A 15-year car loan stretches your payments over 180 months instead of the typical 60 to 72 months, which lowers what you pay each month but costs you significantly more in interest
When you borrow money to buy a car, the lender sets a term — the number of months you have to pay it back. A standard car loan runs 60 months (5 years) or 72 months (6 years). A 15-year loan is 180 months, which means your monthly payment drops because you are spreading the same debt across many more payments. However, the longer you borrow, the more interest you pay overall, and you carry a car loan into years when the vehicle itself may no longer run reliably.
Most lenders do not offer 15-year terms as a standard product. If you see one advertised, it is usually a subprime lender — a company that specializes in borrowers with poor credit or no credit history. These lenders charge higher interest rates to offset the risk they take. A 15-year term from a subprime lender can cost you thousands more than a shorter loan from a traditional bank or credit union, even though your monthly payment looks smaller.
Key Takeaways
- A 15-year car loan lowers your monthly payment but increases the total interest you pay, sometimes by $5,000 to $10,000 or more depending on the loan amount and interest rate.
- Most 15-year car loans come from subprime lenders who charge higher interest rates than banks or credit unions, making the total cost even higher.
- You will likely owe more than the car is worth for most of the loan term, which creates a problem if the car breaks down or is totaled in an accident.
- A shorter loan term or a larger down payment reduces your total interest cost and gets you out of debt faster.
How a 15-year term changes your monthly payment and total cost
The monthly payment on a car loan depends on three things: the amount you borrow, the interest rate, and the length of the loan. A longer term spreads the principal (the amount borrowed) across more months, so each payment is smaller. But interest accrues on the unpaid balance every month, so a longer loan means more months of interest charges.
For example, if you borrow $20,000 at 8 percent interest, a 60-month loan costs about $1,860 per month and $111,600 total (principal plus interest). The same $20,000 at 8 percent over 180 months costs about $593 per month but $106,740 total — that is $16,140 in interest instead of $11,600. The monthly payment is lower, but you pay $4,540 more overall. If the interest rate is higher (which is common with subprime lenders), the difference is even steeper. At 15 percent interest over 180 months, the same $20,000 loan costs about $710 per month and $127,800 total — that is $27,800 in interest alone.
These numbers shift based on the actual loan amount, your credit score, and the lender's rates. The point is that a longer term always costs more in total interest, even though the monthly payment feels more manageable.
Being underwater on a 15-year loan
Underwater (or upside down) means you owe more on the loan than the car is worth. With a 15-year term, you are underwater for most of the loan because cars lose value quickly in the first few years, while your loan balance drops slowly.
A new car loses about 20 percent of its value in the first year and 50 percent by year five. If you finance a $25,000 car over 15 years, after five years the car might be worth $12,500, but you could still owe $18,000 or more. If the car breaks down and costs $4,000 to repair, you have to decide whether to pay for repairs on a car you are deeply underwater on. If the car is totaled in an accident, your insurance payout covers only what the car is worth, not what you owe — you still have to pay the difference out of pocket.
A shorter loan term gets you out of the underwater zone faster. With a 60-month loan on the same $25,000 car, you would owe less than the car is worth by year three or four, which gives you more flexibility if something goes wrong.
Subprime lenders and the real cost of a 15-year loan
Banks and credit unions rarely offer 15-year car loans because the risk is too high — the car depreciates faster than the loan balance shrinks, and borrowers are more likely to default on very long terms. Subprime lenders, by contrast, specialize in long-term loans to borrowers with low credit scores or limited credit history.
Subprime lenders charge interest rates that can range from 12 to 29 percent, depending on your credit score and the lender. They also add fees: documentation fees, dealer fees, extended warranty costs, and GPS tracking devices (which they can disable if you miss a payment). These fees are often rolled into the loan amount, so you pay interest on them too. A $20,000 car can become a $24,000 loan after fees, and at 18 percent interest over 180 months, that costs about $8,640 in interest alone.
Some subprime lenders use starter interrupt devices — technology that disables your car if you miss a payment. This is legal in many states, but it means you could lose access to your car without warning, which can cost you your job or make it impossible to get to medical appointments.
Alternatives to a 15-year car loan
If you are considering a 15-year loan because the monthly payment is the only thing you can afford, there are other routes that cost less overall.
Buy a less expensive car. A $15,000 car financed over 60 months at 10 percent costs about $318 per month. A $25,000 car over 180 months at 15 percent costs about $710 per month. The cheaper car is more affordable month to month and costs far less in total interest. Used cars from reliable brands (Honda, Toyota, Mazda) often run well for 100,000 miles or more and cost less upfront than newer models.
Save for a larger down payment. The more you put down, the less you have to borrow. Putting down $5,000 instead of $1,000 on a $20,000 car reduces your loan amount by $4,000, which saves you thousands in interest over any loan term. Even a few months of saving can make a real difference.
Work with a credit union instead of a subprime lender. Credit unions typically offer lower interest rates than subprime lenders, even to borrowers with poor credit. If you are not already a member, you may be able to join through your employer, a community organization, or your school. A credit union loan at 10 percent over 72 months is almost always cheaper than a subprime loan at 18 percent over 180 months.
Delay the purchase. If you can wait three to six months, you can work on improving your credit score by paying down existing debt or correcting errors on your credit report. A higher credit score qualifies you for lower interest rates, which saves you money on any loan term you choose.
What to watch for if you are offered a 15-year loan
If a dealer or lender offers you a 15-year term, ask specific questions before you sign. Request the total amount you will pay over the life of the loan, not just the monthly payment. Ask whether the loan includes fees, and if so, what they are and whether they are rolled into the loan amount. Find out whether the lender uses a starter interrupt device and under what circumstances it activates.
Read the contract carefully before signing. Look for clauses about early payoff penalties (some lenders charge a fee if you pay off the loan early), gap insurance (which covers the difference between what you owe and what the car is worth if it is totaled), and what happens if you miss a payment. Do not sign anything you do not understand, and do not let a dealer rush you.
If you have the option, get the loan pre-approved through a bank or credit union before you go to the dealership. This gives you a clear picture of what you can afford and what interest rate you may have access to for, and it puts you in a stronger position to negotiate.
Frequently Asked Questions
Can I pay off a 15-year car loan early without a penalty?
Many loans allow early payoff, but some subprime lenders charge a prepayment penalty. Check your contract or ask the lender directly before you sign. If there is no penalty, paying extra toward the principal each month can cut years off the loan and save thousands in interest.
What is gap insurance and do I need it on a 15-year loan?
Gap insurance covers the difference between what your car is worth and what you still owe if the car is totaled. On a 15-year loan, you are underwater for most of the term, so gap insurance protects you if an accident happens. Some lenders include it; others charge extra. It is worth the cost if you are financing a long-term loan.
Will a 15-year car loan hurt my credit score?
Taking out any loan affects your credit score temporarily, but a 15-year loan is not inherently worse than a shorter one. What matters is whether you make payments on time. Missing payments or defaulting will damage your score significantly, and subprime lenders report to credit bureaus just like traditional lenders do.
What happens if I can't afford the monthly payment on a 15-year loan?
Contact your lender when ready if you think you will miss a payment. Some lenders offer forbearance (temporarily lower payments) or loan modification. Do not ignore the problem — if you default, the lender can repossess the car, and you may still owe the difference between what the car sells for and what you owe.