This calculator helps you to determine whether using an auto loan or a home equity loan is the better choice for you when buying a car. Interest on home equity loans may be deducted from your federal income taxes, resulting in a lower effective interest rate. However, closing costs and after-tax interest rates also factor into the equation. Compare these factors for each of the two loans to decide which is the most financially beneficial to you. With any loan there is a risk involved if you miss payments. With a car loan, you are putting your car at risk. With a home equity loan, you are putting your home at risk.