From the Social Security Bulletin (emphasis added):
The Social Security Administration (SSA) rolled out the Ticket to Work (TTW) program between 2002 and 2004, with goals of expanding employment-related services for disability program beneficiaries and increasing program exits for work. Provider and beneficiary participation were initially low and the program did not measurably increase the extent to which beneficiaries achieved earnings sufficient to forgo benefits. In 2008, SSA revised the regulations in order to make participation more attractive to service providers, but the revisions also reduced provider incentives to help beneficiaries give up their benefits for work. Using administrative data from SSA, we find that provider and beneficiary participation increased substantially after the regulations changed, but the percentage of participants forgoing benefits for work declined. The extent to which that decline reflects the effects of the recession versus an increase in TTW program use by those with a relatively low chance of forgoing benefits for work remains unclear.