Wis. Stat. § 74.21: Notification of payment of taxes from escrowed funds.

If a person other than the property owner pays to a taxation district or county, from an escrow account funded by the property owner, the real property taxes levied against owner-occupied residential property containing not more than 4 dwelling units, the payer annually shall send written notification of payment of real property taxes to the property owner. The notification shall be sent within 30 days after the last payment of real property taxes by the payer for any year. The notification shall state when the real property taxes were paid and the amount paid.