I am not a tax expert and I am sure I don't understand your situation completely but I don't know why you can't select the 'Financed by seller, Didn't received a 1098 form' option. Even though it is not a seller financed mortgage, you are paying interest on a loan that is used to either purchase or improve your primary home and the loan is secured by the home.
In order to claim the interest paid, the IRS needs to know who you paid it too. In your case, I assume it is the Peer-to-Peer managing company. When Turbo Tax asks for the seller's info, why not put in the P2P company's info? Is there a reason this can't be done because the P2P company is not technically the seller? Is there a tax expert out there willing to weigh in on this?
