What determines the rate you'll see when you refinance

The rate a lender offers you depends on five things: your credit score, the age and mileage of your car, how much you still owe versus what it's worth, current market rates, and the lender's own pricing. You cannot control market rates or a lender's pricing strategy, but the first three are yours to influence. A score above 700 typically unlocks rates in the 4–6% range at credit unions and banks, while scores below 620 often see rates above 8%. A car with 80,000 miles and a clean title will refinance more easily than one with 150,000 miles or a salvage title.

The spread between the best rate available and the one you're offered can be 1–3 percentage points depending on your situation. On a $20,000 loan, that difference costs you $200–$600 per year in extra interest. Shopping across multiple lenders is the only way to see what you actually may have access to for, because each lender pulls your credit and runs their own calculation.

Key Takeaways

  • Your credit score is the single largest factor in the rate you receive; scores above 700 typically see rates 2–4 points lower than scores below 620.
  • Credit unions and banks often offer lower rates than online lenders or dealerships, but you must be a member or meet their membership requirements.
  • Getting quotes from at least three to five lenders takes 15–30 minutes and shows you the real range of rates available to you.
  • The age, mileage, and loan-to-value ratio of your car affect the rate as much as your credit does; older or higher-mileage vehicles refinance at higher rates.
  • Comparing the total interest paid over the loan term, not just the monthly payment, reveals whether a lower rate actually saves you money.

Where the lowest rates typically come from

Credit unions consistently offer the lowest rates for auto refinancing. The National Credit Union Administration does not publish a single "best rate," but credit union rates are typically 0.5–1.5 percentage points lower than bank rates for the same borrower. You must be a member to borrow, but membership is often free or costs $5–$25 one time. Some credit unions require you to live or work in a specific area; others serve members nationwide through online applications.

Banks come second. Large national banks like Chase, Bank of America, and Wells Fargo offer refinancing, but their rates are usually higher than credit unions. Regional and community banks sometimes match credit union rates if you have an existing relationship with them. Online lenders like LendingClub, Upstart, and SoFi advertise heavily, but their rates are not systematically lower than banks—they straightforward reach borrowers who do not have credit union access or existing bank relationships.

Dealerships and buy-here-pay-here lots almost never offer the best rates. They profit from financing, so their incentive is to keep rates high. If you refinance away from a dealership loan, you are usually saving money.

How to get quotes and compare them accurately

Start by checking your credit score through a free service like AnnualCreditReport.com or your bank's credit monitoring tool. This tells you what range of rates to expect before you explore anywhere. Then contact your own credit union or bank first—they may offer member discounts or relationship pricing that online lenders cannot match.

Next, get quotes from at least two to three other lenders. Each quote requires a hard credit pull, which temporarily lowers your score by 5–10 points, but multiple pulls for the same type of loan (auto refinancing) within 14–45 days count as a single inquiry. Lenders know you are shopping, so they expect it. Gather quotes within a short window—a week or less—to keep the impact on your score minimal.

When comparing quotes, look at the annual percentage rate (APR), not just the interest rate. The APR includes fees and is the true cost of borrowing. A quote showing 5.2% APR is directly comparable to another showing 5.8% APR. Then calculate the total interest you will pay over the full loan term. A lower rate over 60 months might cost less total interest than a higher rate over 48 months, even though the monthly payment is higher. Use the lender's loan calculator or a straightforward spreadsheet to see the total.

Why your credit score matters more than anything else

Lenders use your credit score as a shorthand for risk. A score of 750+ typically qualifies for rates between 3.5–5.5%. A score of 700–749 usually sees 4.5–6.5%. A score of 650–699 often gets 6–8%. Below 650, rates climb above 8% and may exceed 10% at some lenders. The difference between a 720 score and a 680 score can be 1.5–2 percentage points on the same loan amount.

If your score is below 700, you have two options: refinance now at a higher rate, or wait 3–6 months while you pay down other debts or dispute errors on your credit report. Paying down credit card balances lowers your utilization ratio and can raise your score 20–50 points. Disputing inaccurate late payments or collections accounts can raise it further. The math is straightforward: if waiting six months raises your score 40 points and saves you 0.75% on the rate, you save more in interest than you would have by refinancing when ready.

The role of your car's age, mileage, and loan-to-value ratio

Lenders care about the car itself because it is their collateral. A 2022 Honda Civic with 40,000 miles refinances at a better rate than a 2015 Civic with 120,000 miles, all else equal. Most lenders will not refinance cars older than 10 years or with more than 150,000 miles, regardless of your credit score. Some credit unions are more flexible and will go to 12 years or 180,000 miles, but rates climb steeply in that range.

The loan-to-value (LTV) ratio is the amount you owe divided by what the car is worth. If you owe $15,000 and the car is worth $20,000, your LTV is 75%. Lenders prefer LTV below 100% and offer better rates for LTV below 80%. If you owe more than the car is worth (underwater), refinancing is harder and rates are higher. You can improve your LTV by making a lump-sum payment toward principal before you refinance.

Comparing monthly payment versus total interest cost

A lower monthly payment is tempting but can cost you thousands more in total interest. Suppose you have a $20,000 loan at 7% with 48 months remaining. Refinancing to 5% over the same 48 months lowers your payment by about $95 per month and saves you roughly $1,800 in interest. But if you refinance to 5% over 60 months instead, your payment drops by only $40 per month—and you pay an extra $1,200 in interest because you are borrowing for 12 extra months.

Always calculate the total interest paid, not just the monthly savings. A spreadsheet or the lender's calculator takes two minutes. The rule is straightforward: shorter loan terms cost less total interest, even if the monthly payment is higher. Refinancing to a lower rate over the same or shorter term is almost always worth doing. Refinancing to a lower rate over a longer term is worth doing only if the monthly savings matter more to your budget than the extra interest cost.

When refinancing makes financial sense and when it doesn't

Refinancing makes sense if the new rate is at least 0.5–1 percentage point lower than your current rate and you plan to keep the car for at least two more years. The break-even point is usually 12–18 months; after that, the interest savings exceed any fees. Most refinances have no process fee, but some lenders charge $50–$200. Factor that in when you calculate total savings.

Refinancing does not make sense if you are underwater on the loan (owe more than the car is worth) and cannot pay the difference upfront, because lenders will not refinance you. It also does not make sense if you are planning to sell or trade the car within the next year, because you will not recoup the time and effort. And if your credit score has dropped since you took out the original loan, refinancing to a higher rate is a net loss—focus on improving your score first.

Frequently Asked Questions

How much does refinancing lower my monthly payment?

The reduction depends on how much lower your new rate is and how long you stretch the loan. A 2% rate drop on a $20,000 loan over 48 months saves roughly $95 per month. Stretching the loan to 60 months saves another $40 per month but adds $1,200 in total interest. Use the lender's calculator with your exact numbers to see the real impact.

Will refinancing hurt my credit score?

Yes, temporarily. Each lender pulls your credit, which lowers your score 5–10 points per pull. Multiple pulls for auto refinancing within 14–45 days count as one inquiry, so the damage is limited. Your score recovers within 3–6 months as you make on-time payments on the new loan. The long-term benefit of a lower rate outweighs the short-term score dip.

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

Most lenders will not refinance if you are underwater. Some credit unions will if you pay the difference upfront or agree to a higher rate. Your best option is to make extra principal payments until your loan-to-value ratio drops below 100%, then refinance. This takes 6–12 months depending on how underwater you are.

What documents do I need to refinance?

You need your current loan documents (showing the lender and account number), proof of insurance, and the vehicle identification number (VIN). The new lender handles the payoff of your old loan directly. You do not need to visit a branch or mail anything for most online refinances.

How long does refinancing take from start to finish?

Getting quotes takes 15–30 minutes. Approval typically takes 2–5 business days. Funding and payoff of your old loan takes another 3–7 business days. Total time from process to your first payment on the new loan is usually 1–2 weeks.