In general, making additional payments toward mortgage principal can reduce the total interest you pay because future interest is calculated based on the outstanding loan balance. When you reduce that balance sooner, less money remains subject to interest over the remaining repayment period. The amount you save depends on your current balance, interest rate, remaining term, and how much extra you pay. Even relatively modest additional payments can change the amortization schedule when maintained over a long period. However, you should also consider your broader financial situation before directing extra cash toward the mortgage. Emergency savings, higher-interest debt, retirement contributions, and other priorities may deserve attention as well. You can use a mortgage calculator with extra payments to compare your regular schedule with an accelerated payment strategy. The calculator can help you see the potential difference in payoff time and interest cost based on your own loan numbers.