Extra payments can significantly reduce the lifespan of a loan. Use Flagstar Bank's extra payment calculator to find the right payment structure for you.This financial calculator helps you find out. View the report to see a complete amortization payment schedule, and how much you can save on your loan! Enter your mortgage details here. Enter extra payment amount in relevant month rows. A payoff letter shows the remaining balance on your mortgage, including fees, interest, etc. Learn more about what a payoff quote is and how to request one. Use this calculator to see how making extra payments affects how soon you can pay off your mortgage and how much interest you pay on your home loan. This guide will help you learn mortgage math, allowing you to confidently calculate how much you need to pay off your mortgage.