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. Biweekly payments accelerate your mortgage payoff. This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments. I'm looking for a Biweekly Loan Amortization Schedule that will allow me to input various additional payments depending on ability. This Excel spreadsheet makes it easy to view the amortization of a home loan with optional extra monthly payments.