Social Security is the largest retirement plan in the United States, providing important retirement income for workers, spouses, survivors, disabled individuals, and in some cases, children. And as a massive program, it's also a complex one, and many of the rules about Social Security aren't well understood.

With that in mind, here are three lesser-known Social Security rules that all future beneficiaries should be aware of, and why they're so important to know.

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Source Fool.com