This Social Security Mistake Could Cost You an Arm and a Leg

Social Security benefits can be complicated and confusing, but it's important to have at least a general understanding of how they work. Because your monthly checks can make up a significant portion of your income in retirement, even small mistakes could be costly.

While you don't need to know everything about Social Security, there's one mistake the majority of older adults are making -- and it could have an enormous impact on your retirement.

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Source Fool.com