How Do Car Loans Work? Your Guide to Auto Financing

Car loans let you spread the cost of a vehicle over time instead of paying the full price upfront. A lender covers the purchase, and you repay it in monthly installments, plus interest, over a set term. How you structure that loan determines what the car costs you over the life of the loan.

Unfortunately, borrowing is getting more expensive. The average new car loan is nearly $10,000 higher than at the start of the pandemic in March 2020, and used car loans are up almost $6,000 over the same period. Monthly payments have climbed along with them, now averaging $770 for new vehicles and $531 for used ones.

With that much money on the line, let's answer the question, "How do car loans work?" so you can make an informed decision about your auto loan.

A car loan is an installment loan used to buy a new or used vehicle. The lender, such as a bank, credit union, or finance company, pays the dealer or seller for the car.

Car loans are secured loans, meaning the vehicle serves as collateral. If you fail to make payments as scheduled, the lender can repossess the car. That security is also why car loans usually have lower interest rates than unsecured personal loans.

To better understand how auto financing works, it helps to understand these common car loan terms:

• Interest rate: The cost of borrowing the money, expressed as a percentage of your loan amount.
• Annual percentage rate (APR): Your interest rate plus lender fees, such as origination charges. Because it captures the full cost of the loan, the APR is the best number for comparing offers.
• Loan term: How long you have to repay the loan, usually expressed in months.
• Amortization: How each payment is split between interest and principal. Early payments go mostly toward interest; later ones mostly pay down the balance.

Lenders structure car loans so you repay the balance in equal monthly installments over the loan term. Each payment covers that month's interest first, and the remainder goes toward your principal.

Three factors determine your payment amount:

1. How much you borrow
2. Your APR
3. Your loan term

For example, a $30,000 loan at 7% APR costs about $594 a month on a 60-month term, with roughly $5,640 in total interest.

How Much Car Can You Afford?

Before you settle on a car payment, work out how much car you can afford. Daniel Maura, an IRS enrolled agent and the CEO and founder of Sevfin, an accounting and tax advisory firm, recommends first separating needs from wants, then checking where the payment fits within your budget.

Your credit score is the biggest driver of your auto loan rate. In Q1 2026, average new-car loan rates ranged from 4.55% for super-prime borrowers to 16.01% for deep subprime borrowers. Used car rates ran even higher across the board:

*Credit score tiers based on VantageScore 4.0

Beyond your credit score, lenders weigh the loan amount, the loan term, and whether the car is new or used.

Your down payment matters, too. Putting more down decreases the amount you borrow and can earn you a better rate since the lender takes on less risk. If you have extra savings beyond your emergency fund to put down, Maura suggests comparing your loan's interest rate to the return your money earns in savings or investments. The difference between those two numbers, or the delta, tells you which option costs you more.

"If you're going to pay 7% and you're only yielding 4% in that brokerage account, you're losing that delta. You're losing money," he says.

Auto loan terms can stretch to 84 or even 96 months, though 60- to 72-month terms are the most common. The average new car loan term hit 69.48 months in Q1 2026, and 35.55% of new car loans now run longer than six years, up from 30.83% a year ago.

A longer term lowers your monthly payment but raises your total cost. Here’s how a $30,000 loan at 7% APR might cost you in interest:

Maura recommends weighing the extra interest from longer loan terms against what your money could earn if invested and revisiting the math over time.

"If you're relying on your investments to earn more than your loan's interest rate, revisit that strategy regularly to make sure it's still the right financial move," he says.

Callout: If you took out a loan after Dec. 31, 2024, on a new personal-use vehicle, you may be able to deduct up to $10,000 in interest per year on your taxes through the 2028 tax year.

» Want to see if you're eligible? Check out our guide to the car loan interest tax deduction

When deciding how to finance a car, one of the biggest choices you'll make is where to get your loan. In general, you'll find better deals at banks or credit unions than at dealerships.

Bank and Credit Union Financing

Credit unions often have the lowest rates because they're member-owned nonprofits. Banks offer transparent pricing with no dealer markup, and you may get a rate discount as an existing customer or catch a promotional rate.

It's smart to get preapproved before you shop. You don't need to have a car picked out because your preapproved interest rate is typically locked for a set period, such as 30 days.

Dealership Financing

With dealer-arranged financing, the lender quotes the dealer a "buy rate," and the dealer can add interest on top as compensation. Dealers also typically contact about five lenders during the auto loan process, but present you with just one offer. Still, dealer incentives like 0% promotional rates, discounts, or free upgrades can sometimes beat outside offers.

Car loans let you spread the cost of a vehicle over time, but how you structure yours determines what you'll really pay. Keep the total cost in view, not just the monthly payment, and compare offers by APR rather than interest rate. Running the numbers through an auto loan calculator can help you see how different rates and terms change your total cost before you commit.

Also, start shopping early so you have time to compare offers from multiple lenders. The more you understand how auto loans work, the better positioned you'll be to spot a good deal when you see one.