Auto Refinance Savings Calculator

The two loans are both standard amortization schedules

Both the current loan and the replacement are run through the same amortization calculation as the site’s other loan pages: fixed monthly payment, interest charged each month on the balance, principal shrinking against it. The current loan keeps its existing rate and remaining term; the replacement restarts a fresh term at the new rate.

The monthly saving is the new payment minus the current payment. The lifetime saving compares the total interest of the current schedule with the total interest of the new one - plus the fees, which are as much a part of the refinance price as the rate is.

The break-even point answers "is it worth the fees"

Fees are paid up front because the saving arrives one month at a time. The break-even month is the fee divided by the monthly saving: after that point, the refinance has paid for itself and starts keeping money. If the monthly saving is near zero, the break-even stretches far enough that the fees may never be worth it, and the page says so instead of hiding it.

The break-even is only meaningful if the loan outlives it. If you plan to sell the car, trade it in or pay it off before the fee is recovered, the refinance never gets a chance to keep money, and the same fee that looked fine over five years becomes pure loss.

What the page cannot know

It cannot know the terms of the loan you would actually sign - the rate depends on credit, the loan-to-value on the car, and both are quoted, not promised. It also assumes no prepayment penalty on the current loan and no change in insurance or registration; those are costs of switching that sit outside the amortization and belong in the fees if your lender charges them.

It also runs the new loan as a fresh amortization schedule at the rate and term you enter. Any lender that folds a higher rate into its fee structure, or advertises a teaser rate that resets later, will produce a number this page cannot anticipate - which is why the actual quote you hold, not the advertised rate, is the right input.

Read the break-even before the payment drop

The monthly saving is printed to the cent, but the number to weigh first is the break-even: the fee divided by the saving. On the same-term example, a $500 fee against a $28 monthly saving takes roughly 18 months to earn back, and any break-even that reaches past the term you will actually keep stops being worth paying. Longer terms can cut the payment while adding interest back, which is why the comparison shows totals, not just the new payment.

Same term first, then the payment

The cleanest comparison keeps the term identical and changes only the rate, because that isolates what the refinance actually buys. Once the new term is allowed to stretch, a lower payment can come from the extra months rather than from the rate, and the lifetime column is where that shows up.

Read the printed rows in that order: monthly change first, total interest second, fees earned back third. If the break-even lands beyond the time you expect to keep the car, the refinance is a bet on holding it longer than your current plan rather than a saving you can bank.

The new schedule is a fresh set of payments, so every month of the new loan is a month you are not paying the old one. That is the other half of the term question: a five-year refinance on a car you will sell in three means paying fees to shorten a loan you were going to end anyway.