Our free auto loan calculator helps car buyers in the USA and Canada estimate their monthly car payment before visiting a dealership. By entering the vehicle price, down payment, trade-in value, sales tax, interest rate, and loan term, you get a complete picture of what your car will cost each month.

Unlike many simple car payment calculators, our auto loan calculator factors in sales tax and trade-in value — two elements that significantly affect your total loan amount. This gives you a more realistic monthly payment estimate before you negotiate with a dealer.

How to Use the Auto Loan Calculator

Follow these simple steps to calculate your car payment:

1. Enter the vehicle price — the sticker or negotiated price of the car.
2. Enter your down payment — the cash you are putting down upfront.
3. Enter your trade-in value — the estimated value of your current vehicle.
4. Enter your local sales tax rate — this varies by US state and Canadian province.
5. Enter the interest rate and select your loan term.
6. Click Calculate Auto Loan to see your monthly payment and total cost.

When Should You Use an Auto Loan Calculator?

Use the auto loan calculator before visiting a dealership so you know exactly what monthly payment you can afford. In addition, use it to evaluate whether a longer loan term with lower payments is worth the extra interest you will pay over time.

Moreover, the auto loan calculator is useful when comparing dealer financing versus your own bank or credit union. Running both scenarios through the calculator helps you decide quickly. Furthermore, knowing your target monthly payment before you walk into the dealership puts you in a stronger negotiating position.

Tips for Getting the Best Auto Loan

Car financing can be complex. Here are some important tips to help you get the best deal:

• Get pre-approved before the dealership — A pre-approval from your bank gives you a rate to benchmark against the dealer’s offer.
• Avoid extending the loan too long — 72 or 84 month loans lower monthly payments but significantly increase total interest.
• Put at least 20% down on a new car — New cars depreciate quickly. A larger down payment prevents you from owing more than the car is worth.
• Negotiate the car price separately from financing — Dealers sometimes bundle these to obscure the true cost.
• Check your credit score before applying — Even a small improvement in your score can meaningfully lower your interest rate.

Frequently Asked Questions About the Auto Loan Calculator

What is a good interest rate for an auto loan?

In the USA, a good auto loan rate for buyers with excellent credit (750+) is typically 5–7% for new cars and 7–10% for used cars as of 2024–2025. Rates vary by lender and credit score.

Should I finance through the dealer or my bank?

Compare both options. Dealers sometimes offer manufacturer incentive rates such as 0% financing on new cars, but for used cars, your bank or credit union often provides better rates.

How does sales tax affect my auto loan?

In most US states and Canadian provinces, sales tax is added to the vehicle price before financing. This means you are borrowing more than just the car price. Our calculator includes this calculation automatically.

Related Calculators

Furthermore, you might find these related tools useful: Loan Calculator — Payment Calculator — Sales Tax Calculator

Disclaimer: Estimates do not include registration fees, dealer fees, or insurance costs. Consult your lender and dealer for exact figures.