The Distributional Effects of the Social Security Windfall Elimination Provision
NBER Retirement Research Center Paper No. NB 08-05
Issued in September 2008
Millions of federal, state and local government employees have lifetime earnings that are divided between employment that is covered by the Social Security system and employment that is not covered. Because Social Security benefits are a non-linear function of covered lifetime earnings, the simple application of the standard benefit formula to covered earnings only would provide a higher replacement rate on those earnings than is appropriate given the individuals' total (covered plus uncovered) lifetime earnings. The Windfall Elimination Provision (WEP), established in 1983, is intended to correct this situation by applying a modified benefit formula to earnings of individuals with non-covered employment. This paper analyzes the distributional implications of the WEP, and finds that it reduces benefits disproportionately for households with lower lifetime covered earnings. It discusses an alternative method of calculating the WEP that preserves the intended redistribution of the system. In recognition of the data limitations that prevent this alternative method from being used by SSA for at least another decade, the paper also analyzes two alternative ways of calculating the WEP that use the same information that SSA currently uses, are budget neutral, and come closer to maintaining the cross-sectional progressivity of Social Security than does the existing WEP formula.
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