This Excel spreadsheet makes it easy to view the amortization of a home loan with optional extra monthly payments. Make math easier with these free calculator templates.This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments. Want to know the impact of "extra payments" on your mortgage? Check out this easy to use Excel mortgage calculator. If you want to plug in your own numbers, Click File -> Make a Copy. Please don't request edit access. 2. Interest is charged to the applicant from the date of the MELF check. 3. Loans that have emerged in the context of ESG investments.