The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. This Microsoft Excel template illustrates how to create a loan amortization schedule, as well as dealing with additional payments and variable interest rates.Fill in the column titled "Period" with your payment dates. Input the month and year for the first payment loan within cell A8. Loan Amortization Schedule outlines the interest and principal payments owed on a mortgage, including the outstanding balance. In this trick we want to see an amortization table with a variable rate. Step 1: Set up your amortization table. Open a new Excel sheet and create input cells for the known components of your loan. : formula in Excel : =PMT(Effective Annual Rate, Amortization Months, -Opening Balance,0,0). For your convenience, we publish local North Las Vegas mortgage rates below to help you see currently available rates. 3.