A sunset clause in a Washington prenuptial agreement automatically terminates the contract after a specified period, typically ranging from 5 to 20 years of marriage. Under Washington law, prenuptial agreements remain valid indefinitely unless the parties include such an expiration provision. Washington courts evaluate these clauses using contract law principles established in In re Marriage of Matson (107 Wn. 2d 479), requiring both substantive fairness (reasonable terms) and procedural fairness (voluntary execution with full financial disclosure). When a sunset clause takes effect, the prenuptial agreement becomes null and void, and Washington's community property laws under RCW 26.16.030 govern any subsequent divorce proceedings.
Key Facts: Sunset Clauses in Washington Prenups
| Factor | Washington Requirement |
|---|---|
| Filing Fee (Divorce) | $314-$364 depending on county |
| Waiting Period | 90 days minimum (RCW 26.09.030) |
| Residency Requirement | No minimum duration; must be resident at filing |
| Grounds for Divorce | Irretrievably broken (no-fault only) |
| Property Division | Community property state |
| Prenup Statute | No specific statute; governed by contract law |
| Enforceability Standard | Two-prong Matson test (substantive + procedural fairness) |
| Sunset Clause Validity | Enforceable if clearly drafted and voluntarily agreed |
What Is a Sunset Clause in a Washington Prenuptial Agreement?
A sunset clause is a contractual provision that causes a prenuptial agreement to expire automatically after a predetermined period or triggering event. In Washington State, couples commonly set sunset periods of 5, 10, 15, or 20 years of marriage. For example, a prenuptial agreement might state: "This agreement shall become null and void upon the tenth anniversary of the parties' marriage." Once the sunset clause activates, the prenup's protections disappear entirely, and Washington's default community property rules under RCW 26.16.030 control asset division in any subsequent divorce.
Washington law does not specifically regulate sunset clauses in prenuptial agreements. Instead, Washington courts apply general contract law principles to evaluate whether the clause is enforceable. The controlling precedent is In re Marriage of Matson (107 Wn. 2d 479, 1986), which established that prenuptial agreements must satisfy both substantive and procedural fairness requirements. A clearly drafted sunset clause that both parties voluntarily agreed to, with full understanding of its implications, will generally be enforced by Washington courts.
Types of Sunset Clauses in Washington Prenups
Washington couples can structure sunset clauses in several ways:
Full Termination Clauses specify that the entire prenuptial agreement expires after a set number of years. A typical provision might read: "This Agreement shall terminate in its entirety upon the parties' 15th wedding anniversary."
Partial Phase-Out Clauses gradually reduce certain restrictions over time while maintaining others. For instance, a provision might specify: "After 10 years of marriage, Article III (spousal maintenance waiver) shall become void, while all other provisions remain in effect."
Event-Based Clauses tie expiration to life events rather than calendar dates. Common triggers include the birth of a child, one spouse completing education, or paying off premarital debt.
Progressive Asset-Sharing Clauses increase the less-wealthy spouse's share over time. An example structure might provide: $0 if divorced within 5 years; $500,000 if divorced between 5-10 years; $1,000,000 if divorced between 10-15 years; and equal community property division after 15 years.
Why Washington Couples Include Sunset Clauses in Prenups
Sunset clauses serve multiple strategic purposes for Washington couples entering marriage. Approximately 25-30% of prenuptial agreements nationally include some form of sunset provision, though exact Washington-specific statistics are not publicly reported. The primary reasons couples add these clauses include demonstrating good faith in the marriage's longevity, addressing concerns about fairness in long-term marriages, providing negotiation flexibility during prenup discussions, and acknowledging that financial circumstances change significantly over decades of marriage.
Advantages of Including a Sunset Clause
Sunset clauses can demonstrate commitment and trust. A wealthier spouse who includes a sunset clause effectively communicates: "I believe this marriage will last, and after we have built a life together for X years, I want you to share fully in what we have accumulated." This gesture can ease tensions during prenup negotiations when one party feels vulnerable or undervalued.
Sunset clauses can also make prenuptial agreements more likely to be enforced by Washington courts. Under the Matson two-prong test, courts examine whether agreements are substantively fair at the time of enforcement. An agreement that leaves one spouse with nothing after 30 years of marriage may be deemed unconscionable and set aside. A sunset clause that phases out restrictions after 10-20 years addresses this fairness concern proactively.
Disadvantages and Risks of Sunset Clauses
The primary risk of including a sunset clause is losing intended protections if the marriage survives past the expiration date. A Washington business owner who protects a company worth $2 million at marriage might find themselves sharing a $20 million enterprise equally if the prenup sunsets after 15 years. For high-net-worth individuals, this can represent millions of dollars in unexpected exposure.
Timing complications can also arise. In a notable case example, a couple's prenup contained a sunset clause expiring on their 7th anniversary. The husband filed for divorce four months before that date, but court proceedings extended past the anniversary. The court ruled the sunset clause took effect because the parties were still legally married on the triggering date, voiding the entire agreement. The husband lost all prenup protections because the agreement did not specify that filing for divorce would preserve the agreement's validity.
Washington's Legal Framework for Prenuptial Agreements
Washington State has no specific statute governing prenuptial agreements. Instead, Washington courts rely on contract law principles and the landmark case In re Marriage of Matson (107 Wn. 2d 479, 1986) to evaluate enforceability. This approach gives couples significant flexibility in drafting terms but also requires careful attention to fairness requirements.
The Matson Two-Prong Test for Enforceability
Washington courts evaluate prenuptial agreements, including sunset clauses, using the two-prong test established in In re Marriage of Matson:
Prong 1 (Substantive Fairness): The agreement's terms must be objectively fair and reasonable when signed. Courts examine whether the agreement leaves either spouse in an unconscionable position. An agreement that awards one spouse 100% of assets while the other receives nothing after a lengthy marriage will likely fail this prong.
Prong 2 (Procedural Fairness): Both parties must have entered the agreement voluntarily with full knowledge of the other's financial situation. This requires: (1) complete disclosure of all assets, debts, and income; (2) sufficient time to review the agreement before signing (ideally 3-6 months before the wedding, with a minimum of 4-8 weeks); (3) no coercion, duress, or undue pressure; and (4) ideally, independent legal counsel for each party.
RCW 26.16.120: Community Property Agreements
While Washington lacks a prenuptial agreement statute, RCW 26.16.120 authorizes married couples to enter agreements concerning community property status and disposition. This statute provides the legal foundation for couples to opt out of Washington's default community property rules. Under this provision, agreements must be in writing, signed by both parties, witnessed, acknowledged, and certified in the same manner as deeds to real estate.
Community Property vs. Separate Property in Washington
Under RCW 26.16.030, Washington is one of nine community property states. Without a prenuptial agreement:
| Property Type | Definition | Division at Divorce |
|---|---|---|
| Community Property | Assets/income acquired during marriage | Divided equitably (typically 50/50) |
| Separate Property | Assets owned before marriage, or received as gift/inheritance during marriage | Generally stays with owning spouse |
| Commingled Property | Separate property mixed with community funds | May become partially or fully community |
A prenuptial agreement can override these default rules. For example, a prenup might specify that all income earned by either spouse remains their separate property, or that certain business interests remain separate regardless of value increases during marriage. When a sunset clause terminates such provisions, the default community property rules resume.
How to Draft an Enforceable Sunset Clause in Washington
Drafting a sunset clause that Washington courts will enforce requires precision and foresight. Vague or ambiguous language can lead to disputes or the clause being interpreted differently than intended. A well-drafted sunset clause should specify: (1) exactly which provisions expire; (2) the precise triggering event or date; (3) what happens to the agreement upon divorce filing; and (4) how the parties can modify or waive the sunset provision.
Essential Elements of a Washington Sunset Clause
Specific Time Period or Triggering Event: Use clear, unambiguous language. "This agreement expires on the parties' 10th wedding anniversary" is preferable to "This agreement expires after approximately 10 years."
Divorce Filing Preservation Clause: Include language preserving the agreement if divorce is filed before the sunset date. Example: "This agreement shall remain in full force and effect if either party files a Petition for Dissolution of Marriage prior to the sunset date, regardless of when the dissolution is finalized."
Severability Language: Specify whether the sunset applies to the entire agreement or only certain provisions. "Upon the 15th anniversary, Articles II and IV shall terminate, while all other provisions remain enforceable."
Modification Procedures: Include provisions allowing parties to extend or eliminate the sunset clause by written agreement. "The parties may, by written instrument signed by both parties and witnessed in the same manner as this Agreement, extend or eliminate the sunset provision contained herein."
Sample Sunset Clause Language for Washington Prenups
The following example demonstrates comprehensive sunset clause drafting:
"SECTION 12. SUNSET PROVISION
12.1. This Agreement shall become null and void in its entirety upon the twentieth (20th) anniversary of the parties' marriage, provided that both parties are then living and are still legally married to each other.
12.2. Notwithstanding Section 12.1, if either party files a Petition for Dissolution of Marriage in any court of competent jurisdiction prior to the twentieth (20th) anniversary of the parties' marriage, this Agreement shall remain in full force and effect until the entry of a final decree of dissolution, regardless of when such decree is entered.
12.3. The parties may, by mutual written agreement executed with the same formalities as this Agreement, extend, modify, or eliminate this sunset provision at any time during the marriage."
Washington Divorce Process After a Sunset Clause Takes Effect
When a sunset clause terminates a prenuptial agreement, divorcing spouses in Washington are governed entirely by state law. The divorce filing fee ranges from $314 to $364 depending on the county (as of June 2026; verify with your local court clerk). Washington imposes a mandatory 90-day waiting period from filing and service before any divorce can be finalized under RCW 26.09.030. The state recognizes only one ground for divorce: that the marriage is irretrievably broken.
Property Division Without a Prenup
Once a sunset clause voids a prenuptial agreement, Washington courts divide property under the "just and equitable" standard of RCW 26.09.080. While Washington is a community property state, courts are not required to divide assets exactly 50/50. Factors considered include:
The nature and extent of community property; the nature and extent of separate property; the duration of the marriage; the economic circumstances of each spouse; and the desirability of awarding the family home to the custodial parent.
Spousal Maintenance (Alimony) Considerations
If a prenuptial agreement waived spousal maintenance and that waiver expires with a sunset clause, Washington courts will evaluate maintenance based on statutory factors under RCW 26.09.090. Courts consider: the financial resources of the party seeking maintenance; the time necessary to acquire education or training for appropriate employment; the standard of living established during marriage; the duration of the marriage; the age and health of both parties; and the ability of the paying spouse to meet their own needs while paying maintenance.
Alternatives to Sunset Clauses in Washington Prenups
Couples who want flexibility without automatic termination have several alternatives:
Periodic Review Clauses require the parties to review and potentially renegotiate the agreement at specified intervals (every 5 years, for example) without automatically voiding it.
Progressive Modification Clauses adjust specific terms over time. For example: "After 10 years of marriage, the spousal maintenance cap shall increase from $5,000 to $10,000 per month."
Postnuptial Agreements allow couples to modify or replace their prenuptial agreement at any point during the marriage. Under Washington law, postnuptial agreements are evaluated under the same Matson fairness standards as prenuptial agreements.
Conversion Clauses specify that separate property becomes community property after a certain period, while other prenup provisions remain intact.
Challenging a Sunset Clause in Washington Courts
While Washington courts generally enforce clearly drafted sunset clauses, challenges can arise. Common grounds for challenging a sunset clause or its application include:
Ambiguous Language: If the sunset clause language is unclear, courts must interpret the parties' intent. Ambiguities are typically construed against the drafting party.
Fraud or Nondisclosure: If one party failed to disclose material financial information when the prenup was signed, the entire agreement (including the sunset clause) may be voidable.
Procedural Defects: If the original prenup was signed under duress or without adequate time for review, the sunset clause may be unenforceable along with the rest of the agreement.
Unfair Application: In rare cases, courts may refuse to apply a sunset clause if doing so would produce an unconscionable result. However, this is uncommon when the clause was clearly drafted and voluntarily agreed to.
Frequently Asked Questions About Sunset Clauses in Washington Prenups
Do prenuptial agreements automatically expire in Washington State?
No, prenuptial agreements in Washington do not automatically expire. A prenup remains valid and enforceable for the entire duration of the marriage unless the agreement specifically includes a sunset clause or expiration provision. Under Washington contract law, the agreement continues until divorce, death, or voluntary revocation by both parties. To include an expiration mechanism, couples must explicitly draft a sunset clause into the prenuptial agreement.
What is the most common sunset clause duration in Washington prenups?
The most common sunset clause durations are 10, 15, and 20 years of marriage. Couples often choose 10 years as a reasonable period to demonstrate the marriage's stability while still providing meaningful protection during the early years. Some couples prefer longer periods (15-20 years) to maintain protections through child-rearing years. Shorter periods (5-7 years) are less common because they may not provide adequate protection for significant assets or business interests.
Can a Washington court refuse to enforce a sunset clause?
Yes, Washington courts can refuse to enforce a sunset clause under limited circumstances. If the underlying prenuptial agreement fails the Matson two-prong test (substantive and procedural fairness), the entire agreement including the sunset clause may be invalidated. Courts may also decline enforcement if the sunset clause language is ambiguous, if one party signed under duress, or if material fraud or nondisclosure occurred. However, clearly drafted sunset clauses that were voluntarily agreed to with full disclosure are generally enforced.
What happens to my assets when a prenup sunset clause takes effect in Washington?
When a sunset clause terminates a prenuptial agreement, Washington's default community property laws under RCW 26.16.030 govern your assets. Any property acquired during the marriage becomes community property subject to equitable division. Separate property (assets owned before marriage or received as gifts/inheritance) generally remains separate, but commingled assets may become partially community property. If you divorce after the sunset clause takes effect, the court divides assets under the "just and equitable" standard without regard to the expired prenup.
Can my spouse and I extend or eliminate a sunset clause during our marriage?
Yes, Washington couples can modify or eliminate a sunset clause through a written postnuptial agreement. The modification must be signed by both parties with the same formalities as the original prenup (written, signed, witnessed, and acknowledged). Both parties should have independent legal counsel review any modifications. Courts evaluate postnuptial agreements under the same Matson fairness standards as prenuptial agreements, so modifications made under duress or without full disclosure may be unenforceable.
Does filing for divorce preserve my prenup if the sunset date is approaching?
It depends on the prenup's specific language. A well-drafted sunset clause includes a "divorce filing preservation" provision that keeps the agreement in effect if divorce is filed before the sunset date. Without such language, courts have ruled that sunset clauses take effect based on the marriage's legal duration, not when divorce proceedings began. In one notable case, a husband who filed four months before the sunset date lost his prenup protections because the divorce was not finalized until after the anniversary. Always include explicit language addressing this scenario.
How much does it cost to add a sunset clause to a Washington prenup?
Adding a sunset clause typically does not significantly increase the overall cost of drafting a prenuptial agreement in Washington. Attorney fees for comprehensive prenup drafting range from $1,500 to $10,000+ depending on complexity and attorney experience. The sunset clause itself is one provision among many and does not require separate drafting fees. However, if you want multiple phase-out provisions or complex triggering conditions, expect additional attorney time and corresponding fees.
Are sunset clauses in prenups enforceable if we move to another state?
Generally, yes. Most states follow the principle that contracts valid where executed remain valid when parties relocate. However, the new state's courts will apply their own laws when interpreting and enforcing the agreement. If you relocate from Washington to a state with different prenup requirements (such as a state that adopted the Uniform Premarital Agreement Act), consult with a local attorney to ensure your sunset clause remains enforceable. Consider including a choice-of-law provision specifying that Washington law governs the agreement.
What should I do if my prenup sunset clause is about to expire?
If your sunset clause is approaching and you want to maintain protections, you have several options. First, you and your spouse can execute a postnuptial agreement extending or replacing the sunset clause. This requires mutual consent and should be done with independent legal counsel for both parties. Second, if both parties agree, you can create an entirely new postnuptial agreement with updated terms reflecting your current financial situation. Third, if you are considering divorce and want to preserve the prenup's protections, consult with a family law attorney immediately about filing before the sunset date, ensuring your agreement has language preserving validity upon filing.
Can a sunset clause apply to only part of my prenup in Washington?
Yes, sunset clauses can be drafted to apply to specific provisions rather than the entire agreement. For example, a partial sunset clause might terminate spousal maintenance waivers after 15 years while keeping separate property designations in effect indefinitely. This approach allows couples to maintain certain protections (like business interests or inheritance rights) while phasing out provisions that may become unfair over time (like support waivers). The key is drafting precise language that clearly identifies which provisions expire and which remain in effect.