Car Loan Payoff Calculator

Find out when your car loan will actually be finished, and what the extra payments are worth. Enter the balance you owe, the rate and what you pay each month, then add a monthly extra or a one-off lump sum to see how many months and how much interest it removes.

It Simulates the Loan Rather Than Solving a Formula

A payoff date has no closed-form answer once extra payments enter the picture, because the monthly split between interest and principal changes every month. So the page does not use a formula. It walks the loan forward one month at a time, charging interest on whatever is still owed, subtracting the payment, and repeating until the balance reaches zero. That is the same procedure a bank's amortisation schedule follows, and it handles irregular payments for free.

• Interest for a month is the outstanding balance multiplied by the annual rate divided by twelve. Nothing is compounded daily and no fees are assumed.
• The payment reduces the balance only after that month's interest has been added, which is why an early payment attacks far more principal than a late one.
• A lump sum is taken off the balance before the schedule begins, so it saves interest from the very first month.
• The loop stops either when the balance reaches zero or after 600 months, whichever comes first. That ceiling is not academic — see the case below where a payment smaller than the monthly interest never clears the loan.

Reading the Payoff Result

1. Enter the current balance, not the original loan amount. If you have been paying for two years, the balance is what remains today and that is what the calculation needs.
2. Enter the annual percentage rate as it appears on your statement. A rate quoted as 6.5 percent is entered as 6.5, not 0.065.
3. Enter your regular monthly payment, then add an extra amount in the separate field if you want to test one. Keeping the two apart lets you see the effect of the extra on its own.
4. Add a lump sum if you are about to make one. Setting it to zero is the baseline case.
5. Choose monthly or biweekly and read the result, which gives the payoff in years and months together with total interest and total paid.

What Extra Payments Are Worth on a Typical Balance

Take 20,000 owed at 6.5 percent. Paying 400 a month with a 100 monthly extra, the page returns three years and ten months, with 2,602.47 in interest. The interesting comparison is what the two components contribute.

• The same 500 a month made up entirely of the regular payment produces an identical result, which makes sense: the schedule only sees the total. Splitting the field into payment plus extra changes nothing about the arithmetic and everything about how easy it is to test a decision.
• Switching the same 500 to biweekly returns three years and ten months as well, but interest falls slightly to 2,571.84. The reason is timing rather than amount. Two half-payments a month mean the first half lands earlier in the month, so the average balance over the month is marginally lower.
• The saving from that timing effect is about 30 dollars over the life of this loan. It is a real saving but a small one, and it is worth knowing that this is not the classic biweekly trick that adds an extra payment each year.
• Adding a lump sum is the lever with the largest effect per dollar, because it removes interest from every month that follows it rather than from one.

The Case Where the Loan Never Ends

There is a threshold that is easy to cross without noticing. If your payment is smaller than the interest charged each month, the balance grows instead of shrinking and no amount of patience will clear it. The page reveals this honestly rather than hiding it.

• On a 20,000 balance at 6.5 percent, the monthly interest alone is about 108.33. A payment of 100 is below that line.
• Enter 100 and the calculation runs until it hits the 600-month ceiling and reports 50 years and 0 months, with 97,792.52 of interest. The result is not a payoff date at all — it is the ceiling showing through.
• If you see exactly 50 years, treat it as a signal that the payment does not service the debt, not as a long-term projection.
• The same thing happens in miniature with any payment close to the interest line: the schedule becomes extremely long, and almost everything you pay is interest. Raising the payment by even a small amount has an outsized effect, which is the single most useful thing this page can show you.

What Else Reduces the Interest You Pay

Alternative	Notes
Refinancing at a lower rate	Attacks every remaining month at once. For a loan with several years left, a two-point reduction usually beats what most people can afford to add in extra payments.
Shorter original term	A five-year loan instead of six carries a higher payment but a materially lower rate in most markets, because the lender's risk window is shorter. The total interest difference is larger than the payment difference suggests.
Larger down payment	Decided before you sign, and it removes interest from the entire life of the loan rather than from the tail. This is why it is the most efficient dollar you can put into a car purchase.
Attacking the highest rate first	If you have several debts, extra money does the most work against the highest rate. A car loan at 6.5 percent is usually a better target than a mortgage at half that rate.

Payoff Questions

Is the biweekly option the same as making 26 payments a year?

No, and the distinction matters. The classic biweekly plan halves your monthly payment and collects it every two weeks, which produces 26 half-payments — the equivalent of 13 full monthly payments a year — and shortens the loan substantially. This page instead splits your payment into two halves within each month, so the annual total is unchanged. The saving you see comes only from paying slightly earlier within each month.

Why is the final payment smaller than the others?

Because the page pays off whatever balance remains rather than demanding a fixed instalment. The final month's payment is capped at the outstanding balance plus that month's interest, so it is usually less than the regular amount. On a long schedule the difference is a few dollars, but it is why the reported total is not simply the payment multiplied by the number of months.

Does this include early repayment penalties or fees?

No. The simulation models interest and payments only. Many car loans do carry a prepayment penalty or a per-payment fee, and where that exists it can cancel out the benefit of paying early. Check your agreement before acting on any of these figures.

Does the balance include my next payment?

Use the balance from your most recent statement and leave it at that. The one-month offset either way changes the answer by a few dollars of interest, which is far smaller than the uncertainty in the rate and the payment itself.

Last verified: October 3, 2026

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Maintained by Huang Bin · Last updated October 3, 2026