Refinancing usually lowers your monthly payment, but not always—it depends on the new loan term and interest rate
When you refinance a car loan, you replace your existing loan with a new one from a different lender. The new loan pays off what you still owe on the old one. Your monthly payment goes down if the new interest rate is lower than your current rate, or if you stretch the loan over more months. Your payment goes up if you shorten the loan term or if rates have risen since you first borrowed. The math is straightforward: lower rate or longer term means lower payment; higher rate or shorter term means higher payment.
Most people refinance to lower their rate—usually because their credit score has improved since they took out the original loan, or because market rates have dropped. A rate drop of even 1 or 2 percentage points can cut your monthly payment by $50 to $150 or more, depending on how much you still owe and how long the loan runs.
Key Takeaways
- Your payment drops when your new interest rate is lower than your current rate, or when you extend the loan over more months.
- Your payment rises if you shorten the loan term or if the new rate is higher than what you currently pay.
- Refinancing costs money upfront—typically $0 to $500 in fees—so calculate whether the monthly savings will cover that cost before you commit.
- The longer you stretch a refinanced loan, the more total interest you pay over time, even if your monthly payment shrinks.
- Your current loan balance, remaining term, and credit score all affect what rate a new lender will offer you.
How the new interest rate affects your payment
The interest rate is the primary lever that moves your payment up or down. If you refinance at a lower rate, your payment falls because less of each payment goes toward interest and more goes toward principal. A borrower with $15,000 remaining on a 5-year loan at 8% pays roughly $304 per month; the same $15,000 at 5% costs roughly $283 per month—a $21 drop.
The size of the rate drop matters. A 0.5 percentage point cut saves less than a full point does. A 2 percentage point drop saves significantly more. You can find your current rate on your loan statement or by calling your lender. Before you refinance, ask the new lender what rate they will offer you based on your credit score and income. That quote tells you whether refinancing will actually lower your payment.
If rates have risen since you took out your original loan, or if your credit score has dropped, the new rate may be higher than your current one. In that case, refinancing will raise your payment unless you extend the loan term to offset the higher rate.
How loan term length changes what you pay each month
Loan term is the second factor. If you refinance into a longer term—say, from 48 months remaining to 60 months—your payment shrinks because you are spreading the balance over more months. The same $15,000 at 6% costs $277 per month over 60 months but $340 per month over 48 months. Stretching the loan by 12 months saves $63 per month.
The trade-off is that you pay more total interest over the life of the loan. Those extra 12 months of payments mean 12 extra months of interest charges, even at the same rate. If you refinance into a shorter term—say, from 60 months to 48 months—your payment rises, but you pay off the car faster and pay less total interest.
Many people refinance specifically to lower their payment by extending the term, especially if they are facing a cash flow problem. This works, but it costs you in total interest paid. Calculate the total interest you will pay under the new terms before you sign, so you know the real cost of that lower payment.
Refinancing costs and whether the savings justify them
Refinancing is not free. Most lenders charge between $0 and $500 in fees—typically a loan origination fee, title transfer fee, or documentation fee. Some credit unions and online lenders charge nothing. The fee either comes out of your pocket upfront or gets rolled into the new loan balance, which means you pay interest on it.
Before you refinance, calculate how many months of payment savings it will take to cover the fee. If your new lender charges $300 and your payment drops by $40 per month, you break even after 7.5 months. If you plan to keep the car for at least that long, refinancing makes financial sense. If you are selling or trading the car in six months, the fee may not be worth it.
Ask the lender for a loan estimate that shows the fee, the new interest rate, the new monthly payment, and the total amount you will pay over the life of the loan. Compare that total to what you would pay if you kept your current loan. That comparison is the only one that matters.
When your credit score affects the rate you get
Lenders set your interest rate based on your credit score, income, and the car's age and value. If your score has improved since you took out the original loan—because you paid bills on time, paid down debt, or fixed errors on your credit report—you will likely may have access to for a lower rate. That is the most common reason people refinance.
If your score has dropped or stayed the same, you may not get a better rate. Some lenders specialize in borrowers with lower scores and will refinance you, but at a rate that is higher than or equal to your current one. In that case, you would need to extend the term significantly to lower your payment, which costs you more in total interest.
Check your credit score before you apply to refinance. You can get a free score from your bank, credit card issuer, or a free service like Credit Karma or AnnualCreditReport.com. Knowing your score helps you predict what rate you will be offered and whether refinancing is worth pursuing.
How much you still owe affects your refinancing options
Most lenders will not refinance a car loan if you owe more than the car is worth—a situation called being "underwater" or "upside down" on the loan. If you owe $18,000 on a car worth $16,000, most lenders will decline. Some credit unions and specialized lenders will refinance underwater loans, but at a higher interest rate to cover their risk.
The amount you owe also affects the payment savings. If you owe $5,000, a 1 percentage point rate drop saves you less per month than a 1 point drop on a $20,000 balance. Larger balances produce larger payment changes. If you are early in your loan—say, only 12 months in on a 60-month loan—you have a lot of balance left and stand to save more by refinancing. If you are near the end, the balance is small and the savings are smaller.
The total cost of refinancing versus keeping your current loan
The decision to refinance comes down to total cost, not just monthly payment. A lower monthly payment sounds good, but if you extend the term by several years, you may pay thousands more in interest overall.
| Scenario | Current Loan | Refinanced Loan | Total Difference |
|---|---|---|---|
| Balance: $15,000 | Current rate: 8% | Months left: 48 | $304/month | $1,600 total interest remaining | $283/month at 5% over 48 months | $1,200 total interest | $300 fee | Save $21/month and $100 in interest, minus $300 fee = net cost $200 |
| Balance: $15,000 | Current rate: 8% | Months left: 48 | $304/month | $1,600 total interest remaining | $263/month at 5% over 60 months | $1,800 total interest | $300 fee | Save $41/month but pay $200 more in interest plus $300 fee = net cost $500 |
In the first scenario, refinancing at a lower rate over the same term saves you money overall. In the second, the lower payment comes at a cost because you are paying interest for 12 extra months. Run the numbers for your specific situation before you commit.
Frequently Asked Questions
Can I refinance if I still owe more than the car is worth?
Most mainstream lenders will decline. Some credit unions and online lenders that specialize in underwater loans will refinance you, but typically at a higher interest rate than you currently pay. You would need to extend the term significantly to lower your payment, which increases your total interest cost.
How long does refinancing take?
Most lenders can approve and fund a refinance within 3 to 7 business days. Some online lenders are faster. Your current lender receives the payoff funds and closes your old loan. You make payments to the new lender starting the month after funding.
Will refinancing hurt my credit score?
A hard inquiry from the new lender will temporarily lower your score by a few points. Refinancing also closes one loan and opens another, which can affect your credit mix. The impact is usually small and temporary. Your score typically recovers within a few months as you make on-time payments to the new lender.
What if I want to pay off the car faster instead of lowering my payment?
Refinance into a shorter term at a lower rate. This raises your monthly payment but cuts years off the loan and saves you thousands in interest. For example, refinancing from 60 months to 36 months at a lower rate means higher payments but you own the car sooner and pay far less total interest.
Do I have to refinance with a bank, or can I use a credit union or online lender?
You can refinance with any lender—banks, credit unions, online lenders, or even your current lender. Shop around and get quotes from at least three lenders. Rates and fees vary, and a 0.5 percentage point difference can save you hundreds over the life of the loan.