The current SGA level is $1000. This does not mean that everyone can work PT so long as they make under $1000, and SS will let them be. I'm not trying to discourage anyone from working, but SS can use PT work as evidence that your condition has improved and that you're capable of SGA. This has been discussed at length in the SSD forum. The closer you get to the SGA ceiling, the type of work you do, your impairment/s, all are contributing factors.

SGA=significant gainful activity.