Let’s assume you make a one-time, lump-sum payment … For example, let’s assume you have $50,000 in student loans at a 7% interest rate. When you pay extra on your principal balance, you reduce the amount of your loan and save money on interest. You can use a lump sum extra payment calculator to calculate how much money you can save with a lump sum payment. Extra payment mortgage calculator with multiple extra payments and lump sum has option to export the amortization schedule with extra payments in excel or pdf format. Without recasting your mortgage, your payment stays the same as the amortization schedule is still based on the original $500,000 mortgage, but the lump sum payment allows you to … You will input these values directly under the column Extra Payment (Lump Sum) on the respective payment … Your mortgage payment is defined as your principal and interest payment in this mortgage payoff calculator. This mortgage amortization calculator with extra payments calculates your monthly payment, generates the amortization table and allows to add lump sum payments and recurring payments … The amortization table has all the details about your mortgage payments… Keep in mind that you may pay for other costs in your monthly payment, such as homeowners’ insurance, property taxes, and private mortgage … Adding Lump Sum Payments: On 13 th and 17 th periods, let’s add two lump sum payments $10,000 and $15,000 respectively. MORTGAGE AMORTIZATION CALCULATOR.