A trial work period (TWP) is a specific devise used by Social Security. It refers to the amount of time an individual can engage in work without being docked if the earnings exceed the set Substantial Gainful Activity (SGA) level. The TWA is frequently synonymous with the term "Grace Period." The length of the period is 9 months. It must fall within a rolling period of 60 months. The trial work period initiates only after the earnings determined by SGA are triggered. This is referred to as performing "services." During this time, a recipient may earn as much as possible without it interfering with their Social Security income. This applies to Supplemental Security Income (SSI) and Social Security Disability Insurance (SSDI). The rates of SGA are identical for both systems. The trial work period has the intent, when combined with other facets of the Social Security System for the disabled, of encouraging a return to the workforce. If, after the end of the 9 months of TWP, you continue to work above the SGA level, you will enter a new phase. This is called the Extended Period of Eligibility (EPE). To learn more about these terms, your rights and other related items, talk to a representative of Social Security, go to their website or contact a lawyer.