The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. 13, Payment number, Payment date, Beginning balance, Scheduled payment, Extra payment, TotalThis Excel spreadsheet makes it easy to view the amortization of a home loan with optional extra monthly payments. 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. This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments.