Auto Affordability Calculator View Calculator Before you go shopping for a new car, use this calculator to help you determine the sticker price you should be looking for. Enter the maximum monthly payment you can afford, the sales tax percentage you will pay on the new vehicle, and other charges that will be financed, like tags and registration, or dealer prep and delivery charges. Then enter any cash, trade-in, and dealer rebates that you will use as a down payment and the interest rate and length of the loan you are considering. This calculator will then show you the maximum vehicle price and the loan amount that will keep your payments close to what you entered. Learn more about putting this calculator or other calculators on your website.