Washington Prenuptial Agreement
Washington has no prenup statute. Courts apply a common law two-prong fairness test (Matson/Bernard): a prenup is valid if it's either substantively fair, or — if not — was signed with full disclosure, independent counsel, and voluntary consent. Both prongs are assessed at signing, and the burden falls on the enforcing party, not the challenger. Disclosure cannot be waived, independent counsel is effectively required, and complete spousal support waivers 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.
How Washington's Prenup Laws Rank: 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.
Fairness 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 — a former state senator and fruit rancher with assets in excess of $200,000 — married his former secretary, agreement was presented 4 days before wedding and signed on eve of wedding using husband's attorney as sole counsel, and wife received no copy of the agreement.
In re Estate of Crawford, 107 Wash.2d 493 (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)
1. Are prenuptial agreements enforceable in Washington?
Yes, but Washington is one of the harder states to enforce a prenup. Washington has no prenuptial agreement statute — courts apply a common law two-prong fairness test developed over decades of case law (Matson, Bernard). A prenup is enforceable if it passes either prong: (1) the agreement is substantively fair to the spouse not seeking enforcement, OR (2) if it is not substantively fair, it was entered into with full financial disclosure, independent counsel, and voluntary execution. Both prongs are evaluated at the time of signing. The enforcing party bears the burden of proving validity — meaning the person who wants to rely on the prenup must prove it was fair or fairly made, not the other way around. That reversed burden makes Washington prenups meaningfully easier to challenge than in most states. Still, a prenup is far better than none in a community property state where the default is a 50/50 split.
2. What makes a prenup invalid in Washington?
Washington courts void prenups that fail both prongs of the fairness test. The most common failures are: presenting the agreement too close to the wedding without adequate time for attorney review (Matson — 4 days; Bernard — substantially different draft 3 days before); failure to disclose all assets, debts, and income; lack of independent counsel for each party; and significant wealth disparity combined with terms that leave the less wealthy spouse with little or nothing. Washington also requires that the parties actually observe the agreement's terms during the marriage — if spouses commingle assets or treat separate property as community, a court can decline to enforce the prenup at divorce. Including child custody or support provisions can undermine the entire agreement.
3. How much does a prenup cost in Washington?
Attorney-drafted from scratch: $1,500–$5,000+ per side, or $3,000–$10,000+ per couple. Seattle-area family law attorneys typically charge $350–$500/hour; attorneys outside King County charge $200–$350/hour. The smarter approach: start with a Washington-specific template, draft changes with an AI tool, then hire an attorney only to review and assist with signing — bringing the total to roughly $500–$1,000 per side. Each party needs their own attorney. One attorney cannot represent both sides, and failure to have independent counsel is a common basis for invalidation.
4. Do I need a lawyer for a prenup in Washington?
Technically no — Washington law requires only a writing signed by both parties. Practically, yes. Matson stated courts "strongly urge" independent counsel for both parties. Where the agreement is substantively unfair (fails prong one), the second prong requires voluntary execution "upon independent advice and with full knowledge of rights" — making counsel effectively mandatory when the agreement favors one party. Kellar upheld a prenup with a large wealth disparity partly because the less wealthy spouse had independent counsel. Both parties need separate attorneys. An attorney who represents both sides, or one side drafting for both, is a common path to invalidation (Matson voided a prenup where the wife used the husband's attorney).
5. What are the legal requirements for a prenuptial agreement in Washington?
Washington has no prenup statute, so the requirements come from case law. The core requirements are: (1) the agreement must be in writing, signed by both parties (RCW 19.36.010 — the statute of frauds); (2) both parties must make full financial disclosure of all assets, debts, and income — this cannot be waived; (3) both parties should have independent legal counsel; (4) both parties must have adequate time to review, negotiate, and understand the agreement; and (5) the terms must be fair, or if not fair, the process must have been procedurally sound. No witnesses or notarization are required by law, though notarization is standard practice. Child custody, child support, and provisions that violate public policy are not enforceable and should be excluded entirely.
6. How does Washington's community property law affect a prenup?
Washington is one of nine community property states. Without a prenup, all income earned and property acquired during the marriage is presumptively owned 50/50 by both spouses — regardless of who earned it, whose name it's in, or who paid for it. This includes salaries, bonuses, RSU vesting, business appreciation, and retirement contributions made during the marriage. A prenup can override this default by designating specific assets as separate property and specifying how income earned during the marriage will be treated. Without one, the community property presumption controls everything. This makes a prenup more important in Washington than in the 41 equitable distribution states, where courts already have discretion to divide property unevenly based on circumstances.
7. Can a prenup override community property rules in Washington?
Yes — that is the primary purpose of a prenup in a community property state. Washington courts have long recognized the right of spouses to contract between themselves regarding their property (Matson, Bernard). A prenup can designate premarital assets as separate, keep income earned during marriage separate, protect business interests from community claims, and specify how jointly held property is divided. However, the prenup must be actually observed during the marriage. If spouses commingle separate and community assets — for example, depositing separate funds into a joint account or using community income to pay a separate-property mortgage — the separate property character can be lost through transmutation, regardless of what the prenup says.
8. Can you waive spousal maintenance (alimony) in a Washington prenup?
Not completely. Complete advance waivers of spousal maintenance are generally unenforceable in Washington as against public policy. Courts review maintenance provisions at the time of enforcement and may override a waiver that would leave one spouse without adequate support — particularly after a long marriage or dramatic change in circumstances. You can include provisions that modify the type, amount, and duration of maintenance, or establish formulas tied to marriage length and income disparity. A sliding scale (e.g., longer marriage = higher maintenance) is far more likely to survive judicial scrutiny than a flat zero-dollar waiver. Structure maintenance terms thoughtfully — this is one of the areas where Washington courts exercise the most discretion.
9. How far in advance should you sign a prenup in Washington?
Sign 60+ days before the wedding. Give your partner at least two weeks to review the final draft with their own attorney. Washington has no statutory minimum, but courts treat timing as direct evidence of procedural fairness — Matson voided a prenup presented 4 days before the wedding; Bernard voided one where a substantially different draft arrived 3 days before the ceremony; Foran voided one delivered 2 days before the wedding trip. On the other hand, Kellar upheld a signing 5 days before the wedding where other procedural factors were strong (independent counsel, mediation, negotiated revisions). Best practice: contact an attorney 4–6 months before the wedding. Ideal: sign before the proposal so there is zero time pressure.
10. How does a prenup protect RSUs, stock options, and pre-IPO equity in Washington?
In Washington, equity compensation that vests during the marriage is presumptively community property — even if the grant was made before the marriage. This is especially relevant in Seattle's tech economy where RSUs and stock options often vest over 3–4 years, straddling the premarital and marital periods. A prenup can designate all equity compensation as the separate property of the earning spouse, specify a formula for allocating grants that straddle the marriage line (e.g., based on the ratio of premarital to marital service), or treat only the premarital portion as separate. Without a prenup, a court will apply Washington's community property default and likely award the non-earning spouse 50% of any equity that vested during the marriage. List all current grants, vesting schedules, and strike prices in the financial exhibits.
11. How do you get a prenuptial agreement in Washington?
Five steps. (1) Download a Washington-specific template built around the Matson/Bernard fairness test — not a generic form. (2) Read it in full and draft changes using an AI tool to save on attorney hours. (3) Each party hires their own family law attorney to review. (4) Both parties complete financial disclosure schedules listing all assets, debts, and income over $1,000. (5) Sign the agreement with both attorneys present, ideally 60+ days before the wedding. Washington requires only a signed writing — no notarization or witnesses are legally mandated, though notarization is standard. Store signed originals with each party's attorney and in a secure location. Create a digital backup.
12. Is a prenup worth it for a second marriage in Washington?
Yes — arguably more than for a first marriage. Second marriages frequently involve premarital assets that need protection (a house, retirement accounts, business interests), children from a prior relationship whose inheritance rights should be preserved, and existing spousal maintenance obligations that must be accounted for. Washington's community property default does not distinguish between first and second marriages — all income and acquisitions during the marriage are community property. A prenup can ring-fence assets intended for children from a prior relationship, prevent a new spouse from claiming against retirement accounts funded before the marriage, and coordinate with existing estate plans. Courts are generally more receptive to prenups in second marriages where both parties are experienced adults with established financial lives.
13. Can a prenup protect you from your spouse's debt in Washington?
Yes, with limits. A prenup can allocate responsibility for premarital debts and specify that debts incurred during the marriage by one spouse remain that spouse's separate obligation. This is especially important in Washington because community property rules can make both spouses liable for debts incurred during the marriage — even debts one spouse didn't know about. However, a prenup cannot override the rights of third-party creditors. If a creditor has a valid claim against community property, the prenup's internal allocation between spouses will not prevent the creditor from collecting. The prenup protects you between spouses — in a divorce, the court will follow the agreed allocation — but it does not bind banks, the IRS, or other creditors.
14. Can you get a postnuptial agreement in Washington instead of a prenup?
Yes. Under RCW 26.16.120, married spouses can enter agreements regarding the status and disposition of community property. A postnuptial agreement is subject to even stricter scrutiny than a prenup because the parties are already in a fiduciary relationship — courts require heightened good faith, full disclosure, and independent counsel. The same two-prong fairness test from Matson/Bernard applies. Postnups are commonly used when circumstances change after marriage (one spouse starts a business, receives a large inheritance, or the couple wants to restructure finances). They are also used when a couple married without a prenup and later realizes they need one. A postnup is better than no agreement, but a prenup signed before marriage with adequate lead time is easier to enforce.