Every year, millions of Americans rely on Social Security as a primary source of their retirement income. Unfortunately, given the complexities of the program, many are finding out that uninformed decisions made throughout the filing process, can prove costly over time. Whether retirement is around the corner or you have several years of work ahead, here are some common Social Security mistakes that you’ll want to avoid.

A recent survey conducted by PWC determined that 45% of American workers attribute money matters as their number one source of stress. That ranked higher than their jobs (20%), relationships (15%), and health concerns (15%), by a wide margin.

With its far-reaching effects, and controlling influence on other areas of life, it's no wonder that unresolved financial stress continues to be a leading cause of concern for many adults.

Imagine this: You’re a relatively healthy person. You eat right and exercise regularly -- perhaps you even run a few miles every other day to stay in shape. From the outside, you’re the picture of good health.

But at recent annual check-up, your family physician notices something on your chart that is alarming.

Often when it comes to Social Security the classic expression "I don't know what I don't know" is apropos. Most people leave a surprisingly large amount of money on the table by not claiming all the benefits to which they are entitled. Want a quick estimate of what's at stake for you?