Leasing a car is typically easier on your wallet than buying.But lessees are much more likely than buyers to be taken advantage of, for the simple reason that it's difficult to understand what you're paying for. By law, auto loan contracts must disclose the amount being financed, the interest rate and the size of monthly payments. So it's relatively easy to see if you're being billed correctly. But leasing companies only have to disclose monthly payments -- not how they are calculated. This formula doesn't appear anywhere on a lease contract.