Your financing argument is actually flipped. You will get a better cash price if you finance because that is where dealers make money. Your best strategy if you want to pay cash is to finance the car and then pay off the loan immediately.
As far as being underwater is concerned... most dealers throw in GAP insurance these days. Removing GAP to lower the cost is counterproductive because the banks buying your loan want you to have GAP.
There really are just very few scenarios where paying cash at the dealer makes the most financial sense.
Your financing argument is actually flipped. You will get a better cash price if you finance because that is where dealers make money. Your best strategy if you want to pay cash is to finance the car and then pay off the loan immediately.
As far as being underwater is concerned... most dealers throw in GAP insurance these days. Removing GAP to lower the cost is counterproductive because the banks buying your loan want you to have GAP.
There really are just very few scenarios where paying cash at the dealer makes the most financial sense.