Wisconsin Code § 766.58

Marital property agreements
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(1) A marital
property agreement shall be a document signed by both spouses.
Only the spouses may be parties to a marital property agreement.
A marital property agreement is enforceable without
consideration.
(2) A marital property agreement may not adversely affect
the right of a child to support.
(3) Except as provided in ss. 766.15, 766.55 (4m), 766.57 (3)
and 859.18 (6), and in sub. (2), in a marital property agreement
spouses may agree with respect to any of the following:
(a) Rights in and obligations with respect to any of either or
both spouses’ property whenever and wherever acquired or
located.
(b) Management and control of any of either or both spouses’
property.
(c) Disposition of any of either or both spouses’ property
upon dissolution or death or upon the occurrence or nonoccurrence of any other event.
(d) Modification or elimination of spousal support, except as
provided in sub. (9).
(e) Making a will, trust or other arrangement to carry out the
marital property agreement.
(f) Providing that upon the death of either spouse any of either
or both spouses’ property, including after-acquired property,
passes without probate to a designated person, trust or other entity by nontestamentary disposition. Any such provision in a
marital property agreement is revoked upon dissolution of the
marriage as provided in s. 767.375 (1) . If a marital property
agreement provides for the nontestamentary disposition of property, without probate, at the death of the 2nd spouse, at any time
after the death of the first spouse the surviving spouse may
amend the marital property agreement with regard to property to
be disposed of at his or her death unless the marital property
agreement expressly provides otherwise and except to the extent

property is held in a trust expressly established under the marital
property agreement.
(g) Choice of law governing construction of the marital property agreement.
(h) Any other matter affecting either or both spouses’ property not in violation of public policy or a statute imposing a criminal penalty.
(3m) Chapter 854 applies to transfers at death under a marital
property agreement.
(4) A marital property agreement may be amended or revoked only by a later marital property agreement.
(5) Persons intending to marry each other may enter into a
marital property agreement as if married, but the marital property agreement becomes effective only upon their marriage.
(6) A marital property agreement executed before or during
marriage is not enforceable if the spouse against whom enforcement is sought proves any of the following:
(a) The marital property agreement was unconscionable
when made.
(b) That spouse did not execute the marital property agreement voluntarily.
(c) Before execution of the marital property agreement, that
spouse:
1. Did not receive fair and reasonable disclosure, under the
circumstances, of the other spouse’s property or financial obligations; and
2. Did not have notice of the other spouse’s property or financial obligations.
(7) (a) Unless the marital property agreement expressly provides otherwise, a marital property agreement that classifies a deferred employment benefit plan or an individual retirement account as marital property does not affect the operation of s.
766.62 (5).
(b) Unless the marital property agreement expressly provides
otherwise, marital property agreement that classifies as marital
property the noninsured spouse’s interest in a policy that designates the other spouse as the owner and insured does not affect
the operation of s. 766.61 (7). In this paragraph, “owner” has the
meaning given in s. 766.61 (1) (a) and “policy” has the meaning
given in s. 766.61 (1) (c).
(c) Unless the marital property agreement expressly provides
otherwise, a marital property agreement that classifies digital
property as marital property does not affect the operation of s.
766.625 (2).
(8) The issue of whether a marital property agreement is unconscionable is for the court to decide as a matter of law. In the
event that legal counsel is retained in connection with a marital
property agreement the fact that both parties are represented by
one counsel or that one party is represented by counsel and the
other party is not represented by counsel does not by itself make
a marital property agreement unconscionable or otherwise affect
its enforceability.
(9) (a) Modification or elimination of spousal support during
the marriage may not result in a spouse having less than necessary and adequate support, taking into consideration all sources
of support.
(b) If a marital property agreement modifies or eliminates
spousal support so as to make one spouse eligible for public assistance at the time of dissolution of the marriage or termination of
the marriage by death, the court may require the other spouse or
the other spouse’s estate to provide support necessary to avoid
that eligibility, notwithstanding the marital property agreement.
(10) If the spouses agree in writing to arbitrate any controversies arising under this chapter or a marital property agreement,
the arbitration agreement is enforceable under ch. 788.
(11) Married persons or persons intending to marry each
other may record a marital property agreement in the county register of deeds office under s. 59.43 (1c) (r).
(12) (a) A provision of a document signed before the determination date by spouses or unmarried persons who subsequently married each other, which provision affects the property
of either of them and is enforceable by either of them without reference to this chapter, is not affected by this chapter except as
provided otherwise in a marital property agreement made after
the determination date.
(b) If a provision or an amendment to a provision in a document described under par. (a) is intended to negate, apply or modify any right or obligation which may be acquired under 1983
Wisconsin Act 186 , 1985 Wisconsin Act 37 , or a community
property system, the provision or amendment is enforceable after
the determination date if the document was enforceable when executed or, if it is executed after April 4, 1984, either was enforceable when executed or would be enforceable if it were executed
after the determination date.
(c) This subsection does not affect a marital property agreement executed under s. 766.585.
(13) (a) With respect to a provision of a marital property
agreement that is effective upon or after dissolution of the marriage or termination of the marriage by death, any statute of limitations applicable to enforcement of the provision is tolled until
dissolution of the marriage or termination of the marriage by
death, respectively.
(b) 1. After the death of a spouse, if an estate administration
proceeding is filed, no action concerning a marital property
agreement may be brought later than 6 months after the inventory
is filed under s. 858.01. If an amended inventory is filed, the action may be brought within 6 months after the filing of the
amended inventory if the action relates to information contained
in the amended inventory that was not contained in a previous
inventory.
2. After the death of a spouse, if no estate administration proceeding is filed, no action concerning a marital property agreement may be brought later than 8 months after the death of the
spouse.
3. If an action concerning a marital property agreement is
barred under subd. 2. and an estate administration proceeding is
thereafter commenced, any judgment in an action concerning a
marital property agreement not barred under subd. 1. may be recovered only from the estate of the deceased spouse.
(c) The court may extend the 6-month period under par. (b) 1.
for cause if a motion for extension is made within the applicable
6-month period.
(14) Limitations on the effect of marital property agreements
for state income tax purposes are set forth in ch. 71.

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