What to look at when comparing auto loans
When you compare auto loans, you are looking at four numbers that determine what you actually pay: the interest rate, the loan term, the monthly payment, and the total cost over the life of the loan. A lower interest rate does not always mean the lowest total cost if the term is longer. A shorter term means higher monthly payments but less interest paid overall. You need to see all four numbers from each lender before you decide.
Most lenders will show you these numbers in a form called a Loan Estimate or Truth in Lending disclosure. This form is required by federal law and must show the annual percentage rate (APR), the finance charge in dollars, the amount financed, and the payment schedule. If a lender will not give you this form before you commit, that is a sign to look elsewhere.
Key Takeaways
- The interest rate and loan term together determine your monthly payment and total cost, so compare all four numbers, not just the rate.
- Banks, credit unions, and online lenders often have different rates for the same borrower, so getting quotes from at least three sources takes 15 minutes and can save hundreds of dollars.
- Your credit score, down payment size, and the age of the car all affect the rate you receive, so the rate one person gets is not the rate you will get.
- A loan term of 36 to 60 months is standard; longer terms lower your monthly payment but cost more in total interest.
- Pre-approval from a lender shows you the real rate and term you may have access to for before you step into a dealership.
Where to get loan quotes and what to ask for
Start by getting pre-approval quotes from at least three different sources: your bank, a credit union you belong to or can join, and one online lender. Pre-approval means the lender has looked at your credit and income and told you the rate and term they will offer you, without you committing to anything. This takes 10 to 20 minutes per lender and costs nothing.
When you request a quote, tell each lender the same information: the price of the car you want, your down payment amount, the loan term you are considering (for example, 60 months), and whether the car is new or used. Ask them to send you the Loan Estimate in writing. Do not let them quote you a monthly payment without showing you the APR and total finance charge — those numbers are what let you compare fairly.
If you are buying from a dealership, do not accept their first loan offer. Dealerships often mark up the interest rate they receive from their lender, so the rate they quote you is higher than what you could get on your own. Use your pre-approval quotes as a benchmark. If the dealership's rate is higher, tell them your pre-approval rate and ask them to match it or beat it.
How interest rates and loan terms affect your total cost
The relationship between rate, term, and total cost is not obvious from the monthly payment alone. A lower rate over a longer term can cost you more in total interest than a higher rate over a shorter term. Here is a concrete example: a $25,000 loan at 5% APR for 60 months costs $2,656 in total interest. The same $25,000 at 4% APR for 72 months costs $2,856 in total interest — more, even though the rate is lower.
The monthly payment tells you what fits your budget right now, but the total finance charge tells you what the loan actually costs you. Always ask for both. A lender who shows you only the monthly payment is hiding the real cost from you.
Loan terms typically range from 36 months to 84 months. A 36-month term means higher monthly payments but you own the car free and clear sooner. A 72-month or 84-month term spreads the cost over more months, lowering the payment, but you pay significantly more in interest and you may owe more than the car is worth for much of the loan (called being "upside down" on the loan). Most financial advisors suggest staying between 48 and 60 months unless your budget genuinely requires a longer term.
What affects the rate you receive
The interest rate a lender offers you depends on three main factors: your credit score, your down payment, and the age and mileage of the car. A higher credit score gets you a lower rate. A larger down payment lowers your rate because the lender's risk is smaller. A newer car with lower mileage gets a better rate than an older car because it holds its value better and is easier to repossess and sell if you default.
This means the rate your friend received is not the rate you will receive, even if you go to the same lender. If your credit score is lower, you will pay more. If you are putting down less money, you will pay more. If you are buying a 10-year-old car instead of a 2-year-old car, you will pay more. When you compare quotes, make sure each lender is quoting you on the same car, the same down payment, and the same term. If the details change, the rate changes.
Comparing fixed-rate and variable-rate loans
Almost all auto loans are fixed-rate, meaning your interest rate and monthly payment stay the same for the entire loan term. This is the standard and the safest option because you know exactly what you will pay every month.
Some lenders offer variable-rate auto loans, where the interest rate can change based on market conditions. These are rare for auto loans and usually come with a higher starting rate to compensate the lender for the risk. Unless you are certain you will pay off the loan in a year or two, a fixed-rate loan is simpler and more predictable. When you compare loans, assume you are comparing fixed-rate loans unless a lender specifically tells you otherwise.
How to use pre-approval to negotiate at the dealership
A pre-approval letter from your bank or credit union is a powerful tool at the dealership. It shows the dealer you have already been approved for a loan at a specific rate, which means you are a serious buyer and you have an outside option if their financing is not competitive. Bring the pre-approval letter with you when you visit the dealership.
When the dealership offers you financing, compare their rate to your pre-approval rate. If it is higher, tell them you have pre-approval at a lower rate and ask if they can match it. Many dealerships will, because they make money on the sale of the car, not just on financing. If they cannot match your rate, you can use your pre-approval and walk away from their financing offer.
One note: if you use your pre-approval, the lender will do a final credit check before funding the loan. This check may lower your rate slightly or raise it slightly depending on what they find, but the change is usually small if you have not opened new credit accounts or missed payments since the pre-approval.
Red flags when comparing loans
If a lender will not show you the APR and total finance charge in writing, do not work with them. If they pressure you to decide quickly or tell you the rate is only good for today, that is a pressure tactic and a sign to look elsewhere. If the monthly payment seems too good to be true, check the loan term — they may have stretched it to 84 months or longer to make the payment look affordable.
If a lender asks you to pay an upfront fee before you receive a quote, that is a warning sign. Legitimate lenders do not charge for pre-approval. If a lender quotes you a rate that is dramatically lower than what other lenders are offering, ask them to explain why. Sometimes there is a legitimate reason (you have excellent credit, you are putting down a large amount), but sometimes it means there are hidden fees or the rate will change once you commit.
Frequently Asked Questions
Should I get pre-approval from my bank or a credit union?
Both are worth checking. Credit unions often have lower rates than banks for borrowers with average credit, but you have to be a member. Banks are faster and easier to work with if you already have an account there. Get quotes from both and compare the numbers. The difference can be significant.
What if my credit score is low?
You will pay a higher interest rate, but you can still shop around. Different lenders have different standards for low credit scores. Some specialize in lending to borrowers with lower scores and may offer better rates than a traditional bank. Getting quotes from at least three lenders is even more important when your credit is lower, because the rate difference between lenders can be larger.
Can I change my loan term after I sign?
No, the term is locked in when you sign the loan agreement. You can refinance later if interest rates drop or your credit score improves, but that means explore for a new loan and paying closing costs again. Choose your term carefully the first time.
Is a longer loan term always bad?
A longer term means lower monthly payments but more total interest paid. If a 60-month payment stretches your budget too thin, a 72-month loan may be the right choice for you. Just go in with your eyes open about the total cost. Do not let a dealership push you into an 84-month term without understanding what you are paying.
What if the dealership says they can get me a better rate than my pre-approval?
Ask them to show you the Loan Estimate in writing with the APR and total finance charge. If the numbers are genuinely better, take it. If they are quoting you a lower payment but a longer term, the total cost may actually be higher. Compare the total finance charge, not just the monthly payment.