Substantial gainful activity for 2014 is making $1,070 or more a month ( http://www.socialsecurity.gov/oact/COLA/sga.html ). So a disabled person can work 133 Hrs. per month at minimum wage ($8/hr). However once on SSD if they earn more than $770/month (96 hrs at $8/hr) they trigger a trial work period in which they can only make more than that for 9 months ( http://www.ssa.gov/OACT/cola/twp.html ).