The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. You can use the software program Excel to calculate your loan repayments.This article is a step-by-step guide to setting up loan calculations. This Microsoft Excel template illustrates how to create a loan amortization schedule, as well as dealing with additional payments and variable interest rates. Prepare an amortization schedule for the first two payments. As a result, the asset - although it is still being used - is carried on the balance sheet at its salvage value.