Your Inheritance Is 100% Yours Until You Deposit It in the Wrong Account. The One-Word Rule (“Commingling”) That Decides Whether It Stays Yours

Depositing inherited funds into a joint account can legally convert 100% of that inheritance into marital property, split evenly in divorce.

Open a sole-name account at a bank where you hold nothing jointly and never run a paycheck, tax refund, or joint expense through it.

Even a clean inherited principal loses protection if interest, dividends, or gains from active management get reclassified as marital property.

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If you just inherited money from a parent, aunt, or grandparent, here's a rule the funeral-home paperwork won't tell you: your inheritance is legally 100% yours, separate from your spouse, until the moment you deposit it into the wrong account. One wire transfer into a joint checking account can flip that money from separate property to marital property , and in a divorce, your spouse walks away with half. The legal term for this trap is commingling , and it's the single most expensive mistake heirs make in the first 90 days after a check clears.

Under family law in every U.S. state, property you inherit is treated as separate from marital assets, even if you're married when you receive it. That protection is automatic. You don't have to file anything. But the protection is fragile: the second inherited funds get mixed with marital money in a way that can't be untangled, courts can and do reclassify the entire balance as marital property subject to division. Deposit $200,000 of Mom's estate into the joint account you use to pay the mortgage, let a few paychecks flow through, and by the time a divorce is filed, that money has become "ours."

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The rule comes from state family law, not the IRS. In the nine community property states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin), statutes like California Family Code §770 explicitly define inheritances as separate property, but case law (starting with See v. See, 64 Cal. 2d 778) makes clear that commingling without adequate records converts the whole account to community property. In equitable-distribution states, the same doctrine applies through the Uniform Marital Property Act and decades of divorce case law. The burden of proof is on you, the inheriting spouse, to trace every dollar back to its separate source.