120 Month Auto Loan Calculator

What a 120 month auto loan is, and who writes them

A 120 month auto loan spreads repayment across 120 monthly payments, which is ten full years. The payment stays fixed the whole time: the same amount financed, the same rate, the same dollar figure from the first payment to the hundred twentieth. What changes over that span is the mix inside each check. Interest commands the larger share at the start, and principal only becomes the bigger slice in the back half of the schedule.

These loans sit at the far edge of the market. Most banks and captive lenders stop at 72 or 84 months, and a few credit unions write new car tiers out to 96. Terms past 85 months made up 3.33 percent of new car loans and 1.40 percent of used car loans in Experian's State of the Automotive Finance Market report for the first quarter of 2026, so roughly one new car buyer in thirty signs for longer than seven years. Where a 120 month term does exist, it usually comes from a credit union, on a newer model year, with a large minimum amount financed and strict car age rules.

That scarcity is useful before you shop. A decade long car loan is not a product you compare across ten lenders. It is a niche tier, priced above the same lender's 84 month rate, and written only when the car and the borrower both clear extra hurdles.

The formula behind a ten year payment

The calculator on this page runs the standard amortization formula. The monthly payment on a loan of L dollars at an annual percentage rate of APR percent over n months is:

P = L x r x (1 + r)^n / ((1 + r)^n - 1), where r is the APR divided by 1200 and n is 120.

Dividing by 1200 does two jobs at once: it turns the yearly rate into a monthly one and the percentage into a decimal. At 7.49 percent, r is 0.0062416667. Raising (1 + r) to the 120th power gives about 2.1100, and that factor is what keeps the payment near 415 on a 35,000 loan instead of the 291.67 that ten years of straight division would suggest. The gap between those two figures is the cost of borrowing, compounded monthly for a decade.

The same formula drives the balance column. After payment number k, what remains is the present value of the payments still to come, which is why the balance falls slowly at first and then faster. A lender uses the same math for a payoff quote on the day you sell or trade the car.

The table below shows where the money stands at the end of each year of a 35,000 loan at 7.49 percent. The balance barely moves in year one even though 4,986 of payments leave the account.

Only 31 percent of the balance is gone after 36 payments, and the halfway point arrives in month 76. That shape is not a flaw in the math. It is what a ten year term does to the interest share of each check.

Worked example: 35,000 financed for a decade

Take a 35,000 amount financed at 7.49 percent APR, close to what credit unions advertise on long tier terms. Over 120 months the payment is 415.27. Multiply by 120 and the total of payments is 49,832.83, so the interest for the decade is 14,832.83, or 42.4 percent of the amount borrowed.

The early years go mostly to interest. The first 12 payments carry 2,538.71 of it while principal falls from 35,000 to 32,555.43. After 24 payments the balance is 29,921.34. After 60 payments, halfway through the count and five years into ownership, 20,729.27 is still owed, and 10,645.68 of interest has already been paid, which is 71.8 percent of the total. Principal retirement only speeds up in the final third of the schedule, long after the factory warranty has expired.

Scale the example to your own number: each 1,000 borrowed costs 11.86 a month at this rate and term, so a 50,000 amount financed prices at about 593.25 before tax, title and registration.

The price of the last three years: five terms compared

Dealers sell the monthly figure, and the Consumer Financial Protection Bureau's guide to comparing auto loan offers tells buyers to look at the APR, the term and the total instead. Run that comparison on the 35,000 loan at 7.49 percent and the trade becomes a set of numbers:

Read the last column as the price of each stretch. Moving from 84 to 120 months lowers the payment by 121.40 and adds 4,752.81 of interest. That trade can be rational when cash flow is tight for a year or two, but it should be a decision made with the number in front of you, not a reflex to the smaller line on the paperwork.

Notice the shape of the table as well. The payment falls by 96.18 going from 60 to 72 months, by 68.31 from 72 to 84, by 50.91 from 84 to 96, and by 35.25 for each of the last two years. Every added year buys less payment relief than the one before it, while the interest column keeps climbing. The last year is the worst trade in the table.

Interest is front loaded, and ten years stretches that

Interest is charged on the remaining balance, so it concentrates at the front of an amortizing loan. The first year of this loan carries 2,538.71 of interest, the second 2,349.19, the third 2,144.99, and the yearly bill keeps sliding until the final year costs a few hundred dollars. Across the decade, 71.8 percent of all interest is paid by month 60.

Extra principal attacks that front-loaded cost directly. Adding 100 a month takes the payoff from month 120 to month 89 and drops interest to 10,678.05, a saving of 4,154.78. Nothing else in the loan changes: same rate, same lender, same car. The only difference is that each extra dollar retires balance before the next month's interest is calculated, so an extra dollar in year one avoids more interest than the same dollar in year nine.

The effect is large enough to reframe the term decision. A borrower who takes 120 months for flexibility and pays 100 extra from the start ends up with a loan that behaves like a 89 month loan, while keeping the right to drop back to 415.27 in a tight month. That optionality is the one genuine argument for the longer loan, and it only pays off if the added payments happen.

Negative equity over a ten year horizon

Negative equity means owing more than the car would bring on a sale, and the CFPB notes that a longer term extends the period when that is likely. Kelley Blue Book's depreciation guide puts the typical first year loss near 20 percent of the purchase price and the five year loss near 55 to 60 percent. Set the 35,000 example against a curve in that range and the gap is easy to see:

The value column is an illustration, not a quote: it applies a 20 percent first year drop and then roughly 10 to 12 percent a year, which is the pattern Kelley Blue Book describes for a typical model. A truck or a limited production car can hold value better; a luxury sedan or an electric car with a tired battery pack can do worse.

What the table shows is the shape of the risk. The gap widens for about five years, peaks above 6,000, and only closes near year eight. During that stretch a trade in, a total loss or a move to a cheaper car all mean writing a check to close the loan, and gap insurance covers less than most buyers assume.

Gap insurance exists for exactly this window. When an insurer settles a total loss, the payout tracks the car's cash value, not the loan balance, and the deductible comes off the top; whatever the settlement leaves outstanding is money the borrower still owes. On a ten year schedule the insurer's number and the lender's number diverge for years, so a policy that covers the gap, often a few hundred dollars over the term, belongs in the comparison alongside the loan itself.

Four moves that cut the cost of a decade long loan

Four moves shrink the cost of a ten year loan, and they stack:

• More down payment. Every 1,000 put down removes 11.86 from the payment and about 424 from the interest bill at this rate, because the loan starts smaller and every month of interest is charged on a smaller balance.
• A shorter term. The 84 month version of this loan costs 121.40 more a month and 4,752.81 less in interest. If the budget allows it, the shorter loan wins on total cost every time.
• Extra principal from month one. The 100 a month example above ends the loan at month 89 and saves 4,154.78, with no refinancing and no new paperwork.
• A refinance later. a decade long loan leaves a long window of rate exposure. If rates fall or your credit improves, refinancing the remaining balance at a shorter term resets the clock and usually cuts the rate.

One cost sits outside the loan and deserves the same attention. Fuel over ten years often exceeds the interest bill, and fueleconomy.gov publishes combined MPG for every model year, which lets you price that part of ownership before you sign rather than after. Insurance, tires and maintenance follow the same logic: they run for the whole term, not just until the warranty ends.

When a 120 month car loan can make sense

Three situations give a 120 month term a defensible case. The first is a car that holds value: a limited production truck, a collector model, or a specialty car with a documented resale record. When the asset depreciates slower than the loan amortizes, the negative equity problem shrinks and the long term becomes a lending choice rather than a trap.

The second is a large down payment paired with a plan to pay ahead. A buyer who finances 20,000 against a 45,000 car and pays 200 extra a month keeps a low required payment as insurance against a bad quarter while retiring the balance years early. The math in the previous section is the whole argument: the extra payment does the work, and the long term supplies flexibility.

The third is a smaller car on a long loan instead of a bigger car on a short one. When the choice is a 60 month loan on a 45,000 car or a 120 month loan on a 28,000 car, the cheaper car usually wins on total cost, insurance and depreciation, even though its term is longer.

The case against remains the default. A ten year commitment outlasts the warranty, spans at least one major repair cycle, and keeps a payment alive long after most owners would have traded. When the payment only fits at 120 months and no extra principal is realistic, the honest read is that the car is more than the budget supports, and a less expensive car on a 60 month loan will cost less in total at the same rate.