Wis. Stat. § 70.109
Exemptions under this chapter shall be strictly construed in every instance with a presumption that the property in question is taxable, and the burden of proof is on the person who claims the exemption.
Wis. Stat. § 70.109
Exemption from payment of taxes is an act of legislative grace; the party seeking the exemption bears the burden of proving entitlement. Exemptions are only allowed to the extent the plain language of a statute permits. For tax exemptions to be valid they must be clear and express, and not extended by implication. In construing tax exemptions, courts apply a strict but reasonable construction resolving any doubts regarding the exemption in favor of taxability. United Rentals, Inc. v. City of Madison, 2007 WI App 131, 302 Wis. 2d 245, 733 N.W.2d 322, 05-1440.