Car Refinance Calculator

Compare your current auto loan with a refinance offer, including monthly payment change, total interest difference, all-in savings after fees, and break-even timing.

Current auto loan

Refinance offer

Display currency

Change the displayed currency without altering the loan comparison math.

Comparison

$29.95 higher

Estimated monthly payment change if the remaining balance is refinanced under the new term and fee assumptions.

Interest savings before fees
$1,424.31
All-in savings after fees
$974.31
Break-even point
N/A
Refinance fees
$450.00
CurrentRefinance
Monthly payment$447.08$477.03
Payoff term4 years3 yr 6 mo
Total interest$3,459.67$2,035.36
All-in cost$21,459.67$20,485.36

How to read this

Break-even tells you how long it takes for lower monthly payments to recover the refinance fees. All-in savings matters more than monthly savings alone if the new term is longer.

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Auto Loans

Car refinance calculator guide: compare your current auto loan with a refinance offer

A car refinance calculator compares the remaining cost of your current auto loan with a new refinance offer on the same remaining balance. This version asks for the balance left, current APR, months remaining, refinance APR, refinance term, and refinance fees so you can see monthly payment change, interest savings before fees, all-in savings after fees, and whether a monthly-payment break-even point even exists.

What this refinance comparison is testing

Refinancing a vehicle loan can help in more than one way. Some borrowers want a lower monthly payment, some want to cut total interest, and some want both. Those goals do not always move together. A shorter refinance term can reduce total interest while still raising the monthly payment, which is why a truthful refinance comparison has to show more than one headline number.

This calculator keeps the remaining balance the same in both paths and compares the current loan with one refinance scenario. It then surfaces the two questions that matter most: does the refinance reduce the all-in remaining cost once fees are included, and does it reduce the monthly payment enough for a break-even month to make sense?

Core refinance maths

Both sides of the comparison use the standard fixed-rate amortising-loan payment formula. The current-loan side uses the entered remaining balance, APR, and months left. The refinance side uses the same balance with the new APR and new term, then adds the refinance fees as an extra cost on top of the repayment stream.

That design lets the page separate payment change from lifetime cost change. If the refinance payment is lower, the calculator can estimate a payment-based break-even month by comparing monthly savings with fees. If the refinance payment is higher, the break-even line is not meaningful even if the refinance still cuts total interest and all-in cost.

Monthly payment = P x r / (1 - (1 + r)^(-n))

P is the remaining balance, r is the monthly interest rate, and n is the remaining number of monthly payments.

Interest savings before fees = Current-loan interest - Refinance-loan interest

This isolates the rate-and-term effect before refinance fees are layered on.

All-in savings after fees = Current remaining cost - (Refinance remaining cost + fees)

This is the cleaner lifetime comparison when you want to know whether refinancing actually lowers the remaining cost.

Worked example: 18,000 remaining with a shorter refinance term

Suppose 18,000 remains on the current loan at 8.9% with 48 months left. Compare that with a refinance offer at 6.1% for 42 months with 450 in fees. In this calculator, the current payment is about 447.08 per month and the refinance payment is about 477.03 per month.

Even though the new payment is about 29.96 higher each month, the shorter and cheaper refinance path still reduces remaining interest from about 3,459.67 to about 2,035.36. After adding the 450 fee, the refinance still lowers the all-in remaining cost by about 974.31. Because the payment rises rather than falls, there is no monthly-savings break-even month in this example.

What this estimate excludes

This page is a fixed-rate planning comparison only. It does not model negative equity rolled into the new loan, lender approval odds, cash-out refinancing, gap coverage, late fees, title or registration charges beyond the entered fee total, or any temporary payment deferral structure.

Use it to compare one current loan against one refinance offer on the same remaining balance. Before signing, confirm the exact APR, fees, payoff amount, and any prepayment terms in the lender disclosures.

Further reading

Frequently asked questions

Why can a refinance still save money if the monthly payment is higher?

A lower rate and shorter remaining term can reduce total interest even when the monthly payment rises. That is why the all-in remaining cost matters more than monthly payment alone.

 Does this calculator include negative equity or cash-out refinancing?

No. It compares one refinance offer on the same remaining loan balance. Rolling negative equity into the new loan or taking cash out would require a different model.

 What if my lender charges extra title, filing, or payoff fees?

Add those costs to the refinance-fee input before relying on the result. The fee field is meant to capture the upfront costs that change the all-in comparison.

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