The Social Security Administration defines disability as the inability to do a “substantial gainful activity,” or SGA. SGA requires significant physical or mental activities, or a combination of both, while working either part-time or full-time. Generally, if an individual earns more than $1310 per month (unless they are blind) they are considered to be performing SGA. In order to meet the definition of being disabled, disability, your medical conditions must prevent you from performing work activities. “Gainful” means that the work can be done for pay or profit. There are two types of Social Security disability benefits: Supplementary Security Income, and Social Security Disability Insurance.