Over a short period, leasing often has lower payments. Over a long period, buying usually costs less, because you keep the car and own its value at the end.

Resale value is the value you keep when you buy. A higher resale estimate lowers the net cost of buying, so use a realistic figure from a recent sales listing or a valuation guide.

Most leases limit the miles you can drive each year, and charge a fee for extra miles. Check the limit before you sign, since a long commute can change the math.

Early termination usually costs more than the remaining payments, so a lease is hard to exit. Factor in how long you expect to keep the car.

No. Sales tax, registration, and lease fees vary by state and by lender, so add them after you get the full terms.