Regardless of whether you're already retired or just entering the workforce, there's a good likelihood that Social Security income will be a necessity, to some varied degree, during your retirement.

Every year for the past two decades, national pollster Gallup has surveyed both retired workers and future retirees to gauge how reliant they are, or expect to be (for future retirees), on Social Security to make ends meet. Since 2002, between 80% and 90% of surveyed retired workers have noted that their Social Security benefit represents a "major" or "minor" source of income. Similarly, between 76% and 88% of future retirees surveyed since 2001 anticipate leaning on America's top retirement program to help cover their expenses. 

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Source Fool.com