Section 138.051 - Residential mortgage loans(1) In this section: (a) "Contract rate" means the initial rate contracted to be paid on the principal of a loan from time to time.(b) "Loan" means a loan, other than a loan made by a federally chartered or state-chartered savings and loan association, secured by a first lien real estate mortgage on, or an equivalent security interest in, a one- to 4-family dwelling which the borrower uses as his or her principal place of residence and which is: 1. Made on or after April 6, 1980 and prior to November 1, 1981;2. Refinanced, renewed, extended or modified on or after April 6, 1980 and prior to November 1, 1981; or3. Made within 2 years after November 1, 1981, pursuant to a loan commitment made on or after April 6, 1980 and prior to November 1, 1981.(2) A loan may be prepaid by the borrower at any time in whole or in part without premium or penalty. Upon prepayment of a loan in full by cash, renewal or refinancing, the borrower is entitled to a refund of unearned interest charged determined as follows: (a) On a loan which is repayable in substantially equal, successive installments at approximately equal intervals of time and the face amount of which includes predetermined interest charges, the amount of such refund shall be as great a proportion of the total interest charged as the sum of the balances scheduled to be outstanding during the full installment periods commencing with the installment date nearest the date of prepayment bears to the sum of the balances scheduled to be outstanding for all installment periods of the loan.(b) On any other loan, the amount of the refund shall not be less than the difference between the interest charged and interest, at the rate contracted for, computed upon the unpaid principal balance of the loan from time to time outstanding prior to prepayment in full.(3) For purposes of computing a refund under sub. (2), interest does not include: (a) Identifiable and separately itemized charges for services incident to the loan if they are bona fide and paid to 3rd parties unrelated to the lender;(b) Fees, discounts or other sums actually imposed by government national mortgage association, federal national mortgage association, federal home loan mortgage corporation or any other governmentally sponsored or private secondary mortgage market purchaser of a loan from the original lender; and(c) A loan administration fee charged by a lender, not to exceed 2 percent of the principal amount of any construction loan and one percent of the principal amount of any other loan.(4) For the purpose of calculating the rate of interest on a loan scheduled to be paid in installments under sub. (2), the parties may agree that any installment paid within 30 days prior to or after the scheduled due date will be considered to have been paid on the due date.(5) A bank, credit union or savings bank which originates a loan and which requires an escrow to assure the payment of taxes or insurance shall pay interest on the outstanding principal balance of the escrow of not less than 5.25 percent per year. This subsection applies to any refinancing, renewal, extension or modification of the loan on or after November 1, 1981.(6) Delinquency charges on a loan shall not exceed an amount determined by application of the contract rate to the unpaid amount, including interest accrued and unpaid, until paid or maturity of the obligation, whether by acceleration or otherwise, whichever first occurs. Interest imposed after maturity may not exceed the contract rate applied to the amount due on the date of maturity.(7) This section does not apply to a loan insured, or committed to be insured, or secured by mortgage or trust deed insured by the U.S. secretary of housing and urban development, insured, guaranteed or committed to be insured or guaranteed under 38 USC 1801 to 1827 or insured or committed to be insured under 7 USC 1921 to 1995.(8) The contract rate is not subject to rate limitations imposed under this chapter or ss. 218.0101 to 218.0163 or under s. 422.201.1979 c. 168; 1981 c. 45; 1991 a. 221; 1999 a. 31.