Share your insights or perspective on the financial matter presented in the input.

How to compute for losses in an upside down trade-in of a financed car?
I think you are making this more complicated that it has to be.  In the end you will end up with a car that you paid X, and is worth Y. Your numbers are a bit hard to follow.  Hopefully I got this right. I am no accountant, this is how I would figure the deal: The payments made are irrelevant.  The downpayment is irrelevant as it is still a reduction in net worth.   Your current car has a asset value of <29,500>.  That should make anyone pause a bit.   In order to get into this new car you will have to finance the shortfall on the current car (29,500), the price of the vehicle (45,300), the immediate depreciation (say 7,000).  In the end you will have a car worth 38K and owe 82K.  So you will have a asset value of <44,000>.  Obviously a much worse situation.  To do this car deal it would cost the person 14,500 of net worth the day the deal was done.  As time marched on, it would be more as the reduction in debt is unlikely to keep up with the depreciation. Additionally the new car purchase screen shows a payment of $609/month if you bought the car with zero down.  Except you don't have zero down, you have -29,500 down.  Making the car payment higher, I estamate 1005/month with 3.5%@84 months.  So rather than having a hit to your cash flow of $567 for 69 more months, you would have a payment of about $1000 for 84 months if you could obtain the interest rate of 3.5%. Those are the two things I would focus on is the reduction in net worth and the cash flow liability.   I understand you are trying to get a feel for things, but there are two things that make this very unrealistic.  The first is financing.  It is unlikely that financing could be obtained with this deal and if it could this would be considered a sub-prime loan.  However, perhaps a relative could finance the deal. Secondly, there is no way even a moderately financially responsible spouse would approve this deal.  That is provided there were not sigificant assets, like a few million. If that is the case why not just write a check?