If I work after I start receiving Social Security retirement benefits, will I still need to pay Social Security and Medicare taxes on my earnings?
A. Yes. Any time you work in a job that is covered by Social Security–even if you are already receiving Social Security benefits–you and your employer must pay the Social Security and Medicare taxes on your earnings. The same is true if you are self-employed. You are still subject to the Social Security and Medicare taxes on your net profit.