Mortgage Payoff Calculator for Extra Payment Savings

The mortgage payoff calculator estimates how quickly a current home loan can be retired if you add extra principal. Homeowners use it after a raise, a bonus, or a decision to stop carrying a mortgage into retirement. Enter the current balance, annual rate, the principal-and-interest payment you already make, the extra amount, and whether that extra is monthly, biweekly, or annual. Remaining term is a reference field; payoff is simulated from the balance and payment, not from the original maturity date. Each month the balance accrues interest at r/12. The scheduled payment plus the monthly equivalent of extras is applied to interest first, then principal. A monthly extra adds dollar-for-dollar. A biweekly extra of $200 is converted with 26/12, or about $433.33 per month. An annual extra is spread over 12 months, so $2,400 per year equals $200 per month. Interest savings equal total interest on the current payment path minus total interest on the accelerated path. New payoff time and term reduction are reported in years with one decimal place. Use the mortgage payoff calculator before sending a large principal draft, when choosing between a modest monthly extra and an annual lump sum of the same yearly total, and when checking whether the extra still leaves an emergency reserve. Prepayment penalties, recast fees, and lost investment returns are not included. If the extra cash would otherwise pay a higher-rate credit card, that card may be the better first target. Keep the extra amount at a level you can sustain after taxes, savings, and other debt, because stopping extras later gives back some of the projected savings. The simulation stops at 1,200 months. Escrow for taxes and insurance should not be included in the payment field because those amounts do not reduce principal. Servicer rounding and per-diem interest on a payoff quote can differ by days. Recalculate after a refinance, and confirm extras are coded as principal reduction rather than as a prepaid monthly draft.