Affiliate disclosure: This page contains affiliate links. We may earn a commission if you click through and take action, at no extra cost to you. Learn more.
Car Refinance Loan Calculator
Enter your current loan balance, rate, and a refinance auto loan offer to see exactly how much you'd save and whether the switch is worth it.
Sources & Methodology
- Federal Reserve (FRED), Average Finance Rate on Consumer Installment Loans — 48-Month New Car Loan
- CFPB Auto Loans Resource, guidance on understanding auto loan terms, dealer markups, and refinancing
- Credit Karma, auto refinance rate data and credit score impact analysis
- Experian, State of the Automotive Finance Market — average auto loan rates by credit tier
By Sean Baldwin · Last reviewed July 2026
Frequently Asked Questions
When does it make sense to refinance a car loan?
Refinancing makes sense when you can lower your interest rate by at least 1–2 percentage points, your credit score has improved since you took out the original loan, or interest rates have dropped since you financed. The sweet spot is within the first 1–3 years of your loan, when a significant portion of each payment is still going to interest rather than principal. If you financed at a dealership, particularly through a manufacturer's captive lender or with a dealer-arranged rate, there is a reasonable chance you were charged above the rate your credit actually qualified for, making you a good candidate for refinancing.
How much can I actually save by refinancing my car?
On a $20,000 loan with 48 months remaining, dropping from 9% to 5.5% saves about $68 per month and roughly $3,260 in total interest over the remaining term. On a $30,000 balance with 60 months remaining, the same rate drop saves around $90 per month and $5,400 in total interest. The exact amount depends on your balance, current rate, new rate, and whether you keep the same term or extend it. Using the calculator above gives you the exact numbers for your situation rather than a rough estimate.
Does refinancing a car loan hurt your credit?
Yes, temporarily. When you apply for a refinance, the new lender does a hard inquiry on your credit, which typically drops your score 5–10 points for a few months. If you're rate shopping with multiple lenders, credit bureaus treat multiple auto loan inquiries within a 14–45 day window as a single inquiry for scoring purposes, so apply to multiple lenders quickly rather than spacing them out. The longer-term credit impact is neutral to slightly positive: a new account lowers your average account age briefly, but consistent on-time payments on the refinanced loan rebuild your score within 6–12 months.
How long does it take to refinance a car loan?
Most auto refinances close within 2–7 business days. Online lenders and credit unions are typically the fastest; banks and dealer networks tend to be slower. The process involves submitting an application, providing proof of income, insurance, and your vehicle's title or VIN, then the new lender pays off your old loan directly. You make your first payment to the new lender roughly 30 days after closing. The title transfer happens automatically in most states. The whole process requires maybe 30–60 minutes of your actual time.
Can I refinance a car loan with the same lender?
Some lenders allow it, but many do not, since refinancing at a lower rate means less profit for them. It is worth asking, particularly if you have a good payment history with them. If your current lender won't refinance at a lower rate, that's a clear signal to shop elsewhere. Credit unions typically offer the most competitive auto refinance rates and are more willing to work with existing borrowers than traditional banks.
What credit score do I need to refinance a car loan?
Most lenders require a minimum credit score of 600–640 for auto refinancing, but the best rates go to borrowers with scores of 720 or higher. If your score is below 640, you may qualify but at a rate close to or above your current one, making refinancing pointless. If your score has improved significantly since you took out the original loan, that's one of the strongest signals that refinancing will save you meaningful money. A jump from 620 to 700, for example, can lower your offered rate by 3–5 percentage points on a typical auto loan.
Is it worth refinancing a car loan with only 1 year left?
Probably not. With 12 months remaining, most of your loan's interest has already been paid because auto loans are front-loaded: the early payments go heavily toward interest, and the later payments are mostly principal. Refinancing at this stage saves only the interest on the remaining balance, which is a small number, and adding any origination fees or closing costs often wipes out the benefit entirely. As a rough rule, refinancing makes the most financial sense when you have at least 24–36 months remaining on the loan.
The 1% rule: a starting point, not a guarantee
A commonly cited rule is that refinancing is worth it if you can lower your rate by at least 1 percentage point. That is a reasonable starting point, but the actual math depends on your balance and remaining term. On a $30,000 loan with 48 months left, a 1% rate reduction saves about $22/month and roughly $1,060 in total interest — meaningful, but not dramatic. On a $10,000 loan with 18 months left, the same rate drop saves under $10/month and about $150 total — barely worth the paperwork. The calculator gives you the exact numbers for your situation. The rule of thumb just tells you whether it is worth checking.
The term extension trap: lower payment, more total interest
The most common refinancing mistake is extending the loan term to get a lower monthly payment without realizing it costs more money overall. If you have 36 months left on your current loan and refinance into a new 60-month loan, your payment drops significantly — but you are paying interest for 24 extra months on a depreciating asset. It is entirely possible to get a lower interest rate and still pay more total interest than you would have if you had stayed with the original loan. The calculator flags this scenario specifically. If you want to lower your monthly payment without extending the term, pay a lump sum toward the principal first, then refinance the smaller remaining balance.
Why dealership financing is often overpriced
When you finance through a dealership, the dealer typically arranges the loan through a third-party lender and earns a markup on the interest rate — called the dealer reserve. The lender offers the dealer a buy rate (the lowest rate your credit qualifies for), and the dealer is allowed to charge you more, often 1–2.5 percentage points above the buy rate, keeping the difference as profit. This is legal and common. It is one of the main reasons people who financed through a dealership, especially during the 2021–2023 period when rates moved fast, find they are now paying above-market rates. If you financed at a dealership, it's worth shopping your loan even if rates haven't dropped, because your original rate may have had margin built in.
Credit unions vs. banks vs. online lenders: where to get the best rate
Credit unions consistently offer the lowest auto refinance rates, often 1–2% below what traditional banks quote for equivalent credit profiles, because they return profits to members rather than shareholders. The catch: you have to be a member, and many have geographic or employer-based eligibility requirements. Online lenders like LightStream, PenFed (technically a credit union but open to anyone), and myAutoloan aggregate offers from multiple lenders in a single application, making them the most efficient starting point for comparison. Traditional banks tend to be competitive only for existing customers with strong relationships. The fastest path to the best rate is to get pre-approved online from 2–3 sources within the same week, which keeps the credit impact to a single inquiry.
When not to refinance: red flags to watch for
A few scenarios where refinancing typically does not make sense: (1) your current loan has a prepayment penalty, which some lenders charge if you pay off the loan early — read your original loan documents before applying; (2) your vehicle is old enough or high-mileage enough that lenders won't touch it, most lenders won't refinance vehicles over 10 years old or with more than 100,000–125,000 miles; (3) you're underwater on the loan, meaning you owe more than the car is worth, some lenders will still refinance in this situation but at a higher rate; and (4) you plan to sell or trade the vehicle within the next 12 months, in which case the paperwork and hard inquiry rarely justify the marginal savings.
Related Calculators
Further Reading
How We Calculate Your Score
The Worth It Score starts at 50 and adjusts based on three factors: how much your rate drops, your monthly savings, and how quickly you break even on any fees. A bigger rate cut with fast break-even and meaningful monthly savings pushes the score toward 100; a rate increase or near-zero savings keeps it low.
- · Base score: 50
- · Rate reduction: 2%+ adds 30 points; 1–2% adds 20 points; 0.5–1% adds 10 points; any positive reduction adds 5 points
- · Monthly savings: over $200/mo adds 15 points; over $100/mo adds 10 points; over $50/mo adds 5 points
- · Break-even: under 12 months adds 10 points; under 24 months adds 5 points; over 36 months subtracts 5 points
- · Penalty: if net savings over the remaining term are negative, subtracts 15 points
Score reflects financial benefit of refinancing, not overall loan affordability. A longer loan term can lower your payment but increase total interest paid — check both your monthly savings and your total cost.
Cite this calculator: Worth It Calculators, "Is Refinancing Your Car Loan Worth It Right Now? (2026 Calculator)," worthitcalculators.com/auto-refinance/ (updated July 2026).