Auto Loan Refinance Calculator

Enter your current loan details and a rate you have been quoted by a new lender. The calculator shows your monthly savings, total interest saved over the remaining term, and how many months it takes to break even on any refinance fees.

Methodology: Calculations use standard amortization formulas. Results are estimates based on the numbers you enter and do not account for state-specific taxes or variable rate changes.

What the Calculator Shows You

The calculator compares your current loan against a new one and gives you four numbers that actually matter.

Monthly savings tells you how much less you would pay each month under the new loan. Total interest saved shows the full difference in what you pay the lender over the remaining term. Break-even months tells you how long it takes for the monthly savings to cover any upfront refinance fees. Net benefit after fees is the number that tells you whether the refinance is genuinely worth doing, not just whether the monthly payment looks lower.

That last one matters because a lower monthly payment is not always a better deal. If you extend the term to get a lower payment, you might save $40 a month but pay $900 more in total interest. The net benefit catches that.

Is Refinancing Your Car Loan Worth It?

It depends on three things.

The rate difference. If a lender is offering you a rate at least 1.5 to 2 percentage points below what you currently have, the math usually works out. Smaller differences can still be worth it on larger balances, but run the numbers first rather than assuming.

Your credit score since the original loan. If your score has gone up since you financed the car, you may qualify for a better rate tier now than you did at the dealership. A 50-point improvement can mean a 2 to 3 point difference in APR with a different lender.

Your loan-to-value ratio. Lenders look at how much you owe relative to what the car is currently worth. If you owe significantly more than the car is worth, most prime lenders will not approve the refinance until that gap narrows. Check your LTV before you apply anywhere.

The simplest test is the break-even calculation. Divide your total refinance fees by the monthly savings. If that number is smaller than how many months you plan to keep the car, the refinance almost certainly makes sense.

What Lenders Check When You Apply

Before you apply anywhere, it helps to know what lenders are actually looking at.

Most lenders want a credit score of at least 660 to offer their competitive rate tiers. Below that, you will still find lenders willing to work with you, but the rates go up considerably and the lender options narrow.

On loan-to-value, most prime lenders want you to owe no more than the car is worth, or close to it. Some will go up to 120 percent LTV, meaning you owe 20 percent more than the vehicle’s current value. Above that, options become limited.

Vehicle age and mileage matter too. Most lenders will not refinance cars older than 10 years or with more than 100,000 to 150,000 miles. The closer your car gets to those numbers, the fewer lenders will be willing to touch it.

How to Refinance Your Car Loan

Once the calculator shows the refinance makes financial sense, the process itself is straightforward.

Get a written payoff quote from your current lender. This is not the balance showing in your app. It is the exact figure your lender needs to receive to close the loan today, including any interest that has accrued since your last payment. Most lenders provide this over the phone or through their online portal.

Get quotes from at least three lenders. One credit union, one online lender, and one bank gives you a real picture of what the market will offer for your specific profile. Ask each one for their full fee breakdown and whether they offer a rate lock.

Run the break-even calculation with actual numbers. Use the calculator above with your real payoff figure and the exact fees each lender is quoting you, not estimates.

When you find an offer that makes sense, submit the full application. The new lender pays off the old one directly. Once that clears, you start making payments to the new lender at the new rate. Your car does not move and your ownership does not change throughout the process.

FAQ

Can I refinance if I owe more than my car is worth?

Yes, but it is harder. Most lenders cap the loan amount at around 110 to 120 percent of the vehicle’s current value. If you are above that, you may need to make a lump sum payment toward the principal to bring the balance down before a lender will approve it.

Does making extra payments help my break-even?

Yes. Extra payments reduce your principal faster, which lowers the interest charged each month going forward. Consistent extra payments can shorten your break-even period by several months and reduce total interest significantly.

How often can I refinance?

There is no legal limit. But refinancing too frequently means paying fees multiple times and restarting the interest front-loading each time. It generally makes sense to wait until your credit score or market rates have moved enough to justify a new round of fees.

What do I need to use the calculator?

Your current loan balance, your current APR, how many months are left on the loan, and the new APR you have been quoted. If you have a fee estimate from a lender, enter that too for an accurate break-even number.

When does refinancing make the most sense?

When your credit score has improved by 50 or more points since you originally financed, or when market rates have dropped at least 1.5 to 2 percent below your current rate. Earlier in the loan term is generally better because more of the interest is still ahead of you.

What documents do I need to apply?

A valid driver’s license, your vehicle registration, the VIN number, and a payoff statement from your current lender. Most lenders will also ask for recent proof of income.

Are there fees involved in refinancing?

Yes. Common fees include title transfer fees, origination fees, and sometimes a prepayment penalty on the old loan. Enter these in the calculator’s refinance fees field to see how they affect your break-even period.

What is a good refinance rate right now?

It depends on your credit score. Borrowers above 720 are currently seeing rates roughly between 5 and 7 percent. Borrowers in the 640 to 680 range typically see rates between 8 and 12 percent. Rates vary by lender, vehicle age, and loan term.

Can I refinance with my current lender?

Most lenders will not offer you a lower rate on an existing loan you already have with them. To get a meaningfully better rate you generally need to move to a new lender. Some banks make exceptions for existing customers but it is not a common practice.

What is the Rule of 78s?

It is an older interest calculation method that front-loads interest more heavily than standard simple interest. Some older or subprime loan contracts still use it. If your loan uses the Rule of 78s, refinancing is harder to make work mathematically. Check your original loan documents for any mention of it or of prepayment penalties.

What is a cash-in refinance?

It means making a lump sum payment toward your principal when you refinance, to reduce your loan-to-value ratio. If you owe more than the car is worth, this can move you into a better approval tier and unlock lower rates.

Does refinancing affect my title?

Yes. When you refinance, your current lender releases the lien on the vehicle and the new lender files a new one. Your ownership does not change but there is a title transfer process involved, and usually a small fee that should be factored into your break-even calculation.