Auto Loan Calculator
Calculate your monthly car payment, total interest, and amortization schedule. Compare different loan terms to find the best option for your budget.
Monthly Payment
$485.32
Principal vs Interest Breakdown
Loan Balance Over Time
Compare Loan Terms
See how different loan terms affect your monthly payment and total cost.
| Term | Monthly Payment | Total Interest | Total Cost |
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Amortization Schedule
Detailed monthly breakdown showing how your payment is split between principal and interest.
| Month | Payment | Principal | Interest | Balance |
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Understanding Auto Loan Calculations
Auto loans use an amortization formula to calculate monthly payments. The formula is: M = P[r(1+r)^n] / [(1+r)^n - 1], where:
- M = Monthly payment
- P = Principal loan amount (vehicle price - down payment - trade-in + sales tax)
- r = Monthly interest rate (annual rate / 12)
- n = Total number of monthly payments
The loan amount includes the vehicle price minus any down payment and trade-in value, plus sales tax (which varies by state). In the early months of the loan, most of your payment goes toward interest. As the loan progresses, more goes toward principal.
Your interest rate depends on several factors: credit score, loan term, whether the car is new or used, and current market rates. New cars typically have lower rates than used cars. Shorter loan terms usually qualify for better rates because they represent less risk to lenders.
Tips for Getting the Best Auto Loan
Check Your Credit Score First
Your credit score is the biggest factor in determining your interest rate. Check it before shopping and correct any errors. A score above 700 typically qualifies for the best rates.
Get Pre-Approved
Shop for rates at banks and credit unions before visiting dealerships. Pre-approval gives you negotiating power and helps you avoid dealer markup on financing rates.
Make a Larger Down Payment
Putting 20% down on a new car or 10% down on a used car reduces your loan amount, lowers monthly payments, and helps you avoid being underwater on the loan.
Choose the Shortest Term You Can Afford
While longer terms mean lower monthly payments, they cost significantly more in total interest. A 48-60 month term balances affordable payments with reasonable interest costs.
Negotiate the Price First
Never negotiate monthly payments. Always negotiate the vehicle purchase price first, then discuss financing separately. Dealers often use monthly payment negotiations to hide unfavorable terms.
Consider Total Cost, Not Just Monthly Payment
A lower monthly payment often means a longer loan term and more total interest paid. Always calculate and compare the total cost of the loan across different terms.
When to Refinance Your Auto Loan
Refinancing your auto loan can save you money if interest rates have dropped or your credit score has improved. Consider refinancing if:
- Current rates are at least 1-2% lower than your existing rate
- Your credit score has improved by 50+ points since you got the original loan
- You have at least two years remaining on your loan
- Your car is worth more than you owe (not underwater)
- You can reduce your interest rate without extending the loan term significantly
Avoid refinancing if you are near the end of your loan term. Most of the interest is paid in the early years, so refinancing late in the loan may not save much money and could extend your debt unnecessarily.
Frequently Asked Questions
How is a car loan payment calculated?
Monthly car payment is calculated using the formula M = P[r(1+r)^n]/[(1+r)^n-1], where P is the loan principal (vehicle price minus down payment and trade-in, plus sales tax), r is the monthly interest rate (annual rate divided by 12), and n is the number of monthly payments. This amortization formula ensures you pay the same amount each month while the split between principal and interest changes.
What is a good interest rate for a car loan?
Good auto loan rates depend on credit score, loan term, and whether the car is new or used. For new cars with excellent credit (720+), rates typically range from 4-7%. Used cars usually carry rates 1-2% higher due to increased depreciation risk. Credit unions often offer lower rates than banks or dealer financing. In 2024-2026, average new car rates are around 6-8%, while used car rates are 7-10%.
How does the loan term affect total cost?
Longer loan terms mean lower monthly payments but significantly more total interest paid. For example, a $30,000 loan at 6%: a 48-month term costs $4,000 in interest with $704/month payments, while a 72-month term costs $6,000 in interest with $497/month payments. The longer term costs $2,000 more overall. Additionally, longer terms increase the risk of owing more than the car is worth (negative equity).
Should I make a larger down payment?
A larger down payment reduces your loan amount, monthly payment, and total interest paid. It also helps avoid being underwater on your loan (owing more than the car is worth). Most experts recommend at least 20% down on a new car and 10% on a used car. A larger down payment may also qualify you for a better interest rate since it reduces the lender's risk. If you cannot afford 20% down, consider a less expensive vehicle.
Does sales tax affect my car payment?
Yes. In most states, sales tax is calculated on the vehicle price (sometimes minus trade-in value) and added to the loan amount if not paid upfront. This increases both your monthly payment and total interest. For example, a $30,000 car with 7.5% sales tax adds $2,250 to your loan. Some states (like Oregon, Montana, New Hampshire, and Delaware) have no sales tax on vehicles. Always factor sales tax into your total cost when budgeting for a vehicle.
What is the difference between APR and interest rate?
The interest rate is the cost of borrowing the principal loan amount, expressed as a percentage. APR (Annual Percentage Rate) includes the interest rate plus any additional fees charged by the lender, such as origination fees, documentation fees, or loan processing fees. APR provides a more complete picture of the total cost of the loan. For auto loans, APR and interest rate are often very close or identical if there are minimal fees.
Can I pay off my auto loan early?
Most auto loans allow early payoff without penalties, but some lenders charge prepayment penalties. Check your loan agreement before making extra payments. Paying off your loan early saves you interest, especially if you pay it off in the first half of the loan term when most interest accrues. Even making one extra payment per year or rounding up your monthly payment can save hundreds in interest and shorten your loan term by several months.
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- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates for planning purposes and should not replace professional financial advice.
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Auto Loan Calculator FAQ
How is a car loan payment calculated?
Monthly car payment is calculated using the formula M = P[r(1+r)^n]/[(1+r)^n-1], where P is the loan principal (vehicle price minus down payment and trade-in, plus sales tax), r is the monthly interest rate (annual rate divided by 12), and n is the number of monthly payments.
What is a good interest rate for a car loan?
Good auto loan rates depend on credit score, loan term, and whether the car is new or used. For new cars with excellent credit, rates typically range from 4-7%. Used cars usually carry rates 1-2% higher. Credit unions often offer lower rates than banks or dealer financing.
How does the loan term affect total cost?
Longer loan terms mean lower monthly payments but significantly more total interest paid. For example, a $30,000 loan at 6%: a 48-month term costs $4,000 in interest with $704/month payments, while a 72-month term costs $6,000 in interest with $497/month payments. The longer term costs $2,000 more overall.
Should I make a larger down payment?
A larger down payment reduces your loan amount, monthly payment, and total interest paid. It also helps avoid being underwater on your loan (owing more than the car is worth). Most experts recommend at least 20% down on a new car and 10% on a used car.
Does sales tax affect my car payment?
Yes. In most states, sales tax is calculated on the vehicle price (sometimes minus trade-in value) and added to the loan amount if not paid upfront. This increases both your monthly payment and total interest. Some states have no sales tax on vehicles.