How Common Is "Parking" Among Social Security Disability Insurance (SSDI) Beneficiaries? Evidence From The 1999 Change In The Level Of Substantial Gainful Activity (SGA)
Fewer Social Security Disability Insurance (DI) beneficiaries have their earnings suspended or terminated because of work than those who are actually working, partly because beneficiaries "Park" earnings at a level below Substantial Gainful Activity (SGA) to retain benefits. The authors assess the extent of parking by examining how beneficiary earnings and months off the rolls for work responded to a 1999 change in the SGA level for non-blind beneficiaries from $500 to $700 per month. Specifically, the difference-in-difference analysis compares longitudinal data for two beneficiary cohorts with different incentives to park their earnings; one experienced the increased SGA level the first year after its Trial Work Period (TWP), when beneficiaries can earn any amount without losing benefits, while the two-year-earlier cohort did not.