Each line shows how much you still owe as the months pass. Shorter loans reach $0 sooner. Hover to see the balance and interest paid so far for all three.
Each line shows the interest you have paid so far as the months pass. Longer loans keep climbing and end higher — that is the extra cost of a smaller monthly payment.
Dealers often focus on the monthly payment. A lower monthly payment can make a car feel more affordable, and that matters for your budget.
But a longer loan usually means more total interest. You pay a little less each month for many more months, so the car ends up costing more overall.
Before choosing a loan, compare both numbers: the monthly payment and the total interest. Pick the term on purpose, knowing what the car really costs.
If you can, make a larger down payment. That shrinks the loan, which lowers both the monthly payment and the total interest.
A larger down payment might be hard to do, so remember that you can always make extra payments to shorten the term of any of these loans. If you do get the longer-term loan, extra payments still let you reduce the total interest you pay.
What is a car loan?
A car loan (also called an auto loan) is money a lender gives you to buy a car. You pay it back in equal monthly payments over a set number of months, called the term. Each payment is split between interest, the cost of borrowing, and principal, the part that actually pays down what you owe.
Principal vs. interest
The principal is the amount you borrowed. The interest is what the lender charges you to borrow it. On a $40,500 loan at about 7%, you do not just pay back $40,500 — you pay back the principal plus several thousand dollars of interest spread across every payment.
Early in the loan, most of each payment goes to interest because the balance is still large. As the balance shrinks, more of each payment goes to principal. That is why a shorter loan, which keeps the balance high for less time, costs less interest overall.
APR and the monthly rate
APR stands for annual percentage rate — the yearly cost of the loan as a percent. To find the monthly rate, divide the APR by 12. An APR of 7.25% becomes a monthly rate of about 0.604%. That small number, charged on a large balance every month for years, is where total interest comes from.
Why a longer loan costs more
Stretching the same loan over more months does two things. It splits the principal into more pieces, so each payment is smaller, and it keeps your balance higher for longer, so interest keeps building month after month. Even at the same APR, more months means more total interest. Longer car loans often also carry a slightly higher APR, which adds even more.
Your credit score sets your APR
Lenders use your credit score to decide your rate. A strong score can lower your APR by several points, and on a 72-month loan that difference is worth thousands of dollars. The APR boxes on this page let you model different rates, but in real life the rate is mostly earned through your credit history.
Key takeaway
The monthly payment tells you what the loan does to your budget; the total interest tells you what the car really costs. A shorter term and a bigger down payment both lower the total cost, and extra payments can do the same on a loan you already have. Look past the monthly number and choose the term on purpose.
Last minute additions
The amount you finance is often larger than the car's sticker price. Sales tax, dealer fees, gap insurance, and extended warranties can all be added to the loan at the last minute. The biggest trap is negative equity — if you still owe money on a trade-in, that leftover balance can be rolled into the new loan, so you start the new car already owing more than it is worth.
Shop the financing, not just the car
It helps to get pre-approved for a loan at your own bank or credit union before visiting a dealer. That gives you a baseline rate to compare against. Dealer financing can be convenient, but the rate is sometimes marked up, so treat the car's price and the loan as two separate negotiations.
0% APR vs. cash rebate
Promotions often make you choose between a 0% APR offer and a cash rebate — you usually cannot take both. A rebate lowers the amount you finance, which sometimes beats 0% once you do the math. Run the car price minus the rebate at a normal rate against the full price at 0%, and pick the lower total cost.
Negotiating an extended warranty
Dealers push extended warranties hard because they are high profit, which also means the price is negotiable. If you decide a warranty is right for you, negotiate it up front with the salesperson, before you reach the finance office.
Ask for the warranty at dealer cost — typically about 50% of the sticker price — as a condition of buying the car. Dealers will often agree to sell the car, especially if you live within their service area.