Start with the amount financed
The vehicle price is not necessarily your loan amount. Your down payment and trade-in credit reduce what you need to borrow. Sales tax and registration, title or dealer fees increase it if you finance them rather than pay them at purchase. Tax treatment and trade-in credits vary by state; check your local rules and purchase contract.
For a simplified estimate, use vehicle price − down payment − trade-in + financed sales tax + financed fees = amount financed. Optional products, a balance still owed on your trade-in or other contract charges can change the real number.
Then compare interest and term
The interest rate and repayment term determine how much the financed amount costs to repay. A longer term generally lowers the monthly payment but raises total interest if the amount financed and rate stay the same. The CFPB recommends comparing the loan amount, annual percentage rate (APR), interest rate, term and monthly payment—not just one payment figure. APR can include certain finance charges; a calculator using only the entered interest rate does not replace a lender’s APR disclosure.
Worked example: where the money goes
Take a $35,000 vehicle with $5,000 down, no trade-in, 7% sales tax calculated on the full vehicle price and $500 in financed fees. In this simplified example, sales tax is $2,450 and the amount financed is $32,950. At a 5% annual interest rate for 60 months, the estimated payment is $621.81/month; interest over the term is about $4,358. Add the $5,000 paid up front to the roughly $37,308 repaid on the loan, and the estimated outlay is about $42,308, excluding fuel, insurance, maintenance and any other charges. Monthly-payment rounding can shift the final totals slightly.
Questions to ask before signing
- What are the out-the-door price, itemized fees and tax treatment?
- How much will you finance after the down payment and trade-in, and is any outstanding trade-in debt rolled into the new loan?
- What are the APR, interest rate, term, total finance charge and total of payments on the contract?
- Are warranties, GAP insurance or other add-ons included, and are they optional?
The CFPB warns that a longer term can keep you owing more than the car is worth for longer. Make sure the loan fits your whole transportation budget, not only the payment on the window sticker.
Test a few scenarios
Use the auto loan calculator to change the down payment, trade-in, tax, fees, rate and term. Compare total loan amount and total interest alongside the monthly payment. The tool estimates tax on the full vehicle price; your state or deal may use a different taxable amount. It does not include optional add-ons or operating costs.