9 mins read 
Key takeaways
- Most auto loans are fixed-rate loans.
- A fixed-rate auto loan keeps your rate and monthly payment predictable.
- A variable-rate auto loan can rise or fall based on market conditions or a benchmark rate.
- Variable rates may start lower, but they can become more expensive if rates increase.
- If your current loan has a high or unpredictable rate, refinancing may help you compare new terms.
Most auto loans have fixed interest rates, which means your rate and monthly payment usually stay the same for the life of the loan. Variable-rate auto loans are less common, but they do exist. They can start with a lower rate, but that rate can change over time — and so can your payment.
For many drivers, a fixed-rate car loan is the simpler and safer choice because it makes budgeting easier. But it’s still worth understanding how both options work, especially if you’re comparing loan offers or thinking about refinancing your car loan.
Fixed vs. variable auto loan rates
The biggest difference between a fixed and variable auto loan rate is whether the rate can change after you sign your loan agreement.
| Feature | Fixed-rate auto loan | Variable-rate auto loan |
|---|---|---|
| Interest rate | Stays the same | Can change over time |
| Monthly payment | Usually stays the same | May go up or down |
| Budgeting | More predictable | Less predictable |
| Common for auto loans? | Yes | Less common |
| Main benefit | Stability | Possible lower starting rate |
| Main risk | You may miss out if rates fall later | Your payment could increase |
A fixed rate is usually easier to plan around. A variable rate may look appealing if the starting APR is lower, but it also comes with more uncertainty.
Could you qualify for a lower APR?
See whether refinancing could give you a better rate, lower payment or more manageable term.
What is a fixed-rate auto loan?
A fixed-rate auto loan has an interest rate that stays the same for the life of the loan. If you take out a 60-month fixed-rate loan, your rate won’t change during those 60 months.
That also means your monthly principal-and-interest payment should stay the same, unless your loan includes other charges or products that affect the total payment.
For example, if you borrow $25,000 with a fixed APR, your payment is calculated using that APR, your loan term and your loan amount. Once the loan is finalized, your payment schedule is set.
That predictability is the main reason fixed-rate auto loans are common. You know what you owe each month, and you don’t have to worry about your payment jumping because market rates changed.
APR and interest rate aren’t always the same thing, though. APR can include certain loan costs, which is why it’s helpful to understand the difference between APR and interest rate for auto loans before comparing offers.
What is a variable-rate auto loan?
A variable-rate auto loan has an interest rate that can change after the loan starts. The rate is usually tied to a benchmark or index, such as the prime rate. If that benchmark rises, your loan’s APR may rise too. If it falls, your APR may go down, depending on your loan terms.
That means your monthly payment could change.
Variable-rate loans can sometimes start with a lower rate than fixed-rate loans. But the lower starting rate doesn’t always mean the loan will be cheaper in the long run. If rates increase, you could end up paying more than expected.
Before choosing a variable-rate loan, read the fine print carefully. You’ll want to know:
- How often the rate can change.
- What benchmark or index the rate follows.
- Whether there’s a cap on how high the rate can go.
- How much your monthly payment could increase.
- Whether the lower starting rate is worth the risk.
Rates can also change between a preliminary quote and final approval. That doesn’t always mean something went wrong. Lenders may need to review your credit, vehicle details, income, loan amount and other information before finalizing an offer. Here’s more on why your auto loan rate may change after you apply.
Is a fixed or variable rate better for a car loan?
For most drivers, a fixed-rate auto loan is usually better because it’s predictable. Your rate stays the same, your payment is easier to budget for, and you’re not exposed to future rate increases.
| Choose a fixed-rate auto loan if… | Consider a variable-rate auto loan if… |
|---|---|
| You want a steady monthly payment. | The starting rate is meaningfully lower than a fixed-rate offer. |
| You’re planning to keep the loan for several years. | You expect to pay off the loan quickly. |
| Your budget doesn’t have much room for payment increases. | Your budget can handle a higher payment if rates rise. |
| You don’t want to track rate changes. | You understand how and when the rate can change. |
| You’re refinancing to make your payment more manageable. | The loan has a clear rate cap that limits how high the rate can go. |
The longer your loan term, the more time there is for a variable rate to change. That’s one reason it’s important to look beyond the monthly payment and compare the full cost of the loan. If you’re deciding between different terms, this guide on how loan terms affect the cost of credit can help you understand the trade-off.
Why fixed-rate auto loans are more common
Cars are already expensive to own. Between the payment, insurance, maintenance, gas and registration, most drivers want fewer surprises — not more.
A fixed-rate loan helps keep one major part of your budget steady. You’ll still need to account for other car costs, but your loan payment should be easier to plan around.
That stability can be especially helpful if you’re trying to lower your monthly expenses. If your current car payment feels too high, refinancing into a fixed-rate loan with better terms could be one option to compare. You can start by looking at how much you may be able to save by refinancing your car loan.
When a variable-rate auto loan may be risky
A variable-rate auto loan can be risky because the payment you start with may not be the payment you keep.
That matters because even a small increase can make your budget tighter. If your payment rises at the same time your insurance, maintenance or other expenses go up, the loan may become harder to manage.
A variable rate may be especially risky if:
- You’re already close to the top of your monthly budget.
- You’re choosing a long loan term.
- The loan doesn’t have a clear rate cap.
- You don’t know how often the rate can adjust.
- You’re only choosing it because the starting payment is lower.
A lower payment can be helpful, but it’s not the only thing that matters. You’ll also want to compare total interest, loan length and the risk of future payment increases.
Can you refinance from a variable rate to a fixed rate?
Yes, if you qualify, you may be able to refinance from a variable-rate auto loan into a fixed-rate auto loan.
Refinancing replaces your current loan with a new one. The new loan may have a different APR, monthly payment, loan term or lender. Many drivers refinance to try to lower their monthly payment, reduce their rate or get more predictable loan terms.
Refinancing may make sense if:
- Your current rate is high.
- Your payment has increased.
- Your credit has improved.
- Market rates are lower than when you got your original loan.
- You want to move into a fixed-rate loan.
- You want to compare a different loan term.
Timing matters, too. Some drivers refinance soon after buying a car, while others wait until their credit, income or loan balance has changed. Here’s a closer look at when you can refinance a car loan and how soon you can refinance after purchase.
How to compare fixed and variable auto loan offers
When comparing loan offers, don’t just look at the monthly payment. A lower payment can come from a lower rate, but it can also come from a longer term — and a longer term may mean paying more interest over time.
Before choosing a loan, ask:
- Is the APR fixed or variable?
- What’s the monthly payment?
- What’s the total loan amount?
- What’s the loan term?
- How much interest will I pay over the full loan?
- Are there fees?
- Is there a prepayment penalty?
- If the rate is variable, how often can it change?
- If the rate is variable, how high can it go?
It also helps to understand what goes into the refinancing process before you apply. If you’re newer to the topic, this explainer on what auto refinancing is and how it works can give you a clearer starting point.
Bottom line
Most auto loans are fixed-rate loans, and that’s usually a good thing. A fixed rate keeps your monthly payment predictable, which makes it easier to budget.
A variable-rate auto loan may start with a lower APR, but it can also change over time. That means your payment could go up, especially if market rates rise.
If you already have a variable-rate loan, a high-rate loan or a payment that no longer fits your budget, refinancing may be worth comparing. Just make sure you look at the full picture: APR, monthly payment, loan term, total interest and whether the new loan gives you the stability you’re looking for.
FAQs: Are auto loans fixed or variable?
Are most auto loans fixed or variable?
Most auto loans are fixed-rate loans. Variable-rate auto loans exist, but they’re less common.
Is a fixed rate better than a variable rate for a car loan?
A fixed rate is usually better for most drivers because it keeps the monthly payment predictable. A variable rate may start lower, but it can increase over time.
Can a variable-rate car loan payment go up?
Yes. If your loan’s rate is tied to a benchmark that increases, your APR and monthly payment may also increase.
Can I refinance a variable-rate car loan into a fixed-rate loan?
Yes, if you qualify. Refinancing can replace your current loan with a new loan that may have a fixed rate, different term or different monthly payment.
How do I know if my auto loan has a fixed or variable rate?
Check your loan agreement or ask your lender. Your contract should say whether your APR is fixed or variable.
