A: The Social Security Administration (SSA) says that you must not be able to perform “substantial gainful activity,” which means the type of activity a person normally does for pay or profit. If your monthly earnings are below a certain amount (which SSA sets every year), however, you will not be considered to be performing substantial gainful activity. If you are receiving disability benefits but wish to try working, you can take part in nine months’ worth of a work trial period, during which SSA will not stop your benefits if you are still disabled.