Your situation is complicated. a partnership return still has to be filed for the period it was a multimember LLC. from then on as a single member LLC he reports on his own schedule C. you want to change your accounting method for inventory. this requires the filing of form 3115. you didn't say whether or not your selling your interest or giving it away. either way presents certain tax issues for you and him including whether the partnership and him have to file asset acquisition statements TT does not do them. I strongly recommend the use of a pro
