How auto loan payoff works
Nearly all US auto loans are simple-interest, fully amortizing loans. Interest accrues daily on the outstanding principal, and each monthly payment covers the interest since the last payment with the remainder reducing the balance. Paying early or extra reduces principal immediately, so it always saves interest.
Enter your current payoff balance, your APR and the months remaining. The calculator returns the payment required, the payoff date and the total interest left on the loan.
One caveat: a small number of older or subprime contracts use the Rule of 78s, which front-loads interest and blunts the benefit of prepaying. Check your contract if the loan predates 2010 or came from a buy-here-pay-here lender.
Why paying off a car early is usually worth it
Cars depreciate fast, and long loan terms of 72 or 84 months mean many borrowers spend years underwater — owing more than the car is worth. Paying extra pulls you above water sooner, which matters if the car is totaled or you want to sell.
Clearing the loan also frees the payment itself. A $450 monthly payment ended a year early is $5,400 back in your budget, on top of the interest saved.
Getting the extra payment applied correctly
Auto lenders are notorious for treating extra money as an advance payment, which pushes your next due date forward instead of cutting principal. Make the extra payment as a separate transaction marked principal only, and confirm on your next statement that the balance dropped by the full amount.
If your lender bills you the exact payoff quote, request it in writing — the quote is good for a set number of days and includes interest accrued to that date.
Common mistakes
Using the sticker price rather than the current balance, forgetting that a trade-in rollover from a previous loan is part of your balance, and comparing loans by monthly payment instead of total interest. A longer term always looks cheaper monthly and costs more overall.