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Auto Refinance Calculator: Should You Refinance Your Car?

Compare your current car loan to a new one — monthly savings, lifetime savings and the break-even on fees.

Updated July 23, 2026More auto & car finance tools

Your numbers

Current loan
New loan

Title/lien fees, if any. Often $0.

Monthly savings

$31

New payment
$522
Current payment
$553
Interest saved
$1,487
Lifetime savings
$1,487
Break-even
0 mo
New total interest
$3,043

Where it goes

  • Interest (current)60%
  • Interest (new)40%

Your personalized analysis

Summary

Refinancing lowers your payment by $31 a month

Your current loan is $553 a month with $4,530 of interest left. A new loan at 6.50% over 48 months would be $522 a month, saving $31 monthly. On interest alone, refinancing saves $1,487.

Next step

Refinancing works best when your credit has improved

The biggest auto-refinance wins come when your credit score has risen since you bought, or when rates have fallen. If you financed at the dealer, you may also have been marked up — a direct lender or credit union often beats it. Check your score before applying.

Credit score simulator

Example calculations

Worked scenarios with the full analysis, so you can see how the numbers move before entering your own.

$22,000 at 9.5% refinanced to 6.5%

A borrower who qualified at a high rate refinancing after their credit improved, keeping the same term.

Monthly savings

$31

New payment
$522
Current payment
$553
Interest saved
$1,487
Lifetime savings
$1,487
Break-even
0 mo
New total interest
$3,043
Summary

Refinancing lowers your payment by $31 a month

Your current loan is $553 a month with $4,530 of interest left. A new loan at 6.50% over 48 months would be $522 a month, saving $31 monthly. On interest alone, refinancing saves $1,487.

Next step

Refinancing works best when your credit has improved

The biggest auto-refinance wins come when your credit score has risen since you bought, or when rates have fallen. If you financed at the dealer, you may also have been marked up — a direct lender or credit union often beats it. Check your score before applying.

Credit score simulator

Same loan but stretching to 72 months

Lowering the payment by extending the term — which cuts the monthly but can raise total interest.

Monthly savings

$183

New payment
$370
Current payment
$553
Interest saved
-$97
Lifetime savings
-$97
Break-even
0 mo
New total interest
$4,627
Summary

Refinancing lowers your payment by $183 a month

Your current loan is $553 a month with $4,530 of interest left. A new loan at 6.50% over 72 months would be $370 a month, saving $183 monthly. On interest alone, refinancing costs $97 more.

Watch out

A lower payment here comes from stretching the term, not saving

The new term (72 months) is longer than what's left on your current loan (48 months). That lowers the monthly payment but you'd actually pay $97 more in total interest. Refinancing only truly saves money if the interest drops — match or shorten the term to capture the rate cut without extending the loan.

Next step

Refinancing works best when your credit has improved

The biggest auto-refinance wins come when your credit score has risen since you bought, or when rates have fallen. If you financed at the dealer, you may also have been marked up — a direct lender or credit union often beats it. Check your score before applying.

Credit score simulator

$14,000 at 12% to 7%

A significant rate drop on a smaller balance, common after a year of on-time payments.

Monthly savings

$33

New payment
$432
Current payment
$465
Interest saved
$1,178
Lifetime savings
$1,178
Break-even
0 mo
New total interest
$1,562
Summary

Refinancing lowers your payment by $33 a month

Your current loan is $465 a month with $2,740 of interest left. A new loan at 7% over 36 months would be $432 a month, saving $33 monthly. On interest alone, refinancing saves $1,178.

Next step

Refinancing works best when your credit has improved

The biggest auto-refinance wins come when your credit score has risen since you bought, or when rates have fallen. If you financed at the dealer, you may also have been marked up — a direct lender or credit union often beats it. Check your score before applying.

Credit score simulator

A refinance with $150 in fees

A loan with modest lien-transfer fees, showing the break-even calculation.

Monthly savings

$22

New payment
$488
Current payment
$510
Interest saved
$1,076
Lifetime savings
$926
Break-even
7 mo
New total interest
$2,332
Summary

Refinancing lowers your payment by $22 a month

Your current loan is $510 a month with $3,408 of interest left. A new loan at 6.90% over 42 months would be $488 a month, saving $22 monthly. On interest alone, refinancing saves $1,076.

Recommendation

You'd break even on the $150 fees in 7 months

Refinancing costs $150 upfront, recovered by your monthly savings after about 7 months. As long as you keep the car and loan past that point, the refinance pays off. Many auto refinances have no fees at all, which makes the decision simpler.

Next step

Refinancing works best when your credit has improved

The biggest auto-refinance wins come when your credit score has risen since you bought, or when rates have fallen. If you financed at the dealer, you may also have been marked up — a direct lender or credit union often beats it. Check your score before applying.

Credit score simulator

The basics

When refinancing a car loan makes sense

Refinancing replaces your current car loan with a new one, ideally at a lower interest rate. The best time is when your credit score has improved since you bought, when market rates have fallen, or when you financed at the dealer and got marked up. Even a two- or three-point rate drop can save hundreds or thousands over the remaining loan.

The key is to lower the rate without extending the term. Stretching a nearly-paid-off loan back out to 60 or 72 months lowers the monthly payment but can increase total interest even at a lower rate — because you're paying interest for longer. Keep the same or a shorter term to capture the rate savings cleanly.

  • Best when your credit improved or rates dropped
  • Lower the rate without extending the term
  • Auto refinances often have no fees
  • Check for prepayment penalties on the old loan (rare)

Going deeper

The traps to avoid

The most common mistake is judging a refinance by the monthly payment alone. Dealers and lenders can always lower the payment by lengthening the term, which feels like savings but often isn't. Compare total interest, which this calculator shows, not just the payment.

Also watch being underwater: if you owe more than the car is worth, some lenders won't refinance, or will require you to bring cash. And avoid refinancing very late in a loan — with little balance and interest left, the savings rarely justify the effort. Refinancing pays off most in the first half of a high-rate loan.

Common mistakes

  1. 1

    Judging by the monthly payment

    A lower payment from a longer term isn't savings. Compare total interest, not just the monthly figure.

  2. 2

    Extending the term unnecessarily

    Stretching a near-paid loan back to 60+ months can raise total interest even at a lower rate.

  3. 3

    Not shopping multiple lenders

    Credit unions and direct lenders often beat dealer rates. Rate-shop within a short window to limit credit impact.

  4. 4

    Refinancing too late in the loan

    With little balance and interest left, the savings rarely justify the effort. Refinance early in a high-rate loan.

  5. 5

    Ignoring being underwater

    Owing more than the car's worth limits refinance options. Build equity first if you're upside down.

Common questions

Is it worth refinancing my car loan?

It's worth it when you can meaningfully lower the interest rate without extending the term, and you'll keep the car past any break-even on fees. A rate drop of two points or more — common after credit improves or if you financed at the dealer — often saves hundreds to thousands. Enter your numbers to see the exact savings.

Does refinancing a car hurt my credit?

Only slightly and temporarily. The application creates a hard inquiry that may dip your score a few points, and opening a new loan lowers your average account age. Both recover quickly, and rate-shopping multiple lenders within a short window counts as a single inquiry. The interest savings usually far outweigh the small dip.

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

It's harder. Being underwater (owing more than the car's value) means a high loan-to-value ratio, and some lenders won't refinance or will require you to pay down the gap. If you're only slightly underwater, a credit union may still work with you. Otherwise, waiting until you have more equity improves your options and rate.

Should I extend my loan term when refinancing?

Usually not, if your goal is to save money. Extending the term lowers the monthly payment but can increase total interest even at a lower rate. Refinance to the same or a shorter term to capture the rate cut cleanly. Only extend if you specifically need lower monthly payments for cash-flow reasons and accept the extra interest.

How soon can I refinance a car loan?

Often within a few months of buying, though it's worth waiting until you have some payment history and, ideally, an improved credit score. There's no universal waiting period, but the title needs to be processed first. The sweet spot is early in a high-rate loan, once your credit has had time to strengthen.

Glossary

Refinance
Replacing an existing loan with a new one, ideally at a lower interest rate.
APR
Annual percentage rate — the yearly cost of the loan including fees.
Break-even
The point where accumulated monthly savings recover any refinance fees.
Underwater
Owing more on the car than it is currently worth, which can block a refinance.
Loan-to-value
The loan balance divided by the car's value; lower ratios get better refinance rates.
Term
The number of months over which the loan is repaid.

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