How to Calculate the True Cost of Auto Financing

Retained from the earlier FinanceMath website. This historical guide has not yet completed the rebuild’s editorial review. Tax rates, eligibility rules and dated claims must be checked against current official sources. For tested calculation methods, use the current calculators.

How to Calculate the True Cost of Auto Financing

Calculate auto loan principal, interest rates, trade-in values, and sales taxes before visiting car dealerships.

Hidden Costs in Auto Financing

Beyond principal and monthly payment numbers, dealer documentation fees, sales taxes, and extended warranties heavily impact total financing math.