Auto Loan Calculator

Purchasing a new or used motor vehicle involves complex pricing layers far beyond the advertised showroom window sticker price. Dealership purchase agreements integrate existing trade-in equity, upfront cash down payments, dealer documentation fees, and regional sales taxes directly into the financed loan balance. By entering the agreed vehicle purchase price alongside your down payment, trade-in credit, sales tax rate, loan duration, and annual interest rate, you can determine your actual monthly financing commitment.

The resulting calculation details the net financed principal, monthly installment requirement, and total cumulative interest accumulated across the life of the loan. Comparing different repayment terms illustrates how extending financing to 72 or 84 months lowers individual monthly payments while drastically increasing overall borrowing expenses. Note that standard auto loan formulas assume fixed interest rates and do not incorporate recurring ownership overhead such as comprehensive insurance policies, annual vehicle registration renewals, fuel, or routine mechanical upkeep.

The net financed amount is established by subtracting the down payment and trade-in value from the vehicle purchase price, then adding applicable sales tax and dealer fees. The monthly payment is calculated by applying standard loan amortization against this net principal using the periodic interest rate and total loan term in months. Total interest represents the difference between all cumulative monthly payments and the initial net financed principal.