In a common law property state, whichever spouse’s name is on the title owns the asset, even if it was bought during the marriage with joint income. That rule governs day-to-day ownership in forty-one states and the District of Columbia. It gets set aside at divorce, when courts divide marital property fairly regardless of title, and at death, when a surviving spouse can claim a minimum share of the estate no matter what the will says. Understanding where title controls and where it doesn’t is the whole game.
Which States Use This System
Every state except nine follows common law property rules. The community property jurisdictions are Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. If you live anywhere else, common law principles govern how your marital property is classified, divided in divorce, and distributed when a spouse dies.
A handful of common law states let married couples opt into community property treatment for specific assets through a community property trust. The main draw is a tax benefit at death, discussed below. Roughly five states currently authorize these trusts, and setting one up requires an estate planning attorney who understands both the trust requirements and the federal tax treatment.
Separate Property vs. Marital Property
The single most important distinction in a common law state is the line between separate property and marital property. This classification decides what a court can divide in divorce, what an elective share claim reaches, and how creditors can collect.
Separate property is anything you owned before the marriage, plus gifts and inheritances received by one spouse alone during the marriage. A car you bought two years before the wedding, or a bank account your grandmother left you in her will, stays separate as long as you keep it apart from jointly held funds. Marital property is everything else acquired during the marriage, regardless of which spouse earned the money or whose name appears on the title. Most wages, investment gains, real estate purchases, and retirement contributions accumulated between the wedding date and the date of separation are marital property.
Here is the key point about how this classification interacts with ownership. During the marriage itself, title controls who manages and makes decisions about an asset. At divorce, courts look past the name on the deed to divide marital property fairly. At death, the elective share calculation sweeps in a broader pool of assets. Title tells you who controls an asset today; classification tells you who has a legal claim to it when things change.
How Separate Property Can Turn Into Marital Property
Separate property can lose its protected status through a process called transmutation, and by the time spouses realize what happened, the damage is usually done.
The most common trigger is commingling. If you deposit an inheritance into a joint checking account, or use premarital savings to make payments on a jointly titled home, those once-separate funds can become marital property. Once separate and marital money are mixed in the same account, tracing which dollars belong to whom becomes difficult or impossible. The spouse claiming the funds are still separate carries the burden of proving it, and old bank statements don’t always cooperate.
Adding your spouse to the title of a premarital asset is another path to transmutation. Putting your spouse’s name on the deed to a home you owned before the wedding is generally treated as a gift to the marriage. Reversing that presumption later requires clear and convincing evidence that no gift was intended. When marital funds pay down the mortgage on one spouse’s separate property, the contributing spouse builds an equitable claim to a portion of that property’s value, even if the title never changes.
The protection is simple but requires discipline: keep separate assets in accounts titled only in your name, don’t deposit marital earnings into those accounts, and document the source of any funds used for major purchases. A prenuptial or postnuptial agreement provides even stronger protection and can reclassify property, waive rights, or set custom terms for a divorce, though courts hold these agreements to strict procedural standards.
Title and Ownership While the Marriage Is Intact
During an intact marriage, ownership follows the paperwork. If you buy a car and register it solely in your name, you have full legal control over it. Financial institutions and government agencies look at registered title when processing loans, sales, or transfers. They don’t care that your spouse contributed half the purchase price from a joint account.
This is where common law states can feel unfair. One spouse might earn all the household income and title every major asset in their name alone, leaving the other spouse with no legal ownership of anything. The law addresses this imbalance at divorce and death, but during the marriage the titled spouse calls the shots.
Many couples avoid this problem by titling assets jointly. The two main forms of joint ownership are joint tenancy with right of survivorship and tenancy by the entirety. Joint tenancy means both spouses own an equal share, and when one dies, the other automatically inherits the full asset without probate. Tenancy by the entirety, available only to married couples, adds another layer: neither spouse can sell or encumber the property without the other’s consent, and individual creditors of one spouse generally cannot reach the asset.1Legal Information Institute. Tenancy by the Entirety Choosing the right form of title at the time of purchase is one of the most consequential financial decisions married couples make, and most don’t give it a second thought.
What Happens at Divorce
The title rule that governs day-to-day ownership gets largely set aside when a marriage ends. Courts in common law states apply equitable distribution, dividing marital property in a way that is fair given the circumstances, not necessarily a fifty-fifty split.2Legal Information Institute. Equitable Distribution This gives judges broad discretion, and outcomes vary based on the facts of each case.
What Judges Weigh
Common factors include the length of the marriage, each spouse’s income and earning potential, contributions to the other spouse’s education or career, the value of each spouse’s separate property, and the age and health of both parties. Non-financial contributions count too. A spouse who left the workforce to raise children has a recognized claim even though they earned no income during that period.
Courts also consider the liquidity of the assets at stake. Splitting a bank account is simple. Splitting a family home or a retirement account is not. The practical difficulty of dividing certain assets often shapes the outcome as much as the legal factors do.
Retirement Accounts and Pensions
Employer-sponsored retirement plans present a specific problem because federal law generally prohibits assigning or transferring pension benefits to anyone other than the plan participant.3Office of the Law Revision Counsel. 29 USC 1056 – Form of Payment Congress created an exception for divorce. A Qualified Domestic Relations Order allows a state court to direct a retirement plan to pay a portion of one spouse’s benefits to the other spouse or a dependent.4Internal Revenue Service. Retirement Topics – Qualified Domestic Relations Order The order must meet specific requirements and be approved by the plan administrator before it takes effect.5U.S. Department of Labor. Qualified Domestic Relations Orders Under ERISA – A Practical Guide to Dividing Retirement Benefits
Drafting a QDRO that complies with both federal rules and the specific plan’s terms is one of the most technical parts of a divorce settlement. Getting it wrong can mean the plan rejects the order entirely, leaving the non-participant spouse with no share of what is often the largest marital asset outside the home.
Business Interests and Professional Practices
When one spouse owns a business or professional practice, valuation becomes the central fight. Courts look at what a willing buyer would pay for the business, including any goodwill it has built during the marriage. Enterprise goodwill, meaning the value of the business’s reputation, client relationships, and brand, is generally treated as a marital asset subject to division. Personal goodwill tied solely to one spouse’s individual reputation or skill is usually classified as separate property.
These valuations require forensic accountants or business appraisers, and contested valuations can run into five figures. The expense is often justified because the gap between competing valuations can be hundreds of thousands of dollars.
What Happens When a Spouse Dies
Because common law ownership means a spouse can die owning everything in their name alone, every common law state provides a safety net: the elective share. This lets a surviving spouse claim a minimum portion of the deceased spouse’s estate, overriding whatever the will says.6Legal Information Institute. Elective Share Without this right, a spouse who spent decades raising children and managing a household could be completely disinherited.
How Much the Surviving Spouse Can Claim
The traditional fraction is one-third of the estate, and many states still use that flat percentage. Others have adopted a sliding scale based on how long the marriage lasted, with the share increasing over time and reaching as high as fifty percent of the total estate after fifteen or more years of marriage. The logic is that longer marriages produce more shared wealth, so the surviving spouse’s claim grows accordingly.
The estate used for this calculation is broader than just what passes through the will. Under what’s known as the augmented estate, the total includes the deceased spouse’s probate assets (after subtracting debts and funeral costs), any assets the deceased transferred outside probate (like joint accounts or life insurance), and even the surviving spouse’s own property.7Legal Information Institute. Augmented Estate This wider net prevents a spouse from dodging the elective share by moving assets into trusts or pay-on-death accounts before dying.
Deadlines and Ways the Right Can Be Lost
Claiming the elective share is not automatic. The surviving spouse must file a formal petition with the probate court, and most jurisdictions impose a deadline of roughly six months after the death or after the will is admitted to probate. Missing that window usually means waiving the right permanently.
The right can also be lost in other ways. A valid prenuptial or postnuptial agreement that waives the elective share will be enforced if it meets the procedural requirements. A spouse who had pending divorce proceedings at the time of the other spouse’s death is generally barred from claiming the share. And the right belongs only to the surviving spouse personally; it cannot be exercised by heirs after the survivor dies.
Liability for Your Spouse’s Debts
Debt responsibility in common law states follows the same individual-ownership logic as assets. The spouse who signed for the debt is the one who owes it. If your spouse opens a credit card in their name alone, creditors cannot come after your personal savings or assets to collect on that balance. This is one of the clearer advantages of the common law system.
Joint debts are the obvious exception. When both spouses co-sign a mortgage or a car loan, both are fully liable for the entire balance. Creditors can pursue either spouse for the full amount, not just half. This joint and several liability survives divorce. A divorce decree might assign the mortgage payment to one spouse, but the lender isn’t bound by that agreement. If the responsible spouse stops paying, the bank comes after both.
The Doctrine of Necessaries
The most significant exception to individual debt responsibility is the doctrine of necessaries, which can hold one spouse liable for the other’s expenses related to essential needs like medical care, food, and housing. If your spouse receives emergency medical treatment and can’t pay the bill, the hospital or provider may have a legal claim against you even though you never signed anything.
The scope of this doctrine varies considerably by jurisdiction. Some states have abolished it entirely. Others apply a modernized version where the non-debtor spouse is only secondarily liable, meaning the creditor must first exhaust the debtor spouse’s resources before turning to the other. A few states still apply it unevenly, holding husbands liable for wives’ necessaries but not the reverse. Because the rules differ so much, understanding how your jurisdiction handles this exception matters if your spouse is accumulating medical debt or other essential expenses.
The Step-Up in Basis Gap
The common law property system creates a meaningful tax disadvantage that most couples never think about until one spouse dies. When someone dies, the tax basis of their property resets to the current fair market value, which can eliminate years of capital gains for whoever inherits it.8Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent The catch is that in a common law state, only the deceased spouse’s share of jointly held property gets this reset. The surviving spouse’s half keeps its original basis.
Say you and your spouse bought a home together for $400,000, and it’s worth $700,000 when your spouse dies. In a common law state, the deceased spouse’s half gets a new basis of $350,000, but your half keeps its original basis of $200,000. Your total basis is $550,000, leaving $150,000 in taxable gain if you sell. In a community property state, both halves get the step-up, giving you a full $700,000 basis and no taxable gain at all.8Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent
This gap is why community property trusts exist. Couples in common law states who hold highly appreciated assets, particularly real estate or long-held investment portfolios, can potentially capture the full double step-up by holding those assets in a community property trust where authorized. The tax savings on a single property can easily reach tens of thousands of dollars.
What Changes If You Move
If you move from a common law state to a community property state, or vice versa, the classification of your existing assets generally doesn’t change. Property you earned and titled in a common law state remains the titled spouse’s separate property, even after you establish a new home in a community property jurisdiction. The law that applied where you lived when you acquired the asset controls its classification.
Some community property states address this gap through quasi-community property rules. Under these rules, assets that would have been community property if the couple had lived in the community property state when they were acquired get treated as community property for purposes of divorce or death. The non-earning spouse in the original common law state gets some protection they wouldn’t have had otherwise. Moving in the other direction, from a community property state to a common law state, is simpler because the community property classification generally follows the asset.
Couples who relocate across property-system lines should review their estate plan and titling arrangements after the move. What worked in your previous state may produce unintended results under a different property regime, particularly for jointly held real estate and retirement accounts.