The petitioner claimed that he was a trader in securities and had, in an earlier year, made a mark-to-market election. To do so, a Form 3115 must be attached to the return. However, IRS didn’t have any evidence from the petitioner that a Form 3115 had been filed and the petitioner could not prove his claim that he had filed one in an earlier year. The court held for the IRS that a valid mark-to-market election had not been made. Poppe v. Comr., T.C. Memo. 2015-205.