Substantial Gainful Activity (SGA) is the amount of money that one can earn and still qualify for Social Security disability benefits. The amount is adjusted each year for inflation, as shown by this table. In 2022, the amount is $1,350. For 2023, the amount goes up to 1,470.
The SGA amount is important for two groups of people:
A person applying for disability benefits must have (or be expected to have) a period of 12 consecutive months with wages below SGA (subject, of course, to the rules for unsuccessful work attempts and Impairment Related Work Expenses).
A person receiving Title II disability benefits can earn up to the SGA amount and still receive benefits (be sure to also take a look at the trial work rules).