you have to figure out what the trade-in value is. if your car's worth more than what you owe the difference serves as down payment on the new one. if it's worth less than what's owed you have negative equity added to the new loan, which you might have to cover with down payment. if the value/balance is the same it's a wash.

Edited By: jonboy212 10/29/2009 11:40 PM. Edited 1 times.