How Auto Loans Work: Rates, Terms and Getting the Best Deal

Editorial note: This guide is for general education, not individualized financial advice. We independently research every topic and cite our sources. Our editorial standards · How we make money.

For most Americans, buying a car means financing it. How you finance it can matter almost as much as which car you choose: the difference between a good and a bad auto loan can add up to thousands of dollars. This guide explains how auto loans work and how to get a better deal. Estimate your payment with the auto loan calculator.

The basics

An auto loan is a secured installment loan. The vehicle serves as collateral, which is why auto loan rates are usually lower than rates on unsecured personal loans. If you stop paying, the lender can repossess the car.

You borrow the amount financed:

Vehicle price + sales tax + fees − down payment − trade-in value = amount financed

and repay it in equal monthly payments over the term, commonly 36 to 84 months.

What affects your auto loan rate

Dealer financing vs. direct lending

Direct lending

You apply with a bank, credit union or online lender and get preapproved for an amount and rate before you shop. You then buy the car much like a cash buyer.

Dealer-arranged financing

The dealer collects your application and sends it to one or more lenders. The dealer may be allowed to add a markup to the rate the lender offers and keep part of the difference as compensation. The captive lenders of car manufacturers sometimes offer promotional rates, including 0% APR, to buyers with excellent credit.

The best approach: get preapproved first, then let the dealer try to beat your rate. You will know immediately whether their offer is a good one.

Choosing a loan term

Longer terms reduce the monthly payment but cost more overall. On a $28,000 loan at 7.5% APR:

Rounded. Longer terms often carry higher rates in practice, which would widen these gaps.

Long terms also increase the risk of negative equity — owing more than the car is worth — because cars lose value fastest in the first few years. If the car is totaled or you want to trade it in early, you may have to cover the difference.

Down payments and trade-ins

A larger down payment lowers your payment and total interest and helps you avoid negative equity. Common guidance is about 20% down for new cars and 10% for used cars, but any amount helps.

For trade-ins:

• Research your car’s value before visiting the dealer.
• Get a separate offer from another dealer or an online buyer.
• In most states, the trade-in value reduces the taxable price of the new car — check your state’s rules.
• If you still owe on your trade-in, the dealer pays it off, but any negative equity may be rolled into your new loan. Avoid this if possible.

The dealership process, step by step

1. Get preapproved and know your budget.
2. Research prices for the model and trim you want.
3. Negotiate the out-the-door price — including all taxes and fees — before discussing financing or trade-in.
4. Negotiate the trade-in separately.
5. Compare financing: your preapproval vs. the dealer’s offer, by APR and total cost.
6. Review the finance office add-ons.
7. Read the contract carefully before signing: price, APR, term, amount financed and total of payments.

Add-ons to watch

In the finance office, you may be offered:

• Extended warranties or service contracts
• GAP coverage
• Paint and fabric protection
• Credit insurance

These are optional. They can add significantly to the amount financed, and you pay interest on them. You can decline them, negotiate their price, or buy some — like GAP coverage — elsewhere, often for less. The FTC advises consumers to review every line of the contract.

Leasing vs. buying

A lease usually has lower monthly payments, but you do not own the car at the end, and there are mileage limits and wear-and-tear charges. Buying costs more monthly but builds ownership, and once the loan is paid off you have no payment. If you plan to keep a car for many years, buying typically costs less over time.

Refinancing an auto loan

If rates have dropped or your credit has improved since you bought the car, refinancing can lower your rate and payment. Check for fees, avoid extending the term too far and make sure the car’s value supports the loan.

The bottom line

Treat the car price, trade-in and financing as three separate negotiations, get preapproved to benchmark the dealer, choose the shortest term you can comfortably afford and decline add-ons you do not need. Run the numbers in the auto loan calculator and explore our auto loans section.

This guide is part of our Loans hub and our complete personal finance guide. Spot an error? Request a correction.