How Working in Retirement Affects Your Social Security Benefit

"If you choose to continue working after claiming Social Security benefits, the earned income will not affect your benefits as long as you've reached full retirement age. If you have not yet hit full retirement age and you earn more than $15,120 from your job, you'll face Social Security benefit reductions. However, the withheld benefits will be factored into a monthly benefit recalculation once you reach your full retirement age." 
"For people who did file at 62 and regret the decision, the way to make up for that is to, if possible, go back to work and have your benefit withheld," says Elaine Floyd, director of retirement and life planning at Horsesmouth. "If you work and if your benefit is withheld, it will be recalculated at full retirement age to give you back the reduction that was deducted." Details at: http://money.usnews.com/money/retirement/articles/2013/04/15/how-working-in-retirement-affects-your-social-security-benefit