Compare your current auto loan with a refinance offer, including monthly payment change, interest savings, fees, payoff timing, holding-period savings.
Finance planning estimate
Topic review: Michael Brennan
Small Business Finance Writer. Assigned as the finance topic reviewer for tax, debt, repayment, payroll, and business-finance calculators.
Auto refinance comparison Compare the payment, interest, fees, payoff term, and planned holding-period cost of keeping your current auto loan versus taking a refinance offer.
Display currency
Choose the currency used for your balance, fees, and refinance quote before entering money values.
Offer examples
Current auto loan
Refinance offer
Fee treatment
Result
$23.52 lower
Estimated monthly payment change if the payoff balance is refinanced under the entered APR, term, and fee treatment.
Interest savings before fees
$1,128.97
All-in savings after fees
$678.97
Savings over your hold period
$593.08
Break-even point
1 yr 8 mo
Payoff timing change
Same term
Current loan
Refinance offer
Principal compared
$18,000.00
$18,000.00
Monthly payment
$447.08
$423.56
Payoff term
4 years
4 years
Total interest
$3,459.67
$2,330.70
Fees paid upfront
N/A
$450.00
Fees financed
N/A
$0.00
All-in cost to maturity
$21,459.67
$20,780.70
Holding-period check
Months tested
36
Current balance then
$5,114.99
Refinance balance then
$4,918.64
This holding-period view counts payments made plus the remaining payoff balance at month 36. It is useful when you may sell, trade in, or refinance again before either loan reaches maturity.
How to read this
Break-even tells you how long lower monthly payments take to recover refinance fees. All-in savings and holding-period savings matter more than monthly savings alone when the new term is longer or fees are financed into the new balance.
Car refinance calculator guide: compare auto loan refinance payments, fees, terms
A car refinance calculator compares the remaining cost of your current auto loan with a new refinance offer on the same payoff balance. This page also explains the main assumptions behind the car refinance calculator result, highlights the supporting figures shown by the calculator, and helps the reader use the estimate without overstating what a quick online tool can prove.
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?
The calculator also separates payment relief from payoff timing. A refinance that stretches a 48-month remaining loan to 72 months may lower the monthly payment, but it can keep the debt outstanding longer and leave a higher payoff balance if you sell or trade the car before maturity. The holding-period view is designed to catch that risk.
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.
Fees can be treated as paid upfront or financed into the new balance. Paying fees upfront raises the cash cost immediately. Financing fees can make the upfront cost feel easier, but the financed fee becomes principal and accrues interest for as long as the new loan remains open.
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.
Holding-period cost = Payments made through month h + payoff balance at month h + upfront refinance fees
This compares the two paths when you expect to sell, trade in, or refinance again before the loan reaches maturity.
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.
Now compare a different offer that lowers the payment by stretching the term. The monthly number may look better, but the holding-period payoff balance can be higher because the new loan amortises more slowly. That is why the calculator shows all-in savings, planned holding-period savings, and payoff timing rather than treating the lowest monthly payment as automatically best.
How to use the holding-period and fee-treatment checks
The expected holding period asks how long you realistically plan to keep the car or this loan before selling, trading in, paying it off, or refinancing again. For each path, the calculator totals the payments made through that month and the remaining payoff balance at that month. That gives a cleaner comparison when you are unlikely to keep either loan to the final payment.
The fee-treatment choice should match the refinance offer. If the lender expects you to pay title, application, or documentation charges in cash, use the upfront option. If those costs are rolled into the new loan amount, use the financed-fees option so the payment, total interest, and future payoff balance include them.
This is especially important for borrowers comparing an auto refinance calculator, vehicle refinance calculator, or car loan refinance calculator result against an actual lender quote. The same APR and term can produce different results depending on whether fees are paid today or added to the amount financed.
What to compare before accepting an auto refinance offer
Start with APR, remaining balance, term length, fees, and monthly payment, then move beyond the payment number. Compare the total remaining interest, all-in cost after fees, payoff timing, and whether the new loan leaves you with a higher balance during the period you expect to keep the vehicle.
A strong refinance offer usually improves at least one primary goal without quietly damaging another. If the goal is lower monthly payment, check the all-in cost and term extension. If the goal is lower interest, check whether the monthly payment still fits your budget. If the goal is short-term cash-flow relief, check whether financed fees and slower principal reduction create a higher future payoff.
Also confirm the current payoff amount directly with the existing lender. A payoff quote can differ from the last statement balance because interest accrues daily, and some contracts include administrative fees or prepayment terms.
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.
The calculator does not decide whether you will qualify. Lenders can consider credit profile, vehicle age, mileage, loan-to-value ratio, income, and their own underwriting rules. Treat the output as a planning comparison that helps you ask better questions before relying on a formal refinance quote.
Further reading
CFPB — Auto loans — Official CFPB resource hub for understanding auto-loan terms, shopping, and refinance-related decisions.
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.
Should I pay refinance fees upfront or finance them?
Use the treatment that matches the lender quote. Paying fees upfront makes the cost visible immediately and keeps the new principal lower. Financing fees can reduce cash due today, but those fees become part of the loan balance and can increase payment, interest, and the payoff balance if you sell or refinance again.
Why does the holding-period savings number matter?
Many borrowers do not keep a refinanced car loan until the final payment. The holding-period view compares payments made plus the remaining payoff balance at the month you choose. That can reveal a refinance that looks good at maturity but leaves you worse off if you trade in the vehicle sooner.
Is the lowest monthly payment always the best refinance option?
No. A lower payment can come from a lower APR, a longer term, financed fees, or some combination of those factors. A longer term may improve cash flow while increasing total cost or slowing principal reduction, so compare all-in savings, payoff timing, and holding-period savings before deciding.
What is a break-even month for a car refinance?
The break-even month is the point where cumulative monthly payment savings have recovered the refinance fees. It is most meaningful when the refinance lowers the monthly payment. If the refinance raises the payment but lowers total interest, the decision should be based on affordability and all-in savings instead.
What payoff balance should I enter?
Use the current lender's payoff amount if available, not just the last statement balance. Payoff quotes can include interest through a specific date and may differ from the balance shown on a recent statement.
Can I use this calculator for negative equity?
Only if the refinance offer is on the same payoff balance you enter. If you are rolling negative equity, cash-out proceeds, add-ons, or other debt into the new loan, the model will understate or misstate the true refinance comparison unless those amounts are included in the balance and fees in a way that matches the offer.
Does the calculator account for lender approval or vehicle value limits?
No. It compares the math of one current loan and one refinance offer. Actual approval can depend on credit profile, income, vehicle age, mileage, loan-to-value limits, and lender-specific underwriting rules.
How is a car refinance calculator different from a regular auto loan calculator?
A regular auto loan calculator usually starts with a purchase price or amount financed for a new deal. A car refinance calculator starts with the payoff balance on an existing loan and compares the remaining cost of keeping that loan with the cost of replacing it.
