Which states are community property states?

The IRS lists nine: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin (IRS Publication 555). Wisconsin's statutes use the term "marital property" rather than "community property" for the same basic concept, and Louisiana calls the process after a death a "succession" rather than probate, but all nine share the core rule that property acquired during the marriage is owned by both spouses. What governs is domicile, not where the property sits: Publication 555 states that "[g]enerally, the laws of the state in which you are domiciled govern whether you have community property and community income or separate property and separate income for federal tax purposes." A few separate-property states also have statutes letting married couples elect community-property treatment for assets held in a specially drafted trust, which is worth checking for if the estate planning file contains something unexpected.

Does the whole house go through probate if only my spouse died?

Usually not, but "usually not" depends on how the deed reads and on your state's procedure. The characterization rule and the probate rule are two different things. Community property means the surviving spouse already owns an undivided one-half interest -- Wisconsin's statute puts it as plainly as any: "Each spouse has a present undivided one-half interest in each item of marital property" (Wis. Stat. § 766.31(3)). Only the deceased spouse's half is theirs to pass, so only that half is in play. Whether that half needs a court proceeding, and whether a spousal shortcut applies, is set by state procedure -- California, for example, provides that property passing to a surviving spouse passes "and no administration is necessary" in defined circumstances (Cal. Prob. Code § 13500), subject to other chapters of that code. The deed language still matters for the paperwork, which our guide to transferring a deed to a surviving spouse covers in detail.

What is the "double step-up" in basis and why does it matter?

It is the single largest financial consequence of community property for most surviving spouses, and it concerns capital gains tax rather than probate. Normally only a deceased person's share of an asset gets its tax basis reset to fair market value at death. For community property, federal law treats the survivor's own half as having passed from the decedent for basis purposes: 26 U.S.C. § 1014(b)(6) covers "[p]roperty representing the surviving spouse's one-half share of community property held by the decedent and the surviving spouse under the community property laws of any State." IRS Publication 555 states the practical result: "If you own community property and your spouse dies, the total fair market value (FMV) of the community property, including the part that belongs to you, generally becomes the basis of the entire property," provided "at least half the value of the community property interest must be includible in your spouse's gross estate." Its own example: property with a basis of $80,000 and an FMV of $100,000 at death produces a $50,000 basis for the survivor's half and $50,000 for the heirs' half. Whether a specific asset qualifies is a question for a tax professional, because the answer turns on how that asset is characterized.

We moved from California to a separate-property state. Which rules apply?

This is the most common and most consequential mess in this area, and it generally cannot be answered from a flowchart. Community property character attaches when property is acquired while the couple is domiciled in a community property state, and the character does not automatically change because the couple later moves. Some states address the mirror-image situation with a concept called quasi-community property -- California, for instance, defines it to include personal property wherever situated and real property in California that a decedent acquired while domiciled elsewhere, which would have been community property had they been domiciled in California at the time (Cal. Prob. Code § 66). The practical upshot for an executor is that a single estate can contain genuinely community assets, genuinely separate assets, and assets whose character depends on where the couple lived in a particular year. Where the couple moved across that line, this is the point in the estate to get a lawyer's read rather than a guess.

Does community property override a beneficiary designation on a 401(k) or life insurance policy?

Not by itself, and this is where people most often assume wrongly. An account with a valid beneficiary designation generally pays to that beneficiary without passing through probate, and that mechanism sits alongside the community property rules rather than underneath them. Federal pension law adds its own layer in the other direction: ERISA generally requires that a married participant's benefit be paid as a qualified joint and survivor annuity, and a waiver of that is ineffective unless "the spouse of the participant consents in writing to such election" and the consent "is witnessed by a plan representative or a notary public" (29 U.S.C. § 1055(c)(2)). IRAs are not governed by that ERISA provision, which is why an IRA naming someone other than the spouse behaves differently from a 401(k) doing the same thing. Flag any designation that does not name the surviving spouse rather than assuming either that it controls absolutely or that community property quietly overrides it.

Am I responsible for my spouse's debts in a community property state?

This is the question where generic answers do the most damage, because the rules are genuinely state-specific and turn on when the debt was incurred and for whose benefit. What is safe to say is the shape of it: whether a debt is treated as a community obligation, what property is available to satisfy it, and what a surviving spouse's exposure is, are separate questions answered by your state's statutes rather than by a single national rule. Washington's community property agreement statute illustrates the general principle that these arrangements are not a creditor-avoidance tool -- the statute preserves creditors' rights notwithstanding such an agreement (RCW 26.16.120). Do not pay a creditor out of your own funds to make calls stop, and do not assume you are clear either. Get the debts inventoried with dates, then get a local read on them.

Community Property: The Surviving Spouse's Share

The Part Everyone Gets Backwards

When a spouse dies in a community property state, the first instinct is to ask what the surviving spouse inherits. That is the wrong first question, and asking it is what sends people down the wrong path for weeks.

In a community property state, a meaningful share of the estate is not inherited at all, because the surviving spouse already owns it. Wisconsin's statute states the concept about as cleanly as any state does: "All property of spouses is marital property except that which is classified otherwise by this chapter," "[a]ll property of spouses is presumed to be marital property," and "[e]ach spouse has a present undivided one-half interest in each item of marital property" (Wis. Stat. § 766.31).

A present interest. Not a claim, not an expectancy, not something that arrives at death. The survivor's half was already theirs the day before.

So the right first question is a characterization question: of everything the couple owned, which part was the deceased spouse's to pass? Answer that and the rest of the estate -- what needs a court, what the tax basis becomes, what the inventory looks like -- follows from it. Get it wrong and you may put a surviving spouse's own property through a probate proceeding, or hand the IRS a basis number that costs the family real money on a later sale.

This guide is about that characterization question and the four consequences that run off it. It is written for the surviving spouse and for whoever is administering the estate, which are often the same person.

Attorney rules vary by state

A handful of states require a licensed attorney to administer probate — Arkansas, Illinois, Mississippi, and South Dakota, plus (for most estates) Florida, Louisiana, Missouri, Texas, and Wisconsin; California and New York generally let you handle routine administration yourself but require an attorney for contested matters; Indiana and Tennessee depend on the county. Check your state probate guide before assuming you can handle everything yourself.

The Nine States (and Their Local Vocabulary)

The IRS lists nine community property states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin (IRS Publication 555).

Three vocabulary notes, because the terminology trips people up:

Wisconsin says "marital property." The chapter is built on the same one-half concept, as the statute quoted above shows, but if you search Wisconsin's statutes for "community property" you will not find the operative rules.
Louisiana calls the whole process a "succession." Louisiana is a civil-law jurisdiction and its terminology diverges from the other eight across the board, not just on this point. Our guide to Louisiana succession covers that separately.
Texas and the others each have their own administration procedures layered on top of the community property rules. Texas in particular offers administration routes that change how much court involvement an estate needs -- see Texas independent vs. dependent administration.

What determines whether the rules apply to you is domicile, not the location of the asset. Publication 555 puts it this way: "Generally, the laws of the state in which you are domiciled govern whether you have community property and community income or separate property and separate income for federal tax purposes." A couple domiciled in Nevada owning a rental in Ohio is in a different position than a couple domiciled in Ohio owning a rental in Nevada.

Consequence 1: A Smaller Probate Estate

If the survivor already owns half, the deceased spouse's half is what is available to pass by will or by intestacy, alongside all of the deceased spouse's separate property.

That is the characterization rule. The procedural rule -- whether that half needs a court proceeding at all -- is set separately by each state, and several community property states provide shortcuts specifically for property going to a surviving spouse. California's is direct: when a spouse dies and property passes to the surviving spouse by will or intestacy, "the property passes to the survivor subject to the provisions of Chapter 2 (commencing with Section 13540) and Chapter 3 (commencing with Section 13550), and no administration is necessary" (Cal. Prob. Code § 13500). Those cross-referenced chapters matter -- the shortcut is not unconditional -- but the baseline is that spousal property is not automatically dragged through a full administration.

Washington offers a different mechanism, agreed in advance rather than applied after the fact. Its statute allows both spouses to jointly enter "any agreement concerning the status or disposition of the whole or any portion of the community property, then owned by them or afterwards to be acquired, to take effect upon the death of either" (RCW 26.16.120). A community property agreement executed with the required formalities can therefore do much of the work a probate proceeding would otherwise do. Two cautions the statute itself contains: creditors' rights are preserved notwithstanding such an agreement, and a court retains equitable jurisdiction to set one aside for fraud or other recognized grounds. If you find one of these in the file, it is one of the most important documents in the estate -- read it before you file anything.

The practical instruction for an executor: before opening a probate case, find out whether your state has a spousal shortcut and whether this estate qualifies. Opening a full administration you did not need costs months and fees. Our step-by-step probate checklist covers the general sequence; the spousal question belongs at the front of it.

Consequence 2: The Basis Reset That Only Community Property Gets

This is the largest dollar item in this guide, and it is a tax rule rather than a probate rule.

The general rule is that property acquired from a decedent takes a basis equal to "the fair market value of the property at the date of the decedent's death" (26 U.S.C. § 1014(a)). In a separate-property state, when one spouse dies owning half of a jointly held asset, that half typically gets the reset and the survivor's half keeps its old basis.

Community property is treated differently. Section 1014(b)(6) covers "[p]roperty representing the surviving spouse's one-half share of community property held by the decedent and the surviving spouse under the community property laws of any State," treating it as property acquired from the decedent for basis purposes. IRS Publication 555 states the result in plain terms: "If you own community property and your spouse dies, the total fair market value (FMV) of the community property, including the part that belongs to you, generally becomes the basis of the entire property." The condition is that "at least half the value of the community property interest must be includible in your spouse's gross estate."

Publication 555's own example makes the arithmetic concrete: community property with a basis of $80,000 and a fair market value of $100,000 at the first spouse's death produces a $50,000 basis for the survivor's half and $50,000 for the decedent's heirs' half -- the full $100,000 across both halves, rather than the survivor's half remaining at $40,000.

Why this is worth real attention:

It only helps if you know what the value was. The basis is measured at the date of death. If nobody establishes the date-of-death value of the house, the brokerage account, or the business interest, the benefit is theoretical and the family reconstructs it years later under pressure, during a sale.
It applies asset by asset, based on characterization. An asset that is actually the deceased spouse's separate property is not community property, and does not get this treatment for the survivor's side -- there is no survivor's side.
Publication 555 notes the rule does not apply to registered domestic partners. Where the couple's legal status is anything other than marriage, do not assume the rule carries over.

Whether a particular asset qualifies is a question for a tax professional, and it is one of the better uses of a few professional hours in an estate of any size. Our guide to taxes on inherited money covers the broader picture of what is and is not taxable to a recipient.

Consequence 3: Characterization Becomes the Actual Work

In a separate-property estate, the inventory question is "what did they own?" In a community property estate it is "what did they own, and in what character?" -- and the second half of that question is where the time goes.

The categories, roughly:

Character	Typical examples	Who it belongs to
Community / marital	Earnings during the marriage and what was bought with them	Both, in undivided halves
Separate	Owned before the marriage; received by gift or inheritance during it	The one spouse
Mixed / commingled	A pre-marriage account that received years of paychecks; a house bought before the marriage and paid down with marital earnings	Depends on tracing
Changed by agreement	Assets covered by a marital property agreement, a community property agreement, or a transmutation	Depends on the document

IRS Publication 555 describes the basic division the same way: community property is generally what spouses acquire during the marriage while domiciled in a community property state, while separate property includes what was "owned separately before your marriage" and "property either of you received as a gift or inherited separately."

The third row is where estates get hard. A brokerage account opened in 1998, before the marriage, into which thirty years of salary was deposited, is not obviously anything -- and the answer depends on records that may or may not still exist.

What this means practically is that the documents matter more here than in a separate-property estate. Worth collecting early:

Dates of acquisition for every significant asset, and where the couple was domiciled on each date
Any prenuptial or postnuptial agreement, marital property agreement, or community property agreement
Deeds, with their exact vesting language -- "community property with right of survivorship" is a different instrument from "community property"
Account opening dates and, where you can get them, historical statements for anything that predates the marriage
Documentation of gifts and inheritances received by either spouse during the marriage, which are the classic separate-property carve-out
The couple's residence history, state by state, with approximate dates

That list is also most of the estate inventory checklist with a characterization column added. Building it once, at the start, is what prevents re-litigating the same question at the inventory, at the tax return, and again at a sale three years later.

Consequence 4: Moving States Creates a Hybrid Estate

Community property character generally attaches at acquisition, based on where the couple was domiciled then -- and it does not automatically dissolve because the couple later moved somewhere else.

Several states have doctrines addressing the mirror image: property brought into the state that would have been community property if it had been acquired there. California's definition of quasi-community property covers, in substance, personal property wherever situated and California real property that the decedent acquired while domiciled elsewhere, which would have been community property had the decedent been domiciled in California at the time of acquisition (Cal. Prob. Code § 66).

For an executor, the consequence is concrete: a single estate can contain three kinds of property at once -- genuinely community, genuinely separate, and property whose character depends on which state the couple lived in during a particular span of years. A retirement account funded across a move is the textbook case.

This is a point to stop and get professional advice rather than reason it out. Where a couple has crossed the community-property line in either direction, the characterization of a large asset can turn on facts about domicile from decades ago, and the stakes include both who owns what and what the basis becomes. Our guide on ancillary probate for out-of-state property covers the related but separate problem of real estate sitting in a second state.

What Community Property Does Not Change

Four things people expect it to control, and it does not.

It does not override a valid beneficiary designation. An account that names a beneficiary generally pays to that beneficiary outside probate. That mechanism operates alongside the community property rules, not beneath them. A transfer-on-death brokerage account naming a child does not become a spousal asset because the couple lived in Nevada.

Federal pension law adds a spousal protection of its own, in the other direction. ERISA generally requires that a married participant's accrued benefit be paid as a qualified joint and survivor annuity, and that a surviving spouse receive a qualified preretirement survivor annuity if the participant dies before the annuity starting date. An election out is ineffective unless "the spouse of the participant consents in writing to such election," the consent "acknowledges the effect of such election," and it "is witnessed by a plan representative or a notary public" (29 U.S.C. § 1055). That protection comes from federal law covering ERISA plans -- IRAs are not governed by that provision, which is why an IRA naming a non-spouse behaves differently from a 401(k) doing the same thing. If you find a designation that does not name the surviving spouse, flag it; do not assume either that it simply controls or that community property quietly defeats it.

It does not resolve how title reads. Characterization and vesting are two layers. A deed can say "community property," "community property with right of survivorship," "joint tenancy," or nothing special, and the paperwork for updating the records differs in each case -- including whether an affidavit of survivorship will do the job. Our guide to transferring a deed to a surviving spouse walks through each vesting scenario, including the right-of-survivorship variant and what it does for basis.

It does not answer the debt question. Whether a debt is a community obligation, what property is available to satisfy it, and what a surviving spouse's own exposure is are state-law questions with genuinely different answers across the nine states, and they turn on when and why the debt was incurred. Washington's statute makes the general direction clear by preserving creditors' rights notwithstanding a community property agreement -- these arrangements are not a shield against creditors. Our guide to which debts are forgiven at death covers the general framework; in a community property state, treat the specifics as something to confirm locally rather than infer.

Opt-In Community Property: Check the Trust Documents

A small number of separate-property states have statutes allowing married couples to elect community-property treatment for assets placed in a specially drafted trust, generally for the basis benefit described above.

You do not need to know the statutory landscape to handle this correctly as an executor. You need one habit: if the estate planning file contains a trust that uses community-property language in a state where you would not expect it, do not dismiss it as boilerplate. Take the document to an attorney, because if it is operative it changes the characterization analysis and potentially the basis of everything inside it. Whether a given state has such a statute, and whether a given trust actually satisfies it, is a legal question specific to that document.

A Working Sequence for the Surviving Spouse or Executor

Confirm the couple's domicile at death, and build the residence history with approximate dates.
Pull the estate planning file and look specifically for a prenuptial or postnuptial agreement, a marital property or community property agreement, and any trust using community-property language.
List every significant asset with its acquisition date and the state the couple lived in then.
For each asset, record a preliminary character: community, separate, or unresolved. Keep the unresolved column honest rather than tidy.
Pull deeds and read the exact vesting language, not the summary on a tax bill.
Pull every beneficiary designation -- retirement accounts, life insurance, annuities, transfer-on-death registrations -- and note any that do not name the surviving spouse.
Establish date-of-death values for anything that could later be sold. This is the step that makes the basis rule real instead of theoretical.
Find out whether your state has a spousal transfer procedure that avoids or shortens administration, and whether this estate qualifies, before filing anything.
Inventory the debts with dates and purposes, and hold the liability question for a local answer.
Take the unresolved characterization column, the cross-state assets, and the off-spouse beneficiary designations to a professional as one package rather than three separate questions.

Where Professional Help Earns Its Cost

Most estate administration is organizational work a careful person can do. Community property characterization is one of the genuine exceptions, and it is worth being direct about why.

An attorney earns the fee where a large asset's character is unresolved, where the couple moved between a community property state and a separate-property state while holding significant assets, where a marital property agreement or community property agreement exists and its effect is unclear, where a beneficiary designation cuts against the surviving spouse, or where creditors are asserting claims against a surviving spouse personally. A tax professional earns it on the basis question -- confirming which assets qualify for the treatment under § 1014(b)(6), and establishing date-of-death values in a form that will hold up at a sale years later.

Those are narrow questions with defined answers, which is what professional hours are good at. Deciding whether to bring someone in is a judgment call about the specific estate in front of you, and arriving with the asset list, the acquisition dates, the residence history, and the documents already assembled is what makes that an informed decision instead of a guess -- and makes the hours you do buy cheaper, because nobody is billing you to build the file.

How SwiftProbate Helps

SwiftProbate is probate task management software. It helps you understand what needs to happen in an estate, organize documents and assets in one place, and track what is done and what is still open.

A community property estate is a good illustration of why that matters. The work is not one task -- it is a residence history, an asset list with an extra characterization column, a document hunt across decades, a set of date-of-death values that only matter later, a beneficiary-designation review, and a procedural question about whether a court filing is even required. Each piece is manageable. Held in your head during the weeks after a spouse dies, they are not.

SwiftProbate keeps the asset list, the deeds, the agreements, and the valuations attached to the estate rather than scattered across an inbox and a filing cabinet, and holds the open questions as tasks instead of things you are hoping to remember before the next deadline.

If you are at the beginning of this, what to do when a spouse dies lays out the first weeks in order, and the step-by-step probate checklist covers the overall sequence that the characterization work feeds into.

SwiftProbate provides software to help navigate the probate process. SwiftProbate is not a law firm, does not provide legal advice, and is not a substitute for the advice of a licensed attorney. Probate laws vary by state and county. No attorney-client relationship is created by using this service.

Community-Property States: What Changes for the Surviving Spouse