How this calculator works
This calculator estimates monthly car payments after accounting for sales tax, down payment, trade-in value, interest rate, and loan term. Enter the vehicle price, sales tax rate, down payment or trade-in value, annual interest rate, and loan term to see the estimated monthly payment. Use it when buying or leasing a vehicle and comparing financing options. The key inputs are vehicle price, tax rate, down payment, interest rate, and term in years. The output is the monthly payment and total amount financed. Real-world applications include car shopping, trade-in evaluation, and financing comparison. The calculator adds sales tax to the vehicle price, subtracts down payment or trade-in value, then applies the fixed monthly amortization formula. It does not include dealer fees, registration, warranties, or gap insurance. A lower monthly payment may come from a longer term, which can cost more interest overall.