How does “Total Interest” Change with Extra Payments? Extra payments pay down your principal quicker, thereby lowering the interest charged throughout the life of the Loan. Website: https://amortizationchecker.com/ Address: 6436 Bud Bexley Pkwy, Land O' Lakes, FL 34638 Email: admin@amortizationchecker.com Phone: (601) 609-7001 Author: Zyra Velline