A community property agreement in Washington state is a written, notarized contract between spouses or registered domestic partners that reclassifies their property as community property and passes everything to the surviving partner, outside of probate, when the first one dies. It’s authorized by RCW 26.16.120, which lets both partners agree on the status and disposition of their community property, including what they already own and whatever they acquire later.1Washington State Legislature. RCW 26.16.120 Agreements as to Status Most agreements go beyond the bare statute and convert all separate property into community property too, which is why the document is often one of the cheapest, simplest, and most powerful estate planning tools available in the state. It’s also the wrong document for some couples, and the consequences of signing the wrong one show up only after someone has died.
What the Agreement Actually Does
Most Washington community property agreements are built on three provisions, each handling a different slice of the couple’s property.
The first converts existing separate property into community property. Without an agreement, assets you owned before the marriage, inheritances you received individually, and gifts made specifically to you stay yours alone. The first provision erases that line. A house one spouse bought years before the wedding, a brokerage account funded entirely by one partner’s inheritance — all of it becomes jointly owned community property the moment both partners sign.
The second provision applies the same treatment to anything acquired later. Future inheritances, gifts, and investment gains come in as community property automatically. That matters because couples routinely mix separate and community funds in shared accounts over decades, and tracing which dollars belong to whom becomes nearly impossible. This provision makes the tracing exercise unnecessary.
The third provision is the one most couples sign the document for. When one spouse dies, all community property passes immediately to the survivor by operation of the contract itself. No probate, no will required for those assets, no court involvement. For couples with straightforward estates who want everything to go to each other, this single provision can replace the need for a will or a trust for the first death.
What Happens When One Spouse Dies
The transfer is automatic in the legal sense, but the surviving spouse still has paperwork to handle. For real estate, the survivor typically records a copy of the death certificate along with the agreement (if it wasn’t already recorded) with the county auditor in every county where the couple owned property, plus a community property affidavit to clear title. Financial accounts, brokerage holdings, and other titled assets each require their own affidavit sent to the institution holding the asset. None of this requires a court proceeding, but title doesn’t update itself.
One limit catches people off guard: the agreement only governs the transfer from the first spouse to die to the survivor. It says nothing about what happens when the survivor eventually dies. If that spouse hasn’t done their own planning — a will, a trust, or a new agreement with a later partner — their estate passes under Washington’s intestacy laws or whatever documents they do have. A community property agreement is half a plan.
The Tax Benefit Most Couples Sign For
Federal tax law gives community property a treatment that common-law property doesn’t get. Under 26 U.S.C. § 1014(b)(6), when property is held as community property and at least half of the community interest is included in the decedent’s gross estate, both halves receive a stepped-up basis to fair market value at the date of death.2Office of the Law Revision Counsel. 26 USC 1014 Basis of Property Acquired From a Decedent Practitioners call this the double step-up.
The numbers make the point. A couple buys a home together for $300,000, and it’s worth $800,000 when one spouse dies. In a common-law state where the home is held as joint tenants, only the decedent’s half steps up. The survivor’s half keeps its original $150,000 basis, and if they sell, they’re looking at $350,000 of gain on their half before the $250,000 exclusion. With community property treatment, both halves step up to $800,000, wiping out the entire $500,000 of built-in gain. A sale shortly after produces little or no taxable gain.
An agreement that converts all assets to community property extends this treatment to the widest possible base — pre-marriage investments, inherited stock that has appreciated for decades, anything that was separate property before signing.
When a Community Property Agreement Is the Wrong Choice
Blended Families
This is the biggest hazard. Because the agreement converts everything to community property and sends it all to the surviving spouse, children from a prior marriage can be shut out entirely. A wife enters the marriage with a $500,000 inherited investment account. She signs an agreement. The account becomes community property, and when she dies it goes to her husband. He has no legal obligation to pass any of it to her children. If preserving assets for children from a prior relationship matters to you, this is the wrong tool. A trust gives you much more control.
Spouses With Debt or Lawsuit Exposure
Separate property in Washington generally isn’t reachable by the other spouse’s creditors. Community property is. Converting your separate assets into community property makes them vulnerable to your spouse’s business debts, judgment creditors, or unpaid taxes. The statute itself preserves creditor rights explicitly, so an agreement cannot be used to shield assets from legitimate debts.1Washington State Legislature. RCW 26.16.120 Agreements as to Status
Couples Approaching Long-Term Care
Converting separate property to community property can have serious consequences for Medicaid eligibility if one spouse later needs long-term care. In Washington, community property is generally counted as an available resource when deciding whether an institutionalized spouse qualifies. Property that would have stayed separate — and potentially outside the Medicaid resource calculation — becomes part of the countable community estate the moment the agreement takes effect. Elder law attorneys often use separate property agreements to protect assets heading into long-term care. A community property agreement moves in the opposite direction.
Irrevocable After the First Death
While both partners are alive, the agreement can be changed or revoked by mutual consent. The moment one spouse dies, the agreement is fulfilled and the property transfers. The survivor cannot undo it. If the marriage had quietly deteriorated or the couple had informally separated without revoking the document, the survivor still receives everything. The deceased spouse’s estate has no claw-back absent proof of fraud or another equitable ground a court would accept — the statute does allow a superior court to set the agreement aside for fraud at the request of either party.1Washington State Legislature. RCW 26.16.120 Agreements as to Status
How It Interacts With a Will or Trust
The agreement operates outside probate, which means it controls property disposition regardless of what a will says. If your will leaves a family cabin to your sister but your community property agreement converts everything to community property that passes to your spouse, the agreement wins for that asset. The will governs only property the agreement doesn’t cover. Failing to coordinate the two documents is a common and avoidable mistake.
Compared with a revocable living trust, a community property agreement is simpler and cheaper but far less flexible. A trust lets you set conditions, provide for children from earlier relationships, stagger inheritances, or fund a special-needs trust. The agreement does one thing: it sends everything to the surviving spouse. For a first marriage with no desire to divide assets among different beneficiaries, that simplicity is the point. For blended families, it isn’t.
Registered domestic partners have the same rights as married spouses under Washington law and can sign these agreements on identical terms.3Washington State Legislature. RCW 26.60.015 Intent
Signing, Recording, and Changing the Agreement
Washington treats the formalities seriously. The statute requires the agreement to be executed in the same manner as a deed to real estate, which under RCW 64.04.020 means a written document, signed by both parties, and acknowledged before an authorized person.4Washington State Legislature. RCW 64.04.020 Requisites of a Deed In practice, both partners sign in front of a notary who acknowledges the signatures. A document merely signed at the kitchen table without notarization won’t hold up, and the defect usually surfaces when the survivor tries to clear title. That is the worst possible time to find out.
Before signing, gather the full legal names of both partners as they appear on government ID, an inventory of the separate property each person is bringing into the community estate, and the legal descriptions for any real estate. Legal descriptions come from recorded deeds and are not the same as street addresses.
Record the signed agreement with the county auditor where you live, and in any other Washington county where you own real estate. Recording isn’t strictly required for the agreement to bind the two spouses, but an unrecorded document creates serious problems for later real estate transactions because buyers, lenders, and title companies have no public notice of the property’s changed status.
To change the agreement, both partners must sign a new document with the same formalities — written, signed, notarized. One spouse cannot unilaterally alter or revoke it.1Washington State Legislature. RCW 26.16.120 Agreements as to Status To fully unwind the agreement, execute a formal revocation and record it in every county where the original was recorded. Leaving an old agreement sitting on the public record while operating as though it’s been revoked invites title disputes down the road.
One final warning. The statute does not clearly say whether a divorce automatically terminates the agreement. Some commentators have argued that permanent separation or dissolution should imply termination, but relying on that assumption is risky. If you are going through a divorce or legal separation with an agreement in place, address it directly in the dissolution proceedings. Don’t assume it disappears on its own.