How it works
When paying off a car loan early helps
Paying extra on an auto loan can reduce interest and shorten the time until the car is fully paid off. The savings are usually strongest when the loan has a higher APR, a larger remaining balance, or many months left in the term.
This calculator compares your regular payment with a larger payment that includes an extra monthly amount. It estimates months saved, interest saved, the new payoff date, and a balance reduction chart.
Before paying extra, check whether your lender applies extra payments to principal and whether the loan has any prepayment penalty. Many auto loans allow early payoff, but payment rules can vary. You may need to tell the lender that the extra amount should reduce principal rather than simply advance the next due date.
Early payoff is useful when it reduces interest without harming your emergency fund or higher-priority debt payoff. If you also carry high-APR credit card debt, compare the interest rates before deciding where extra cash should go first.
What the savings comparison assumes
The standard path uses your entered monthly payment. The accelerated path uses that payment plus the same extra amount every month. Both start with the current outstanding balance and accrue estimated interest before each payment. The comparison shows the difference in payoff months and total interest.
For the closest estimate, use the rate that actually accrues on the outstanding principal. A loan's disclosed APR may include fees and differ from its note rate. This tool does not separately calculate daily accrual, title fees, prepayment penalties, or precomputed-interest rebates.
For example, $10,000 at 6% has $50 of modeled interest in the first month. Any part of the payment above that amount reduces principal, leaving a smaller base for the following month. Confirm the lender applies additional money as intended. For a final payment, request a payoff quote valid for the date the funds will arrive.
Sources and calculation notes
Our numerical examples use the monthly model described in our methodology. For account rules and terminology, see:
Content updated September 21, 2026. Examples are illustrations, not lender offers or account-specific payoff quotes.