Parents cannot waive or reduce child support obligations in a premarital agreement.
2. Child Custody and Visitation: Courts make custody decisions based on the best interests of the child at the time of separation. Pre-arranged custody agreements are not binding.

Clauses imposing financial penalties for infidelity or dictating household chores are generally unenforceable. Including personal lifestyle clauses can make a court view the entire contract with skepticism.

Common Grounds for Challenging an Agreement

Beyond statutory rules, traditional contract defenses apply to marital agreements:

• Duress: Extreme pressure that overcomes a person’s free will, such as presenting a prenup right before the wedding when guests have already arrived.
• Fraud or Concealment: Understating assets, hiding accounts, or misrepresenting income during disclosures.
• Lack of Capacity: Intoxication, illness, or cognitive impairment at the time of signing.
• Defective Postnuptial Agreements: Contracts signed during marriage face a different, higher standard of review.

Postnuptial Agreements and Fiduciary Duties

Postnuptial agreements signed during marriage face higher scrutiny than premarital contracts due to the fiduciary relationship between spouses under Family Code Section 721(b).

Presumption of Undue Influence

Under California case law, including In re Marriage of Haines and In re Marriage of Burkle, any marital agreement that provides a financial advantage to one spouse over the other creates an automatic presumption of undue influence.

To enforce a postnuptial agreement, the advantaged spouse must prove that:

• The agreement was entered into voluntarily.
• Full and complete financial disclosures were exchanged.
• The disadvantaged spouse received fair value and had independent legal counsel.

When a postnuptial agreement is created to address financial issues such as undisclosed debt or gambling losses, the document must detail all transactions clearly. Under Family Code Section 1101, courts can award up to 100 percent of an undisclosed asset to the injured spouse if asset concealment is proven.

Protecting Business Assets and Handling Litigation

For business owners in Orange County, protecting separate property businesses from community claims is often a top priority.

Protecting Separate Property Business Growth

Under California community property rules, if a spouse owns a separate business but contributes labor during the marriage, the community earns an interest in the business’s increased value under the Pereira or Van Camp accounting standards.

A well-drafted prenuptial agreement protects family businesses by:

• Classifying the business and all future growth as separate property
• Waiving community reimbursement claims for executive effort and reinvested earnings
• Establishing clear valuation methods and compensation structures

How Prenuptial Challenges Are Litigated

When an agreement’s validity is challenged during a divorce, Orange County courts often separate the trial to determine enforceability before dividing property or deciding support. The party seeking enforcement must prove compliance with the seven-day rule, attorney representation rules, and written disclosure delivery.

Keeping complete negotiation records, including emails, draft histories, and signed disclosure schedules, is essential to defending the contract in court.

Best Practices for Creating a Binding Agreement

To ensure a prenuptial or postnuptial agreement holds up in court, follow these key steps:

• Start Months in Advance: Avoid last-minute drafting. The seven-day rule is a minimum requirement, not a target.
• Hire Separate Attorneys: Each spouse needs an independent, self-chosen lawyer. This is mandatory for spousal support waivers.
• Provide Full Written Disclosures: Attach complete schedules of assets, debts, and income. Comprehensive disclosure eliminates set-aside arguments later.
• Provide Translations If Needed: If a spouse is not fluent in English, provide the agreement and written disclosures in their native language.
• Keep Terms Reasonable: An agreement that leaves one spouse completely destitute after a long marriage invites a court finding of unconscionability.
• Document the Process: Save all correspondence, disclosure documents, and transmittal records to build an evidentiary file.

What to Do If You Are Handed an Agreement to Sign

If your partner asks you to sign a prenuptial agreement, keep these principles in mind:

• Do Not Rush: Take your time reviewing the document. The seven-day rule is a minimum timeline, not a deadline.
• Select Your Own Lawyer: Do not use an attorney recommended or paid for by your partner.
• Demand Complete Financial Disclosures: Request full financial documentation, including tax returns and account statements, attached directly to the contract.

• Aged prenuptial agreement with wedding rings and family photos spanning decades, symbolizing California marital agreement enforceability

  Evaluate Support Provisions Carefully: Spousal support waivers are governed by strict standards and can have major consequences decades later.

• Negotiate Terms: Prenuptial agreements are negotiable. You can request sunset clauses, support floors, or financial adjustments based on the length of the marriage.

Being asked to sign a prenuptial agreement is a business negotiation. Taking time to seek independent legal advice helps ensure the final contract is fair and balanced.

Schedule a Consultation with Sarieh Law Offices

Whether you need to draft an enforceable marital agreement or challenge an invalid one, success depends on specific details: execution timelines, attorney representation, written disclosures, and statutory standards.

Sarieh Law Offices handles prenuptial and postnuptial agreements, as well as complex family law litigation, throughout Orange County. Contact our office today to schedule a consultation with an experienced family law attorney.

References

• California Family Code sections 1600 to 1617, Uniform Premarital Agreement Act
• California Family Code section 1612, content of premarital agreements, including subdivision (c) on spousal support
• California Family Code section 1615, enforcement of premarital agreements
• California Family Code section 721, fiduciary relationship between spouses
• California Family Code section 1101, breach of fiduciary duty and remedies

This article provides general information about California law and is not legal advice for any specific situation.