Estimate your monthly auto loan payment, factoring in trade-ins, down payments, and sales tax.
Purchase Details
Loan Terms
Estimated Monthly Payment
$0.00/mo
Total Financed$0.00
Total Interest Paid$0.00
Total Cost of Vehicle$0.00
Most states deduct trade-in value from the taxable vehicle amount, reducing your sales tax. "Total Cost of Vehicle" includes your trade-in and down payment at their value, not just cash paid — title and registration fees are not included.
Last updated: July 2026
Don't Get Tricked at the Dealership
Car dealerships love to negotiate based on 'monthly payments' rather than the total price of the car. By extending the loan term to 72 or 84 months, they can make the monthly payment look small while hiding thousands of dollars in extra interest. Knowing the math before you walk onto the lot is your biggest advantage. This tool is for estimating purposes — not financial advice — and your actual rate and terms will depend on your lender and credit profile.
How to Use This Tool
Enter the vehicle price, trade-in value, down payment, and loan details (interest rate and term length). The calculator shows your estimated monthly payment and, more importantly, the total interest you'll pay over the life of the loan — the number dealers rarely lead with.
A Worked Example
Using the calculator's own defaults — a $35,000 vehicle, $5,000 trade-in, $3,000 down payment, 6.5% interest, 60-month term, and 7% sales tax:
Total interest over 60 months: approximately $5,064
These figures are approximate — verify the exact output against the live calculator above.
Frequently Asked Questions
Financial experts generally recommend financing a car for no more than 48 to 60 months (4-5 years). Longer terms mean you'll pay significantly more in total interest and risk being 'underwater' on the loan. That said, the average new-car loan term has stretched to around 68-69 months industry-wide as of 2026, as buyers stretch payments to manage rising vehicle prices — that trend doesn't make longer terms a good deal, just a common one.
A larger down payment doesn't usually lower your interest rate directly, but it reduces the principal amount you're borrowing, which lowers the total amount of interest you'll pay over the life of the loan.
Being underwater (or negative equity) means you owe more on the loan than the car is currently worth. This happens frequently with long loan terms and small down payments, because cars depreciate quickly, especially in the first couple of years.
As of mid-2026, average new-car loan rates run roughly 6.4-7% overall, but your actual rate depends heavily on credit score — buyers with excellent credit are seeing rates closer to 4.5-5%, while those with poor credit can see rates well above 15%. Shop your rate with a bank or credit union before visiting a dealership so you have a baseline to compare against.
In most US states, yes — the taxable amount is calculated as the car's price minus your trade-in value, so you only pay sales tax on the difference. A few states don't offer this trade-in tax credit, so it's worth confirming your specific state's rule before assuming the savings apply to you.
It's worth comparing both. Dealers sometimes mark up the interest rate they get you approved for, while banks and credit unions often offer their real rate directly. Getting pre-approved by your own bank or credit union before you shop gives you a baseline number to negotiate against, or to walk away with if the dealer can't beat it.
No — this calculator includes vehicle price and sales tax, but not title, registration, or documentation fees, which vary by state and dealer. Ask for a full out-the-door quote in writing before signing anything, since these fees can add a meaningful amount to your total cost.