What the rule says
Wisconsin adopted the Wisconsin Marital Property Act effective January 1, 1986, codified at Wis. Stat. § 766.01 et seq. Wisconsin is the only Midwestern state with a community property regime, and one of only nine community property jurisdictions in the United States (along with California, Texas, Arizona, Washington, New Mexico, Nevada, Idaho, and Louisiana).
The Wisconsin Marital Property Act establishes:
- Marital property: All property acquired by either spouse during marriage with marital funds or labor while domiciled in Wisconsin or another community property jurisdiction - Individual property: Property acquired before marriage; property acquired during marriage by gift or inheritance; property classified as individual through marital property agreement - Equal ownership: Both spouses own each marital property item equally, regardless of how the property is titled
Wisconsin uses the term "marital property" rather than "community property" but the legal concepts are substantially similar. The framework was modeled on the Uniform Marital Property Act.
Why this matters
The marital property classification produces several distinctive estate planning implications:
Double step-up in basis at first death
Under federal Internal Revenue Code § 1014(b)(6), both halves of community/marital property receive a step-up in basis at the death of either spouse — the community property double step-up. For Wisconsin married couples, this means:
- Wisconsin couple holds $1 million of marital property stock with $200,000 basis. When one spouse dies, the entire $1 million receives a stepped-up basis to fair market value. - The same couple in Illinois (separate property state): Only the deceased spouse's half receives a step-up. The surviving spouse retains original basis on their half.
The difference can produce $80,000-$150,000 of tax savings on appreciated assets.
Equal ownership regardless of title
Unlike separate property states where titling determines ownership, Wisconsin marital property is jointly owned regardless of whose name appears on the title. This affects:
- Sale of marital property real estate. Both spouses must typically join in conveyances. - Bank accounts. Marital property funds in one spouse's name are still owned by both. - Investment accounts. Same principle applies. - Real estate. Even sole-titled real property may be marital property if acquired with marital funds during marriage.
Marital property agreements
Wis. Stat. § 766.58 allows spouses to execute marital property agreements that:
- Convert separate property to marital property - Convert marital property to separate property - Establish specific characterizations for specific assets - Direct automatic transfer at first death (similar to Washington's CPA)
Marital property agreements with non-revocable transfer provisions can substantially simplify estate planning, similar to Washington's community property agreement framework.
Out-of-state relocation considerations
For couples relocating to Wisconsin from non-community-property states:
- Property acquired before relocation may be "deferred individual property" under Wis. Stat. § 766.31(8) until reclassified. - Wisconsin recognizes "deferred marital property" for property that would have been marital if acquired in Wisconsin. - Specific characterization choices apply to property acquired before relocation.
For couples relocating from Wisconsin to non-community-property states:
- The property's marital character at the time of accrual continues for some federal tax purposes (e.g., basis step-up). - State-specific treatment of marital property after relocation varies. Some states honor the marital property characterization; others apply their own rules going forward.
What this means in practice
Wisconsin's marital property regime affects several common estate planning scenarios:
- Estate planning for married couples must account for equal ownership. Plans assuming separate-property classification will produce unexpected outcomes. - Real estate transactions during marriage typically require both spouses' joinder even when only one spouse is on the title. - The double step-up at first death is a significant tax advantage that should be deliberately preserved through proper marital property characterization. - Prenuptial agreements affecting marital property characterization must comply with Wisconsin's specific rules under § 766.58.
Comparison to other community property states
Wisconsin's marital property regime is similar to but not identical to other community property states:
- Wisconsin terminology: "marital property" / "individual property" - California, Texas, Arizona terminology: "community property" / "separate property" - Substantively similar concepts but different terminology and some procedural differences
Wisconsin's framework is also somewhat younger than other community property states (1986 vs. earlier in California, Texas). Wisconsin estate planning practice is well-established but the framework's relative newness means more residents may be unfamiliar with its implications.
What you can do about it
For married Wisconsin residents:
- Understand which property is marital and which is individual. The classification affects ownership, tax treatment, and estate planning. - Consider marital property agreements to clarify characterization or direct transfer at first death. - Coordinate real estate transactions with spousal joinder. - Capture the double step-up advantage through proper marital property characterization. - Consult a Wisconsin estate planning attorney for comprehensive planning.
For relocators to or from Wisconsin:
- Account for property characterization changes. Property may be reclassified upon relocation. - Document property origins. Records showing the source and timing of acquisitions matter. - Coordinate with new-state advisors for plans that account for prior Wisconsin marital property.
Who this affects most
Wisconsin's marital property regime is most consequential for:
- Married Wisconsin residents with property accumulated during marriage - Couples relocating to or from Wisconsin - Estate planners advising on Wisconsin-specific considerations that don't apply in non-community-property states - High-net-worth Wisconsin couples capturing the double step-up advantage
Wisconsin's distinctive position as the only Midwestern community property state produces planning considerations that out-of-state advisors may overlook. Recognition of marital property classification is essential for effective Wisconsin estate planning.