The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. Loan amortization schedule. 3.4, Enter values, Loan summary. Adding extra principal payments in order to pay off the loan earlier than the loan contract calls for. In this tutorial we will add this feature. Fill in the "Period" column. Fill in the column titled "Period" with your payment dates. This Excel spreadsheet makes it easy to view the amortization of a home loan with optional extra monthly payments. For both loans and grants, the expectation is that financing to complete the entire project as specified in the IRF application has been secured.