Wis. Stat. 766.58: Prenups as Marital Property Agreements
Wisconsin treats a prenup as a marital property agreement under Wis. Stat. 766.58, and it never adopted the Uniform Premarital Agreement Act. People intending to marry may make that agreement as if already married, and it becomes effective only when the marriage takes place.
The table below summarizes the state rules that matter most before signing. The main themes are signed writing, fair and reasonable disclosure under the circumstances, voluntary execution, and the state’s separate divorce fairness review.
How Long Do You Have to Be Married in Wisconsin to Get Half of Everything?
There is no minimum. The equal-division presumption applies from the start of the marriage to everything except gifts and inheritances, including property a spouse owned before the wedding, though a court can depart from it after considering the length of the marriage.
Wisconsin is a marital property, community-style state, and divorce courts start with equal division for most property. The statute presumes all property other than certain gifts and death-related property is divided equally.
During marriage, all property of spouses is presumed to be marital property. Each spouse has a present undivided one-half interest in each item.
Divorce uses a related but separate rule. The court presumes equal division of all property subject to division, including property a spouse brought into the marriage.
That presumption can change after the court considers statutory factors. Those include the length of the marriage and the property brought to the marriage by each party.
Gifts from someone other than the spouse and property received by reason of another person’s death stay with the recipient spouse at divorce. That category includes inheritance, life insurance, survivorship property, and property bought with those funds.
The court may divide that excluded property if refusing to divide it would create a hardship. There is no minimum marriage length before the equal-division presumption applies to divisible property.
A prenup can change property classification, management, and distribution rules. It can be especially relevant when one partner enters marriage with a home, business interest, family property, or assets that may grow during the marriage.
Do Prenups Hold Up in Wisconsin?
Generally yes. The divorce court presumes a written agreement equitable, and it fails only if the challenging spouse proves one of the statutory grounds or its terms turn out inequitable at divorce.
A Wisconsin prenup can be thrown out if the spouse resisting enforcement proves one statutory ground. The burden is on the spouse against whom enforcement is sought.
One ground is that the agreement was unconscionable when made. State law treats unconscionability as a stand-alone ground with no disclosure condition attached.
Another ground is that the spouse did not execute the agreement voluntarily. Courts look at whether the signing was voluntary and free when applying the state’s divorce standards.
The third ground needs two things. Before signing, the spouse received no fair and reasonable disclosure of the other spouse’s property or debts, and also had no notice of them.
At divorce, Wis. Stat. 767.61(3)(L) says a written agreement made before or during marriage about property distribution is binding except where its terms are inequitable as to either party. The court presumes the agreement equitable as to both.
The Wisconsin Supreme Court’s Button test asks about fair and reasonable financial disclosure, voluntary and free signing, and substantive fairness. The fairness review looks at signing, and again at divorce if circumstances changed significantly in a way the couple did not contemplate.
MarriageScience’s appellate prenup study reviewed 92 U.S. appellate prenup validity disputes and found no Wisconsin appellate decision on a prenup’s validity in that period.
- A Wisconsin lawyer for one or both spouses
- Each attorney costs $799 on top of the $599 agreement
- Useful when the agreement limits maintenance or covers a business
Button and the Wisconsin Fairness Review
Prenup case law here is anchored by the Wisconsin Supreme Court’s decision in In re Marriage of Button. The case below centers on disclosure, free and voluntary signing, and fairness when the agreement is made.
Button also matters because local divorce courts may look again at substantive fairness at divorce. That later review applies when circumstances changed significantly outside what the couple contemplated.
Who Benefits Most From a Prenup in Wisconsin?
Mostly the partner who brings property into the marriage. Without an agreement, a Wisconsin court presumes an equal split of everything except gifts and inheritances, so a home, business or savings owned before the wedding goes into the pool.
Married couples here own their home more often than in most states. The Census Bureau puts the share at 88.6%, seventh highest, above Illinois and just below Minnesota, Iowa and Michigan.
The state’s median home value is $294,700, so a home bought before marriage, refinanced during marriage, or improved with marital earnings can raise classification and reimbursement questions.
Of Wisconsinites who have ever married, 20.7% have married more than once, against 23.5% nationally. Second marriages can bring children from a prior relationship, beneficiary designations and transfers at death into the agreement.
State law allows the same agreement to cover property during marriage and at death as well as at divorce. The statute permits terms on wills, trusts, nonprobate transfers, and property passing to a designated person or trust.
What a Marital Property Agreement Can Cover
A Wisconsin prenup can cover property rights and obligations in either spouse’s property whenever and wherever acquired. The statute also allows terms about management, control, and what happens at dissolution, death, or another event.
The agreement can change spousal support, subject to the state’s limits. It can also require wills, trusts, or nonprobate transfers that carry out the property plan.
Choice of law is allowed. The statute also permits any other matter affecting property, as long as it does not violate public policy or a criminal statute.
Child support is off limits. A marital property agreement may not adversely affect a child’s right to support.
Some death-transfer terms have their own divorce consequence. A term passing property at death without probate to a designated person or trust is revoked by divorce.
Section 766.58(3) Allows
- Classify property as marital property or individual property
- Set rights and obligations in property acquired before or during marriage
- Assign management and control of property
- Provide for property disposition at divorce, death, or another event
- Modify or eliminate spousal support subject to statutory limits
- Require wills or trusts to carry out the agreement
- Choose which law governs the agreement
Limits in the Statute
- Adversely affect a child’s right to support
- Leave a spouse during the marriage with less than necessary and adequate support
- Use terms that violate public policy or a criminal statute
- Prevent a court from requiring support needed to avoid public assistance eligibility at divorce or death
Maintenance Limits for Wisconsin Agreements
Wisconsin courts call post-divorce support maintenance, and there is no formula in the statute. The court may order maintenance to either party for a limited or indefinite length of time.
The default maintenance analysis includes the length of the marriage, age and health, property division, education, earning capacity, and the feasibility of becoming self-supporting at a comparable standard of living. The court also considers tax consequences and any mutual agreement made before or during the marriage.
A prenup can modify or eliminate spousal support. That power comes from Wis. Stat. 766.58(3)(d), subject to the limits in Wis. Stat. 766.58(9).
During marriage, a support modification or elimination may not leave a spouse with less than necessary and adequate support. At divorce or death, if the agreement makes one spouse eligible for public assistance, the court may require the other spouse or that spouse’s estate to provide support needed to avoid that eligibility.
A maintenance clause also faces the divorce court’s broader agreement review. Under Button, substantive fairness can be tested at signing and again at divorce if the relevant circumstances changed significantly outside the couple’s contemplation.
Signing a Marital Property Agreement
A Wisconsin prenup is validly formed as a marital property agreement when it meets the statute’s signing rule and later survives the enforceability tests. The agreement is enforceable without consideration.
One Document, Both Signatures
Wis. Stat. 766.58 requires a document signed by both spouses. Only the spouses may be parties, and there is no notary requirement.
One Lawyer, Two Lawyers or None
State law does not make separate lawyers a formal requirement. The statute also says that being represented by one shared lawyer, or one party having a lawyer and the other having none, does not by itself make the agreement unconscionable or affect enforceability.
Effective on the Wedding Day
People intending to marry may enter a marital property agreement as if they were married. The agreement becomes effective only upon marriage, so the wedding is the event that turns the premarital agreement into an operative marital property agreement.
Later Marital Property Agreements
A Wisconsin prenup can be changed after the wedding only through a later marital property agreement. Wis. Stat. 766.58(4) says amendment or revocation happens only that way.
The same statute governs agreements signed during marriage. A couple changing terms after the wedding is working with the same marital property agreement framework, often discussed as a postnup agreement.
A later agreement should still be in writing and signed by both spouses. The same enforceability concerns, including voluntary execution, fair and reasonable disclosure, and unconscionability, can matter if enforcement is later disputed.
How Much Does a Prenup Cost in Wisconsin?
Prenup cost depends mainly on attorney time and whether each partner uses separate counsel. Clio’s Legal Trends data reports a family law average here of $273 per hour, while lawyers in the state overall average $278, typically $118 to $476.
Eight hours at that rate, used here only as an example, comes to $2,184 for one lawyer. A more complex property schedule, business interest, or estate-planning tie-in can require more drafting and review time.
Online, HelloPrenup charges a flat $599 per couple for a Wisconsin agreement. Its attorney option is $799 per partner, or $1,598 for both partners, and the Attorney-Signed package is $2,197.
The platform also lists e-notarization at $50, although state law does not require notarization, and attorney Q&A at $49. MarriageScience has a separate HelloPrenup review for readers comparing online options.
| Route | Cost | What you get |
|---|---|---|
| Online prenup | $599 per couple | A Wisconsin marital property agreement with disclosure schedules and a free consultation |
| Online prenup, attorney for each partner | $2,197 per couple | Independent Wisconsin review for both spouses |
| Single attorney add-on | $799 per partner | One Wisconsin lawyer, which section 766.58(8) says does not by itself undermine the agreement |
| Hourly family lawyer | $273 per hour | Average Wisconsin family law rate. Two lawyers at eight hours each would bill $4,368, for illustration |
From Disclosure to Signature in Wisconsin
A Wisconsin prenup works best when the process follows the state’s marital property agreement rules from the start. The steps below keep the focus on signing, disclosure, and the divorce fairness review.
- List Property EarlyEach partner should identify property, debts, income, and expected obligations. The disclosure test asks whether fair and reasonable disclosure was made under the circumstances.
- Decide Property GoalsThe couple can choose how property will be classified, managed, and divided. This is where the marital property default matters most.
- Draft Written TermsThe agreement must be a written document signed by both spouses. It can cover property, support within statutory limits, death transfers, and choice of law.
- Review Support LimitsAny maintenance waiver or change should be checked against the state’s support restrictions. The agreement cannot leave a spouse during marriage with less than necessary and adequate support.
- Sign Before MarriagePeople intending to marry may sign a marital property agreement before the wedding. It becomes effective only when the marriage occurs.
- Keep Final CopiesEach spouse should keep a signed copy with financial disclosures and schedules. Those records may matter if a court later reviews voluntariness, disclosure, or fairness.
Your Wisconsin Prenup Questions
Wisconsin couples ask about the uniform act, inheritances, later changes and notaries. Each answer points to chapter 766 or chapter 767.
Is Wisconsin a UPAA state?
No. Wisconsin did not adopt the Uniform Premarital Agreement Act, and it treats a prenup as a marital property agreement under Wis. Stat. 766.58.
Can a Wisconsin prenup protect inheritance?
Yes, and divorce law already does much of the work. Inheritances and gifts from third persons stay with the spouse who received them unless excluding them would cause hardship, and an agreement can lock in how their income and growth are treated.
Can we change a Wisconsin prenup after marriage?
Yes. Wisconsin allows amendment or revocation only by a later marital property agreement signed under the same statutory framework.
Does a Wisconsin marital property agreement need a notary?
No. Section 766.58 asks for a document signed by both spouses and nothing more.
Does a prenup protect you 100% in Wisconsin?
No. A court can refuse it for unconscionability, involuntary signing or missing disclosure, can order support that keeps a spouse off public assistance, and at divorce can set aside terms that turn out inequitable.
Illinois, Minnesota and Iowa Compared
Illinois, Minnesota and Iowa all divide property by equitable distribution, and Illinois and Iowa use versions of the uniform act. Wisconsin’s marital property system is unique, so compare before you sign.
Sources
Chapters 765, 766 and 767 of the Wisconsin Statutes and the Supreme Court’s Button decision supply the rules. Census and Clio supply the numbers.
- Wis. Stat. 766.58, marital property agreements (Wisconsin Legislature)
- Wis. Stat. 766.31, classification of property (Wisconsin Legislature)
- Wis. Stat. 767.61, division of property (Wisconsin Legislature)
- Wis. Stat. 767.56, maintenance (Wisconsin Legislature)
- Wis. Stat. 765.08 and 765.12, marriage license (Wisconsin Legislature)
- In re Marriage of Button, Wisconsin Supreme Court (CourtListener)
- U.S. Census Bureau, American Community Survey 1-year estimates
- Clio Legal Trends, lawyer hourly rates in Wisconsin
- Marriage Science, Do Prenups Hold Up in Court? Appellate study
Not legal advice. This article is general information only. Prenup laws differ by state and change over time. Consult a licensed attorney in your state before acting on anything here.
