How the auto loan payment is calculated
The calculator uses a fixed-rate amortizing loan. The required payment stays level while interest falls and principal rises over time. Taxes, fees and negative trade-in equity can increase the amount financed.
Amount financed = price + tax + fees − down payment − net trade-in equity
Payment = principal × monthly rate ÷ (1 − (1 + rate)⁻term)
How extra car payments change the loan
The extra amount is applied to principal each month, shortening the payoff period while the required payment stays unchanged. Confirm that your lender applies extra money to principal and does not merely advance the due date.
Car payment example
For a $35,000 vehicle with $5,000 down, 6.5% APR and a 60-month term, the financed balance depends on sales tax, fees and net trade-in equity. The calculator separates those inputs and shows both the monthly payment and total interest.
Sales tax and lender quote differences
This estimate applies tax to the vehicle price after the entered trade-in value. State rules differ, and some fees may be taxable. Compare the result with the lender disclosure and buyer’s order before making a decision.