Buying my son's vehicle from him taking over payments

Contact them! Or you could simply take his payment book and keep paying but you want to make sure the title goes to you instead of him. At a minimum get him to sign a deal so you have recourse should he decide to be a twit.

Since it's your Son I wouldn't even involve the finance company. Doing so will most likely create a bunch of red tape and problems that you don't need to be bothered with. Such as applying for a new loan, possibly for a longer time period, at a different interest rate which will be higher because the vehicle is older, and other paperwork. Do as FOR said and just take over the payments. I would definitely have you and your Son both sign a document stating that this is what is happening. A third signature of a witness is good too. When you get the title at the end of the loan your Son will have to sign the title over to you. If your Son balks about not getting any money for the vehicle remind him that you're doing him a favor and not letting his credit get damaged! That's payment enough! Hope that helps! Jim