Tool · Investor Sam Auto

Auto Loan Refinance Calculator

June 30, 2026 • By the Investor Sam Editorial Team • Reviewed by Berly Sam Varghese, Editor
If rates have dropped or your credit has improved since you bought your car, refinancing the loan can lower your monthly payment and total interest. This calculator compares your current loan against a new rate and term, showing both the change in your monthly payment and the lifetime difference. Watch the total-savings figure closely, because stretching the term can lower the payment while quietly costing you more overall.

Example: Current loan balance: 22000 $ · Current APR: 9.5 % · Months remaining: 48 months · New APR: 6 % · New term: 48 months

Monthly savings$36
Total interest savings$1,730
Current payment$553
New payment$517

Worked example

Say you owe $22,000 with 48 months left at 9.5%, a payment of about $554. Refinance to 6% over the same 48 months and the payment falls to roughly $517, saving about $37 a month. Because you kept the term the same, that monthly saving compounds into roughly $1,760 less interest over the life of the loan — real money for a single application.

Frequently asked questions

When does refinancing a car make sense?

It usually pays off when the new rate is meaningfully lower than your current one, your credit has improved, or you are early enough in the loan that interest still makes up a large share of each payment. If you only have a few months left, the savings are small.

Does keeping the same term matter?

Yes. Lowering the rate while keeping the same number of months captures the full interest savings. Extending the term lowers the monthly payment but can wipe out or reverse the total savings, so compare the total-savings line, not just the payment.

Will refinancing hurt my credit?

A refinance application triggers a hard inquiry, which can dip your score a few points temporarily. Shopping multiple lenders within a short window is typically treated as a single inquiry. The long-term benefit of a lower rate usually outweighs the small dip.

Can I refinance if I owe more than the car is worth?

It is harder. Lenders prefer a loan-to-value ratio below 100%. If you are underwater, you may need to pay down the balance first or find a lender that allows higher LTV, often at a higher rate.

💎
InvestorSam.com
Stock analysis, market insights & portfolio research — free
Ready to put these numbers to work?
Get stock picks, earnings analysis, and market commentary from Investor Sam.
Visit InvestorSam.com →

Sources

Berly Sam Varghese · Editor, Investor Sam

Berly Sam Varghese is an engineer who treats money the way he treats any hard problem — something to be engineered, not gambled on. He funded years of education and built real financial stability the patient way, by living below his means and investing rather than borrowing. He writes for the person trying to make a car decision without overpaying for years. He reviews and approves every article on Investor Sam and checks the figures against primary sources before anything is published. More about our standards.