Where Your Interest Rate Comes From
Your car loan interest rate is set by the lender — the bank, credit union, or dealership financing company — based on how risky they think it is to lend you money. The rate you see in your loan paperwork is the result of several factors working together, and you can understand how each one affects the number.
The lender starts with a base rate that changes with the market. Then they add points based on your credit score, the size of your down payment, how long you want to borrow for, and the age and value of the car itself. A stronger credit score and a larger down payment both push your rate down. A longer loan term and an older car both push it up. You do not negotiate a rate the way you negotiate a car price — but you can see exactly which factors are moving the number, and you can change some of them before you sign.
Key Takeaways
- Your interest rate depends on your credit score, down payment size, loan length, and the car's age — each one is a separate factor the lender calculates.
- You can see the rate before you sign the loan agreement, and you should compare offers from at least two different lenders to know if the rate is competitive.
- A higher credit score or larger down payment will lower your rate, and these are the two factors you can most easily control.
- The interest rate shown in your paperwork is the annual percentage rate, or APR, which includes both the interest and any fees the lender charges.
How to Read Your Loan Paperwork
The interest rate appears in your loan agreement under the heading Annual Percentage Rate or APR. This is the number you will see quoted — for example, 6.5% or 8.2%. The APR includes both the interest itself and any origination fees or other charges the lender wraps into the loan cost, so it is the true cost of borrowing.
Your paperwork will also show the loan term, which is how many months you are borrowing for — typically 36, 48, 60, or 72 months. The longer the term, the lower your monthly payment, but the higher your total interest cost. A lender will often show you what your rate would be at different term lengths so you can see the trade-off.
Look for a line item labeled Finance Charge or Total Interest. This is the dollar amount of interest you will pay over the life of the loan. Multiply your monthly payment by the number of months, subtract the car's price, and you should get close to this number — the difference is the total cost of borrowing.
What Your Credit Score Does to the Rate
Your credit score is the single largest factor a lender uses to set your rate. A score of 750 or higher typically qualifies for the lowest rates available. A score between 650 and 749 will see a noticeably higher rate. A score below 650 may mean the lender charges 2 to 4 percentage points more, or declines to lend at all.
You can check your own credit score for free through AnnualCreditReport.com, which is the official site for the three major credit bureaus. The score you see there is usually close to what a lender will see, though different lenders use slightly different scoring models. If your score is lower than you expected, you can ask the lender to explain which factors are pulling it down — missed payments, high credit card balances, or recent hard inquiries all hurt the score.
If you have time before you buy, paying down credit card balances and making on-time payments for a few months can raise your score enough to lower your rate by half a percentage point or more. That may not sound like much, but on a $30,000 loan it saves you hundreds of dollars over the life of the loan.
How Down Payment Size Changes Your Rate
A larger down payment lowers your interest rate because it reduces the lender's risk. When you put down 20% of the car's price, the lender is lending you only 80% — if the car is repossessed and sold, the lender is more likely to recover their money. A down payment of 10% or less will result in a higher rate, sometimes by a full percentage point or more.
The down payment also affects whether you will owe more than the car is worth — a situation called being underwater on the loan. If you finance $25,000 on a $25,000 car with no money down, and the car depreciates to $20,000 in the first year, you still owe $25,000. Lenders price this risk into your rate. A 20% down payment ($5,000 on a $25,000 car) moves you into a lower risk category and lowers your rate.
The Effect of Loan Length and Car Age
A longer loan term spreads your payments over more months, which lowers your monthly payment but raises your interest rate. A 36-month loan will have a lower APR than a 72-month loan for the same car and borrower, because the lender is taking on more risk over a longer period. The difference is usually 0.5 to 1.5 percentage points.
The age of the car also matters. A new car typically qualifies for a lower rate than a used car, because a new car is less likely to break down and become worthless before the loan is paid off. A car that is 5 years old or older may see a rate that is 1 to 2 percentage points higher than a brand-new car. Some lenders will not finance cars older than 10 years at all, or will require a larger down payment.
How to Compare Rates Between Lenders
Do not accept the first rate a dealership offers. Get rate quotes from at least two other sources — your bank, a credit union, or an online lender — before you buy. Each lender will ask for your credit score, income, and the car's details, and will give you a rate quote that is good for a set number of days, usually 30 to 45 days.
When you compare quotes, make sure you are comparing the same loan: the same car price, the same down payment, and the same loan term. A quote for a 60-month loan at one lender is not comparable to a quote for a 72-month loan at another. Write down the APR, the monthly payment, and the finance charge for each quote, and line them up side by side.
A difference of even 0.5% between lenders can mean hundreds of dollars in total interest. On a $30,000 loan over 60 months, the difference between 6% and 6.5% is roughly $400 in extra interest. Shopping around takes an hour and can save you real money.
What Happens After You Know Your Rate
Once you have a rate quote from a lender, you can use it to negotiate with the dealership. If the dealership's financing offer is higher, you can tell them you have a pre-approved rate from your bank and ask them to match it. Many dealerships will, because they make money on the loan and want your business.
If you decide to finance through the dealership, ask them to put the rate in writing before you sign any paperwork. The rate should not change between the quote and the final agreement unless you change the loan terms — the down payment, the term length, or the car itself. If the dealership tries to raise the rate at signing, you have the right to walk away and use your pre-approved rate from your bank instead.
Frequently Asked Questions
Can I negotiate my interest rate down after I sign the loan?
No, the rate is locked in when you sign the loan agreement. However, some lenders allow you to refinance the loan later — pay it off with a new loan at a better rate — if your credit score improves or if market rates drop. Refinancing has its own costs, so ask the new lender whether the savings are worth it.
Why is my rate higher than the rate advertised on the lender's website?
Advertised rates are usually the lowest rates available, offered to borrowers with excellent credit scores and large down payments. Your rate is based on your specific situation. If your credit score is lower or your down payment is smaller than the advertised scenario, your rate will be higher. This is normal and expected.
Does shopping for rates hurt my credit score?
Multiple rate inquiries from different lenders within a short window — usually 14 to 45 days — count as a single inquiry for credit scoring purposes. Shopping around for car loans does not significantly damage your score. However, each inquiry does create a small dip, so avoid explore to many lenders over several months.
What is the difference between APR and interest rate?
The interest rate is the percentage of the loan amount you pay in interest each year. The APR includes the interest rate plus any fees the lender charges, expressed as an annual percentage. For car loans, the APR is usually only slightly higher than the interest rate, but it is the number you should use when comparing offers.
If I pay off my loan early, do I save money on interest?
Yes. When you pay off a loan early, you stop accruing interest on the remaining balance. The interest savings depend on how much earlier you pay it off and how much interest you have already paid. Ask your lender whether there is a prepayment penalty — most car loans do not have one, but some do.