Estate Settlement in Community Property States vs. Common Law States: A Comparative Guide

The state where a married couple lives determines how their property is divided at death. Nine US states operate under community property law, which treats marriage as an economic partnership where each spouse owns 50% of all assets acquired during the marriage. The remaining 41 states follow common law property rules, where spouses can own separate or joint property with different tax and estate settlement consequences.

For estate professionals, this distinction matters enormously. The difference between community property and common law treatment can mean the difference between paying $100,000 in capital gains taxes and paying nothing. It affects how title to real estate is transferred, whether spousal assets pass automatically outside probate, how retirement plans are treated, and what happens when a spouse moves between states or remarries.

The Core Difference: How Property Ownership Is Defined

Community property law rests on a simple principle: property acquired during marriage (except gifts and inheritances) is owned equally by both spouses. Neither spouse can unilaterally sell, transfer, or encumber community property without the other's consent. Each spouse owns an undivided 50% interest in the whole.

Common law property systems treat marriage as a contract where property ownership is separate unless the deed or title document explicitly creates joint ownership. A married person can own property individually, jointly, in tenancy by the entirety (in some states), or as part of a partnership or business. The default is separate ownership, not joint.

The nine community property states are California, Texas, Arizona, Idaho, Nevada, New Mexico, Washington, Wisconsin, and Louisiana. Each has slightly different rules about what counts as community property and how it passes at death, but all share the 50-50 presumption for assets acquired during marriage.

Several other states occupy a middle ground. Alaska, Kentucky, South Dakota, Tennessee, and a few others allow couples to opt into community property treatment through written agreement without moving. These are sometimes called quasi-community property jurisdictions. Arizona and California recognize quasi-community property acquired elsewhere, which matters when clients move between states.

Understanding which system governs a client's primary residence and major assets is the first step in planning estate settlement. The implications are not subtle.

The Stepped-Up Basis Advantage in Community Property States

The federal income tax basis of an asset is its cost. If someone buys stock for $50,000 and it appreciates to $150,000 during their lifetime, the basis stays at $50,000. Selling the stock generates a $100,000 capital gain taxed at federal rates up to 20%, plus state income tax and possibly net investment income tax. Over a lifetime, this can represent tens or hundreds of thousands of dollars in accumulated tax.

When someone dies, federal law allows the basis of their assets to be "stepped up" to fair market value on the date of death. If that stock is worth $150,000 when the owner dies, the basis becomes $150,000. If the heir sells immediately, there is no gain and no tax. This stepped-up basis is one of the largest tax benefits in the Internal Revenue Code. It applies to all assets, including real estate, securities, cryptocurrency, art, and business interests.

In community property states, both halves of community property receive a full stepped-up basis at the first spouse's death. If a California couple owns a home worth $2 million with an original cost basis of $800,000, and the wife dies, both the wife's 50% and the husband's 50% step up to $1 million each. The entire property now has a basis of $2 million. If the home is sold shortly after, there is no capital gains tax.

In common law states, only the deceased spouse's portion of jointly held property receives a stepped-up basis. If the same $2 million home is held as joint tenants with rights of survivorship, only the deceased spouse's 50% steps up to $1 million. The surviving spouse's original basis remains at $400,000 (half of $800,000). If the home is sold, the surviving spouse owes capital gains tax on the $600,000 appreciation attributable to their half. At a 20% federal rate plus state tax, this could mean $150,000 or more in taxes.

This difference alone can justify sophisticated planning in high-appreciation states like California and Texas. A couple with a $5 million portfolio accumulated over 40 years might have gains of $3 million. In a community property state, that entire $3 million steps up at the first spouse's death. In a common law state, only half steps up, leaving $1.5 million in taxable gains.

Some common law states try to approximate community property basis treatment through portability, a federal election that allows a surviving spouse to use the unused exemption of the deceased spouse. But portability only addresses estate tax, not income tax basis. It does not solve the capital gains problem for appreciated assets.

Estate settlement professionals in common law states often recommend that aging couples convert separate property to joint tenancy or tenancy by the entirety to ensure both halves receive a stepped-up basis. This requires careful attention to gift tax implications and state-specific rules, and may create unintended consequences if the marriage is unhealthy.

Real Scenario #1: Spousal Property Transfers at Death in Community Property States

Consider a California couple: Michael (age 68) and Jennifer (age 66). They married in 1985 and have accumulated $2.8 million in assets during their marriage: a home worth $1.2 million, a brokerage account with $900,000, mutual funds with $400,000, and retirement accounts (IRAs and a 401k) totaling $300,000. Michael's basis in the home is $450,000. His basis in the brokerage account is $200,000. The home has appreciated $750,000; the brokerage account has appreciated $700,000.

Jennifer dies in 2026. Her will leaves her estate to their two adult children. Under California community property law, Jennifer owns 50% of all community property acquired during marriage. Her estate includes her half of the home ($600,000 fair market value, $225,000 basis), her half of the brokerage account ($450,000 fair market value, $100,000 basis), her half of the mutual funds ($200,000), and her half of the retirement accounts ($150,000, but with special rules for IRAs and 401ks).

At Jennifer's death, her 50% of community property steps up to fair market value. But something more important happens: Michael's 50% also steps up. This is the unique rule in community property states. Michael's basis in his 50% of the home jumps from $225,000 to $600,000. His basis in his 50% of the brokerage account jumps from $100,000 to $450,000.

The settlement process requires retitling the property. The home, held in both names as community property, needs a new deed reflecting Michael's full ownership. The brokerage account, if held jointly, may automatically transfer to Michael or may require court confirmation depending on California law. The mutual funds follow similar rules.

The children, as beneficiaries of Jennifer's estate, receive her 50% at stepped-up basis. They can sell immediately with no income tax. Michael can retain his 50%, now with a stepped-up basis of $600,000 each on the home and $450,000 on the brokerage account. If Michael and the children later sell the home, the tax basis is nearly $2 million, matching current fair market value. The $1.5 million in embedded gains that existed during Jennifer's lifetime is eliminated through the stepped-up basis rule.

The title work is straightforward: California recognizes spousal property transfers outside probate, and community property transfers to surviving spouses are often automatic if the property is properly titled. Real estate transfers are recorded in the county recorder's office. Bank and brokerage accounts require beneficiary designation changes or probate if not named.

This scenario illustrates why community property states are attractive for couples with substantial accumulated wealth. The tax efficiency is automatic, requiring no special trusts, no complex planning, no elections. The law itself provides the benefit.

Real Scenario #2: The Remarriage Complication in Community Property States

Now consider a more complex scenario: what happens when a surviving spouse remarries in a community property state.

Mark and Susan were married for 38 years in Arizona and accumulated significant assets: a home, commercial real estate, several investment accounts. When Susan dies in 2024, Mark inherits her community property share. His 50% and her 50% both step up in basis. Mark is 71 years old, and at an Arizona social event, he meets Patricia, a 68-year-old divorcee. They marry in early 2025.

Mark and Patricia begin acquiring new assets: they buy a vacation home together for $400,000 (down payment from Mark's stepped-up assets, mortgage in both names). Patricia contributes $150,000 from her savings. Mark contributes $250,000. Over 18 months, they acquire $150,000 in a brokerage account funded from Mark's income. All of this is presumed community property under Arizona law.

In late 2025, Mark dies unexpectedly. He has a will leaving everything to his children from his first marriage. Patricia, his surviving spouse, is now a community property co-owner of assets she did not bring into the marriage.

The estate settlement becomes complicated. Mark's children argue that Susan's original assets, even if later commingled, should be treated as his separate property because they originated in his first marriage. Patricia argues that the vacation home, purchased during her marriage to Mark, is community property of which she owns 50%. She may also have an elective share claim in Arizona (the surviving spouse's statutory right to a portion of the estate).

At Mark's death, his 50% of all community property steps up. But Patricia's 50% does not. She retains her 50% at her original basis. She now owns the vacation home at a stepped-up basis of $400,000 (her current value of her half) plus whatever her adjusted basis was in her original $150,000 contribution. The children, through Mark's estate, own 50% with a stepped-up basis to $400,000.

If the home is sold a year later for $450,000, there is a $50,000 gain. The children's half ($225,000) steps up to $225,000 with no tax. Patricia's half steps up to $225,000, but if she later contributes her share to a taxable event, she may owe tax on her portion of the gain depending on how her contribution is traced.

Louisiana adds another layer. Louisiana recognizes community property but has special rules for succession that differ significantly from California or Texas. A surviving spouse may not own 100% of community property in Louisiana; instead, the couple's property passes partially to the surviving spouse and partially to heirs according to a statutory formula. The goal of forced heirship is to ensure children inherit, but it creates different settlement mechanics than in other community property states.

The lesson for estate professionals: remarriage in a community property state requires careful documentation of what property is separate (pre-marriage acquisition, inheritances, gifts) and what is community (acquired during the current marriage). Tracing becomes crucial, and the lack of clear tracing can result in property being treated as community when the client intended it to be separate.

Separate Property in Community Property States

Community property law does not treat all property acquired during marriage as community. Inheritances remain separate property of the inheritor. Gifts received during marriage remain separate property. Property acquired before marriage remains separate. Property acquired with the proceeds of separate property often remains separate, though tracing is required.

The challenge is that community property and separate property often become commingled. A couple inherits $300,000 and deposits it into a joint brokerage account where they also deposit salary income from both spouses. The account grows to $800,000 over five years. How much is community property and how much is separate?

In many community property states, the presumption is that property held in joint form is community property. The person claiming separate property has the burden of tracing it with "clear and convincing evidence." This is a high bar. Commingled funds in a joint account are presumed community unless the spouse can document the source of each deposit.

Estate settlement in community property states requires searching for separate property documentation: inheritance statements, gift letters, prenuptial agreements, separate bank accounts, and any other evidence of non-community origins.

Consider: Martha inherits $400,000 from her parents' estate in 2010. She puts it in a joint investment account with her husband David. Over ten years, the account grows to $900,000 from investment returns and additional deposits from both their salaries. David dies in 2025. Martha claims that her share of the $900,000 is her separate property, not subject to community property division. David's children from a first marriage claim it should be treated as community property.

If Martha has documentation (a check from the probate estate, a separate account statement, even emails about the inheritance) showing the $400,000 deposit, she may be able to trace at least that amount to her separate property. The growth on that $400,000 might also be considered separate property, depending on the state. Any deposits funded from joint salary income after the inheritance would be presumed community.

California, Texas, and other community property states handle this differently, and the distinction matters. California generally presumes that growth on commingled separate property remains separate if the separate property is traceable. Some other community property states treat all growth as community once property is commingled.

Smart estate planning in community property states includes maintaining separate accounts for separate property and documenting the source of all deposits. At settlement, this documentation becomes critical to ensuring the correct assets pass to the correct beneficiaries with the correct tax basis treatment.

Common Law State Spousal Property Management at Death

In common law states, spousal property rights are defined primarily by title and by statute. If the deed to the home says "John Smith and Mary Smith, joint tenants with right of survivorship," then upon John's death, Mary owns the entire home automatically. The property passes outside probate.

If the deed says "John Smith, married to Mary Smith," then John owns it individually, and it passes through his probate estate. Mary has no automatic right to it, though she may have an "elective share" right under state law (the right to claim a percentage of the estate, typically 25% to 50%, regardless of what the will says).

This creates a fundamental difference from community property states. In common law states, the default rule is separate ownership, not joint. Most married people have a mixture of separate property, joint property, and property held in trusts or with beneficiary designations.

For estate settlement, this means the probate estate in a common law state may be much larger or smaller than in a community property state, depending on how title is held. A couple that owns a home jointly and has their retirement accounts titled with each other as beneficiaries might have a probate estate of nearly zero, with most assets passing outside probate. The same couple in a community property state would have the same economic outcome, but the legal mechanism is different.

The tax implications are also different. In common law states, joint property is often held as "tenants in common," which means each spouse owns a fractional share (usually 50%) and can leave it to anyone in their will. At the death of the first spouse, only that spouse's 50% receives a stepped-up basis. The survivor's 50% retains the original basis. This is a significant disadvantage compared to community property states.

Alternatively, common law states offer "tenancy by the entirety" in some contexts (though not for stocks or accounts), which provides some of the benefits of joint ownership with a right of survivorship. Both spouses' interests are unified, and creditors cannot reach the property. At death, the survivor's portion steps up, similar to community property. But tenancy by the entirety is narrower than community property and requires specific title language.

Many elderly couples in common law states, upon learning about the capital gains tax implications of holding property separately, convert to joint tenancy to get both portions to step up at the first death. This requires a new deed and gift tax reporting, but it's a common and legal planning technique.

The elective share is another key feature of common law property states. The surviving spouse can reject the will and claim a statutory share instead, typically 25% to 50% of the probate estate. This protects spouses from disinheritance. But it also means that will planning is more constrained; a client cannot leave everything to their children and completely disinherit a spouse without running the risk that the spouse will claim elective share.

Probate in common law states is often longer and more expensive because more assets pass through the probate estate. Property must be titled carefully to avoid probate, and many common law state clients use revocable living trusts to avoid probate for real estate and other assets. Community property states have fewer probate avoidance techniques because property passes more naturally.

Multi-State Considerations: Clients Who Move Between Systems

Increasingly, estate professionals encounter clients who have lived in multiple property systems or own property in more than one state. An attorney client who moved from California to Florida, or a retiree who bought a vacation home in Arizona, must understand how property is characterized in each state.

The basic rule is that property is characterized according to the law of the state where it is located (for real estate) or the state where the owner was domiciled when acquired (for movable property like stocks and cash). A couple who owned a home in Texas when they bought it, acquired during marriage, would have that home treated as Texas community property. If they later moved to Florida, the home remains Texas community property, governed by Texas law, not Florida common law.

This creates complexity in estate settlement. An executor or estate administrator must identify the location of each asset and apply the correct state law. Real estate in California is treated as California community property. Stocks held in a brokerage account are treated according to the law of the client's domicile when the stocks were acquired.

Retirement accounts add another layer. IRAs are governed by federal law, not state property law, though the beneficiary designation is crucial. A spouse who is named as beneficiary receives the IRA outside probate and may have the option to roll it into their own IRA. A non-spouse beneficiary does not have this option.

In some cases, federal law preempts state property law. Employee Stock Ownership Plans (ESOPs) and some other plans have federal rules about spousal consent and beneficiary designation that override state property laws.

Divorce and subsequent remarriage between different property systems can also create complications. A couple divorced in California, where community property was divided equally, might later remarry in a common law state. The property acquired before the divorce in California was divided according to community property principles. The property acquired after moving to a common law state is divided according to different principles if they later divorce again or if one spouse dies.

A practical scenario: Richard and Susan were married in California in 1985. They accumulated $4 million in community property. They divorced in 2005, and Susan received $2 million in the divorce settlement, recognized as her separate property. Richard kept $2 million. In 2010, Richard moved to Texas and remarried Patricia. Together, Richard and Patricia accumulated another $2 million in Texas property between 2010 and 2025. Richard dies in 2025.

The estate includes Richard's original $2 million from the California divorce (his separate property, subject only to federal estate tax). It includes the $2 million in Texas property acquired with Patricia (Texas community property, 50% Patricia's by operation of law). Patricia's community property interest in the Texas property is not subject to Richard's probate estate; it automatically passes to her. Richard's $2 million in separate property from the California divorce, however, passes through his will or by intestacy to his heirs.

The stepped-up basis treatment is also mixed. Patricia's 50% of the Texas community property receives a stepped-up basis. Richard's 50% receives a stepped-up basis. His original $2 million from California, now held separately, receives a stepped-up basis at his death.

For estate professionals, multi-state clients require careful tracking of property characterization, location of title, and the applicable state and federal law. A simple spreadsheet identifying each asset, its location, its characterization (community or separate, or joint), and the applicable law is essential.

Quasi-Community Property and Optional Community Property

A small but growing number of jurisdictions allow married couples to opt into community property through written agreement, even though state law would otherwise recognize separate property. Alaska was the first to permit this, in 1998, and now other states including South Dakota, Kentucky, and Tennessee allow similar elections.

In these states, a married couple can execute a Uniform Marital Property Act (UMPA) agreement to treat their property as community property for state law purposes. This allows couples to get the benefits of community property tax planning without actually moving to a community property state.

Arizona and California go further and recognize quasi-community property: property acquired outside of a community property state (while the couple was domiciled elsewhere) that would have been community property if it had been acquired in a community property state. If a couple lived in New York for 20 years, accumulating property under common law principles, and then moved to California, that out-of-state property may be treated as quasi-community property in California for purposes of the wife's will and death (but not in the husband's hands). The rules are complex and different in each state.

These jurisdictions create planning opportunities for sophisticated clients. A couple in a common law state can move to Alaska, execute a community property agreement, retitle their property, and then receive the community property stepped-up basis benefit at death, even though they were not originally domiciled in a community property state.

For estate professionals, this means that a client's state of domicile at the time of death controls the treatment of property for federal estate tax and income tax basis purposes. A client who moves to a community property state, or who executes a community property agreement, in the years before death can potentially save hundreds of thousands in capital gains tax.

FAQ

Q: Does community property step-up in basis require any special election or trust language?

A: No. The stepped-up basis is automatic under federal law and applies to all community property at the first spouse's death. No special trust, no election, no additional tax return requirement is needed for the basis step-up itself. However, to ensure the property is actually treated as community property, the title should clearly reflect that status (e.g., "Spouses as Community Property" or similar language depending on the state). Some community property states have specific language requirements or may require updated documentation at death.

Q: If spouses are married in a common law state and later move to a community property state, does their existing property become community property?

A: Generally, no. Property is characterized according to the law of the jurisdiction in which the spouses were domiciled when the property was acquired. If a couple bought a home in New York in 1995 while domiciled there, it remains characterized as common law property even if they later move to California. However, California and some other community property states recognize quasi-community property, which is out-of-state property that would be community property if it had been acquired within the community property state. The rules for quasi-community property vary, and they apply only at the death of the spouse who acquired the property, not to the surviving spouse's half.

Q: Does the portability election in the federal estate tax code solve the basis problem in common law states?

A: No. Portability allows a surviving spouse to use the deceased spouse's unused federal estate tax exemption, but it does not create a stepped-up basis for the surviving spouse's portion of jointly held property. A couple with $5 million in jointly held property in a common law state can use portability to avoid federal estate tax on a total estate of up to $13.61 million (in 2024). However, the surviving spouse's half of the property still retains the original basis, and capital gains tax is due when that half is sold. Only the deceased spouse's half receives the stepped-up basis. Portability is an estate tax tool, not an income tax tool.

Q: What is the risk of commingling separate property with community property in a community property state?

A: The primary risk is loss of tracing. Once separate property is commingled in a joint account with community property, the burden shifts to the person claiming separate property status to prove the amount and origin of the separate contribution. Courts will presume that commingled property is community property unless clear and convincing evidence of the separate source is presented. To avoid this, maintain separate accounts for separate property, document all deposits, and obtain a written family law agreement or prenuptial agreement identifying what property will be treated as separate. At the time of settlement, the lack of documentation can result in property being incorrectly classified as community or in disputes among heirs.

How Afterpath Helps

Estate settlement across different property systems requires understanding not just local probate rules, but the interaction between state property law, federal tax law, and the client's specific financial situation. Whether you're managing a community property estate with automatic stepped-up basis benefits, navigating the elective share rules in a common law state, or tracing commingled separate property in a multi-state family situation, the complexity requires precise tracking of assets, jurisdictional rules, and tax implications.

Afterpath Pro is built specifically for estate professionals who need to organize and execute complex settlements. The platform helps you map assets by property type and jurisdiction, document the basis and acquisition history for tax planning, track the beneficiaries and their rights under state law, and coordinate with other professionals (CPAs, tax attorneys, family law advisors) who need to weigh in on property characterization and settlement mechanics.

For detailed guidance on the fundamentals of estate settlement across state lines, explore our articles on tax elections for estate professionals, state variation in Medicaid estate recovery, and the hidden costs of probate delay.

Ready to simplify multi-state estate settlement? Explore Afterpath Pro or join our professional waitlist for early access to advanced features for tax basis tracking and multi-state asset management.