For example, let's say you owe $10,000 on your current car loan and the newer car you are trading your car for is $25,000. The total cost of the newer car with your trade in is now $35,000 ($25,000 + $10,000). If you finance this amount at a 4% interest rate, your monthly payments will be $700 for a 60-month loan.
Compare this to if you were to sell your current car privately. If you were able to sell your current car for $15,000, you would only owe $5,000 on the loan balance ($15,000 - $10,000). This means the total cost of the new car with your trade in is now $25,000 ($20,000 + $5,000). If you finance this amount at a 4% interest rate, your monthly payments will be $500 for a 60-month loan.
As you can see, trading in a car that isn't paid off can cost you hundreds of dollars more over the life of the loan. If you're considering trading in a car that you still owe money on, make sure you weigh the pros and cons of the decision and carefully calculate the potential costs involved.