Car Payment Calculator
Estimate auto loan payments with trade-in, sales tax, fees, and financing terms.
This tool estimates a fixed-rate auto loan payment. First it finds how much you are financing: the vehicle price minus your trade-in, plus estimated sales tax on that net amount, plus any fees you roll into the loan (registration, documentation, and similar), minus your cash down payment.
Where M is the monthly payment, P is the amount financed, r is the monthly interest rate (APR divided by 12), and n is the number of monthly payments. Sales tax rules vary by state and locality; this calculator uses one clear rule so shared links stay reproducible: tax applies to price minus trade-in, and listed fees are added after tax (not taxed in this model).
Your trade-in and down payment both reduce the amount you borrow. A higher APR or a longer term usually lowers the monthly bill but increases total interest. Compare 36-month and 72-month terms here to see the tradeoff.