On June 17, 2009, the Seventh Circuit examined the tax practitioner privilege in Valero Energy Corporation v. U.S., 103 AFTR 2d 2009-2683. Valero, a large oil refiner, expanded its operations in 2001 by acquiring Ultra Diamond Shamrock Corporation (“UDS”). Prior to the acquisition, Ernst & Young developed a restructuring and refinancing plan for UDS’s Canadian subsidiaries. Valero asked its tax advisors, Arthur Anderson, to review the plan and provide additional tax advice.