Washington Prenuptial Agreement
Washington prenuptial agreements are governed by RCW 19.36.010. Courts apply dual review — substantive fairness at signing and procedural fairness at enforcement — and the burden of proof falls on the party seeking to enforce the prenup, not the challenger. Independent legal counsel is effectively required, with each party's attorney expected to certify the agreement was understood and voluntary. Financial disclosure cannot be waived. Complete spousal support waivers face heavy scrutiny and are generally unenforceable — the alimony floor is judge-dependent and likely higher than most states.
Bottom line: Washington earns a C- grade. Dual review, a reversed burden of proof, effectively mandatory counsel, non-waivable disclosure, and hostile treatment of support waivers make Washington one of the harder states to enforce a prenup. Still, a prenup is far better than none.
Washington Prenup Enforceability Rating: C-
Washington Prenup Laws: Key Statutes Explained
RCW 19.36.010
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.
Procedural and Substantive “Fairness"
Washington courts take two looks at a prenup: once at the moment it was created (substantive fairness) and again at the moment it's being enforced (procedural fairness). This dual look means a prenup may be invalidated if circumstances change significantly during marriage or the parties’ commingle assets instead of keeping them in separate names.
Unconscionability Standard – Two Prong Test
A prenup is valid if: (1) it makes fair and reasonable provision for the spouse not seeking enforcement, OR (2) there was full property disclosure AND voluntary execution with independent advice and full knowledge of rights. Agreements eliminating community property rights face "zealous" scrutiny for fairness.
Spousal Support - No Bright Line, Likely Higher than Most States
Complete waivers of spousal maintenance are generally unenforceable. Courts may enforce terms regarding type, amount, and duration of support, but total waivers face heavy scrutiny, especially if one-sided or not followed during marriage.
Timing
No statutory deadline exists, but we recommend signing 60+ days before the wedding with 2-3 weeks review time to reduce challenge risk. Reach out to an attorney 4-6 months before the wedding.
Independent Counsel
Effectively required. Each party's attorney should certify their client understood terms and signed voluntarily. Lack of independent counsel can create a presumption the agreement was involuntary and therefore void.
Financial Disclosure
Full disclosure of all assets, debts, and income is required. This cannot be waived.
Low Burden to Challenge
The enforcing party bears the burden of proving validity and that the agreement was strictly observed during marriage. This makes it very easy to challenge a prenuptial agreement, as the party seeking enforcement is the one who must prove its validity.
Child Support
Child support and custody clauses are unenforceable and could undermine the entire agreement. Do not include.
Washington Prenuptial Agreement Court Cases
In re Marriage of Bernard, 165 Wash.2d 895 (2009)
Prenup invalidated as both substantively and procedurally unfair where husband worth $25 million married operations manager worth $8,000, agreement limited her to half her salary and $100,000 of his earnings as community property while eliminating her inheritance rights and spousal maintenance, and she received substantially different draft just 3 days before wedding with insufficient time for attorney review.
In re Marriage of Matson, 107 Wash.2d 479 (1986)
Prenup voided where husband worth $330,000-$830,000 married secretary with only personal effects, agreement was presented 4 days before wedding and signed on eve of wedding without independent counsel (used husband's attorney), and wife received no copy of the agreement.
In re Estate of Crawford (1986)
Prenup invalidated where wife saw first draft just 3 days before wedding, received no provision for divorce or death, was not given full disclosure of husband's property value, and was not afforded opportunity to obtain independent legal advice.
In re Marriage of Foran, 67 Wash.App. 242 (1992)
Trial court invalidated prenup for procedural unfairness where husband and attorney worked on agreement for over a month but did not provide it to wife until two days before the parties left for their wedding trip.
Kellar v. Estate of Kellar, 172 Wash.App. 562 (2012)
Court of Appeals upheld prenup as procedurally fair despite significant wealth disparity (husband worth $15-93 million, wife earned $20-25,000 as waitress) and agreement being signed 5 days before wedding, noting "there is nothing inherently fatal about signing a prenuptial agreement 5 days before the wedding."
In re Marriage of DewBerry, 115 Wash.App. 351 (2003)
Oral prenuptial agreement upheld where both well-educated working professionals agreed income and property would be separate, they continually affirmed agreement through meticulous effort to maintain separate finances during marriage, and court found "nothing unfair about two well-educated working professionals agreeing to preserve the fruits of their labor."
5-Step Checklist: How to Sign & Execute a Prenup in Washington
Step 1: Download and read the Washington prenuptial agreement
Start with our free template. It is written for Washington-specific common law under the Matson two-prong fairness test and the Bernard enforcement-time review standard. Read it in full — know what you are getting into legally with marriage. The 15+ pages is written thoroughly to include rebuttals to common legal challenges and fallback provisions. Two warnings unique to Washington: the enforcing party bears the burden of proving validity, and courts may refuse to enforce a prenup the parties didn't actually observe during the marriage.
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 or what you want the clause "to do." Save any changes as a separate alternate version — don't overwrite the original. Bring both versions 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 lawyer in your state
Find a matrimonial or divorce attorney in your state. Avvo, Findlaw, and Justia are good. Look for someone with 10+ years experience. Call or email and ask them how much to review your draft prenup and help with signing. Send them your draft.
Step 4: Meet your lawyer 4–6 months before the wedding
Our recommendation: sign the prenup before proposing. That way, you both get the legal work out of the way, and you know this is the right person to marry. Already proposed? 4–6 months before the wedding should leave you enough time to give your spouse 1–2 weeks to review the final draft and have it signed 60+ days before the wedding. Washington courts treat timing and attorney access as direct evidence of procedural fairness — Matson voided for a prenup presented 4 days before the wedding and signed the eve of the wedding, Bernard voided for a substantially different draft received just 3 days out, while Kellar upheld a signing 5 days before because other procedural factors were strong.
Step 5: Sign with your attorneys and store the agreement
Execute the agreement with both attorneys present — Matson "strongly urged" independent counsel for both parties, and where an agreement is not substantively fair, courts effectively require it to satisfy the second prong. Washington requires only a writing signed by both parties — no witnesses or notarization are mandated by statute. That said, notarization is standard practice. No attorneys present? Use a standalone notary at minimum. Each party keeps a signed original, and so should each party's attorney. Store yours somewhere secure like a safety deposit box. Create a .pdf and save it via a backup drive and email.
Washington Prenuptial Agreement: Frequently Asked Questions (2026)
What is a prenuptial agreement?
A legal contract signed before marriage that determines how assets, debts, and finances are handled if the marriage ends. We recommend assets and debts are kept separate, unless held jointly, where they are split 50/50. Alimony is modified to incentivize larger families and longer marriages, rather than divorce. A privacy clause allows the growth of an intimate, trusting relationship. A dispute resolution clause moves proceedings out of an expensive courtroom and into mediation or arbitration, lowering conflict to maintain a workable relationship.
How much does a prenup cost in Washington?
Attorney-drafted from scratch: $1,500–$5,000+ per side. The smarter approach: start with our free Washington template, draft any changes with an AI like Claude, then hire an attorney only to review and assist with signing. The bill should be around $500 per side.
Are prenups enforceable in Washington?
Yes, but Washington earns a C- rating — one of the harder states for prenup enforcement. There is no prenuptial agreement statute; courts apply strict common law scrutiny developed over decades. The enforcing party bears the burden of proving validity AND that the agreement was strictly observed during marriage. Spousal maintenance complete waivers are generally unenforceable. The "two-look" structure and community property default make Washington one of the more challenging states to enforce a prenup. A prenup is still far better than none.
What makes a prenup invalid in Washington?
Washington applies a two-prong test: (1) Is the agreement fair and reasonable to the non-enforcing party? If not — (2) Was there full disclosure of all assets AND was the agreement entered voluntarily with independent advice and full knowledge of rights? Both sub-parts of prong two must be satisfied. Common failures: presenting the agreement days before the wedding (Matson, Bernard, Foran); inadequate time for attorney review; failure to disclose all assets; significant wealth disparity combined with no independent counsel; and — uniquely — failing to actually observe the agreement's terms during the marriage. DewBerry upheld a prenup because the parties "continually affirmed" it through meticulous separate finances. Leave child custody and support out entirely.
Do I need a lawyer to get a prenup in Washington?
Functionally yes, though not technically required. Matson stated courts "strongly urge" both parties to have independent counsel before signing. Where the agreement is not substantively fair at prong one, the second prong requires voluntary execution "through independent advice and with full knowledge" — making counsel effectively required when the agreement is one-sided. Kellar upheld a prenup despite a significant wealth disparity in part because the less wealthy party had independent counsel. Use the template to cut drafting costs — don't skip the attorney.
What should a Washington prenuptial agreement include?
Our Washington template is built around six core principles:
- Separate property — assets and debts stay with the party who acquired them, minimizing conflict
- Joint assets and debts — anything both parties sign for together is split 50/50
- Marital home — ownership is tracked as a percentage of contribution, so each party gets back what they put in
- Spousal support — structured to incentivize larger families and longer marriages, not divorce
- Full financial disclosure — all assets, debts, and income over $1,000, listed in the exhibits; Washington does not permit disclosure waivers
- Privacy clause — keeps financial and personal details private, supporting a trusting relationship
Leave out child custody and support entirely — Washington courts will not enforce them and they can invalidate the rest of the agreement.
Does Washington's property law make a prenup especially important?
Yes — more so than in most states. Washington is a community property state — all income earned and property acquired during the marriage is presumptively owned 50/50 by both spouses, regardless of whose name it's in or who earned it. Without a prenup, that 50/50 rule governs everything from salaries to RSU vesting to business growth. Washington's Seattle tech economy means many couples have significant equity compensation — RSUs, stock options, and pre-IPO interests — that should be specifically identified and addressed in the prenup's financial exhibits alongside a clear plan for keeping those interests separate throughout the marriage.
How far in advance should I get a prenup in Washington?
Sign 60+ days before the wedding. Give your spouse at least two weeks to review with their own attorney. Washington has no statutory minimum but treats timing as direct evidence of procedural fairness — Matson and Foran voided prenups where the agreement was presented days before the wedding without adequate attorney access, while Kellar upheld a 5-day signing where other procedural factors were strong. Contact an attorney 4–6 months before the wedding. Best practice: sign before proposing — no time pressure, and you'll be confident in whom you are choosing to marry.
What is the "strictly observed" requirement and why does it matter?
This is Washington's most distinctive — and most overlooked — prenup rule. Courts have held that the party seeking to enforce a prenup must show not only that it was validly signed, but that the parties actually observed it during the marriage. If spouses commingled assets, treated separate property as community, jointly managed finances in ways inconsistent with the prenup, or otherwise didn't maintain the agreement's structure throughout the marriage, a court can decline to enforce it at divorce. DewBerry (2003) upheld an oral prenup specifically because the parties "made meticulous effort to maintain separate finances" throughout their marriage. The practical lesson: don't just sign a prenup — live it. Keep separate accounts, maintain separate titling, and document that you're honoring its terms year after year.
Can I completely waive spousal maintenance in Washington?
Generally no — this is one of Washington's most significant restrictions. Complete advance waivers of spousal maintenance are generally unenforceable as against public policy under RCW 26.18.020. Courts will review maintenance provisions at enforcement and may override a waiver that would leave one spouse without support — particularly after a long marriage or dramatic change in circumstances. You can include provisions modifying the type, amount, and duration of support, or establishing formulas based on marriage length. A total zero-dollar waiver, however, faces strong judicial resistance. Structure maintenance provisions thoughtfully — a sliding scale tied to marriage length is far more likely to survive enforcement-time review than a flat waiver.