To add a monthly escrow amount to the loan amortization schedule in Excel, you can follow these steps: Insert a new row below the last payment row. Microsoft Excel Mortgage Caculator XLS Worksheet.This spreadsheet is an allinone home mortgage calculator. It lets you analyze a fixed or variable rate home mortgage. This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments. Mortgage amortization is the process of paying down your mortgage over the course of your term. An amortization schedule shows how those payments are applied. This finance video tutorial explains how to create an amortization table in excel. Use our amortization calculator, type in a dollar figure under "Loan amount. Mortgage Payment Calculator.