Is a partnership an entity for certain tax purposes or is it an aggregate of the partners? U.S. tax law was never consistent on this point. In 2017, a foreign taxpayer won a major victory when the U.S. Tax Court held that a partnership is an entity when determining the tax exposure of a foreign partner selling its partnership interest or having its interest redeemed. Almost immediately, Congress changed the law. From that moment, the I.R.S. reviewed the way partnerships and their partners are treated for purposes of the Subpart F, G.I.L.T.I., and P.F.I.C. provisions of U.S. tax law. Regulations were revised, the Schedule K-1 reporting form was modified with the addition of Schedule K-2 and Schedule K-3, and elections once made by domestic partnerships and binding on all members were now to be made by individual partners. Stanley C. Ruchelman and Wooyoung Lee explain these and other changes in the treatment of partnerships for the international provisions of U.S. tax law.