If you intend to work for income after you retire, you need to be aware of how your Social Security income may be taxed. In a recent AARP survey, thirty-seven percent of people indicated that they plan to work either full or part time during retirement. As indicated by Fidelity Investments, many older workers believe that working after retirement can supply valuable structure to their day and provide the mental stimulation that emerges from interacting with clients and co-workers. There are of course those who intend to work in retirement out of financial necessity.