Auto Downpayment Calculator Published in: Financial Calculators Auto Downpayment Calculator | Calculate Savings & Monthly Payments Auto Downpayment Calculator Max. down payment ($) Min. down payment ($) Purchase price ($) Loan term (months) Interest rate (annual %) Down payment investment rate (annual %) Federal + state tax rate (%) Calculate More money down will save you: $0 Monthly payments with more money down: $0 Monthly payments with less money down: $0