What determines your auto loan rate

Your auto loan rate depends on four things: your credit score, the loan term you choose, the vehicle's age and mileage, and the lender's current rates. A lender pulls your credit report to assess risk — borrowers with scores above 750 typically get rates 2 to 3 percentage points lower than those below 620. The term matters too: a 36-month loan usually carries a lower rate than a 72-month loan from the same lender, because the lender faces less risk over a shorter payoff period.

The vehicle itself affects your rate. A 2-year-old car with 30,000 miles is easier to repossess and resell than a 10-year-old car with 120,000 miles, so lenders charge less for newer vehicles. Finally, lenders set their base rates based on the prime rate (which moves with Federal Reserve decisions) and their own cost of funds. When the Federal Reserve raises rates, lender rates rise; when it cuts rates, lenders eventually lower theirs, though not always when ready or by the same amount.

Key Takeaways

  • Your credit score is the single largest factor in your rate — improving it before refinancing can save you thousands over the loan's life.
  • Refinancing makes sense when your new rate is at least 0.5 to 1 percentage point lower than your current rate, depending on how much you still owe.
  • Lenders typically charge no fee to refinance, but some may require a hard credit pull, which temporarily lowers your score by a few points.
  • The longer you've been paying your current loan, the less refinancing saves you, because most of your early payments went to interest anyway.
  • Your vehicle's age and mileage matter — lenders may decline to refinance cars older than 10 years or with more than 150,000 miles, depending on the lender.

When refinancing actually saves money

Refinancing saves money only if your new rate is meaningfully lower than your current one. A 0.25 percentage point drop on a $20,000 loan over 60 months saves roughly $50 total — not worth the paperwork. A 1 percentage point drop on the same loan saves around $1,000. The math changes based on how much you still owe: if you've paid down half the loan, refinancing saves less because you have fewer payments left to benefit from the lower rate.

The timing of your refinance matters. If you're 12 months into a 60-month loan, you've paid roughly 30% of the total interest already. Refinancing at that point still saves money if the rate drop is large enough, but the savings are smaller than if you'd refinanced at month three. Use an online calculator (most credit unions and banks offer free ones) to plug in your current balance, remaining term, current rate, and the new rate you've been quoted. The calculator will show you the total interest you'll pay under both scenarios.

How your credit score affects the rate you'll get

Lenders use credit scores to predict the likelihood you'll default. Scores range from 300 to 850, and most lenders have minimum thresholds. A bank might require a 650 minimum; a credit union might accept 600. Within the range a lender accepts, every 50-point increase typically lowers your rate by 0.25 to 0.5 percentage points. A borrower with a 700 score might get 5.5%; one with a 750 might get 4.9% from the same lender.

If your score has improved since you took out your original loan, refinancing becomes attractive. Scores improve through consistent on-time payments (the largest factor), paying down existing debt, and correcting errors on your credit report. If you're considering refinancing, check your credit report at annualcreditreport.com (the only free, federally authorized site) for errors you can dispute. Even small errors can drag your score down. Wait to refinance until after any disputes are resolved, which typically takes 30 to 45 days.

The difference between rate shopping and hard credit inquiries

When you ask a lender for a rate quote, they perform a hard credit inquiry — they pull your full credit report and score. Each hard inquiry lowers your score by a few points, usually 5 to 10. Multiple inquiries within 14 days typically count as a single inquiry for scoring purposes, so rate shopping with several lenders in a short window doesn't compound the damage. After 14 days, each new inquiry is treated separately.

The score drop from a hard inquiry is temporary. Your score usually recovers within 3 to 6 months as long as you keep making on-time payments and don't take on new debt. If you're planning to refinance, do all your rate shopping within a two-week window, then wait a few months before explore for anything else (a mortgage, a credit card, another auto loan) that requires a hard pull. This strategy minimizes the total damage to your score.

Comparing offers from banks, credit unions, and online lenders

Banks, credit unions, and online lenders all refinance auto loans, and their rates vary. Banks typically require you to be an existing customer or to open an account; credit unions require membership (which is often free or low-cost); online lenders have no membership requirement but may have stricter vehicle age limits. A bank might refinance a 12-year-old car; an online lender might decline anything over 10 years old.

Get quotes from at least three lenders before deciding. Most will give you a rate quote over the phone or online without a hard inquiry — ask specifically whether they're doing a soft or hard pull. Once you've narrowed it down to your top choice, authorize the hard inquiry. Compare not just the rate but the term options they offer. Some lenders allow you to keep your current term (if you have 48 months left, they'll refinance for 48 months); others require you to choose a new term. Keeping your current term means your payoff date doesn't change, which is usually the smartest move.

What happens to your original loan when you refinance

When you refinance, the new lender pays off your old loan in full. You then owe the new lender instead of the old one. The new lender becomes the lienholder on your vehicle's title — they have a legal claim to the car until the loan is paid off. This transfer is handled by the lenders; you don't sign over the title yourself. The entire process typically takes 5 to 10 business days from approval to funding.

During those days, you still owe your old lender. Make your regular payment to them on schedule unless the new lender tells you to stop. Once the new lender's funds arrive at the old lender's account, your old loan is closed and you'll receive a payoff letter confirming the balance is zero. Your new payment schedule starts on the date the new lender funds the loan, not the date you applied. If you're refinancing to lower your payment, your first payment to the new lender will be lower than your current payment, but you'll make that first payment on whatever date the new lender sets — usually 30 to 45 days after funding.

Reasons a lender might decline your refinance request

Lenders decline refinance requests for three main reasons: your credit score is too low, your vehicle is too old or has too many miles, or you're underwater on the loan (you owe more than the car is worth). If your score has dropped since you took out the original loan — due to missed payments, high credit card balances, or recent hard inquiries — you may not meet the lender's minimum. In that case, focus on paying down credit card debt and making all payments on time for 3 to 6 months before trying again.

Vehicle age and mileage limits vary by lender. Most will refinance cars up to 10 years old with under 150,000 miles; some go to 12 years or 180,000 miles. If your car exceeds these limits, try credit unions in your area first — they often have more flexible policies than banks or online lenders. If you're underwater (your car is worth $15,000 but you owe $18,000), most lenders won't refinance because they have no collateral cushion if you default. In this case, wait until you've paid the loan down enough that you owe less than the car's market value.

Frequently Asked Questions

Will refinancing hurt my credit score?

Yes, but only temporarily. The hard credit inquiry lowers your score by 5 to 10 points, and the score recovers within 3 to 6 months. Refinancing also resets your average account age slightly (the new loan is younger than the old one), which can lower your score by a few more points. However, the long-term benefit — lower interest payments — outweighs this temporary dip if the rate savings are significant.

Can I refinance if I'm behind on payments?

Most lenders won't refinance if you're currently behind or have missed payments in the last 12 months. Some credit unions may consider you if you've caught up and made several on-time payments since, but this varies. If you're struggling with payments, contact your current lender about a loan modification or deferment before pursuing refinancing.

What if my new lender's rate is only slightly lower — is it worth it?

A rate drop of 0.25 to 0.5 percentage points saves very little over the remaining life of the loan. Use a calculator to see the exact dollar amount. If you're refinancing to change your term (say, from 72 months to 60 months to pay off faster), the rate drop matters less — you're making the trade-off intentionally. If you're refinancing only for rate savings, aim for at least a 0.75 to 1 percentage point drop.

Do I have to refinance with the same lender?

No. You can refinance with any lender that will approve you, regardless of who holds your current loan. In fact, shopping around with different lenders is the best way to find the lowest rate. Your current lender has no right to match a competitor's offer or to prevent you from refinancing elsewhere.

How long does the refinancing process take?

From process to funding typically takes 5 to 10 business days. Some online lenders can fund within 2 to 3 days if you're approved and submit documents quickly. Your old loan is paid off once the new lender's money arrives at the old lender's account, which may take an additional 1 to 3 business days. Your new payment schedule begins on the date the new lender funds the loan.