Should you refinance your auto loan?
If your rate is high, your credit score has improved, or you financed through a dealer — refinancing might save you thousands. Here's how to find out.
Last updated June 2026
Why auto loan rates are often too high
Most car buyers finance at the dealership — it's convenient, and the dealer presents the rate as part of the deal. What many buyers don't realize is that dealers often earn a "dealer reserve" by marking up the rate from the wholesale rate they received from the lender. This markup can be 1–2 percentage points and represents pure dealer profit.
Other reasons you might be overpaying on your current loan:
- You financed when interest rates generally were higher, and rates have since dropped
- Your credit score has improved since you took the loan (especially common in the first 2 years of driving history or after resolving past issues)
- You accepted the first offer without shopping
- You took a longer term to lower monthly payments, and now you want to shorten it to save interest
The break-even calculation
Refinancing typically involves fees — title transfer, lien release, and sometimes origination. These are usually $200–$400. To find your break-even:
Break-even (months) = Refinance fees ÷ Monthly payment savings
Example: $300 in fees, $85/month savings → break-even at 3.5 months. If you keep the vehicle more than 4 months after refinancing, you come out ahead.
The Auto Loan & Refinance Calculator does this math automatically in Refinance mode — enter your current balance, APR, and the new offer to see the monthly savings, lifetime interest savings, and break-even point.
The terms to compare
When refinancing, you have two levers:
- Rate (APR). The most important variable. Each percentage point lower saves meaningful money on a $15,000–$30,000 balance.
- Term (loan length). Shortening the term saves total interest but raises monthly payments. Extending the term lowers monthly payments but costs more in total interest and keeps you underwater longer.
Common mistake: Extending the term to lower monthly payments while also lowering the rate. The lower rate savings get partially eroded by the longer interest accumulation period. Model this in the calculator before committing.
When to skip refinancing
- Your loan is nearly paid off. If you have 12 months or fewer remaining, refinancing fees and the time to break even make it not worthwhile in most cases.
- Your vehicle has high mileage or age. Many lenders restrict refinancing based on the vehicle's age (usually under 10 years) and mileage (often under 100,000–125,000 miles).
- Your rate difference is small (<1%). Below about 1 percentage point, the monthly savings often don't cover fees quickly enough to be worth the hassle.
- Your loan has a prepayment penalty. Read your current loan agreement. A prepayment penalty (rare but possible) changes the break-even significantly.
- You're underwater and want to roll negative equity. Refinancing to add negative equity to a new loan increases your balance, not your equity, and can compound a bad situation.
Where to refinance
Get quotes from at least three sources before committing:
- Your bank or credit union. Credit unions in particular often offer competitive auto loan rates to members.
- Online lenders. LightStream, MyAutoloan, and others specialize in auto refinancing and can provide rates quickly.
- The current lender. Some lenders will modify an existing loan at a new rate, which can reduce or eliminate title-transfer fees.
Apply within a short window (14–30 days) to minimize credit-score impact from multiple hard inquiries.
The process
- Check your current payoff amount (call your lender — this may differ from your balance because it includes remaining interest)
- Pull your credit report and score
- Get quotes from 3+ lenders
- Calculate break-even with the refinance calculator
- If it makes sense, complete the application, provide your current loan account number, and arrange title transfer
- Confirm the old loan is fully paid off after the new loan funds
Frequently asked questions
When should you refinance an auto loan?
Refinancing makes the most sense when: interest rates have dropped since you took your original loan; your credit score has improved significantly (improving your rate eligibility); you originally financed through a dealer at a marked-up rate; or you want to change your loan term (shorter to save interest, or longer to reduce monthly payment as a cash-flow measure).
How much can you save by refinancing a car loan?
On a $25,000 balance at 8.9% APR refinanced to 5.9% APR over 36 months, you'd save roughly $120/month and about $2,000 in total interest over the remaining term. The exact savings depend on your balance, rate difference, and new term.
Does refinancing hurt your credit score?
Refinancing causes a hard credit inquiry, which typically reduces your score by 5–10 points temporarily. If you're rate shopping (applying at multiple lenders within 14–45 days), credit bureaus typically count multiple inquiries as one. The long-term effect on your credit is usually minimal.
How soon can you refinance after buying a car?
Most lenders require at least 60–90 days before refinancing a new loan. Some require 6 months. Additionally, your credit report needs time to reflect the new loan before another lender can see it. If you financed through a dealer at a high rate, 3–6 months is typically the earliest practical window to refinance.
Keep reading
Get the car ownership cost checklist
A free, plain-English guide to every cost you'll face owning a car — plus occasional updates when state registration fees or tax rules change. No spam. Unsubscribe anytime. We never share your email.