Cantor Fitzgerald analyst Youssef Squali believes comments yesterday from the IRS's Office of Associate Chief Counsel regarding tax treatment of certain spinoffs bring a "cloud of uncertainty" around Yahoo's (YHOO) plans to hold a tax-free spinoff of its shares in Alibaba (BABA). Isaac Zimbalist, Senior Technician Reviewer at the IRS' Office Associate Chief Counsel, said that the agency will now hold in abeyance any ruling requests received with regard to spinoffs, according to Bloomberg. Squali reiterates a Buy rating on Yahoo, however, saying shares at $41 remain compelling. His analysis of varying tax treatments of Yahoo's Alibaba spin yields a $16 per share negative impact under a worst case scenario relative to his $60 fair value estimate. Yahoo closed yesterday down $3.38 to $40.98 after Zimbalist's comments brought a late day selloff.