The lowest rates come from credit unions and banks, not dealerships, and your own credit score determines which lenders will offer them to you

The interest rate you pay on a car loan depends almost entirely on your credit score, the loan term you choose, and which lender you approach. Dealerships typically charge 2 to 3 percentage points higher than the best available rates because they mark up the loan after buying it from a bank or captive finance company. Credit unions and banks that pre-approve you before you shop will show you their actual rates upfront, while dealership finance managers often quote rates that change once paperwork is signed.

Your credit score is the single largest factor. Someone with a score above 750 might receive a rate around 4 to 6 percent from a bank, while someone with a score between 600 and 650 might see 10 to 15 percent from the same lender. The difference between a 4 percent and 8 percent rate on a $25,000 loan over five years is roughly $2,500 in extra interest paid. Checking your own credit score before you shop takes 10 minutes and tells you what range of rates to expect.

Key Takeaways

  • Credit unions and banks offer lower rates than dealerships because they do not mark up the loan after purchase, so getting pre-approved at either before you shop shows you the actual rate you will pay.
  • Your credit score is the primary factor lenders use to set your rate, and a 50-point difference in score can mean 1 to 2 percentage points difference in the rate offered.
  • Shorter loan terms (36 to 48 months) carry lower rates than longer terms (72 to 84 months), but monthly payments are higher, so the lowest rate is not always the lowest monthly cost.
  • Dealership rates are negotiable the same way the car price is negotiable, and you can refuse their offer and bring your own pre-approved loan to the dealership instead.
  • Shopping with multiple lenders in a short window (within 14 days) counts as a single credit inquiry, so comparing rates does not damage your score.

How credit unions and banks set their rates

Credit unions typically offer the lowest rates available because they are member-owned and do not need to generate profit for shareholders. Most credit unions will pre-approve you for a loan amount and rate before you find a car, which means you know your maximum budget and the exact rate you will pay. You do not need to be a member to join most credit unions — membership usually costs nothing and requires only a small deposit (often $5 to $25) into a savings account.

Banks offer rates that fall between credit unions and dealerships. Large national banks like Chase, Bank of America, and Wells Fargo all offer auto loans, as do smaller regional banks and online lenders like LendingClub and Lightstream. Banks will also pre-approve you, and the pre-approval is good for 30 to 60 days while you shop. The rate a bank offers depends on your credit score, income, debt-to-income ratio, and the loan term you request.

Both credit unions and banks will run a hard credit inquiry when you explore, which temporarily lowers your score by a few points. However, multiple inquiries from auto lenders within 14 days count as a single inquiry for credit scoring purposes, so you can shop with three or four lenders without additional score damage.

Why dealership rates are higher and how to negotiate them

Dealerships do not lend money themselves. Instead, they arrange financing through a bank or captive finance company (like Ford Credit or GM Financial), then mark up the rate by 1 to 3 percentage points and keep the difference. A dealership might buy a loan at 5 percent and sell it to you at 7 percent, pocketing the extra 2 percent as profit. This markup is built into the dealership's business model and is not disclosed upfront.

Dealership rates are negotiable. You can counter-offer just as you would on the car price. If the dealership quotes you 8 percent and you have a pre-approval letter from your bank at 5.5 percent, you can show the letter and ask the dealership to match it or come closer. Many dealerships will negotiate because losing the sale is worse than losing the markup. If they refuse to negotiate, you can walk away and bring your pre-approved loan to the dealership instead — they are required to accept outside financing.

Some dealerships use a tactic called "yo-yo sales," where they let you drive the car home and later call to say the financing fell through, then pressure you to accept a higher rate. This is legal in some states and illegal in others. Protect yourself by not signing a final contract until the dealership confirms the financing is approved in writing, and by keeping a copy of every document you sign.

How loan term affects your rate and monthly payment

Shorter loan terms carry lower interest rates because the lender's risk is lower — you repay the money faster. A 36-month loan might carry a rate 0.5 to 1 percent lower than a 60-month loan for the same borrower. However, the monthly payment on a shorter loan is higher. On a $25,000 loan, the difference between a 48-month loan at 6 percent ($580 per month) and a 72-month loan at 6.5 percent ($395 per month) is $185 per month, even though the longer loan costs more in total interest.

The lowest interest rate is not always the best choice if the monthly payment strains your budget. A loan you can afford to pay on time costs less overall than a lower-rate loan you cannot afford and end up defaulting on. Calculate the total cost (monthly payment times number of months, plus interest) for each term the lender offers, then choose the shortest term you can afford.

Steps to find and lock in the lowest rate

Step 1: Check your credit score. Visit annualcreditreport.com (the only federally mandated free credit report site) or use a free score tool like Credit Karma or NerdWallet. You do not need to pay for a score — free tools are accurate enough for shopping purposes. Write down your score.

Step 2: Get pre-approved at your credit union. If you are a member, visit your credit union's website or call and ask about auto loan pre-approval. If you are not a member, find a credit union near you using CO-OP (co-opshared.org) or MyCreditUnion.org, then join and explore. Pre-approval takes 15 to 30 minutes and requires your Social Security number, income, and employment information.

Step 3: Get pre-approved at one or two banks. Visit the websites of banks you already use or banks known for competitive rates (Lightstream, LendingClub, or your local bank). explore online. You will receive a pre-approval letter or email within one to three business days showing your rate and maximum loan amount.

Step 4: Compare the offers side by side. Write down the rate, loan term, and monthly payment from each lender. The lowest rate is not always the lowest monthly payment, so compare total cost over the life of the loan, not just the interest rate.

Step 5: Shop for a car with your pre-approval in hand. Bring the pre-approval letter to the dealership. When the dealership offers financing, compare their rate to your pre-approved rate. If the dealership's rate is higher, ask them to match your pre-approval or come closer. If they refuse, you can use your pre-approved loan instead.

When to refinance after you buy the car

If you accept a dealership loan with a higher rate than you wanted, you can refinance the loan with a bank or credit union after you own the car for a few months. Refinancing means taking out a new loan to pay off the old one. The new lender pays off your dealership loan, and you make payments to the new lender instead.

Refinancing makes sense if your credit score has improved since you bought the car, or if interest rates have dropped significantly. However, refinancing costs money — there may be an process fee, appraisal fee, or title transfer fee. Calculate whether the interest savings over the remaining loan term exceed the refinancing costs before you proceed. Most lenders will run this calculation for you during the pre-approval process.

You can refinance with any lender, not just the one you originally borrowed from. Credit unions and banks both offer refinance loans, and the process is the same as getting a new auto loan.

Frequently Asked Questions

Does shopping with multiple lenders hurt my credit score?

Multiple auto loan inquiries within 14 days count as a single inquiry for credit scoring purposes, so shopping with three or four lenders causes minimal score damage — usually 5 to 10 points temporarily. Your score recovers within a few months. Shopping with more than four lenders in a short window, or shopping across different types of credit (auto loans, credit cards, mortgages) in the same period, can cause more damage.

What if I have bad credit — can I still get a low rate?

Bad credit (a score below 600) limits your options, but credit unions are more flexible than banks and may offer rates 2 to 3 percentage points lower than dealerships for the same borrower. Some credit unions specialize in lending to people with poor credit. You may also improve your rate by making a larger down payment, which reduces the lender's risk, or by finding a co-signer with better credit.

Is it better to get a loan from the dealership or bring my own financing?

Bringing your own pre-approved loan is almost always better because you know the rate upfront and the dealership cannot mark it up. The only exception is if the dealership offers a special promotional rate (like 0 percent financing on certain models), which is sometimes lower than what you can get elsewhere. Compare the dealership's promotional rate to your pre-approval before deciding.

How long does a pre-approval last?

Pre-approval letters are typically good for 30 to 60 days. After that time, the lender may re-check your credit and adjust the rate if your score has changed or if interest rates have moved. If you find a car after your pre-approval expires, contact the lender and ask for a new pre-approval — it usually takes one business day.

Can I negotiate the interest rate after I sign the contract?

Once you sign a loan contract, the rate is locked in and cannot be changed by the dealership or lender. Your only option is to refinance with a different lender, which involves a new process, credit inquiry, and fees. This is why negotiating the rate before you sign is important.