Source: Harriet Edleson - US News

Knowing when to claim Social Security benefits can be an integral part of retirement planning. Though it may be just one source of income, it can be the most important one, partly because it can continue to grow larger until you reach age 70. It's also generally taxed at a lower rate than other sources of retirement income, says Virginia P. Reno, vice president for income security policy at the National Academy of Social Insurance, a Washington, D.C.-based research organization.

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