Social Security does not provide retirement income in a vacuum. Rather, commentators often refer to our national retirement income system as a three legged stool, with Social Security representing one of the legs and employer sponsored pension plans and individual savings representing the other two legs. Because changes in one leg of the stool are likely to have a direct impact on the other two legs, policymakers must not consider Social Security changes in isolation, but should take account of their effect on employer-sponsored pensions and individual savings. This Article analyzes how one of the most popular proposals, partial privatization, would likely affect private pensions. For purposes of this Article, partial privatization refers to proposals that direct part of Social Security's funding to individual accounts.