Here is the Social Security website. This is also the page you want to see.
http://www.ssa.gov/retire2/whileworking.htmThis is a quote from the S/S website. Hope this helps.
"You can work while you receive Social Security retirement (or survivors) benefits. When you do, it could mean a higher benefit for you in the future. Higher benefits can be important to you later in life and increase the future benefit amounts your family and your survivors could receive.
While you are working, your earnings will reduce your benefit amount only until you reach your full retirement age.
We use a formula to determine how much your benefit must be reduced:
If you are under full retirement age for the entire year, we deduct $1 from your benefit payments for every $2 you earn above the annual limit.
For 2007 that limit is $12,960. In 2008 that limit will be $13,560.
In the year you reach full retirement age, we deduct $1 in benefits for every $3 you earn above a different limit, but we only count earnings before the month you reach your full retirement age.
If you will reach full retirement age in 2007, the limit on your earnings for the months before full retirement age is $34,440.
(If you were born in 1942, your full retirement age is 65 years and 10 months.)
If you will reach full retirement age in 2008, the limit on your earnings for the months before full retirement age is $36,120.
(If you were born in 1943, your full retirement age is 66 years.)
Starting with the month you reach full retirement age, you can get your benefits with no limit on your earnings.
If you are not already receiving benefits, be sure to contact us at the beginning of the year you reach full retirement age. Even if you are still working, you may be able to receive some or all of your benefits for the months before you reach full retirement age."