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Among the far-reaching effects of Social Security reform on the rest of the economy is the impact on private pensions. This paper develops a model of pension plan design that incorporates heterogeneity in tastes for saving and sorting of workers in the labor market. The model is used to analyze the likely effects of a range of Social Security reform proposals on the design of employer-provided pensions. Several reform options are shown to change the relative benefits received by high- and low-income workers and to affect the ability of pension plan sponsors to comply with nondiscrimination rules for the distribution of pension contributions and benefits.