What counts as a low interest rate, and where they come from

A low interest rate on an auto loan is relative to what lenders are currently offering, not a fixed number. If the average rate across all borrowers is 6.5%, then 5.2% is low. If the average is 4%, then 5.2% is high. The rate you see advertised by a bank or credit union depends on the lender's cost of money, their risk assessment of you as a borrower, the loan term you choose, and the age and type of vehicle you're buying.

Rates come from two main sources: banks (which borrow from depositors and the Federal Reserve) and credit unions (which pool member deposits). Both set their own rates based on how much they pay to borrow money themselves, plus a margin for profit and risk. A third source is the dealership's finance office, which arranges loans through a network of lenders and marks up the rate — this is almost never the lowest option available to you.

The Federal Reserve's interest rate decisions affect what banks and credit unions pay to borrow, which then flows into the rates they offer you. When the Fed raises its rate, auto loan rates typically rise within weeks. When it cuts rates, lender rates fall more slowly and by smaller amounts.

Key Takeaways

  • The lowest rates usually go to borrowers with credit scores above 700, a down payment of at least 10 to 20%, and a loan term of 36 to 60 months.
  • Credit unions often offer lower rates than banks, especially to members with direct deposit or existing accounts, but you must be a member to borrow.
  • Pre-shopping with your bank or credit union before visiting a dealership tells you your actual rate and prevents the dealer from marking it up.
  • A shorter loan term (36 or 48 months instead of 72 or 84) lowers your interest rate but raises your monthly payment.
  • Refinancing an existing auto loan through a credit union or bank can reduce your rate if your credit score has improved or rates have fallen since you bought the car.

How your credit score and down payment affect the rate you're offered

Lenders use your credit score as the primary signal of how likely you are to repay. A score of 750 or higher typically qualifies you for the lowest advertised rates — often 2% to 4% depending on the lender and market conditions. A score between 700 and 749 usually qualifies for rates in the 4% to 6% range. Below 700, rates climb quickly, and below 650, many mainstream lenders decline to lend at all.

Your down payment also moves the rate. A larger down payment means the lender is risking less money, so they charge less interest. Putting down 20% instead of 10% can lower your rate by 0.5% to 1%. Putting down nothing — a 100% financed loan — raises the rate by 1% to 2% compared to a 20% down payment, all else equal.

The vehicle itself matters too. Lenders charge lower rates for new cars and recent used models because they hold their value and are easier to repossess and resell if you default. A 10-year-old car with high mileage will carry a higher rate than a 3-year-old car, even if you have the same credit score.

Banks versus credit unions: where the rate difference comes from

Credit unions typically offer rates 0.5% to 1% lower than banks for the same borrower and vehicle. This happens because credit unions are member-owned nonprofits with lower overhead costs and no shareholders to pay. They also tend to be more flexible about credit score thresholds — some will lend to borrowers with scores in the 600s if they have other positive factors like a large down payment or a co-signer.

However, you must be a member to borrow from a credit union, and membership rules vary. Some credit unions are open to anyone in a geographic area. Others restrict membership to employees of a specific company, members of a specific profession, or people who live or work in a particular county. A few have no restrictions at all. You can search for credit unions in your area through the CO-OP Network or Alliant Credit Union's locator tool.

Banks offer the advantage of wider availability — you can walk into most banks without membership — but their rates are usually higher. Some banks offer slightly better rates to existing customers with direct deposit or a checking account, so it's worth asking your current bank what they can offer before shopping elsewhere.

Pre-shopping versus dealership financing: why the timing matters

The dealership's finance office will offer you a loan, but that loan comes from a lender (usually a bank or captive finance company owned by the automaker). The dealership marks up the rate by 1% to 3% and keeps the difference as profit. A lender might approve you at 4.5%, but the dealership presents it as 6% or 7%.

Pre-shopping means getting a rate quote from your bank or credit union before you go to the dealership. You then know your actual rate and can compare it directly to what the dealer offers. If the dealer's rate is higher, you can decline their financing and use your pre-approved loan instead. This also gives you negotiating power — you can tell the dealer you have financing lined up and they may lower their offer to compete.

The dealership will still ask if you want to finance through them. Some dealers offer incentives (cash rebates or lower prices) if you finance with them, so it's worth hearing their offer. But you are never obligated to use their financing, and most borrowers save money by using a pre-approved rate from a credit union or bank.

Loan term and how it affects both your rate and monthly payment

A loan term is how many months you have to repay the loan. Common terms are 36, 48, 60, 72, and 84 months. Shorter terms carry lower interest rates because the lender's money is at risk for less time. A 36-month loan might be offered at 3.5%, while a 72-month loan on the same car and borrower might be 5.5%.

However, a shorter term means a higher monthly payment. If you borrow $25,000 at 3.5% for 36 months, your payment is roughly $730 per month. The same loan at 5.5% for 72 months is roughly $400 per month. The total interest you pay over the life of the loan is much higher on the longer term — about $3,800 versus $1,800 — but your monthly budget may not allow the higher payment.

The trade-off is real: you can have a low interest rate or a low monthly payment, but not both. Most financial advisors recommend the shortest term you can afford because you pay less total interest. But if a 72-month loan is the only way you can afford the car without overextending your budget, it's better to take it than to buy a car you can't afford.

Refinancing an existing auto loan to a lower rate

If you financed a car through a dealership or a bank and your credit score has improved since then, or if interest rates have fallen, you can refinance through a credit union or bank. Refinancing means taking out a new loan to pay off the old one. The new lender pays off your existing loan, and you make payments to the new lender instead.

Refinancing makes sense if the new rate is at least 1% lower than your current rate and you have at least 12 to 18 months of payments left on the original loan. If you have only 6 months left, the interest savings won't justify the process fees and paperwork. Most credit unions charge little or nothing to refinance, but some banks charge $200 to $500.

To refinance, contact your credit union or bank and ask for a rate quote. They will pull your credit report and ask for the vehicle's details (year, make, model, mileage, and current loan balance). If you're approved, they handle the paperwork and contact your current lender to pay off the old loan. The process usually takes one to two weeks.

What to watch for when comparing rates across lenders

When you get rate quotes from different lenders, make sure you're comparing the same thing. Ask each lender for the rate on the same loan amount, term, down payment, and vehicle. A quote for a 60-month loan at one credit union is not comparable to a quote for a 72-month loan at another, even if the monthly payment looks similar.

Also ask whether the rate is the Annual Percentage Rate (APR) or just the interest rate. The APR includes the interest rate plus any fees the lender charges, so it's the true cost of borrowing. Some lenders advertise a low interest rate but charge high origination fees, making the APR higher than a competitor's.

Rates change daily and sometimes hourly, so a quote is usually good for 30 to 45 days. If you're shopping multiple lenders, do it within a few days so the rates are comparable. Multiple credit inquiries within 14 days count as a single inquiry on your credit report, so shopping around doesn't hurt your score.

Frequently Asked Questions

What credit score do I need to get a low interest rate?

Most lenders offer their lowest rates to borrowers with scores of 750 or higher. Scores between 700 and 749 usually may have access to for rates that are 1% to 2% higher. Below 700, rates rise significantly, and below 650, many mainstream lenders won't lend at all. Credit unions are sometimes more flexible and may lend to borrowers with scores in the 600s if other factors are strong.

Can I get a low rate on a used car?

Yes, but the rate will be higher than on a new car of the same age and mileage. A 3-year-old used car might may have access to for a rate 0.5% to 1% higher than a new car. A 10-year-old car might be 2% to 3% higher. Some lenders have age and mileage limits — they won't finance cars older than 10 years or with more than 150,000 miles — so check before you shop.

Should I always choose the shortest loan term to save on interest?

The shortest term you can afford saves the most interest, but only if you can comfortably make the payment without straining your budget. If a 36-month term forces you to cut back on savings or other necessities, a 60-month term is the better choice. The extra interest you pay is worth the financial stability of a payment you can actually afford.

Can I refinance if I still owe more than the car is worth?

Yes, but most lenders will refinance only the amount the car is currently worth, not the full balance you owe. If you owe $20,000 and the car is worth $18,000, they'll refinance $18,000 and you'll have to pay the remaining $2,000 out of pocket or keep it on your original loan. Some credit unions will refinance the full amount if you have good credit, so it's worth asking.

How often can I refinance an auto loan?

There's no legal limit on how many times you can refinance, but lenders typically want to see at least 12 months between refinances. Refinancing too frequently can raise red flags and make lenders hesitant to approve you. Also, each refinance involves a hard credit inquiry, which temporarily lowers your score by a few points, so refinancing more than once a year usually isn't worth it.