Substantial Gainful Activity (SGA) describes work activity levels and income that the Social Security Administration (SSA) classifies as substantial and gainful. Gainful activity is work performed for pay, work of a nature generally performed for pay, or work intended for profit. Typically, an income of around $1,310 a month (as of 2021) for full-time work demonstrates SGA, though this numerical estimate does not apply to individuals who are blind.