In the United States, about 43% of first marriages end in divorce, yet only 15% of couples have prenuptial agreements, and even fewer have postnups. In Washington's community property state, this protection gap leaves countless couples vulnerable to complicated asset division if their marriage ends.
As Spokane family law attorneys with decades of experience helping Washington couples navigate complex financial agreements, we've seen firsthand how postnuptial agreements provide clarity and protection for both spouses. Our team at Hodgson Law Office works closely with clients to create legally binding documents tailored to your specific situation.
What Is a Postnuptial Agreement in Washington State?
A postnuptial agreement is a legally binding contract between spouses created after marriage. Unlike prenuptial agreements, which must be signed before the wedding day, postnuptial agreements allow already-married couples to establish clear terms of property division, debt allocation, and financial rights in case of divorce or death.

In Washington, postnuptial agreements help married couples:
- Clearly define separate and community property
- Protect business interests from potential division
- Preserve inheritance rights
- Establish spousal maintenance terms
- Allocate responsibility for existing debts
- Outline how assets will be divided in a divorce
Washington courts recognize postnuptial agreements as valid contracts when properly executed, though they generally scrutinize them more carefully than prenuptial agreements to ensure fairness and voluntary consent from both parties.
Why Consider a Postnuptial Agreement?
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Many Washington couples find compelling reasons to create postnuptial agreements even after years of marriage. Here are some common scenarios where postnuptial agreements provide valuable protection:
Starting a Business After Marriage
When one spouse launches a business using marital funds, that business often becomes community property under Washington's community property laws. A postnuptial agreement can protect the entrepreneur's ownership interest and establish clear boundaries between business and marital assets.
For example, suppose you've used community funds to start a small business in Spokane. In that case, a postnuptial agreement can clarify that while the initial investment came from community property, the company, including future growth, remains your property.
Receiving an Inheritance
While inheritances are typically considered separate property in Washington, they can become commingled with community property without proper documentation. A postnuptial agreement clarifies how inheritances will be handled, especially if you plan to use inherited assets to improve shared property or pay community debts.
Changes in Financial Circumstances
Significant financial changes — whether positive (career advancement, inheritance) or negative (accumulating debt) — may warrant revisiting how assets and liabilities are handled within your marriage. A postnuptial agreement allows couples to adapt to these changes while protecting both parties' interests.
Planning for Blended Families
For couples with children from previous relationships, postnuptial agreements can ensure that specific assets are preserved for those children while still providing for the current spouse.
Strengthening Your Marriage
Contrary to popular belief, creating a postnuptial agreement can actually strengthen marriage by promoting financial transparency and open communication about money management, issues that commonly lead to marital conflict.
Critical Elements of a Valid Postnuptial Agreement in Washington
For a postnuptial agreement to be enforceable in Washington courts, it must meet several key requirements:

Full Financial Disclosure
Both spouses must provide complete information about their assets, debts, income, and financial obligations. Withholding information can render the agreement unenforceable.
Voluntary Consent
Courts scrutinize postnuptial agreements to ensure neither spouse was pressured or coerced. The agreement must be entered into freely by both parties.
Separate Legal Representation
While not absolutely required, it's highly recommended that each spouse retain their own attorney to review the agreement. This helps demonstrate that both parties understood the terms and had independent legal advice.
Fairness Standard
Washington courts apply a two-part fairness test to postnuptial agreements:
- Procedural fairness: Was the agreement negotiated fairly, with full disclosure and without duress?
- Substantive fairness: Are the terms of the agreement reasonable and not unconscionable?
An agreement that's grossly one-sided or leaves one spouse destitute may be deemed unenforceable, even if technically all other requirements were met.
Enforceability and Potential Limitations
Washington courts generally recognize and enforce postnuptial agreements, provided they meet all legal requirements outlined in RCW 26.16.120 regarding agreements between spouses.
While prenuptial agreements often enjoy strong enforcement by judges because they're created before marital obligations exist, postnuptial agreements face additional challenges:
- Fiduciary Duty: Spouses already have established legal obligations to each other when creating a postnup.
- Presumption of Community Property: Under RCW 26.16.030, most assets acquired during marriage are presumed community property.
- Emotional Complexity: Creating a postnuptial agreement during marriage can sometimes create relationship tension if not approached thoughtfully.
Despite these potential challenges, a well-drafted postnuptial agreement with proper legal guidance offers valuable protection when created with complete transparency and fairness.
Postnuptial vs. Prenuptial Agreements: Key Differences
While both types of agreements serve similar purposes, there are important distinctions between prenuptial and postnuptial agreements in Washington State:
Washington courts typically apply greater scrutiny to postnuptial agreements because of the existing legal relationship between spouses. While prenuptial agreements are negotiated by independent parties who can freely choose not to marry if the terms aren't agreeable, postnuptial agreements are created within an existing legal relationship.
What Cannot Be Included in a Postnuptial Agreement?
While postnuptial agreements provide significant flexibility in financial matters, certain issues remain outside their scope:
- Child custody arrangements: Courts make custody determinations based on children's best interests at the time of divorce, not predetermined agreements.
- Child support obligations: Parents cannot contract away their legal obligation to support their children.
- Provisions that encourage divorce: Clauses that provide financial incentives for divorce may be invalidated.
- Personal matters: Non-financial provisions governing day-to-day marriage details are generally unenforceable.
It's important to focus your postnuptial agreement on financial matters and property rights rather than attempting to regulate personal aspects of marriage or child-related issues.
Creating an Enforceable Postnuptial Agreement in Washington

To maximize the likelihood that your postnuptial agreement will be upheld if challenged, follow these essential steps:
- Each spouse should retain separate legal counsel to ensure independent representation.
- Provide comprehensive financial disclosure, documenting all assets, debts, income, and financial obligations.
- Allow adequate time for review and consideration rather than rushing the process.
- Ensure the agreement is fair and reasonable for both parties.
- Execute the agreement properly with signatures, witnesses, and notarization as required.
- Revisit the agreement periodically to ensure it remains relevant as circumstances change.
Following these guidelines creates a strong foundation for an enforceable postnuptial agreement that will provide lasting protection.
Trust Our Experienced Counsel for Your Postnuptial Agreement
Creating a postnuptial agreement requires careful navigation of complex Washington family law. Don't risk invalidating your agreement with DIY templates or generic online forms. At Hodgson Law Office, we've helped Washington couples create enforceable agreements that stand up to legal scrutiny while protecting their financial futures.
Contact us today to schedule a free consultation. Let us help you secure your financial future with a professionally drafted postnuptial agreement.