Early Payoff Calculator

Standard amortization is derived from loan amount, rate and term through the classic amortizing formula that splits each payment into interest on the remaining balance and principal reduction. Adding a fixed extra monthly amount redirects entirely to principal, so the balance falls faster and each subsequent month accrues less interest — a compounding benefit that saves more interest dollars per extra dollar early than late. The calculator simulates this month-by-month, subtracting regular payment plus extra from the interest-augmented balance until zero, yielding new payoff term, months saved and interest avoided.

Extra payments accelerate most when applied early and consistently; lump sums at inception often beat staggered extras even when totals are equal. Compare the interest saved against expected investment return at your risk tolerance — when the loan rate exceeds reliable after-tax returns, early payoff is frequently the higher-return, lower-risk use of surplus cash.