Social Security is a complex program that, as you might imagine, is loaded with different rules. And some of those rules are fairly well-known.

You might, for example, be aware that if you sign up for Social Security before having reached full retirement age (FRA), your monthly benefits will be permanently reduced. You may also be aware that if you delay your Social Security filing past FRA, you'll accrue delayed retirement credits up to a certain point that could boost your monthly benefits substantially.

But some of Social Security's rules may be a lot less obvious. Here are three that may not have hit your radar, but that you'll want to be aware of nonetheless.

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Source Fool.com