When Does It Actually Make Sense to Refinance Your Car Loan?

I refinanced my car loan 18 months after buying the car and saved $2,400 over the remaining term. But I almost didn't do it because the math seemed complicated and I wasn't sure if the savings were real or just a longer repayment period in disguise. Turns out, the math isn't complicated at all. You just need to know what to look at. Auto refinancing means replacing your current car loan with a new one, ideally at a lower interest rate. The new lender pays off the old loan, and you make payments to the new lender instead. It sounds straightforward, but there are several ways to get it wrong. The basic math Your monthly car payment is determined by three variables: the principal (how much you owe), the interest rate, and the loan term (how many months remain). The standard amortization formula: M = P * [r(1+r)^n] / [(1+r)^n - 1] Where M is the monthly payment, P is the principal, r is the monthly interest rate (annual rate divided by 12), and n is the number of months. Let's say you owe