Refinancing a car loan replaces your current loan with a new one at a different rate, usually to cut the monthly payment or the total interest. Whether it is worth doing comes down to three numbers: how much you still owe, how much cheaper the new rate is, and what the switch costs you in fees.
A worked example
Say you owe 18,000 with 36 months left at 11.5% APR. Your payment is roughly 594 a month, and finishing the loan as-is costs about 3,375 in remaining interest.
Refinance the same balance over the same 36 months at 7.2% and the payment drops to about 557 — around 37 a month, or roughly 1,330 over the remaining term. Subtract 200 in transfer and title fees and you keep about 1,130.
The calculator above runs exactly this comparison: it prices the old loan and the new loan over the months you have left, then deducts the fees so the headline number is what actually lands in your pocket.
Working out your break-even point
The break-even point is the number of months it takes for the monthly saving to repay the refinancing fees. Divide the fees by the monthly saving: 200 in fees against a 37 monthly saving breaks even in about six months.
If you expect to sell the car or pay the loan off before the break-even month, refinancing loses money even though the monthly payment looks lower. If you will keep the car well past it, everything after that point is profit.
Why a lower payment is not always a saving
The most common refinancing trap is stretching the term. Moving 18,000 from 36 months to 60 months cuts the payment substantially even at the same rate — but you pay interest for two extra years, so the total cost rises.
Compare like with like: keep the remaining term fixed when you test a new rate. If you do want a longer term for cash-flow reasons, look at the total-interest line rather than the monthly figure so you can see what the breathing room costs.
Also check the current loan for prepayment penalties, and watch out for a new loan that front-loads interest. Both quietly eat the saving the rate cut created.
When refinancing usually makes sense
Your credit score has improved since you took the loan out, or market rates have fallen — a rate cut of roughly two percentage points or more is where the maths usually starts to work.
You have at least a year or two of payments left. On a nearly-finished loan there is too little interest remaining for a lower rate to beat the fees.
You are not underwater. If the balance is higher than the car's value, most lenders will decline or price the loan poorly — check that first with the negative equity calculator.
Frequently asked questions
- How much does refinancing a car loan save?
- It depends on the rate gap and the time left. Cutting 11.5% to 7.2% on an 18,000 balance with 36 months remaining saves roughly 1,300 in interest, or about 1,100 after typical fees. Enter your own balance, rates and months remaining above to get your figure.
- What is the break-even point on a car refinance?
- Divide the refinancing fees by the monthly saving. Fees of 200 against a 37 monthly saving break even in about six months — refinancing only pays off if you keep the loan past that point.
- Does refinancing a car loan hurt your credit score?
- The lender's hard credit check usually causes a small, temporary dip, and the new account shortens your average account age. Rate shopping within a short window is normally treated as a single enquiry, and consistent payments on the new loan rebuild the score over time.
- Can you refinance a car loan with negative equity?
- Sometimes, but it is expensive. If you owe more than the car is worth, lenders either decline or roll the shortfall into the new loan at a higher rate, which increases the total cost even when the monthly payment falls.
- Is it worth refinancing for 1%?
- Rarely on a small or nearly-finished loan, because a one-point cut may not clear the fees. On a large balance with several years left, one point can still be worth hundreds — run the numbers above rather than relying on a rule of thumb.