The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. Loan Amortization Schedule outlines the interest and principal payments owed on a mortgage, including the outstanding balance.Fill in the column titled "Period" with your payment dates. Input the month and year for the first payment loan within cell A8. This Microsoft Excel template illustrates how to create a loan amortization schedule, as well as dealing with additional payments and variable interest rates. Step 1: Set up your amortization table. Open a new Excel sheet and create input cells for the known components of your loan. 1. Download the amortization schedule from Microsoft. 2. Open the template in Excel. 3. Even-principal, straight-line loan amortization table in Excel, showing the periodic.