How to Fill Out a Washington State Prenuptial Agreement Form

A Washington state prenuptial agreement form is not issued by any state agency, so filling one out means starting with a template from a legal document service or law library, attaching full financial disclosure schedules, drafting the property and maintenance terms you want, and signing before witnesses and a notary well before the wedding. The agreement’s legal footing comes from RCW 26.16.120, which lets spouses and future spouses agree in writing on the status and disposition of community property, together with the enforceability test the Washington Supreme Court set out in In re Marriage of Matson.¹ Because Washington is a community property state, the form is the main tool for keeping specific assets or debts out of the marital estate.

Decide What the Agreement Will and Won’t Cover

Before you put anything on paper, know the boundaries. A Washington prenup can address ownership and division of assets owned before or acquired during the marriage, responsibility for each person’s debts, treatment of income and earnings after the wedding, valuation and treatment of a privately held business, how appreciation on pre-marital investments or retirement accounts will be categorized, and whether spousal maintenance will be paid if the marriage ends.

Some things do not belong in the form. Child custody and child support cannot be locked in by contract. Courts decide those based on the child’s best interests at the time of divorce or separation, and any clause attempting to fix them will be ignored.

ERISA-governed retirement plans are the other hard limit. You cannot waive survivor benefits in a 401(k), pension, or other ERISA-qualified plan through a prenup, because federal law requires the waiver to come from a “spouse,” and you are not yet married when the document is signed.² If waiving survivor benefits matters, handle it in a postnuptial agreement after the wedding that satisfies 29 U.S.C. § 1055, with written spousal consent witnessed by a plan representative or notary and designating an alternate beneficiary. Monthly pension benefit rights, as opposed to survivor benefits, can still be addressed in the prenup.

Gather Your Financial Disclosures

Full and fair disclosure is the single biggest factor in whether a court will later enforce the agreement. The Washington Supreme Court has held that validity requires “full disclosure by both parties of all aspects of each party’s assets, with the agreement entered into fully and voluntarily on independent advice and with full knowledge by each spouse of the individual rights of each party.”³ Incomplete disclosure is one of the fastest ways to get a prenup thrown out.

Sort what you own into two categories. Separate property under Washington law includes anything you owned before the marriage and anything you later receive as a gift or inheritance, along with the income those assets generate.⁴ Community property is everything else either spouse acquires after the wedding.⁵ The whole point of the agreement is usually to override these default rules for specific assets, so the sorting has to be accurate.

Each party should pull current documentation for every major asset and liability:

Recent bank and brokerage statements showing checking, savings, and investment balances.
Current statements for 401(k), IRA, and pension accounts.
Recent appraisals or comparative market analyses for real estate.
A professional valuation, or at minimum financial statements, for any privately held business.
Current fair market values for vehicles.
Balances for student loans, credit cards, mortgages, and any other outstanding debts.
Life insurance face values and cash surrender values.
Tax returns from the past two years.

Appreciation on separate property is where couples often trip up. If you own a rental building before the marriage and it doubles in value because of the market alone, that growth generally stays separate. If community effort or community funds help drive the increase, through years of renovation and management by both spouses, a court can treat part of that appreciation as community property. A well-drafted agreement says directly how appreciation on each pre-marital asset will be categorized.

Fill In the Body of the Form

Washington does not publish an official prenuptial agreement form. Most couples start with a template from an online legal document service or a local law library and customize it. The opening section typically includes the full legal names of both parties, the date of signing, and the intended wedding date, along with a clear statement that both parties are entering the agreement voluntarily and have had the chance to consult independent legal counsel.

The financial information from the disclosure phase goes into schedules attached to the agreement, usually labeled Schedule A for one party’s assets and debts and Schedule B for the other’s. Each item should appear with a description and a current value. A court looking at enforceability will examine these schedules to decide whether disclosure was adequate, so list too much rather than too little.

The body of the form then sets out how property will be treated going forward. Common clauses cover:

A statement that assets listed on each schedule remain the separate property of the person who brought them in.
Whether salary and bonuses earned during the marriage will stay community property, which is the default, or be treated partly as separate property.
Confirmation that future inheritances and gifts remain separate. RCW 26.16.010 already provides this, but restating it adds clarity.⁴
Who is responsible for pre-existing debts and how debts incurred during the marriage are allocated.
Whether spousal maintenance will be paid, and if so, how much and for how long.
What percentage of community property each spouse receives if the marriage ends.

Sunset Clauses

Some couples add a sunset clause that terminates the agreement after a set number of years, often ten, timed to a wedding anniversary. These appeal to couples where one person is reluctant to sign at all, or where both want the agreement to apply only during the early years before their finances fully merge. If you include one, make the expiration date unambiguous and spell out what happens to property that was classified under the agreement up to that point.

Clauses to Leave Out

Omit anything addressing child custody or child support, since courts will disregard those terms. Lifestyle or infidelity penalty clauses are not explicitly barred by Washington statute, but they invite enforceability challenges and can make a court skeptical of the whole document. Any attempt to waive ERISA survivor benefits also stays out of the prenup and goes into a later postnuptial agreement.²

Sign, Witness, and Notarize

RCW 26.16.120 requires the agreement to be executed “in writing under their hands and seals” and to be “witnessed, acknowledged and certified in the same manner as deeds to real estate.”¹ In practice, both parties sign, witnesses observe the signing, and a notary public acknowledges the signatures under the procedures in RCW 64.08.050.⁶ Each signer must present valid government-issued photo ID so the notary can verify identity. The notary then completes a certificate stating that the signers appeared voluntarily and were identified, applies an official seal, and signs.

Timing is part of enforceability. Sign weeks or months before the wedding, not the night before. A court will look at “timing of the agreement juxtaposed with the wedding date” as one factor in deciding whether either party felt pressured.³ Last-minute signing is exactly the circumstance that gives a judge reason to invalidate the agreement.

What Makes a Washington Prenup Hold Up

Because Washington has no standalone prenup statute, courts apply the two-part test from In re Marriage of Matson. Knowing it helps you fill out the form in a way that will actually survive challenge.

First, the court asks whether the agreement provides a “fair and reasonable provision” for the party now challenging it. If yes, the analysis stops and the agreement is enforced.³ An agreement that leaves one spouse with almost nothing while the other keeps millions is the kind of deal that fails here.

Second, if the agreement is not substantively fair, the court checks whether both parties made full disclosure of the amount, character, and value of their property, and whether the agreement was entered into “fully and voluntarily on independent advice and with full knowledge by both spouses of their rights.”³ The court looks at the bargaining positions of both parties, their sophistication, whether each had independent counsel, their understanding of what they were giving up, and when the agreement was signed relative to the wedding. The court has also stressed that engaged parties do not deal at arm’s length and owe each other a high standard of candor.

Independent legal counsel is not technically required, but its absence makes the agreement much more vulnerable. If both parties had their own attorneys, a court is far less likely to find that one spouse didn’t understand the terms. Attorney review typically runs from several hundred to a few thousand dollars per person, depending on complexity.

Changing or Canceling the Agreement Later

RCW 26.16.120 allows the agreement to be “altered or amended in the same manner” as it was originally executed.¹ Any amendment must be in writing, signed by both parties, witnessed, and notarized. A verbal change or a handshake deal to ignore the prenup will not hold up. If both spouses want to revoke the agreement entirely, they execute a written revocation with the same formalities and keep it with the original so there is no confusion about which version controls. Couples whose circumstances change in meaningful ways, through a large inheritance, a career change, or the birth of children, often revisit the document every few years.

Where to Keep the Signed Document

After signing and notarization, produce multiple originals with wet-ink signatures and the notary’s seal. Each spouse should keep an original in a fireproof safe or a bank safe deposit box. If either party has an attorney, give the firm a copy for its permanent files so a verified version exists even if personal copies disappear. Washington does not require you to record a prenup with the county, and most couples prefer not to, since recording makes the agreement a public record.

1
Washington State Legislature. RCW 26.16.120
2
Office of the Law Revision Counsel. 29 USC 1055 – Requirement of Joint and Survivor Annuity and Preretirement Survivor Annuity
3
Justia Law. In Re Marriage of Matson
4
Washington State Legislature. RCW 26.16.010 – Separate Property of Spouse
5
Washington State Legislature. RCW 26.16.030 – Community Property Defined – Management and Control
6
Washington State Legislature. RCW 64.08.050