The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. If you add an extra payment the calculator will show how many payments you saved off the original loan term and how many years that saved.Click the "File" menu and click the "New" option. 13, Payment number, Payment date, Beginning balance, Scheduled payment, Extra payment, Total Check out our loan schedule excel selection for the very best in unique or custom, handmade pieces from our templates shops. Adding extra principal payments in order to pay off the loan earlier than the loan contract calls for. In this tutorial we will add this feature. Making additional, principal-only payments can help chip away your principal in the early years of your loan. Several schedules are available for different types of spreadsheet type programs, where the amortization calculator is a ready-made template. Enter your normal mortgage information at the top of this calculator.