Auto Loan Payoff Calculator
Get today's payoff figure for your car loan and see exactly how much sooner an extra payment each month clears it.
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Paying off a car loan early is one of the easiest ways to save money, but two numbers are hard to get without calling your lender: what you owe today, and how much faster extra payments would finish the loan. This calculator works out both. It uses the same daily simple-interest method most US auto lenders use, so the figures line up with what your lender will quote.
How to use the auto loan payoff calculator
- Enter your loan balance after your last payment. It is on your most recent statement or in your lender’s app.
- Enter your interest rate (APR) and your current monthly payment.
- Enter any extra payment you could add each month. Use 0 to see your current schedule.
- Enter the days since your last payment to get today’s payoff amount.
The results show the payoff amount today, the per diem interest your loan is charging each day, how many months are left at your current payment and with the extra payment, and the interest you save by paying extra.
How the payoff amount is calculated
Car loans almost always charge simple interest that accrues daily on the balance you still owe. The daily charge, called per diem interest, is:
per diem = balance × APR ÷ 365
payoff amount = balance + per diem × days since your last paymentFor the months-left figures, the calculator repays the loan month by month. Each month, interest is the balance × APR ÷ 12. Your payment covers that interest first, and the rest reduces the balance. Adding an extra amount reduces the balance faster, so every following month carries less interest.
Worked example
You owe $18,000 after your last payment, at 7.5% APR, with a $450 monthly payment, and it has been 12 days since you paid.
- Per diem interest = 18,000 × 0.075 ÷ 365 = $3.70 a day.
- Payoff amount today = 18,000 + 3.70 × 12 = $18,044.38.
- At $450 a month, the loan takes 47 more months and costs $2,777.97 in interest.
- Adding $100 a month (paying $550) clears it in 37 months, 10 months sooner, and saves $576.71 in interest.
| Extra each month | Months left | Interest saved |
|---|---|---|
| $0 | 47 | — |
| $50 | 41 | $322.81 |
| $100 | 37 | $576.71 |
| $200 | 31 | $951.23 |
The savings grow with each extra dollar, but the biggest jump in months saved comes from the first $50–$100.
Tips for paying off your car loan faster
- Ask for a written payoff quote before sending a final payment. It includes the exact per diem and any fees, and is usually valid for 10 days.
- Round up your payment. Paying $500 instead of $450 is easy to forget about and still takes months off the loan.
- Put windfalls straight on the principal. Tax refunds and bonuses do the most good early in the loan, when the balance is highest.
- Check whether refinancing beats paying extra. If rates have fallen or your credit has improved, a lower APR can save more than extra payments. Compare with the auto loan refinance calculator.
Common mistakes
- Sending the statement balance as a payoff. It doesn’t include interest since your last payment, so a small balance is left over and can be reported late if you don’t notice.
- Paying extra without telling the lender how to apply it. If it goes toward next month’s payment, you skip interest savings entirely.
- Draining your emergency fund. A car loan at 5–8% is rarely worth leaving yourself without savings. Pay extra from surplus cash, not from your safety net.
- Forgetting about the title. After the final payment, the lender releases the lien. Make sure you receive the title or an electronic lien release, especially if you plan to sell the car.
Frequently asked questions
Why is my payoff amount higher than the balance on my statement?
The statement balance was correct on the day of your last payment. Interest has been building every day since then, so the payoff amount is the balance plus the per diem interest for each day that has passed. Lenders usually quote a payoff that is good for 10 days to cover the time it takes your payment to arrive.
How do I make sure extra payments reduce my principal?
Many lenders treat an overpayment as an early payment of next month's installment. Write "apply to principal" on the payment or choose the principal-only option in your lender's app, then check the next statement to confirm the balance dropped by the full extra amount.
Is it better to pay extra monthly or make one lump-sum payment?
A lump sum saves more if you have the cash now, because it stops interest on that money straight away. On an $18,000 loan at 7.5%, a one-off $2,000 payment saves about $627, while $100 extra a month saves about $577 over the life of the loan. A monthly extra is easier for most budgets.
Are there penalties for paying off a car loan early?
Most simple-interest auto loans have no prepayment penalty, but some do, and a few older contracts use the Rule of 78s, which front-loads interest and reduces the benefit of paying early. Check the "prepayment" section of your contract before you plan a payoff.
Does paying off a car loan early hurt my credit score?
It can cause a small, temporary dip because an active installment account closes, but the effect usually fades within a few months. Lower debt and a record of on-time payments matter far more.