If you have negative equity, the situation becomes a bit more complicated. If you trade the car in or sell it, you’ll still owe money on the leftover balance of your loan. From there, you can either roll this balance into the new loan, which can put you upside down for quite some time or you can pay this loan off separately. Neither is a particularly enviable scenario, so you may want to consider breaking even on your car loan before you decide to get a new one.