You pay almost all interest in the first few years otherwise. It's the same as minimum payments on credit cards.NerdWallet's early mortgage payoff calculator figures out how much more to pay. We used a service called Plastiq to pay our mortgage off. Enter your normal mortgage information at the top of this calculator. You can optionally add your other homeownership expenses in the middle section. Early loan payback can potentially shorten your credit history and decrease your credit mix, which can both have a minor negative impact on your credit score. Use the money transfer option and overpay the mortgage that way.