By the time you retire, there's a very good chance that you'll be reliant on Social Security income in some capacity. According to national pollster Gallup, 89% of non-retirees believe they'll need Social Security income to make ends meet. As for official data from the Social Security Administration (SSA), 62% of today's retirees lean on the program to supply at least half of their monthly income, while some 34% of retired workers effectively depend on Social Security for all (90%-100%) of their income.