A prenuptial agreement is a contract two people sign before marriage that decides how property, debt, and money will be handled if the marriage ends or one spouse dies. In Washington, this kind of agreement carries extra weight because the state treats most marital property as jointly owned.
Not legal advice. This article is general information only. Prenup laws differ by state and change over time. Consult a licensed attorney in your state before acting on anything here.
Washington never adopted the Uniform Premarital Agreement Act, the model law many other states follow. Instead, the rules for prenups come from court decisions, and judges review these contracts closely.
This guide explains how Washington courts decide whether a prenup holds up, what the agreement can and cannot cover, and what it usually costs.
Are Prenuptial Agreements Enforceable in Washington?
Contents
- Are Prenuptial Agreements Enforceable in Washington?
- Washington Is a Community Property State
- What You Can Include in a Washington Prenup
- What a Washington Prenup Cannot Do
- Execution Rules for a Washington Prenup
- Spousal Maintenance in a Washington Prenup
- Full Financial Disclosure
- Common Reasons Washington Prenups Fail
- How Much Does a Prenup Cost in Washington?
- Creating a Washington Prenup: Step by Step
- Washington Prenups: Key Takeaways
- More Prenup Resources
Yes. Washington courts enforce prenuptial agreements, but they apply a strict review developed through case law rather than a statute. The leading decisions are Friedlander v. Friedlander (1972) and In re Marriage of Matson (1987).
These cases set up a two-part test that every Washington prenup must satisfy. The test looks at both the substance of the deal and the way it was signed.
The Two-Prong Fairness Test
The first prong asks whether the agreement is substantively fair, meaning it makes a fair and reasonable provision for the spouse who is not asking the court to enforce it. If the agreement passes this prong and there is no fraud or overreaching, the analysis ends and the contract stands.
If the agreement is not substantively fair, the court moves to the second prong. There it asks two things: did both parties fully disclose the amount, character, and value of their property, and did each person sign voluntarily, with independent advice and full knowledge of the rights being given up.
An agreement that fails the first prong can still survive if it clears the second. A one-sided contract is not automatically void, but it must have been signed with honest disclosure and real understanding.
Who Bears the Burden of Proof
In Washington, the spouse trying to enforce the prenup carries the burden. That person must show the agreement was fair or, failing that, that disclosure was complete and the signing was voluntary and informed.
This burden matters in practice. In Matson, the agreement was drafted the night before the wedding, and the court refused to enforce it because the spouse had no real chance to seek counsel.
Washington Is a Community Property State
Washington is one of a small group of community property states. Under RCW 26.16.030, income earned and most assets acquired during the marriage are owned equally by both spouses, no matter whose name is on the paycheck or the account.
This default applies even if one spouse earns far more than the other. At divorce or death, that community property is generally split between the two parties.
A prenuptial agreement is the main way a couple can opt out of this default. With a valid prenup, partners can keep certain income and assets separate, define what counts as community property, and set their own rules for division.
What You Can Include in a Washington Prenup
A prenup gives couples room to plan how their finances will work during marriage and how property will be handled if it ends. The table below shows common provisions.
| Area | What the agreement can do |
|---|---|
| Separate property | Confirm that assets owned before marriage stay separate |
| Community property | Define what becomes shared and what stays individual |
| Income during marriage | Keep earnings separate instead of community |
| Debt | Assign responsibility for premarital and marital debt |
| Business interests | Protect a company from being divided or claimed |
| Spousal maintenance | Limit or waive support, within legal limits |
| Estate and inheritance | Coordinate with wills and protect assets for children |
What a Washington Prenup Cannot Do
Some terms fall outside what a prenup can decide. Courts will ignore or strike provisions that cross these lines.
- Set or limit child support, which belongs to the child and is decided by the court
- Predetermine child custody or parenting arrangements
- Include anything illegal or that encourages divorce
- Waive maintenance in a way that leaves a spouse destitute or on public assistance
- Control non-financial personal matters, such as chores or appearance
Execution Rules for a Washington Prenup
Washington does not provide a single statute listing signing formalities, so courts look to general contract rules and the fairness test. Following accepted practice protects the agreement from later challenge.
Writing and Signatures
The agreement must be in writing and signed by both parties. An oral promise about property will not be enforced.
Notarization and Witnesses
Notarization is strongly recommended and is standard practice for Washington prenups. Many couples also sign in front of two witnesses to add proof that each party signed freely.
Timing Before the Wedding
Signing well before the wedding is one of the best ways to avoid a coercion claim. Many Washington attorneys treat signing at least 30 days before the ceremony as the safe standard, since a last-minute signature suggests pressure.
Spousal Maintenance in a Washington Prenup
A couple can limit or waive spousal maintenance, also called alimony, in a Washington prenup. The waiver must be in writing, signed by both parties, and made knowingly and without duress.
Courts are protective of maintenance rights. A judge may refuse to enforce a complete waiver if it would leave one spouse destitute or dependent on state assistance after a long marriage.
Each party should ideally have separate counsel explain the waiver, and the agreement should list both parties’ assets, debts, and income.
Full Financial Disclosure
Honest disclosure is at the center of Washington’s review. The Friedlander decision held that engaged partners do not deal at arm’s length; their relationship calls for good faith and candor in all matters bearing on the agreement.
Each person should disclose the amount, character, and value of their assets, debts, and income. Attaching a written schedule of finances to the agreement is the clearest way to prove this.
Hiding or understating assets is one of the fastest ways to have a prenup thrown out.
Common Reasons Washington Prenups Fail
Most challenges target the two-prong test. These are the patterns that lead judges to refuse enforcement.
- Signing the night before or days before the wedding, suggesting pressure
- Incomplete or false financial disclosure
- One party had no chance to consult an attorney
- Terms so lopsided they leave one spouse with almost nothing
- Signs of coercion, threats, or duress
- A maintenance waiver that would leave a spouse destitute
How Much Does a Prenup Cost in Washington?
Cost depends on how complex your finances are and whether you use attorneys or an online platform. The table below shows common ranges.
| Option | Typical cost |
|---|---|
| Simple agreement, attorney drafted | $1,500 to $5,000 per couple |
| Complex assets, each party with counsel | $2,000 to $7,000 per person |
| Online platform, flat fee | A few hundred dollars |
Online services such as HelloPrenup let couples draft an agreement at a flat rate, which can work for straightforward situations. For high net worth, business ownership, or blended families, separate attorneys are the safer route, partly because independent counsel supports the second prong of the fairness test.
Creating a Washington Prenup: Step by Step
A clear process helps the agreement hold up later. These steps follow the standard order.
- Start the conversation early, well before the wedding
- Each partner lists all assets, debts, and income
- Agree on what stays separate and what becomes community property
- Draft the agreement through an attorney or an online platform
- Have each party review it with independent counsel where possible
- Sign and notarize the final version, ideally at least 30 days before the wedding
- Store signed copies safely with your other estate documents
Washington Prenups: Key Takeaways
Because Washington is a community property state and reviews prenups through case law, the details of how you sign matter as much as what you sign. Full disclosure, independent advice, and signing with time to spare are what keep an agreement enforceable.
A prenup is not only for the wealthy. It is a practical tool for any couple who wants to decide their own financial rules instead of relying on the state’s default split.
Sources
- Friedlander v. Friedlander, 80 Wn.2d 293 (1972), Washington Supreme Court
- In re Marriage of Matson, 107 Wn.2d 479 (1987), Washington Supreme Court: law.justia.com
- RCW 26.16.030, community property: app.leg.wa.gov
- In re Marriage of Bernard, 165 Wn.2d 895 (2009), Washington Supreme Court