If I trade a sled to a private party for say 4000 and buy a sled from the same party for 7500, when I go to the DMV can I do the same as I would with a dealership, what I mean is can I only pay taxes on the extra 3500. Or will I be screwed and have to pay on the whole 7500. I know you can tell the dmv what ever you want but I hear these days they can look at your bank accounts and see how much your loan was for and then they will come after you with fines If the numbers don't add up. The thing is I will be getting the loan for the new sled for the full amount, to pay off what I owe on the other sled. I hope I didn't make this too confusing.