A community property agreement is a written contract between spouses that reclassifies how they own their assets and debts, usually by converting one or both spouses’ separate property into jointly owned community property. Couples use it mainly for estate planning: with a survivorship clause, everything passes to the surviving spouse at death without probate, and the surviving spouse gets a full stepped-up tax basis on the entire property instead of just half. Those benefits come with real tradeoffs, including greater exposure to a spouse’s creditors and the loss of separate-property protection if the marriage ends in divorce.
Where Community Property Agreements Are Available
Nine states treat assets acquired during marriage as community property by default: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin.1Internal Revenue Service. Publication 555 (12/2024), Community Property In these states, income earned and debts taken on during marriage generally belong equally to both spouses regardless of whose name is on the account.
Three additional states let couples opt in. Alaska, South Dakota, and Tennessee each offer a mechanism for married couples to elect community property treatment for some or all of their assets. The IRS has flagged that its Publication 555 does not address the federal tax treatment of property subject to those elections, so couples in opt-in states should confirm the tax consequences with a professional before signing anything.1Internal Revenue Service. Publication 555 (12/2024), Community Property
If you live in a common-law property state that is not on either list, a community property agreement is not a tool available to you. Your estate planning options are different ones.
What the Agreement Can Reclassify
A community property agreement can address almost anything the spouses own. Real estate, bank accounts, investment accounts, retirement savings, vehicles, and personal belongings can all be converted. The most common use is turning one spouse’s separate property into community property. Separate property generally means anything owned before the marriage or received individually as a gift or inheritance.
Agreements can also run in the other direction, designating what would otherwise be community property as one spouse’s separate property. That flexibility is why these documents work as targeted estate planning tools rather than fixed forms.
Debts can be addressed too. Mortgages, auto loans, and credit card balances taken on during the marriage are usually community debts already, but an agreement can clarify responsibility for debts one spouse brought into the marriage or for obligations that might otherwise be disputed.
How It Differs From a Prenup or Postnup
All three are written contracts between spouses that deal with property rights, which is why they get confused. The differences come down to timing and purpose.
- A prenuptial agreement is signed before marriage and typically focuses on protecting each spouse’s assets if the marriage ends in divorce.
- A postnuptial agreement is signed during the marriage and serves a similar protective function, often prompted by a change in circumstances such as a business becoming more valuable.
- A community property agreement is signed during the marriage and focuses on what happens when a spouse dies, not when the marriage ends. Its primary purpose is estate planning: consolidating ownership so property passes smoothly to the survivor.
Some states treat all three as variations of a single legal concept; others draw sharp lines. The practical point is that a community property agreement is not a substitute for a prenup if your concern is protecting assets in a divorce. Its strength lies in what happens after death.
Avoiding Probate on the First Death
When a community property agreement includes a survivorship clause, all community property passes directly to the surviving spouse at the moment of death. There is no probate, no court-supervised distribution, no executor managing the transfer. The surviving spouse presents the agreement and a death certificate to financial institutions and the county recorder.
Without an agreement, even in a community property state, the deceased spouse’s half of the community property may need to go through probate before reaching the survivor, depending on how assets are titled and what the will says. Probate takes months and costs money in court fees and attorney time.
There is a tradeoff built into the survivorship clause. The first spouse to die cannot leave their half of the community property to anyone else. If one spouse wants certain assets to go to children from a prior marriage, a sibling, or a charity, those assets should stay outside the agreement or be handled through a separate estate plan.
The Double Stepped-Up Basis
This is the tax benefit that drives most of the interest in these agreements. Under federal tax law, when someone dies, the basis of their property resets to its fair market value on the date of death.2Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent For most inherited property, only the deceased person’s share gets this reset. Community property is treated differently.
Section 1014(b)(6) of the Internal Revenue Code provides that when one spouse dies, both halves of community property receive the stepped-up basis, including the surviving spouse’s half.2Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent Consider a couple that bought a home decades ago for $200,000 and sees it appraised at $800,000 when one spouse dies. In a common-law property state, only the deceased spouse’s half steps up, leaving the survivor with a basis of $500,000. Selling the home triggers capital gains tax on $300,000 of appreciation.
With community property, both halves step up to $800,000. The surviving spouse can sell the next day and owe no capital gains tax. On significantly appreciated real estate or long-held investment portfolios, the savings can run into tens or hundreds of thousands of dollars. This is the main reason couples in opt-in states like Alaska bother creating these agreements at all.
The Risks
These benefits come at a cost that often gets glossed over.
Exposure to Your Spouse’s Creditors
In most community property states, creditors can reach community property to satisfy debts incurred by either spouse, regardless of how the property is titled or which spouse ran up the debt.3Internal Revenue Service. Internal Revenue Manual 25.18.1 – Basic Principles of Community Property Law A creditor generally cannot pursue one spouse’s separate property to collect on the other spouse’s debts.4Justia. Marriage and Debt Under the Law The moment you convert separate property into community property, that protection goes away. If your spouse has significant debts or works in a high-liability profession, reclassifying an inheritance or premarital savings puts those assets within reach of their creditors.
Loss of Separate Property in Divorce
An agreement designed for estate planning can backfire if the marriage ends. Property that was yours alone becomes community property subject to equal division. Unwinding the agreement during a contentious divorce is possible in some states but far from guaranteed, and the legal fight gets expensive.
Medicaid and Long-Term Care
Medicaid eligibility for long-term care depends on how much a couple owns in countable assets. Converting separate property into community property enlarges the pool of jointly owned assets, which can push a couple over the applicable asset limits. Couples near the age where nursing home coverage becomes a realistic concern should talk to an elder law attorney before signing.
Hard to Unwind in Practice
An agreement can be modified or revoked, but once separate property has been commingled with community funds, tracing it back to its original character is expensive and sometimes impossible.3Internal Revenue Service. Internal Revenue Manual 25.18.1 – Basic Principles of Community Property Law A signed revocation does not reconstruct the separate property that existed beforehand.
What Makes the Agreement Valid
Nearly every community property state requires these agreements to be in writing and signed by both spouses.3Internal Revenue Service. Internal Revenue Manual 25.18.1 – Basic Principles of Community Property Law A few states have historically recognized oral agreements, but those claims face heavy scrutiny. Treat a written document as mandatory.
Most jurisdictions also require notarization, and some require the agreement to be recorded with the county to be valid against creditors or other third parties.3Internal Revenue Service. Internal Revenue Manual 25.18.1 – Basic Principles of Community Property Law The language has to be specific about which property is being reclassified and how. Vague or boilerplate drafting is the most common reason these agreements get challenged.
Both spouses need to understand what they are signing. A court may refuse to enforce an agreement if one spouse was pressured, denied the chance to consult an attorney, or kept in the dark about the consequences. At least one opt-in state requires a capital-letter warning at the top of the agreement cautioning that the effects on creditor rights and divorce may be extensive.
Changing or Ending the Agreement
Both spouses must agree to any change. A community property agreement is a contract, so one spouse cannot modify or revoke it alone. Changes generally need to follow the same formalities as the original: a new written document, signed by both spouses, and usually notarized.
Divorce or legal separation terminates the community property estate itself. In most community property states, the estate ends only when a final divorce or separation decree is entered, which means filing or moving out does not change anything on its own. A couple of states end the community estate when spouses physically separate with a mutual intent to end the marriage permanently.3Internal Revenue Service. Internal Revenue Manual 25.18.1 – Basic Principles of Community Property Law The agreement becomes moot once the underlying community property system no longer applies, but property already reclassified does not automatically revert. How it gets divided is up to the divorce settlement or court order.
The calculation for most couples comes down to a straightforward weighing: probate avoidance and the double stepped-up basis on one side, creditor exposure and loss of separate property protection on the other. For couples with similar assets and no significant creditor concerns, the agreement is often an easy call. For couples where one spouse has substantially more separate wealth, or where one spouse carries significant debt or liability risk, the risks deserve a careful look with an estate planning attorney before anything gets signed.