When does refinancing a car loan make sense?
Refinancing replaces your current auto loan with a new one, ideally at a lower rate. It usually pays off when your credit score has improved since you bought the car, when market rates have dropped, or when you took dealer financing with a marked-up rate. It rarely helps late in a loan, when most of the interest has already been paid.
Refinance formula
Interest = payment × months − balance
Net savings = current interest − new interest − fees
Break-even month = fees ÷ monthly savings
Worked example
You owe $20,000 at 9% with 48 months left, so you pay $497.70 a month and still owe $3,889.64 in interest. A credit union offers 5.5% for 48 months with $200 in fees. The new payment is $465.13, saving $32.57 a month, and the interest drops to $2,326.22. After fees you save about $1,363, and the fees are recovered in the seventh month.
Stretching the new loan to 60 months would drop the payment to $382.02, but the interest would rise to $2,921.39 and you would pay for the car a year longer.
Before you refinance
- Check your credit score. The best rates go to scores above about 720.
- Compare at least three lenders, including a credit union. Rate shopping within a short window counts as one credit inquiry for most scoring models.
- Ask about prepayment penalties on your current loan and title transfer fees in your state.
- Watch the term. A longer term lowers the payment but can cost more in total.
- Check the car's value. Many lenders will not refinance if you owe much more than the car is worth.
See what your car is worth now with the car depreciation calculator, or model a new purchase with the car loan calculator.
Frequently asked questions
How much can I save by refinancing my car?
It depends on the rate difference, the balance and the time left. Refinancing $20,000 with 48 months left from 9% to 5.5% saves about $1,563 in interest, or about $1,363 after $200 in fees.
Does refinancing a car hurt your credit?
A new loan causes a hard inquiry and a small, temporary dip in your score. Making on-time payments on the new loan usually restores it within a few months.
When should I not refinance my car loan?
When the rate drop is small, when fees eat up the savings, when you are near the end of the loan, or when the only way to lower the payment is a much longer term.
Can I refinance a car loan with the same lender?
Some lenders allow it, but it is usually better to compare offers from banks, credit unions and online lenders.
More car calculators
Last updated October 2026.