How car loans work and what lenders examine
A car loan is money a bank, credit union, or finance company lends you to buy a vehicle. You repay it in monthly installments over a set period — typically 36 to 84 months — plus interest. The lender holds a lien on the car, meaning they legally own it until you pay off the loan. If you stop making payments, the lender can repossess the vehicle.
Lenders decide whether to lend you money and at what interest rate by looking at three main things: your credit score, your income and debt-to-income ratio, and the car itself. Your credit score reflects your history of borrowing and repaying money. Your debt-to-income ratio is the percentage of your monthly income that goes toward existing debts — credit cards, student loans, mortgages, and other car loans. The car's age, mileage, and market value matter because the lender wants to know what they could recover if they had to repossess and sell it.
Key Takeaways
- Lenders examine your credit score, income, and existing debts to decide whether to lend and what interest rate to charge you.
- A down payment reduces the amount you borrow and lowers your monthly payment, and lenders often require one if your credit is weak or the car is used.
- Interest rates vary widely based on credit score, loan term, and whether the car is new or used — shopping with multiple lenders can save you hundreds of dollars.
- Your monthly payment depends on the loan amount, interest rate, and how many months you have to repay, and you can use online calculators to estimate what different scenarios cost.
- Getting pre-approved before you shop for a car tells you what interest rate you may have access to for and gives you negotiating power at the dealership.
What lenders look at: credit score and payment history
Your credit score is a three-digit number that summarizes how reliably you have borrowed and repaid money in the past. It ranges from 300 to 850. Scores above 700 are generally considered good; scores below 620 are considered poor. Lenders use your credit score as a shortcut: a higher score means you have a track record of paying bills on time, so they charge you a lower interest rate. A lower score means higher risk, so they charge a higher rate or decline to lend at all.
Your credit report, which the credit bureaus Equifax, Experian, and TransUnion maintain, shows the details behind your score: accounts you have opened, how much you owe, whether you have paid on time, and whether you have had collections, foreclosures, or bankruptcies. Lenders pull your credit report when you explore for a loan. Multiple inquiries in a short period (usually two weeks) count as a single inquiry, so shopping around with several lenders does not harm your score as much as it might seem.
Income, debt-to-income ratio, and how much you can borrow
Lenders want proof that you earn enough money to make the monthly payment. You will typically need to provide recent pay stubs, tax returns, or bank statements showing regular deposits. Self-employed people often need to show two years of tax returns. The lender calculates your debt-to-income ratio by adding up all your monthly debt payments — credit card minimums, student loans, mortgages, existing car loans — and dividing by your gross monthly income. Most lenders want this ratio to be 43 percent or lower, though some will go higher if your credit score is strong.
This ratio determines how much you can borrow. If you earn $4,000 per month and already owe $1,200 per month on other debts, your ratio is 30 percent. A lender willing to go to 43 percent would allow you to add about $520 per month in new car payments. The actual loan amount depends on the interest rate and loan term, but an online calculator can show you the range.
Down payments and how they affect your loan
A down payment is money you pay upfront toward the purchase price. The lender finances the rest. A larger down payment means you borrow less, which lowers your monthly payment and the total interest you pay over the life of the loan. For example, on a $25,000 car at 6 percent interest over 60 months, a $5,000 down payment reduces your monthly payment from $483 to $386 — a difference of $97 per month, or $5,820 over five years.
Lenders often require a down payment if your credit score is below 650 or if you are buying a used car. The amount varies; some lenders want 10 to 20 percent of the purchase price. If you have little or no down payment saved, some credit unions and banks offer loans with zero down, though your interest rate will be higher to offset the lender's increased risk. Avoid putting down money you cannot afford to lose, because if the car is totaled in an accident before you have paid off the loan, your insurance payout may not cover what you still owe.
Interest rates: what determines them and how to shop
Interest rates for car loans vary based on your credit score, the loan term, whether the car is new or used, and current market conditions. A borrower with a 750 credit score might may have access to for 4 percent on a new car, while a borrower with a 620 score might be offered 9 percent or higher. Used cars typically carry higher rates than new cars because they are riskier — they have more unknown history and less remaining value. Longer loan terms (72 or 84 months) usually have higher rates than shorter ones (36 or 48 months) because the lender is exposed to risk for longer.
Shopping with multiple lenders — banks, credit unions, online lenders, and captive finance companies owned by car manufacturers — can save you money. Each lender will quote you a rate based on a soft credit inquiry that does not affect your score. Compare the interest rate, the loan term, any fees (origination, prepayment penalties), and the monthly payment. A difference of 1 or 2 percentage points over a five-year loan can mean $1,500 to $3,000 in extra interest.
Pre-approval: getting a rate quote before you shop
Pre-approval is a lender's conditional offer to lend you a specific amount at a specific interest rate, based on information you provide. It is not a binding commitment, and it does not obligate you to borrow. Getting pre-approved before you visit a dealership tells you what you can afford and what interest rate you may have access to for. It also gives you negotiating power: you can tell the dealer you already have financing and ask them to match or beat that rate.
To get pre-approved, contact a bank, credit union, or online lender directly. You will need to provide your Social Security number, income information, and employment details. The lender will pull your credit report and give you a rate quote within a few hours or a day. The pre-approval is usually good for 30 to 60 days. If you find a car and the dealer offers you a better rate, you can use that instead. If the dealer's rate is higher, you can decline and use your pre-approval.
Loan terms and monthly payments: how the math works
The loan term is how many months you have to repay the loan. Common terms are 36, 48, 60, 72, and 84 months. A shorter term means higher monthly payments but less total interest paid. A longer term means lower monthly payments but more total interest paid. For example, a $20,000 loan at 6 percent interest costs $373 per month over 60 months (total interest: $2,380) or $286 per month over 84 months (total interest: $4,024).
Your monthly payment is calculated using a formula that factors in the loan amount, interest rate, and term. You do not need to do the math yourself — lenders provide payment calculators on their websites, and you can also find independent calculators online. Plug in the loan amount, interest rate, and term to see what your payment would be. This helps you decide whether a longer term is worth the extra interest, or whether you should put down more money to lower the payment on a shorter term.
New versus used cars: how the loan differs
New cars typically may have access to for lower interest rates because they are less risky — they have full warranties, known history, and predictable value. Used cars carry higher rates because they have unknown maintenance history, higher mileage, and less predictable resale value. Lenders also limit how old a used car can be; many will not finance cars older than 10 years, and some require the car to have fewer than 100,000 miles.
The loan amount for a used car is also limited by the car's market value. If you want to buy a used car worth $12,000 but the lender's appraisal comes in at $10,000, the lender may only finance $10,000. You would need to cover the $2,000 difference with a larger down payment or walk away. This is why getting pre-approved before you shop is useful — you know what the lender will finance before you fall in love with a specific car.
Frequently Asked Questions
What credit score do I need to get a car loan?
Most lenders will work with credit scores as low as 580 to 620, but the interest rate will be significantly higher than for borrowers with scores above 700. Some credit unions and banks have minimum scores of 650 or 660. If your score is very low, adding a co-signer with better credit can help you may have access to for a better rate.
Can I get a car loan if I have bad credit or no credit history?
Yes, but you will likely need a larger down payment and will pay a higher interest rate. Credit unions often work with borrowers who have limited credit history. Having a co-signer — someone who agrees to repay the loan if you do not — can also help. Some lenders specialize in subprime lending (loans to people with poor credit), but their rates are very high.
What happens if I pay off my car loan early?
Paying off early saves you interest because you stop accruing it once the loan is paid. However, some lenders charge a prepayment penalty — a fee for paying off early. Always ask the lender whether there is a prepayment penalty before you sign the loan agreement. If there is not, paying extra toward your principal each month can save you thousands in interest.
Should I finance through the dealership or get a loan from a bank first?
Getting pre-approved from a bank or credit union first gives you a baseline interest rate and negotiating power. You can then compare that to what the dealership offers. Dealerships often have relationships with multiple lenders and can sometimes match or beat bank rates, especially if you have good credit. Always compare the total cost, not just the monthly payment.
What is the difference between straightforward interest and add-on interest?
Most car loans use straightforward interest, which means interest is calculated on the remaining balance each month. Add-on interest, which is less common, calculates all the interest upfront and adds it to the loan amount. straightforward interest is better for you because if you pay off early, you save more interest. Always confirm which type your lender uses.