Free auto refinance savings calculator
Enter your remaining balance, current APR, and new rate — this auto refinance calculator shows monthly savings, total savings, and the break-even point in months, updated live, as you type.
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Does not account for prepayment penalties on current loan. Check your current loan terms before refinancing.
Results are estimates. Consult a professional.
How the auto refinance savings calculator works
Refinancing replaces your existing auto loan with a new one at a different rate, term, or both. The calculator computes how much you'll pay under each scenario and subtracts any refinancing fees to give you the true net savings. You can choose to lower your monthly payment, reduce your total interest paid, or both.
Refinancing is most valuable early in the loan term when most of the remaining balance is principal and there's ample time for the lower rate to compound. Refinancing in the final 12 months of a loan typically produces minimal savings relative to the effort and any fees involved.
Experian State of the Automotive Finance Market Q4 2024; LendingTree auto refi guideWorked example: dropping from 10% to 6.5% on a $20,000 balance
Current balance: $20,000. Current APR: 10%. Current monthly payment: $507.25. Months remaining: 48. New APR: 6.5%. New term: 48 months. Refinancing fee: $200.
Monthly savings from refinancing: 48-month term, from 9%/10% to 6%/7%
The table below shows estimated monthly payment reductions when refinancing various balances from a high rate to a lower rate, keeping a 48-month term. Figures exclude fees. A 2-percentage-point drop consistently saves $18–$28 per $10,000 of balance per month.
| Remaining Balance | From 9% → 6% (monthly savings) | From 9% → 7% (monthly savings) | From 10% → 6% (monthly savings) |
|---|---|---|---|
| $15,000 | $37/mo | $22/mo | $47/mo |
| $20,000 | $49/mo | $29/mo | $63/mo |
| $25,000 | $61/mo | $37/mo | $79/mo |
Source: Experian 2024; LendingTree auto refi data. Standard amortization formula; figures rounded to nearest dollar.
Average auto refinance savings reported by LendingTree in 2024 were $60–$150 per month, consistent with borrowers who originally financed at dealer-arranged rates of 8–12% and later qualified for credit-union or bank rates of 5–7%.
Tips for a successful auto loan refinance
Refinancing an auto loan is simpler than refinancing a mortgage — most applications take 15 minutes and can close within 24–48 hours. But timing and preparation matter. Here's what to check before you apply.
- Refinance in the first 12–18 months — that's when most of the remaining balance is still principal and the new lower rate has the most time to reduce interest accumulation. After the midpoint of the loan, interest savings shrink rapidly.
- Check that you have equity — lenders typically require the loan-to-value (LTV) ratio to be 125% or below. If you owe more than the car is worth, you may need to wait or make extra payments before refinancing.
- Aim for a credit score of 720+ — a score improvement of even 30–40 points since origination can unlock a significantly lower rate. Pull your free Experian or Equifax report first to check for errors that may be suppressing your score.
- Compare at least 3 lenders — credit unions (including online credit unions such as PenFed and DCU) routinely offer rates 1–2 percentage points lower than dealer-arranged financing. Multiple rate inquiries within a 14-day window count as a single hard inquiry under FICO scoring.
- Watch the term extension trap — extending from 24 remaining months to a new 48-month term will lower your monthly payment but dramatically increase total interest paid. If possible, match or shorten the remaining term when you refi.
Accuracy and limitations
This calculator uses standard amortization math. Results match your lender's payment schedule within a few dollars when you enter the exact current payoff balance (not the original loan amount), the new APR, and the new term. Use your lender's official payoff quote for a precise balance — statements may show a balance that excludes accrued daily interest.
The calculator does not factor in the tax deductibility of auto loan interest (generally only available for business-use vehicles), title transfer fees that some states charge on refinances ($15–$75), or GAP insurance that may need to be repurchased through the new lender. If your existing loan includes a dealer-sold credit insurance product, refinancing typically terminates it — factor in any refund against the new loan cost.
Auto refinance terms defined
About this auto refinance savings calculator
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