Example. A owns all of the T stock. T owns 50 of the 100 shares of X stock. The other 50 shares of X stock are owned by corporation Y, which is unrelated to A, T, or P. On January 1 of Year 1, P makes a qualified stock purchase of T from A and makes a section 338 election for T. On December 1 of Year 1, P purchases the 50 shares of X stock held by Y. A qualified stock purchase of X is made on December 1 of Year 1, because the deemed purchase of 50 shares of X stock by new T because of the section 338 election for T and the actual purchase of 50 shares of X stock by P are treated as purchases made by one corporation. Section 338(h)(8). For purposes of determining whether those purchases occur within a 12-month acquisition period as required by section 338(d)(3), T is deemed to purchase its X stock on T's acquisition date, i.e., January 1 of Year 1.
Example.
26 C.F.R. §1.338-3