Description: This article begins with an overview of how the tax treatment of partial exchanges has evolved over the last decade or so, including the concerns that led the Service to resist giving taxpayers carte blanche on such transactions.The new guidance shortens from 12 to six months the window following a partial exchange in which the transaction could be called into question, and simplifies the regime by de-linking it from the exceptions to the section 72q penalty tax.4 Finally, the guidance provides coordination with recent partial annuitization legislation and answers to other open issues. This article then summarizes Rev. Proc. 2011-38 and elaborates on why the features outlined above are important and helpful improvements over prior guidance.