Abstract: A method and system of implementing a loan in a billing system includes memory storing information relating to the loan, the information including a principal balance of the loan, a term of the loan, and an interest rate of the loan. A prepayment amount that is a portion of the principal balance of the loan is selected. A present value of the prepayment amount is determined and a discount amount is selected. A discounted prepayment amount is determined based on the prepayment amount and the present value of the prepayment amount. The discount amount may be less than, equal to or greater than the difference between the prepayment amount and the present value of the prepayment amount. The discount amount may be greater than the difference, for example, for promotional purposes.