The mortgage payoff calculator helps you find out. As a result, your loan amount will increase (negatively amortize), and your loan amount will likely become larger than your original loan amount.A payoff statement is a document that shows how much money a borrower must submit to fully pay off a loan. Made in the early years of the loan. Amortization is the schedule for repayment of the loan. Want to get out of debt? Use this free mortgage calculator to estimate your monthly mortgage payments and annual amortization. Loan Repayment Terms.