Wis. Stat. § 422.417: Restrictions on security interests.

(1) With respect to a consumer credit sale a seller may take a security interest only in:

(a) The property sold;

(b) Goods upon which the property sold is installed or to which it is annexed, or goods upon which the services sold are performed, if the obligation secured is $500 or more;

(c) Real property to which the property sold is affixed, or which is maintained, repaired or improved as a result of the sale of the property or services, if the obligation secured is $1,000 or more; and

(d) Goods of the consumer which were the subject of a prior transaction with the seller which is consolidated (s. 422.206) with the consumer credit sale, or if the consumer credit sale is made pursuant to an open-end credit plan, goods previously purchased by the consumer pursuant to the plan, subject however to s. 422.418.

(2) With respect to a consumer lease, except as otherwise provided in s. 429.205 with respect to a motor vehicle consumer lease, a lessor may not take a security interest in any property owned or leased by the customer other than the leased goods to secure the lessor’s obligations under the lease. This subsection does not prohibit a security interest in a cash security deposit for a consumer lease of motor vehicles.

(3) With respect to a consumer loan, in addition to the limitations on security interests required by 12 CFR 227.13 (d), 12 CFR 535.2 (a) (4) or 16 CFR 444.2 (a) 4, if any, a lender may not take a security interest, other than a purchase money security interest, in:

(a) Clothing of the customer and the customer’s dependents and the following, if they are not fixtures: dining table and chairs, refrigerator, heating stove, cooking stove, radio, beds and bedding, couch and chairs, cooking utensils and kitchenware; or

(b) Real property if the obligation secured is less than $1,000.

(4) A violation of this section is subject to s. 425.304.