U.S. Social Security Administration, Office of Retirement and Disability Policy.

Distributional Effects of Increasing the Benefit Computation Period

 
Progressivity would not change
Year Scheduled Payable 38 years 40 years
1940 17.60% 17.70% 17.60% 17.60%
1945 17.50% 17.60% 17.60% 17.60%
1950 15.20% 15.30% 15.20% 15.20%
1955 14.80% 15.00% 14.70% 14.70%
1960 14.80% 15.20% 14.70% 14.60%
1965 14.90% 15.60% 14.80% 14.80%
1970 14.70% 15.60% 14.50% 14.50%
1975 15.10% 16.70% 14.90% 14.90%
1980 16.40% 18.70% 16.30% 16.30%
1985 18.40% 20.70% 18.30% 18.30%
1990 16.90% 18.80% 16.80% 16.70%
1995 16.80% 18.40% 16.70% 16.70%
2000 17.20% 18.40% 17.10% 17.10%
2005 16.90% 17.80% 16.80% 16.70%
2010 17.20% 17.80% 17.00% 17.00%
2015 17.60% 18.20% 17.50% 17.40%
2020 16.60% 17.10% 16.50% 16.40%
SOURCE: Author's calculations from MINT (Modeling Income in the Near Term) data.

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