You're losing not only the negative equity, but also a lot of what you've already paid for the SUV (I assume it's relatively new since you're still upside down). For example, say you paid $20,000 for the SUV, and it's now worth $10,000, and you owe $12,300. You're not only losing the $2300 in negative equity that you have to pay for, but you've also lost the $10K that the car dropped in value. Well, you didn't lose all of it, because you did get some use out of the car. But if you trade the SUV now, you're only driving it during its most expensive years, and not taking advantage of the years where it costs less to own it. And what's the difference in MPG on the Camry? Unless it's a big difference, and you put a lot of miles on your vehicle, you may never make up what you're losing.