Finance Calculator
Car Refinance Calculator
Compare your current auto loan against a new refinanced rate to see your monthly savings and total interest saved.
Loan Details
Total Interest Saved
by refinancing to the lower rate
Current Payment
$548
New Payment
$517
Monthly Savings
$31
Net Savings (after fees)
$1,940
How refinancing math works.
Watch the term: extending the loan can lower the monthly payment while increasing total interest. The real win is a lower rate over the same or shorter term. This calculator compares the interest you'd still pay on your current loan against the interest on the new one, then subtracts any fees, so the number you see is your true net saving.
When refinancing actually pays off
Refinancing is worth the paperwork in a few clear situations. The most common is improved credit: if your score has climbed 50–100 points since you bought the car, you likely qualify for a materially lower rate. It also makes sense if you were sold a marked-up dealer rate — dealers often add 1–2% to the rate the lender actually offered, and refinancing strips that markup out. Finally, if market rates have fallen since your purchase, a refinance captures the difference. As a rule of thumb, a rate drop of one percentage point or more usually clears enough interest to be worthwhile.
When to leave your loan alone
Refinancing can quietly cost you money. If you're in the last year or two of the loan, most of the interest has already been paid and there's little left to save. If your balance is small — say under $5,000 — the savings often don't justify the effort. And if the only way to lower your payment is to stretch the term, you may pay more in total interest despite the lower rate. Always check the total-interest figure, not just the monthly payment.
What you need to qualify for a better rate
Lenders look at your credit score, your loan-to-value ratio (how much you owe versus what the car is worth), the vehicle's age and mileage — many won't refinance cars over 8–10 years old or above 100,000–150,000 miles — and your debt-to-income ratio. Gather your current loan payoff amount, the car's VIN and mileage, and proof of income before you apply. Then rate-shop several lenders within a two-week window so the hard inquiries count as a single hit to your credit.
Frequently asked questions.
When should I refinance my car?
Consider it when your credit score has improved, market rates have dropped, or you were sold a high dealer rate originally. A rate reduction of 1%+ usually makes refinancing worthwhile.
Does refinancing hurt my credit?
The hard inquiry causes a small, temporary dip. Rate-shop within a 14-day window and multiple inquiries count as one. The long-term effect is negligible if you make payments on time.
Are there fees to refinance a car?
Auto refinancing usually has minimal fees — possibly a small title transfer or state re-registration fee ($5–75). There's rarely a prepayment penalty on the old loan, but always check.
How soon after buying can I refinance?
Most lenders want to see 60–90 days of payment history, and the title needs to be registered — which can take a few weeks. Waiting 6–12 months also gives your credit score time to recover from the original loan's hard inquiry, often unlocking a better rate.
Can I refinance if I owe more than the car is worth?
It's harder. Lenders look at loan-to-value (LTV), and being underwater raises your LTV above what many will approve — or pushes you into a higher rate. Paying the balance down closer to the car's value first, or refinancing a smaller amount, improves your odds.
Should I refinance to a longer term to lower my payment?
Be careful. Stretching the term lowers the monthly payment but usually increases total interest, even at a lower rate. If cash flow is the goal it can help short-term, but the cheapest option is almost always a lower rate over the same or shorter term.