Are social security programs progressive?

Social security programs generally seek to provide insurance and to reduce poverty and inequality. Providing insurance requires little redistribution. But reducing inequality and alleviating poverty do require redistribution. To reduce inequality, programs must redistribute income, but redistributing income is not the same as reducing inequality. While some programs redistribute large amounts of income without noticeably reducing inequality, others reduce inequality with less redistribution and fewer labor market distortions. A non-contributory tier, which provides benefits without requiring contributions, is a key component for reducing inequality.