Here's a shocker: According to the Social Security Administration (SSA), "Social Security benefits represent about 30% of the income of the elderly." And for more than 10% of elderly beneficiaries, it provides a whopping 90% or more of their income.

Even if you're not in the last group, it's very likely that Social Security will provide a big chunk of your income in retirement. So it's important to learn about the program and make savvy decisions regarding it. Here are some mistakes to avoid.

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Source Fool.com