Wis. Stat. § 177.0203: When other tax-deferred account presumed abandoned.

Subject to s. 177.0210, and except for property described under s. 177.0202 and property held in a plan described in section 529A of the Internal Revenue Code, property held in an account or plan, including a health savings account, that qualifies for federal income tax deferral under the Internal Revenue Code is presumed abandoned if it is unclaimed by the apparent owner 3 years after the earliest of the following:

(1) The date specified under the Internal Revenue Code or by federal regulation by which the distribution of property must begin in order to avoid a penalty, if no such distribution has been made.

(2) Thirty years after the date on which the account was opened.