FinanceCalcs
Car Refinance Calculator
Find out if refinancing your auto loan saves you money. Compare your current loan to a new offer and see monthly savings, total interest saved, and break-even month.
Enter your current loan and a new rate offer — get a full side-by-side comparison instantly.
Car Refinance Calculator
Monthly Savings: $0
- Current Loan
- New Loan
"The best time to refinance was when rates dropped. The second best time is now."
-- Financial Planning Principle
How auto refinancing works
When you refinance a car loan, a new lender pays off your existing loan balance and you begin making payments on a new loan -- typically at a lower rate, different term, or both. Your monthly payment, total interest, and payoff date all change.
Refinancing makes financial sense when interest savings over the remaining loan life exceed your upfront fees. The break-even month is when cumulative monthly savings surpass those costs. If you plan to keep the car past that point, refinancing pays off.
Be cautious about extending your term just to lower the monthly payment. A longer term at a lower rate may still cost more in total interest. This calculator shows both monthly and total impact so you can make an informed decision.
lightbulb Example Refinance Scenario
Suppose you have $18,500 remaining on a car loan at 8.9% APR with 48 months left -- a payment of about $460/month. You qualify to refinance at 5.5% APR over 48 months.
Your new payment drops to roughly $430/month, saving $30/month. Over 48 months that's $1,440 in savings. With $200 in fees, your break-even is month 7 -- well before the loan ends.
If instead you extended to 60 months at 5.5%, your payment falls to $354/month -- but you pay 12 extra months of interest, largely erasing the rate benefit. The table shows this tradeoff clearly.
Auto Refinance FAQs
When does refinancing a car loan make sense?
Refinancing makes the most sense when rates have dropped since your original loan, your credit score has improved, or you financed through a dealership at a marked-up rate. It's most valuable early in the loan when most interest remains outstanding.
Does refinancing hurt my credit score?
A refinance application triggers a hard credit inquiry that may temporarily lower your score by a few points. Multiple auto loan inquiries within 14-45 days are typically treated as a single inquiry by credit bureaus, so rate shopping is fine.
Are there fees to refinance a car loan?
Some lenders charge origination fees, and your state may charge a title transfer fee (typically $5-$75). Check your current loan for prepayment penalties -- they're rare on auto loans, but worth verifying. Total fees are usually low enough that a meaningful rate improvement pays off quickly.
Should I shorten or extend my term when refinancing?
Shortening saves the most interest; extending lowers your payment but may cost more overall even at a lower rate. Run both scenarios in this calculator before deciding.
Refinancing terminology
Remaining Balance (Payoff Amount)
The amount you still owe -- what the new lender pays off. This becomes the principal of your new loan.
Break-Even Month
The month at which cumulative monthly savings exceed upfront refinancing costs. Refinancing is financially beneficial if you keep the car past this point.
APR (Annual Percentage Rate)
The true annual cost of the loan including interest and fees. Always compare APRs -- not just rates -- when evaluating refinance offers.
Total Interest Saved
The difference between total interest on your current loan vs. the new loan over their remaining terms. The primary number to evaluate when deciding whether to refinance.
Prepayment Penalty
A fee some lenders charge for paying off a loan early. Most modern auto loans don't include them, but check your agreement before applying to refinance.
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